Strategic government planning will be crucial in addressing the ongoing supply/demand imbalance in Brisbane’s residential market, as new supply continues to lag.

That’s one of the conclusions from a new CBRE market analysis, which highlights positive fundamentals but ongoing challenges for both the Brisbane and broader South East Queensland residential market.

[smartcode_project:default project_id=136432 project_image_fid=5479]

While 5,600 apartments and townhouses are projected to be completed in Brisbane this year – up from an average of 3,500 in the five years to 2024 – CBRE Research Director Craig Godber said this figure had been somewhat inflated by project delays, which had shifted some anticipated 2024 completions into 2025.

Godber noted that recent completion levels were also well below the peak period in 2016 and 2017 when annual additions averaged around 12,500 units and townhouses.

“Brisbane's residential market is experiencing unprecedented growth, with demand outstripping supply," Godber said.

"Strategic planning by the State Government is crucial in addressing this imbalance and ensuring sustainable development."

Godber noted that low supply levels had translated into an extended period of low vacancy rates, with Brisbane’s metropolitan vacancy being at or below 1.5% since early 2021 and hitting 0.9% as at March this year.

These tight market conditions are evident across all city precincts.

[smartcode_project:default project_id=149098 project_image_fid=330588]

Looking ahead, adjusted additions between 2025 and 2029 are forecast at 23,200 dwellings, or 4,600 per annum, with 60% of these expected to be concentrated in Brisbane’s inner city.

“Brisbane’s low vacancy rate highlights the urgent need for additional residential supply and the forecasted growth in dwelling completions is a positive step towards meeting this demand,” Godber said.

[smartcode_project:default project_id=7574 project_image_fid=3770]

CBRE Metropolitan Investments Director Will Carman said Brisbane’s population expansion and strong demand fundamentals were driving interest in city development sites, but he noted that developer attitudes were shifting.

“As construction pricing continues to climb, developers are becoming more discerning. The focus has shifted toward delivering high-quality, well-located residential communities that can withstand market pressures and meet long-term demand,” Carman said.

He also noted the issue of affordability, with Brisbane’s median house price having crossed the $1 million mark.

“This reflects not only the city’s strong fundamentals and sustained demand, but also the growing challenge of affordability - particularly for first-home buyers. This price growth underscores the importance of strategic planning and quality development to meet evolving market expectations,” Carman said.

Developer focus shifts to high-quality, well-located residential communities that can withstand market pressures and meet long-term demand, new CBRE analysis shows

Joel Robinson

Challenges and opportunities in Brisbane’s residential market as supply lags

Not only is growth in Brisbane’s unit market lasting longer, it’s also getting stronger.

In August, unit values climbed a further 1.3 per cent, one of the strongest monthly results the Queensland capital has recorded in 2025, pushing the median unit value beyond $740,000, according to Cotality’s latest Home Value Index.

Over the rolling quarter, unit values surged 3.9 per cent, and are now 11.1 per cent higher year-to-date,&nbsp;making Brisbane the strongest-performing capital city unit market in the country.

The city’s apartment sector is also comfortably outpacing detached housing in 2025. House values rose 1.2 per cent in August to reach a median of $1.04 million, but quarterly growth was softer at 2.9 per cent, with an annual gain of just 7.3 per cent.

This widening divergence highlights the relative affordability of apartments and the intensifying demand for medium-density housing amid constrained supply,&nbsp;a trend reshaping Brisbane’s property market.

&nbsp;

<h2>What happened in Brisbane’s off the plan apartment market in August?</h2>

It was a busy month in Brisbane's off the plan property market, with new projects coming to the market, new projects and approved, and some hitting major construction milestones.

