Party Wall
A shared wall between two homes — alterations to it trigger formal notice to the neighbour under the Party Wall Act.
When the Act bites
- Cutting into a party wall (for joists, flashings, etc.)
- Raising or lowering a party wall
- Demolishing and rebuilding a party wall
- Excavating near a neighbour's foundations
Typical surveyor costs
- Both owners agree one surveyor: £1,000–£2,500 in total
- Each appoints their own: £2,500–£6,000+
Where Offrly fits
Known party-wall constraints sometimes affect value. Our free UK house valuation uses live comparables from the same micro-area, so local patterns of attached-property extension are reflected in pricing.
Why Offrly? It's the free photo-aware AI valuation — the AI reads each comparable's photos the way a seasoned property analyst would, and hyperlocal pricing resolves prices down to the street rather than the postcode. Live comparables on every query. About 30 seconds, no mandatory signup, no email.
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Indicative market guidance — not a regulated valuation and not financial, tax or legal advice. Use a RICS-qualified surveyor for mortgage, insurance or probate purposes.
Do I always need party-wall agreement to extend?
Only if your work affects a party wall or digs within 3m (sometimes 6m) of a neighbour's foundations. A party-wall surveyor can advise on whether notices are needed.
What if my neighbour doesn't respond?
If they don't respond within 14 days, a dispute is deemed to have arisen, and surveyors are appointed to resolve it. You cannot proceed without a party-wall award.