Party Wall Agreement: a complete 2026 guide

A “party wall agreement” is the everyday name for the legally binding document that ends the formal dispute process under the Party Wall etc. Act 1996. Surveyors call it the Party Wall Award. The two terms mean the same thing.

1. What a party wall agreement actually does

The agreement does three jobs. It fixes the scope of works — what the building owner can do to the wall and when. It sets out protections for the adjoining owner — working hours, dust, vibration, weatherproofing, access. And it allocates cost and liability if something goes wrong: who pays the surveyor, who pays for damage, and how disputes are resolved.

It is signed by the appointed surveyor or surveyors. Once served on both owners, works can lawfully proceed.

2. When do you need one?

You need an agreement whenever your works are notifiable under the Act and the adjoining owner does not consent in writing within 14 days of receiving your notice. In practice, that covers the bulk of London loft conversions, rear extensions, and basements.

Use the notice checker for a 30-second indicative answer.

3. Agreement vs Award — same thing, different audience

Solicitors and homeowners say “agreement”. Surveyors and the Act itself say “Award”. The document is identical: a binding instrument under Section 10 of the Act.

4. What goes in it

• The proposed works, with drawings annexed
• The manner and timing of execution
• Hours of working — usually 8am–6pm Mon–Fri, 8am–1pm Sat
• Right of access provisions
• The Schedule of Condition (annexed)
• Surveyors’ fees and how they’re paid
• How damage is to be repaired or compensated
• Any specific protections — vibration monitoring, weather protection

5. What it costs in 2026

For a single Section 2 notice with one Agreed Surveyor, expect £900–£1,800 all-in. Two-surveyor cases for a typical extension run £1,800–£3,500. Basements and complex multi-neighbour cases can reach £8,000+.

The full breakdown is on the cost guide.

6. How long it takes

From notice served to Award signed: 3–5 weeks for an Agreed Surveyor, 4–8 weeks for the two-surveyor route. Add the statutory notice period (1 month for S1/S6, 2 months for S2) on top.

7. Common mistakes

Serving an invalid notice. Missing required information voids the notice — the clock has to restart. Trying to draft the Award yourself. The Act requires it to be signed by appointed surveyors. Skipping the Schedule of Condition. Without it, you have no defence against future damage claims.