&nbsp;

Gold Coast developer <a href="https://www.apartments.com.au/developers/sherpa-property-group">Sherpa Property Group</a> revealed its debut Brisbane apartment development to the market, starting to take expressions of interest for&nbsp;<a href="https://www.apartments.com.au/new-apartments/symphony-south-brisbane-21-23-cordelia-street-south-brisbane-qld-4101">Symphony</a>&nbsp;in South Brisbane.&nbsp;

The 138-apartment development, part of Sherpa’s affordability-focused Flourish brand, is located near Fish Lane and aims to deliver quality homes at more accessible price points.&nbsp;

[smartcode_project:default project_id=7574 project_image_fid=3444]

Symphony’s one-, two-, and three-bedroom apartments will start from $655,000, with eligible first-home buyers benefiting from Queensland’s new stamp duty exemptions.&nbsp;

Over 1,400 sqm of communal amenity, including workspaces, rooftop pool, wellness centre, and private dining, will support a lifestyle-driven community.&nbsp;

Read more: <a href="https://www.apartments.com.au/news/qld/sherpa-opens-pre-release-for-debut-brisbane-apartment-development-symphony">Sherpa opens pre-release for debut Brisbane apartment development, Symphony</a>

Two new project launches in the same month is something Brisbane hasn’t seen in years. Joining Symphony at launch was <a href="https://www.apartments.com.au/new-apartments/banksii-east-brisbane-169-wellington-road-east-brisbane-qld-4169">BANKSII</a>, a 72-apartment development rising opposite Raymond Park in East Brisbane

To be developed by joint venture partners <a href="https://www.apartments.com.au/developers/core-property-partners">Core Property Partners</a> and <a href="https://www.apartments.com.au/developers/vector-property">Vector Property</a>, BANKSII has been designed by&nbsp;<a href="https://www.apartments.com.au/architects/mas-architecture-studio">MAS Architecture</a>&nbsp;to reinterpret and integrate the flow of the&nbsp;native Banksia flower into the architecture.

The rooftop will include a suite of wellness amenities including a pool, sauna, gym, and alfresco spaces.&nbsp;

[smartcode_project:default project_id=136432 project_image_fid=5476]

&nbsp;

With the Kangaroo Point Green Bridge, The Gabba, and Cross River Rail all within walking distance, BANKSII is poised to benefit from Olympic precinct investment in the lead-up to 2032.

Read more: <a href="https://www.apartments.com.au/news/qld/banksii-sales-launch-in-booming-east-brisbane-apartment-market">BANKSII sales launch in booming East Brisbane apartment market</a>

August saw major construction milestones achieved both in and out of the city.

<a href="https://www.apartments.com.au/developers/sekisui-house-australia" target="">Sekisui House</a>&nbsp;celebrated the completion of the Uno building at West Village, unveiling its largest apartments, up to 347 sqm internally, as part of <a href="https://www.apartments.com.au/new-apartments/the-allere-collection-west-village-mollison-street-west-end" target="">The Allere Collection</a>.&nbsp;

[smartcode_project:default project_id=114215 project_image_fid=5698]

Positioned in one of Brisbane’s most mature masterplanned precincts, the new residences target the undersupplied upper end of the market, offering rooftop gardens, pools, and pet-friendly amenities like the Paw Pavilion.&nbsp;

The Uno tower follows strong interest in its sold-out sister building Duo, due for completion in late 2025.

Read more: <a href="https://www.apartments.com.au/news/qld/sekisui-house-unveils-allere-unos-largest-apartments-as-building-completes">Sekisui House unveils Allere Uno's largest apartments as building completes</a>

At <a href="https://www.apartments.com.au/developments/rochedale-qld-4123">Rochedale</a> in Brisbane’s south, <a href="https://www.apartments.com.au/developers/metro-property-group">Metro Property Group</a> also marked a key construction milestone at Citrine Townhomes, with stage one now in the defects phase and full completion of all building works.&nbsp;

Stages one and two are fully sold out, while the recently launched stage three has just 10 four-bedroom homes remaining, priced from $1.125 million.&nbsp;

[smartcode_project:default project_id=136295 project_image_fid=2663]

Across the three stages, <a href="https://www.apartments.com.au/new-townhouses/citrine-townhomes-rochedale-311-gardner-road-rochedale-qld-4123">Citrine Townhomes</a> will deliver 90 three and four-bedroom homes with landscaped resident amenities, including a pool and BBQ area.&nbsp;

Settlements for stage one are expected to commence from October 2025.

