Guidance for Property Buyers in Areas Susceptible to Climate Risk

As climate risks become more integrated into property transactions, buyers in higher-risk locations — those susceptible to heat stress, drought, and wildfires — need to take extra precautions before purchasing a home. Here are some scenarios that could happen and some practical guidance for buyers navigating these risks.

 Case Study 1: Heat Stress in Urban Areas (London)

Scenario:

• A couple purchased a top-floor flat in central London in 2022.
• During the 2022 heatwave (40.3°C recorded in the UK), their flat became uninhabitable for several hours a day due to poor insulation and lack of cooling infrastructure.
• They later discovered that the urban heat island (UHI) effect made their location 5–7°C hotter than surrounding rural areas.

Impact:

• The flat’s resale value potentially drops, as buyers become more aware of extreme heat risks.
• The cost of retrofitting cooling systems, reflective windows, and insulation is over £10,000.
• Insurance costs could increase due to higher overheating risks.

Buyer Guidance:

• Check the property orientation—south- and west-facing homes heat up more.
• Look for cooling infrastructure—shaded areas, ventilation, reflective roofs, and green spaces.
• Assess insulation—well-insulated homes are not just for winter; they also help keep homes cool.

Case Study 2: Drought & Subsidence Risks (Essex & London Clay Belt)

Scenario:

• A buyer purchased a 1930s semi-detached home in Essex, an area prone to shrink-swell subsidence due to clay-heavy soil.
• During the 2022 drought, cracks began forming in the walls and floors due to soil shrinkage.
• The buyer later discovered that a climate risk search was not conducted, and the home had a history of subsidence claims.

Impact:

• Repair costs reaching £50,000, including foundation work.
• Potential mortgage & insurance difficulties—higher premiums and excess fees can be triggered due to subsidence risk.
• Lower potential resale value as future buyers factor in repair risks.

Buyer Guidance:

• Request a subsidence check if buying in clay-rich areas (London, Kent, Essex, Midlands).
• Look for tree proximity—large trees near foundations increase soil drying and subsidence risk.
• Check insurance history—previous claims for subsidence can indicate high future risk.
• Monitor water restrictions—drought-prone areas may limit water use, affecting gardens and utilities.

Case Study 3: Wildfire Risks in Rural & Heathland Areas (Surrey & Dorset)

Scenario:

• A family bought a cottage near Surrey heathlands in 2021, drawn by its proximity to nature.
• During the 2022 wildfire season, fires spread rapidly through dry heathland, threatening homes in the area.
• The family later discovered that their property was within a designated high-risk wildfire zone but was never informed by the seller or conveyancer.

Impact:

• Could experience rising insurance premiums—fire cover could become significantly more expensive.
• Mortgage lenders may require additional fire-resistant modifications (e.g., defensible space around the home).
• Property could be devalued due to increased fire risk concerns.

Buyer Guidance:

• Check wildfire risk maps—certain areas (e.g., Surrey, Dorset, Peak District) are more prone to wildfires.
• Look for fire safety measures—fire-resistant landscaping, safe access routes, and defensible space.
• Ask about local fire response times—rural properties may be further from fire services, increasing risk.

Key Takeaways for Buyers in High-Risk Areas

• Request a Climate Risk Report—before purchasing, obtain an environmental search covering heat, drought, and wildfire risks.
• Factor in any Future Insurance & Mortgage Costs—properties in high-risk areas may have higher premiums or mortgage restrictions.
• Assess Adaptation Potential—consider whether climate resilience upgrades (cooling systems, water-saving features, fireproofing) are possible. This could be a negotiation point for those who can see real value in, or desirability of, the property in question.
• Understand Local Planning Rules—some councils are restricting new developments in areas with extreme climate risks.

Our Climate Risk products provide insight into climate impact on property. Contact us to find out more and find out how to access our products.

References and Further Reading:

https://www.researchgate.net/publication/375094516_Mitigating_Overheating_Risks_for_Modern_Flats_in_London_Due_to_Climate_Change
https://assets.publishing.service.gov.uk/media/67a08e731d14e76535afb6b2/CS-N0W_Assessing_future_heating_and_cooling_needs_of_UK_housing.pdf
https://www.theguardian.com/environment/2025/apr/16/uk-homes-overheating-soars-study?
https://www.insurancebusinessmag.com/uk/news/catastrophe/uk-wildfire-risks-key-insights-every-broker-should-know-531861.aspx
https://ansons.law/fire-safety-considerations-buying-home/
https://pmc.ncbi.nlm.nih.gov/articles/PMC4874416/
https://www.hsbc.co.uk/mortgages/could-climate-change-impact-your-mortgage-application/
https://www.mortgageable.co.uk/mortgages/challenges-of-buying-a-house-with-subsidence/
https://www.cambridge.gov.uk/media/11676/retrofitting-your-home-report.pdf