The Party Wall etc. Act 1996 is the law that governs building work on or near shared walls and boundaries in England and Wales. It is not there to stop your project — it exists to let notifiable work go ahead while protecting the neighbour who shares the structure. This guide explains what the Act covers, what it requires of you, and what rights it gives you when you're on the receiving end.
What work does the Party Wall Act cover?
Three categories of work trigger the Act. Section 2 — work to a party structure: cutting in beams for a loft conversion, removing a chimney breast, raising, thickening, underpinning or demolishing a shared wall. Section 1 — new building at the boundary: building a new wall at or astride the line of junction. Section 6 — nearby excavation: digging within 3 metres of a neighbour's structure and deeper than their foundations — or within 6 metres where a 45° line drawn down from their foundations would be cut (the “3 metre rule” and “6 metre rule”). Most extensions, lofts and basements in terraced and semi-detached housing are notifiable under at least one of these.
What the Act requires: notices first
Before starting notifiable work you must serve a written party wall notice on every adjoining owner — one month ahead for boundary walls and excavation, two months for work to a party structure. Neighbours then have 14 days to respond. Consent in writing and work can proceed (with a wise schedule of condition first); dissent — or silence — and a “dispute” formally arises.
Adjoining owner rights under the Act
If you're the neighbour: you cannot veto lawful work, but you are entitled to a surveyor appointed at the building owner's expense, protection through a party wall award setting hours, methods and protections, compensation for loss or damage, and security for expenses on risky work such as basements. You also have the right not to be left worse off: damage attributable to the works must be made good or paid for under section 10.
What happens if the Act is breached?
Starting notifiable work with no notice removes your legal protections and exposes you to an injunction — a court order stopping the build, obtained quickly and at your cost. Completed unauthorised work can't be retrospectively authorised (see our guide to selling with no party wall agreement), and damage disputes then run through the courts rather than the Act's cheaper surveyor process. Serving notices properly is always the cheaper path.
Get the Act handled for you
Survey Merchant's RICS party wall surveyors serve compliant notices within days and act for building owners, adjoining owners or both as Agreed Surveyor — with local teams in London, Manchester and Chester. See our party wall cost guide or get a fixed quote →