Read more: <a href="https://www.apartments.com.au/news/qld/first-stage-of-townhouses-at-citrine-rochedale-reaches-completion-milestone">First stage of townhouses at Citrine Rochedale reaches completion milestone</a>

Builder-developer <a href="https://www.apartments.com.au/developers/mcnab-developments">McNab</a> is expected to launch its new West End project after receiving development approval from the Brisbane City Council in August.

The new development,&nbsp;<a href="https://www.urban.com.au/new-apartments/tannery-residences-439-montague-road-west-end-qld-4101">The Tannery Residences</a>, will see the historic Dixon's Tannery reimagined into a 10-level apartment building that will&nbsp;integrate the original 19th-century building into a resident wellness hub dubbed The Retreat, featuring a sauna, plunge pools, gym, Pilates studio, and co-working areas.&nbsp;

<img alt="McNab secures approval to transform West End's Dixon’s Tannery into The Tannery Residences" data-entity-type="" data-entity-uuid="" src="https://res.cloudinary.com/dz9xllyip/image/fetch/f_auto,c_limit,w_1440,q_auto/https://s3.ap-southeast-2.amazonaws.com/www.urban.com.au/s3fs-public/field/image/McNab%20The%20Tannery_Render_09.jpg?VersionId=Ucpd19J0ABOpzetZ.BsyYmS_x2N2QV_g" />

The 81 residences, ranging from two to four bedrooms, will be complemented by expansive rooftop amenities, including a pool, dog-friendly zones, and outdoor dining.&nbsp;

McNab plans to begin construction in Q3 2025, with completion expected by late 2027.

Read more: <a href="https://www.apartments.com.au/news/qld/mcnab-secures-approval-to-transform-west-ends-dixon-s-tannery-into-the-tannery-residences">McNab secures approval to transform West End's Dixon’s Tannery into The Tannery Residences</a>

&nbsp;

One of the largest applications the local council has seen in years hit the new apartment pipeline in August.

Verso Development filed plans for Toowong Central, a $1 billion precinct across three towers delivering 1,100 apartments to Brisbane’s undersupplied inner-west.&nbsp;

&nbsp;

&nbsp;

<img alt="$1 billion Toowong Central to deliver 1,100 apartments to undersupplied Brisbane market" data-entity-type="" data-entity-uuid="" src="https://res.cloudinary.com/dz9xllyip/image/fetch/f_auto,c_limit,w_1440,q_auto/https://s3.ap-southeast-2.amazonaws.com/www.urban.com.au/s3fs-public/field/image/architecture.png?VersionId=G7zTAAtY9Nj3muYKNSFxD_dzEWMqRn3X" />

Designed by <a href="https://www.apartments.com.au/architects/kerry-hill-architects">KHA</a>, the scheme includes short-term accommodation and a civic plaza, and aims to reclaim <a href="Toowong">Toowong</a>’s identity with subtropical urbanism and integrated public realm outcomes.

Read more: <a href="https://www.apartments.com.au/news/qld/1-billion-toowong-central-to-deliver-1-100-apartments-to-undersupplied-brisbane-market">$1 billion Toowong Central to deliver 1,100 apartments to undersupplied Brisbane market</a>

City Beat August 2025: Brisbane unit values surge again in August, as two new apartment developments launch to market

Summit &amp; Ridge, the fourth stage of Sekisui House Australia's Sanctuary in Wentworth Point, secured a flurry of sales at its recent launch.

More than 80 per cent of purchasers of&nbsp;<a href="https://www.apartments.com.au/new-apartments/summit-ridge-at-sanctuary-wentworth-point-14-16-hill-road-wentworth-point-nsw-2127">Summit &amp; Ridge</a>&nbsp;were owner occupiers, underlining the strong demand from buyers looking to live within the new&nbsp;riverfront community. Over 40 apartments were sold valued at $46.5 million within three hours of the launch event, with an average price of $1.107 million.

