Is no planning permission for extension a reason to pull out of a purchase?

Not automatically. No planning permission for extension severity ranges from cosmetic to deal-breaker. Pull out only if the cost to remediate exceeds the renegotiation headroom the seller will accept, if your lender refuses to lend on the property, or if a specialist report confirms an active, worsening defect. Most buyers renegotiate rather than walk; a written quote from a local trade is the strongest evidence to use.

Survey finding

Unauthorised extension on your survey: what to do

Needs attention

Missing planning is a serious finding. This page covers the resolution paths.

Last updated: 6 May 2026. Editorially reviewed: 20 May 2026.

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Common findings

Finding

No planning permission for extension

Needs attention

What this usually means

Some extensions don't need planning permission under permitted development rights. Where they do but lack it, enforcement is possible up to 4 years post-completion (extensions) or 10 years (change of use). After that, a Certificate of Lawfulness can be applied for.

Why it matters

Lender will not lend without resolution. Indemnity is sometimes acceptable; certificate of lawfulness is preferred.

Ask your surveyor

Check:What works appear to lack planning?
Check:Are they likely under permitted development?

Ask the seller

Check:Was planning permission applied for?
Check:When were the works completed?

Next steps

•Get two written quotes from local trades before negotiating with the seller.
•Speak to your mortgage broker before exchanging if the finding affects mortgageability.

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What you need to know

Severity

3/ 5

Significant. Specialist follow-up usually warranted before exchange.

Typical cost to fix

Certificate of Lawfulness application £200-£500. Retrospective planning application £200-£500 plus consultancy £1,000-£3,000. Indemnity insurance £200-£500.

Mortgage impact

Resolution required before drawdown in most cases.

Insurance impact

Standard if resolved.

When to pull out

Pull out if works are recent, major, and seller refuses to apply for retrospective permission or certificate of lawfulness.

When to renegotiate, and by how much

Resolution costs plus risk premium; typical £500-£3,000 reduction.

Thinking of pulling out or renegotiating? What to do after a bad survey

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How MyPropertyScan produces this guide, and what it is not

Published by MyPropertyScan and written by Ziad Nasr, who is accountable for its accuracy. No page here is written or reviewed by a chartered surveyor, conveyancer or regulated adviser, and we do not claim otherwise.

This page is not:

Chartered surveying — we do not inspect properties or produce RICS Home Survey reports
Legal advice — we do not act as conveyancers or advise on title, tenure or contracts
Mortgage or insurance advice — we are not regulated by the FCA and give no recommendations

Figures and process steps come from the published UK datasets and standards listed on this page, not from professional practice. Pages are updated when source coverage, survey cost assumptions, or lender and legal requirements materially change. Dataset limitations are set out on the methodology page.

Spotted something out of date or wrong? Email hello@mypropertyscan.com and we will correct it and change the update date.

Sources used

We use UK public and specialist sources where they are available. Public datasets can be incomplete, delayed, or missing for some addresses. Treat them as a starting point, not as a replacement for professional advice.

Source standard: preference goes to official government datasets, statutory bodies, professional standards, and primary dataset publishers. We cite the source family on the page and explain coverage limits rather than filling gaps with unsupported estimates.

Professional standard: RICS Home Survey StandardRICS standard for condition-based residential surveys in the UK.
Learn more from: RICS consumer guide to surveysConsumer-facing guide to survey types and when each level is appropriate.
Official guidance: GOV.UK buying or selling your homeGovernment overview of the home buying and selling process.