You know the Party Wall etc. Act 1996 well enough — every project that touches a shared wall or digs near a neighbour's foundations brings it back to the table, and every client asks the same three questions: what notice do we need, how long will it take, and what will it cost them? We've been answering those questions for London homeowners and the practices behind them since 2008, and a large part of our work comes straight from architectural practices, usually as a quiet referral between one more project and the next.

This page is written for you rather than for your clients. It explains which of your projects will actually trigger a notice, where the party wall process fits into your programme, and what a specialist surveyor should give you in return for the fee. Your clients get plain-English answers too — we'll explain their position to them, not just to you, so the questions stop coming back over the table.

Which of your projects will need a party wall notice?

The Act only bites in three situations, and all of them show up regularly in the work practices send our way. Our guide to the Party Wall etc. Act 1996 covers the detail, but the short version is this:

Building on the line — a new wall at or over the boundary, or a new wall of enclosure on your own land that is within the required distance of a neighbour's. Rear and side returns are the classic example.
Building into a shared wall — cutting into a 9-inch brick party wall for a beam, raising or lowering a party fence wall, or building on top of one. This is the most common notice for home extension projects: the side return where the RSJ goes through the neighbour's half, the rear extension where you're underpinning a shared wall.
Digging near a neighbour — any excavation within 3 metres of a neighbour's building on the line, or 6 metres where the new foundations would cut a 45-degree plane below their existing foundations. Basements, cellar conversions and plant pits all live here, and this is where "we thought it wouldn't apply" most often turns out to be wrong.

Where works are minor, our advice is sometimes that the simplest party-wall-free route is the best one — a new wall stepped back from the line, for instance, can keep a project entirely outside the Act. We'll happily have that conversation with you before the design is frozen, which is where the choice can still be cheap.

Where the party wall process fits into your programme

Once a project is caught, the mechanics are set by the Act, and the single most useful thing to know is the clock. Written notice must be served at least two months before works begin for work to an existing party structure under Section 3, and one month for building on the line of junction under Section 1 or excavating nearby under Section 6. The notice itself is only valid if it describes the works with drawings — which is why we ask for your drawings as soon as they exist, even at sketch stage, rather than waiting for issue for construction.

After that, three paths open up:

The neighbour consents in writing. No surveyors are appointed, no award is needed, and the works can proceed on the notice clock alone. This is where most of our work ends — it's the outcome our approach is designed to produce, and it's the one that protects your programme best, because nothing has to be agreed, costed or negotiated in parallel.
The neighbour dissents or does nothing. If there's no consent within the notice period, the parties appoint surveyors (one each, or a single agreed surveyor plus the building owner's) and the works can only proceed under a legally binding award. We handle the appointments, negotiate the terms, and where an award is needed we prepare it — including a schedule of condition of the neighbour's property and the allocation of costs.
The works are urgent or disputed. Where consent is contested or time is genuinely short, the award can include consent to the works on specified terms. These cases are a minority, but when they happen they're the ones that eat a project's slack, and they're where having a surveyor who already knows your design helps most.

The practical rule we suggest is to serve notices as early as the design allows — ideally the moment you're confident the scheme is going to happen, well before structural design is complete. The notice clock then runs in parallel with planning, approvals and long-lead elements, and the party wall process stops being something that sits on top of the programme and becomes part of it. If a project is already running and the Act has crept up on you, our guide to the party wall notice timeline is a useful handout for the client.

Why practices choose us to run it

A consent-first approach

A notice is not a threat to a neighbour, and we write and deliver them as if the other side will read it that way. Consents are signed before works start on the great majority of the notices we serve, which is exactly what a practice wants: the process done, in writing, with nothing left to negotiate while the contractor is on site. Where a neighbour has concerns — and in a tight London street they usually do — we work through them with the same tone, because a neighbour who feels looked after is a neighbour who signs.

Capped, predictable client fees

Our fees for the building owner are quoted up front and capped — the fee does not rise with the number of calls, site visits or letters, and the quote includes dealing with reasonable damage claims once the works are complete. For your client that means a line in the cost plan that doesn't grow, and for you it means the party wall item stops being a source of surprise. There's no hourly meter running while we sort out a dispute that our notice drafting should have avoided.

Free advice to architects

You don't owe us a fee to ask us a question. If a scheme is borderline — a party fence wall with a question mark over its height, an excavation a metre short of the line, a wall you're not sure is a party wall at all — ring us before it gets costed. For smaller works in particular, that ten-minute call is often the difference between a two-month notice process and nothing at all.

We already speak architect

We liaise directly with your structural engineer on the drawings, confirm which details the notice and any award will need to capture, and keep the surveyor side of the correspondence away from your desk. We've worked with London practices for over a decade, and most of our practice clients send us projects without a second thought. Our guide to choosing a party wall surveyor and breakdown of surveyor fees are both worth passing to clients who want to understand what they're being charged and why.

What an architect says about us

"As Chartered Architects working in London we frequently require assistance with party walls. Grey & Associates have provided such services for most of our clients over the last decade, including some very difficult sites and situations."

Neil Kahawatte — Chartered Architect

Three things that make the process painless

Check before you freeze. A five-minute look at the drawing set before design is final can save a notice, a consent negotiation, or an award. Early advice is free, and late advice is where fees come from.
Serve early, serve with drawings. A notice served on a half-finished drawing set takes months to validate; one served on workable drawings takes a consent clock. Early is the only advice on this list that never goes out of date.
Let us talk to the client. When the client calls with a party wall question, we're happy to answer it themselves — it keeps you out of the middle of it and it's usually what they wanted anyway.

Working on a project that touches a shared wall?

Send us the drawings — or just a description — and we'll tell you straight whether the Act applies, what notice you'd need, and what your client's fee would be. No obligation, and the advice is yours to keep either way.

Most of our practice time goes on basement and underpinning schemes and the period housing of Kensington, Chelsea, Knightsbridge, Hammersmith, Chiswick and Ealing — the same briefs your practice is likely to be running. The three documents you will see on every file are the party wall notice, the schedule of condition and the award.

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