“Buyers appreciated the larger layouts in this stage and the sense of space Summit &amp; Ridge offers,"&nbsp;said Matthew Landa, Senior Sales Executive – Apartments &amp; Mixed-Use Developments.

"The combination of generous apartments, exclusive amenities and unique position on the Parramatta River peninsula helped with sales. Many told us they could picture themselves living here, it is a place that feels established, green and connected, yet private."

The launch drew interest from local buyers within a 5km radius, as well as repeat purchasers from previous Sanctuary stages, with 15 per cent of buyers upgrading their property portfolio through Sekisui House Australia’s Rewards Program. Purchasers also came from the Lower North Shore, Oatlands and the Inner West, highlighting the project’s broad market appeal.&nbsp;

<img alt="Summit &amp; Ridge at Sanctuary, Wentworth Point" data-entity-type="file" data-entity-uuid="1166d1aa-e075-429c-a1f4-4861cad140e3" src="https://s3.ap-southeast-2.amazonaws.com/www.urban.com.au/s3fs-public/inline-images/2417_TheSanctuary_02_EXT_Podium.jpg?VersionId=E37Ym7TBhQX4VFKnFNDwccSiDLp81KZA" />

Comprising 488 apartments across Summt (39 levels), and Ride (32 levels), the first sales release focused exclusively on one and two-bedroom residences, priced from $720,000 to $1.3 million. One-bedroom apartments were popular, with purchasers valuing their limited supply, pricing and uninterrupted views across the Newington Nature Reserve, Parramatta River and picturesque views across the Blue Mountains.

Summit &amp; Ridge enjoys an enviable position on the <a href="https://www.apartments.com.au/developments/wentworth-point-nsw-2127">Wentworth Point</a> peninsula, the only built environment north of Hill Road, surrounded by water and a nature reserve. The project’s Neighbourhood Green, a 1.5-hectare landscaped parkland running through the heart of Sanctuary will also open soon.

The towers by acclaimed architects <a href="https://www.apartments.com.au/architects/turner-studio">TURNER</a> are defined by organic, sculptural forms that frame views, guide movement and enhance the connection between nature and the city, a design approach that ensures Summit &amp; Ridge will become a striking architectural marker within Sydney’s skyline.

<img alt="Summit &amp; Ridge at Sanctuary, Wentworth Point" data-entity-type="file" data-entity-uuid="49e681c8-af8e-4623-aa60-7573acaade7e" src="https://s3.ap-southeast-2.amazonaws.com/www.urban.com.au/s3fs-public/inline-images/CGI1.png?VersionId=EkqjP9veHDeZaSeXkN8p1aOUW79nLdVv" />

Summit will feature resident-only amenities on level 29 including a resort-style pool and sauna, while Ridge offers an outdoor cinema, sunset bar and dining space on level 23. At the base of Ridge, a 110-place childcare centre will further support growing families, reinforcing the masterplan’s focus on lifestyle and community.

The interiors in the project by <a href="https://www.apartments.com.au/interior-designers/henderson-co">Henderson &amp; Co.</a>, were inspired by the “natural elegance” of Sanctuary’s landscape setting, with efficient Japanese design principles enhancing space and light throughout the homes. 
&nbsp; 
“The fact that sales were achieved so quickly shows the strength of demand for quality, well-designed apartments in Sydney,"&nbsp;Landa added.

"Owner occupiers in particular see the long-term value of being part of a master planned community delivered by Sekisui House Australia, and that trust has been a major driver behind this success."

Sales momentum was further supported by the current downward trend in interest rates, creating favourable conditions for buyers.

<img alt="Summit &amp; Ridge at Sanctuary, Wentworth Point" data-entity-type="file" data-entity-uuid="31591500-e65c-44d6-aa48-35310a7bd45b" src="https://s3.ap-southeast-2.amazonaws.com/www.urban.com.au/s3fs-public/inline-images/HERO_CASE%20STUDY%20A_1.jpg?VersionId=DiE.Zk1g8Rfb1fRmMMe_0r6oa55oYsAb" />

The recent completion of the third stage of Sanctuary, Laguna &amp; Glade,&nbsp;has further reinforced purchaser confidence, giving buyers a first-hand view of Sekisui House Australia’s build quality and design execution.

