Do I Need a Party Wall Surveyor? (60-Second Answer)

You need a party wall surveyor if — and only if — your works are notifiable under the Party Wall etc. Act 1996 AND your neighbour either dissents or fails to respond within 14 days. Here's how to work out both parts in a minute.

Step 1: Are your works notifiable?

Three sections of the Act trigger a notice.

Section 1 — Line of junction. Building a new wall on or up to the boundary. Common on side-return extensions and new-build infill plots.

Section 2 — Works to an existing party wall. Cutting into it, raising it, underpinning it, exposing it, cutting away projections, inserting a beam. This is the section that catches almost every loft conversion (steel beams into the shared wall) and every chimney breast removal.

Section 6 — Excavation near a neighbour's foundations. Digging within 3 metres of a neighbouring structure to a depth lower than their foundations, OR within 6 metres if the excavation would cut a 45° line down from their foundations. This catches almost every rear extension on a terrace or semi.

If your project fits any of the above, notice is legally required. Full stop.

Step 2: Do you need a surveyor?

You always need to serve a notice if works are notifiable. You only need a surveyor if your neighbour dissents or doesn't respond within 14 days. In real life, that's about 60–70% of cases.

The projects that almost always need one

• Loft conversion with steel beams (99% of them)
• Rear extension with strip or trench-fill foundations
• Side-return extension on a terraced house
• Basement or lower-ground dig
• Chimney breast removal
• New boundary wall or garage on the boundary line
• Underpinning

The projects that usually don't

• Internal reconfiguration with no work to shared walls
• Rear extension where you have no adjoining neighbour within 6 metres
• Detached house with no shared walls and no excavation near any boundary
• Roof tile replacement, rendering, painting
• Fitting shelves, kitchens, bathrooms

What happens if you skip it

If notifiable works go ahead without a valid notice, the adjoining owner can seek an injunction to stop the work — even if it's already started. Courts routinely grant them. Your builder walks off site, you pay to make good any partial works, and you still have to serve the notice properly and wait out the statutory period before restarting. It's the most expensive way to save £50.

The fastest way to know

Our free 60-second checker asks eight plain-English questions and tells you exactly which notices (if any) your project needs — no email required to see the answer.

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