Contaminated land: protect yourself from risk
A contaminated land indemnity policy is a crucial safeguard for home buyers, developers and lenders concerned about historical contamination. Such contamination can have serious financial, legal, and environmental consequences, making indemnity insurance an essential risk management tool.
What is a contaminated land indemnity policy?
A contaminated land indemnity policy is an insurance product designed to protect the current owner, developers, and mortgage lenders from financial losses associated with polluted land. It provides the cover required in case of a regulatory enforcing authority issuing a remediation notice to remediate contaminated land under environmental laws.
In the UK, under the Environmental Protection Act 1990 (Part IIA), local authorities have the power to identify contaminated land and require remediation. If contamination is found, liability can fall on the current property owner, even if they were not responsible for the pollution. Contaminated land indemnity insurance shields property stakeholders from these potentially costly liabilities.

How to assess contaminated land
If land is suspected to be contaminated in any way, a contaminated land risk assessment is likely to be needed. Geo-environmental consultants will carry out an environmental search to check for current and historic contamination; the assessment involves inspecting for a range of potential issues from contaminated soil and ground gases to invasive plants such as Japanese knotweed. The final environmental report will fully evaluate the risk of significant harm.
The risks posed by contaminated land
Contaminated land presents a range of risks, impacting both human health and the environment. The presence of hazardous substances such as heavy metals, hydrocarbons, asbestos, or industrial chemicals can lead to the potential risk of significant harm.
1. Human health risks
- Exposure to toxic substances: Contaminants such as lead, arsenic, and radioactive substances can pose significant health hazards.
- Air and water contamination: Toxins can leach into groundwater or release harmful vapours, increasing exposure risks.
- Soil contamination: Pollutants in the soil can affect food crops and natural ecosystems.
2. Environmental risks
- Water pollution: Contaminants can seep into rivers, lakes, and underground water supplies, affecting aquatic life and drinking water.
- Biodiversity loss: Polluted land can destroy habitats and disrupt ecosystems.
- Legal liabilities: Landowners may be forced to fund environmental clean-up efforts, which can be extremely expensive.
Why take out a contaminated land indemnity policy?
There are several key reasons why property buyers and developers take out a contaminated land indemnity policy:
- Protection against clean-up costs – Remediation can cost thousands or even millions of pounds. An indemnity policy covers these expenses.
- Mortgage and lending requirements – Lenders often require indemnity insurance before approving financing for a property.
- Legal compliance – Owners are legally responsible for contamination under environmental laws; if they knowingly permitted contamination to create risk of significant harm they could be left financially exposed. Indemnity insurance would mitigate this risk.
- Property saleability – Future buyers may be deterred by contamination risks; an indemnity policy reassures potential purchasers.
- Avoiding planning delays – Contamination concerns can delay or prevent planning approvals: a policy can provide confidence to local authorities.
Who provides contaminated land indemnity policies?
Several of the leading major insurance providers offer contaminated land indemnity insurance policies in the UK, including insurers specialising in environmental risk. Policies are typically arranged through specialist brokers who understand environmental risk management and legal requirements.
What does a contaminated land indemnity policy cover?
Generally, a contaminated land indemnity policy protects against:
- Remediation costs: Covering the expenses required to clean up contaminated land.
- Legal defence costs: If legal action is taken due to land contamination.
- Loss in property value: Compensation for depreciation caused by contamination issues.
- Third-party claims: Protection against claims from neighbours or regulatory bodies due to environmental damage.
How long does a contaminated land policy last?
Contaminated land indemnity policies typically offer long-term protection, often covering the insured party for up to 30 years. Some policies provide indefinite cover, lasting for the duration of property ownership.
How much does a contaminated land indemnity policy cost?
The cost of a contaminated land policy varies according to the underwriting team involved and several factors including:
- The level of contamination risk.
- The size and location of the property.
- The required indemnity limit.
- The insurance provider.
Typical costs for indemnity insurance:
For residential properties, policies typically range between £250 and £1,000. For commercial properties or high-risk sites, premiums can be significantly higher, often between £2,000 and £10,000+.
Fully assess risks on contaminated land
To arm yourself with the relevant information about contamination on a site, it might be prudent to obtain a contaminated land risk assessment. This will enable you to decide whether taking out a contaminated land indemnity policy is your preferred option.
Given the risks posed by land contamination to both human health and the environment, securing indemnity cover ensures peace of mind and financial security, for owners, developers, and investors alike.
The team of geo-environmental consultants at Arbtech are experienced in conducting contaminated land risk assessments UK-wide. For further information, fill in the quick contact form at the top of this page.