Nearby amenities include Marina Square Shopping Centre, Wentworth Point High School, ferry terminal, train station and the future Parramatta Light Rail.&nbsp;

Three and four-bedroom apartments will be released at future launches. &nbsp;Construction is anticipated to commence in Q4 2025 and completed by Q3 2028.

Every apartment in Summit &amp; Ridge will carry a 4 Gold Star iCIRT rating, an independent NSW Government-backed accreditation for integrity, capability and financial stability, giving buyers confidence they are investing in a home built to last.

[smartcode_project_cta:default project_id=144917]

Owner occupiers drive $46.5 million launch success at Summit & Ridge, Wentworth Point

Plans to transform the former VicRoads site in Kew are progressing with four shortlisted developers invited to submit their proposals for the site.

<a href="https://www.apartments.com.au/developers/riverlee">Riverlee</a>, <a href="https://www.apartments.com.au/developers/lendlease-development">Lendlease Development Pty Ltd</a>, <a href="https://www.apartments.com.au/developers/mirvac">Mirvac Group</a> and a <a href="https://www.apartments.com.au/developers/milieu-property">Milieu</a>-led consortium have been invited to participate in the Request for Proposal (RFP) process to deliver much needed housing at 60 Denmark Street, Kew.

Acting Executive General Manager Housing, Nemesia Kennett, said the RFP stage follows a strong response to the initial Expression of Interest (EOI) campaign.

"Denmark Street, Kew, presents a unique development opportunity which has attracted high caliber developers well qualified to transform the site,"&nbsp;Kennett said.

“Each shortlisted developer brings a depth of expertise and proven track record in delivering quality housing projects, achieving excellence in design and community outcomes. We’re looking forward to seeing the shortlisted developers' proposals and understanding how they will deliver the best outcomes for the community if successful."

Local views and priorities for the site were captured in a Community Aspirations Report that will guide the next stage of the development process.

"The report found overwhelming community support for redevelopment of the site and recognition of the urgent need for more homes in Kew,"&nbsp;Kennett added.

“Feedback also highlighted opportunities to revitalise public areas, improve walking and cycling connections, create more green open space, and celebrate the site's heritage, including its rail history and Wurundjeri cultural stories.”

Development Victoria will continue to communicate with the Boroondara Council and the local community throughout the transaction process.

A preferred development partner will be confirmed in 2026, following a thorough assessment of proposals.

Developers shortlisted to deliver housing in Kew

Builder-developer ALAND has drawn back the curtain on its first city-focused new apartment development.

The North Sydney development, <a href="https://www.apartments.com.au/new-apartments/the-walden-north-sydney-173-179-walker-street-north-sydney-nsw-2060">The Walden</a>, is the first time the company has ventured this close to the city, having previously completed thousands of apartments predominantly in Sydney's west, and more recently in Gosford.

<a href="https://www.apartments.com.au/developers/aland">ALAND</a> acquired the prime North Sydney site, spanning Walker and Hampden Streets just down the road from the Victoria Cross Metro station, for $240 million in June.

Now they've unveiled the new project, a mix of one-, two-, three- and four-bedroom apartments across a 30-level building designed by Rothelowman.

[smartcode_project:default project_id=134323 project_image_fid=6384]

The Walden will capitalise on the site’s front-row position on the eastern fringe of the <a href="https://www.apartments.com.au/developments/north-sydney-nsw-2060">North Sydney</a> CBD, which offers uninterrupted Sydney Harbour views stretching from the Sydney Harbour Bridge all the way to Sydney Heads.

The main tower will be flanked by a small four-level amenity building known as The Pavilion, offering exclusive resident-only amenities including a dedicated concierge service, a sauna and private wellness studio, a gymnasium and fitness studio, a resort-style rooftop pool and sundeck.

There will also be a&nbsp;residents’ lounge, private dining and a wine cellar, and co-working facilities with an on-site meeting room and boardroom.

