If your loft or extension touches a shared wall, sits on the boundary, or digs near next door's foundations, the Party Wall etc. Act 1996 probably applies. It isn't a planning thing, and it isn't optional, but it's also not as scary as it sounds. Here's the plain-English version.
When the Act applies
You almost certainly need to deal with the Act if you're:
- Cutting into or building off a party wall, for example, inserting steels for a loft conversion into the wall you share with next door
- Building a new wall on or up to the boundary line between your property and a neighbour's
- Excavating within 3 metres of a neighbouring building and deeper than its foundations (common with extension foundations), or within 6 metres in certain deeper-dig cases
If none of those apply, say, a rear extension that stays clear of the boundary and the neighbour's foundations, the Act may not be triggered at all. We flag which notices, if any, your project needs as part of the drawings.
The notices and their timing
The Act works by serving formal written notice on the affected neighbour before work starts. The notice period depends on the work:
- Party structure notice (work to the shared wall itself): at least two months before work begins
- Line of junction notice (a new wall on or at the boundary): at least one month before
- Notice of adjacent excavation (digging within 3m or 6m): at least one month before
You can start earlier than the notice period only with the neighbour's written agreement.
What the neighbour can do
Once served, the adjoining owner has 14 days to respond. They can:
- Consent in writing, and you're clear to proceed
- Dissent, or simply not respond, which after 14 days counts as dissent
A dissent doesn't mean they can stop your project. It means a dispute is formally "deemed" to exist, and the Act resolves it through surveyors: either one agreed surveyor acting fairly for both sides, or each owner appoints their own. The surveyor(s) produce a Party Wall Award, a document setting out how and when the work is done, with a schedule of condition recording the state of the neighbour's property beforehand, so any later damage claim is clear-cut.
Who pays?
Generally the building owner, you, the one doing the work, pays the surveyors' fees, because it's your project. A neighbour can also serve a counter-notice within a month asking for extra work for their own benefit, which they would pay for.
How we fit in
Two things to be clear about, because this is where homeowners get confused:
- We provide Party Wall guidance as part of the drawing package, telling you whether the Act applies, which notices you need, and the timing, so it doesn't ambush your build programme.
- Serving the formal notices and any surveyor work are separate from the drawings and priced separately. Party Wall surveying is a distinct professional role, and we'll point you to it when your project needs it.
The one thing that catches people out
Timing. A party structure notice needs two months. If you've booked a builder for six weeks' time and only start the Party Wall process now, you have a problem. We flag the notices you'll need at the drawing stage precisely so you can start the clock early and the legal side runs in parallel with everything else, not as a last-minute scramble that pushes your start date back.
TL;DR
- The Act applies if you cut into a shared wall, build on the boundary, or dig near a neighbour's foundations
- Notice periods: two months (party structure), one month (line of junction / adjacent excavation)
- The neighbour has 14 days to respond; no response counts as dissent, which is resolved by surveyors via a Party Wall Award
- The building owner usually pays the surveyors' fees
- We include guidance on which notices you need; serving notices and surveyor work are separate
- Start early, the two-month notice is the most common cause of a delayed build