If your decision notice includes a condition about land contamination, you cannot usually start — or occupy — the development until it is discharged. This guide explains who needs a contaminated land assessment for planning, what the condition means, and how to deal with it.
The contaminated land planning condition
Local planning authorities routinely attach a contaminated land condition to consents, especially for sensitive end uses. A typical condition requires a Preliminary Risk Assessment (Phase 1), and if that identifies potential risks, a site investigation (Phase 2), a remediation scheme if needed, and a verification report — each to be approved in writing before the relevant stage.
Who usually needs one
- Residential development, particularly with gardens and soft landscaping.
- Schools, nurseries, play areas and allotments.
- Brownfield, former industrial, commercial or agricultural sites.
- Sites near former landfills, petrol stations, works or made ground.
- Any site where the authority has reason to suspect contamination.
How to discharge the condition
The route depends on what the evidence shows. In many cases a robust Phase 1 Preliminary Risk Assessment is enough to satisfy the authority that risks are low and no further work is required, allowing the condition to be discharged. Where potential pollutant linkages are identified, a phased approach follows: Phase 2 investigation, then remediation and verification if necessary.
Why the condition is worth taking seriously
Pre-commencement contamination conditions are a frequent cause of delay. Starting work before a condition is discharged can leave a development technically unlawful and difficult to sell or mortgage, because solicitors and lenders check that conditions have been formally cleared. Dealing with it early, proportionately and with the right evidence avoids that.
Read next: Phase 1 vs Phase 2 — what happens next, or get a fixed-fee quote.
FAQs
Can I discharge a contamination condition with just a Phase 1?
Often, yes — if the Phase 1 Preliminary Risk Assessment demonstrates that significant pollutant linkages are unlikely, many authorities will discharge the condition without intrusive investigation.
What happens if I ignore the condition?
Building out a development without discharging a pre-commencement condition can make the whole development unauthorised and cause serious problems on sale or refinancing, so it should not be left unresolved.
Not sure which report your site needs?
Send us the postcode and a line about your project — we'll tell you exactly what's required, with a fixed-fee quote, usually within a working day.
Get a quoteTell us about your site
Send us your location and plans for a fast, fixed-fee quote — and honest advice on exactly which reports you do and don't need.