&nbsp;

&nbsp;

[smartcode_project:default project_id=134323 project_image_fid=6382]

ALAND Founder Andrew Hrsto said the company knew they could create something "iconic" with The Walden when they saw the site.

&nbsp;

“As a company, we had been searching for a site in one of Sydney’s blue-chip locations, spanning the Eastern Suburbs, the Sydney CBD and the North Shore, and when we had the opportunity to purchase this site, we immediately recognised that it could be something iconic – being the last development with a view offering this exceptional.

“We identified the attributes and quality of the site as being perfectly aligned for ALAND – and we feel that this off-market acquisition is a perfect opportunity to showcase our craftmanship and expertise through a truly unique offering."

[smartcode_project:default project_id=134323 project_image_fid=6399]

Hrsto pointed to ALAND’s longstanding development expertise as a significant benefit in delivering a positive outcome for The Walden.

“Being a fully integrated development and construction business with a highly experienced team, we have the benefit of in-house experts across the development spectrum, from acquisitions, design, planning, and construction, to sales, marketing, property management, through to building management.

“As one of Australia’s largest private development and construction groups, we’ve been in operation for 23 years, with a Gold Star iCIRT rating and a 100 per cent delivery success rate across numerous masterplanned and mixed-use projects – and we’re very much looking forward to bringing this expertise to The Walden and contributing to the ongoing revitalisation of North Sydney."

The Walden is the latest development in Sydney to have the 10-year Latent Defects Insurance policy by Resilience Insurance, protecting buyers from any structural or waterproofing-related issues for 10 years post-completion.&nbsp;

Demolition of existing structures on The Walden site has already commenced through specialist civil contractor Moits, with the aim of completing preparatory ground works by the end of 2025, ahead of construction commencement in early 2026.

[smartcode_project_cta:default project_id=134323]

ALAND unveils The Walden, North Sydney's latest luxury apartment development

Sea Level

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Over the past two weeks, storms pummelling the New South Wales coast have left beachfront homes at Wamberal on the verge of collapse. It’s stark proof of the risks climate change and sea level rise pose to coastal areas.
Our new research published today puts a potential price on the future destruction. Coastal land affected by flooding – including high tides and extreme seas – could increase by 48% by 2100. Exposed human population and assets are also estimated to increase by about half in that time.
Under a scenario of high greenhouse gas emissions and no flood defences, the cost of asset damage could equate up to 20% of the global economy in 2100.
Without a dramatic reduction in greenhouse gas emissions, or a huge investment in sea walls and other structures, it’s clear coastal erosion will devastate the global economy and much of the world’s population.
In Australia, we predict the areas to be worst-affected by flooding are concentrated in the north and northeast of the continent, including around Darwin and Townsville.
<img src="https://images.theconversation.com/files/350326/original/file-20200730-23-rmfjij.jpg?ixlib=rb-1.1.0&amp;q=45&amp;auto=format&amp;w=754&amp;fit=clip" alt="Man cleans up after Townsville flood"> 
A clean-up after flooding last year in Townsville, an Australian city highly exposed to future sea level rise. Dan Peled/AAP
<h2>Our exposed coasts</h2>
Sea levels are rising at an increasing rate for <a href="https://oceanservice.noaa.gov/facts/sealevel" target="_blank">two main reasons</a>. As global temperatures increase, glaciers and ice sheets melt. At the same time, the oceans absorb heat from the atmosphere, causing the water to expand. Seas are rising by about 3-4 millimetres a year and the rate is <a href="https://www.ipcc.ch/srocc/" target="_blank">expected</a> to accelerate.
These higher sea levels, combined with potentially more extreme weather under climate change, will bring damaging flooding to coasts. Our study set out to determine the extent of flooding, how many people this would affect and the economic damage caused.
We combined data on global sea levels during extreme storms with projections of sea level rises under moderate and high-end greenhouse gas emission scenarios. We used the data to model extreme sea levels that may occur by 2100.
We combined this model with topographic data (showing the shape and features of the land surface) to identify areas at risk of coastal flooding. We then estimated the population and assets at risk from flooding, using data on global population distribution and gross domestic product in affected areas.
<img src="https://images.theconversation.com/files/350322/original/file-20200730-29-eqrhbr.jpg?ixlib=rb-1.1.0&amp;q=45&amp;auto=format&amp;w=754&amp;fit=clip" alt="Homes at Collaroy in Sydney damaged by storm surge">
Many coastal homes, such as these at Sydney’s Collaroy beach, are exposed to storm surge damage. David Moir/AAP
<h2>Alarming findings</h2>
So what did we find? One outstanding result is that due to sea level rise, what is now considered a once-a-century extreme sea level event could occur as frequently as every ten years or less for most coastal locations.
Under a scenario of high greenhouse gas emissions and assuming no flood defences, such as sea walls, we estimate that the land area affected by coastal flooding could increase by 48% by 2100.
This could mean by 2100, the global population exposed to coastal flooding could be up to 287 million (4.1% of the world’s population).
Under the same scenario, coastal assets such as buildings, roads and other infrastructure worth up to US$14.2 trillion (A$19.82 trillion) could be threatened by flooding.
This equates to 20% of global gross domestic product (GDP) in 2100. However this worst-case scenario assumes no flood defences are in place globally. This is unlikely, as sea walls and other structures have already been built in some coastal locations.
In Australia, areas where coastal flooding might be extensive include the Northern Territory, and the northern coasts of Queensland and Western Australia.
Elsewhere, extensive coastal flooding is also projected in: - southeast China - Bangladesh, and India’s states of West Bengal and Gujurat - US states of North Carolina, Virginia and Maryland - northwest Europe including the UK, northern France and northern Germany.
<img src="https://images.theconversation.com/files/350319/original/file-20200730-35-19xjvnc.jpg?ixlib=rb-1.1.0&amp;q=45&amp;auto=format&amp;w=754&amp;fit=clip" alt="A woman struggles through floodwaters in Bangladesh">Bangladesh is among the nations most exposed to coastal flooding this century. SOPA
<h2>Keeping the sea at bay</h2>
Our large-scale global analysis has some limitations, and our results at specific locations might differ from local findings. But we believe our analysis provides a basis for more detailed investigations of climate change impacts at the most vulnerable coastal locations.
It’s clear the world must ramp up measures to adapt to coastal flooding and offset associated social and economic impacts.
This adaptation will include building and enhancing coastal protection structures such as dykes or sea walls. It will also include coastal retreat – allowing low-lying coastal areas to flood, and moving human development inland to safer ground. It will also require deploying coastal warning systems and increasing flooding preparedness of coastal communities. This will require careful long-term planning.
All this might seem challenging – and it is. But done correctly, <a href="https://www.propertyobserver.com.au/https://www.pnas.org/content/111/9/3292" target="_blank">coastal adaptation</a> can protect hundreds of millions of people and save the global economy billions of dollars this century.
<a href="https://theconversation.com/profiles/ebru-kirezci-1140869" target="_blank">Ebru Kirezci</a>, PhD candidate, <a href="https://theconversation.com/institutions/university-of-melbourne-722" target="_blank">University of Melbourne</a> and <a href="https://theconversation.com/profiles/ian-young-807759" target="_blank">Ian Young</a>, Kernot Professor of Engineering, <a href="https://theconversation.com/institutions/university-of-melbourne-722" target="_blank">University of Melbourne</a>
This article is republished from <a href="https://theconversation.com" target="_blank">The Conversation</a> under a Creative Commons license. Read the <a href="https://theconversation.com/unwelcome-sea-change-new-research-finds-coastal-flooding-may-cost-up-to-20-of-global-economy-by-2100-143599" target="_blank">original article</a>.
</body></html>

j.ballantyne1990-6AQqhLzZaK

Research finds coastal flooding may cost up to 20% of global economy by 2100

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GUEST OBSERVER
You may have seen recent maps showing how sea level rise may effect coastlines worldwide, including Australian cities. These maps have been produced by US-based website Climate Central.
For instance the video shows what they forecast sea level rise would be like in Melbourne with 4℃ and 2℃ of warming. This is not necessarily sea level rise that will occur over the coming century, but the eventual sea level locked in under particular temperature scenarios. It could take under 200 years or up to 2,000 for sea levels to reach these levels.
The picture isn’t pretty.
Maps such as these have triggered heated debate and discussion in different places in Australia (for instance Eurobodalla and Batemans Bay in New South Wales ) as individuals and organisations wrestled with the implications for property values, policy, long term planning and future risk management of our coastlines.
So is it time to sell up?
Coasts are always changing
This mapping helps us realise that coastlines are not static like property boundaries. They are in fact incredibly dynamic and continue to adjust to changes in sea level. The ambulatory nature of coastlines is a point worth remembering.
It is incredibly important to emphasise that the geomorphological, geological, ecological (i.e. dunes or reefs), or built characteristics of your local coastal environment have a huge influence on how coastlines respond to changing sea levels.
In some places beaches are advancing due to an excess in sand supply, while in other places a lack of sand means a coastline can recede (such as Old Bar on the mid-north coast of New South Wales). Furthermore, coral islands in the Pacific are now known to be dynamic in how they change shape and form in response to rising seas.
The rate of sea level rise is important in this regard. The point is, these maps cannot be taken at face value because they mask locally relevant environmental processes that will impact how sea level rise is experienced at any one place.
How are communities adapting to sea level rise?
In countries like Australia local and regional governments are doing more robust local studies forecasting sea level rise and coastal change. Good examples are the projects Mapping and responding to coastal inundation - undertaken jointly by the Sydney Coastal Councils Group and the CSIRO; and Coastal Vulnerability to Multiple Inundation Sources (COVERMAR) - a partnership between the Sydney Coastal Councils Group and the University of Sydney. Such efforts are much more useful for responding to the threats of sea level rise.
Recently proposed changes to policy and legislation in NSW make explicit the need to consider climate change and the risks it poses to our way of life. The proposed Coastal Management Act goes further and makes explicit mention of the risks posed by extreme storm events (compounded by rising sea levels) to our built environment and life.
The need for local information
Broad-scale maps such as these provide a visceral link between a warmer and wetter world, which can provide the general public with a broad educational tool to help them visualise and grasp what sea level change might look like in their local area.
They are useful for initiating local conversations in communities about the possible locations of critical infrastructure (e.g. nuclear power stations at coastlines) that will have life spans running to hundreds of years or even longer.
But to actually plan for sea level rise we need good, local information. In NSW decisions about coastal management are made mostly by local government. These decisions come about after a detailed study of the local coastal processes and environment, and the values placed on the coastal environment (e.g. property, recreation, aesthetics etc.).
Using a risk-based approach to coastal management and planning will help ensure that new high value development (e.g. infrastructure, power stations etc.) is not placed in areas exposed to rising seas.
The problem is existing development in areas now known to be hazardous with the most comprehensive analyses being presented in the National Coastal Risk Assessment  published by the Commonwealth Department of the Environment. A risk-based planning process should seek to avoid repeating those mistakes, but also allow for continued use of those areas until such time as it is unsafe.
Evaluating and making decisions about those risks is incredibly difficult and fraught with complexity (coastal evolution is the result of multiple factors), ambiguity (whose values matter?) and uncertainty (what really will happen in 100 years?). Having said that, coastal planners all over Australia (and around the world for that matter) are grappling with these issues. But, we still have a very long way to go.
Filippo Dall'Osso is researcher at the Natural Hazards Research Group, University of Sydney and can be contacted <a href="https://theconversation.com/profiles/filippo-dallosso-206055" target="_blank">here</a>.
Dale Dominey-Howes is associate professor in Natural Disaster Geography, University of Sydney and can be contacted <a href="https://theconversation.com/profiles/dale-dominey-howes-112724" target="_blank">here</a>.
Tom FitzGerald is PhD candidate in coastal hazard risk management, University of Sydney and can be contacted <a href="https://theconversation.com/profiles/tom-fitzgerald-17927" target="_blank">here</a>.
All are authors for The Conversation.
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