Extensions, lofts and basements in London almost always touch the Party Wall etc. Act 1996. We serve valid notices, negotiate agreements and prepare awards — coordinated with your planning and structural drawings so your build starts on time and on the right side of the law.
You need to follow the Party Wall etc. Act 1996 — and usually appoint a party wall surveyor — whenever your London project cuts into a shared wall, builds on the boundary, or excavates near a neighbouring building. The Act is triggered if your project involves any of the following:
Finding a party wall surveyor in London usually happens too late — after planning is granted, when the builder is booked and a neighbour's objection can stall everything. Because we prepare the planning and structural drawings first, we see the party wall implications months before they bite. We flag which notices your scheme triggers, serve them at the right moment, and design details that make agreements easier to reach — moving a beam bearing, adjusting a foundation line, or adding underpinning detail that reassures the surveyor next door.
The Party Wall etc. Act 1996 applies across England and Wales, but London is its natural habitat: terraces, semis, mansion flats and infill plots where nearly every wall, boundary and trench sits within the Act's reach. A loft conversion cutting steels into the party wall, a rear extension built up to the boundary, a basement excavated beside a neighbour's footings — each one requires a valid party wall notice before work starts. Skip it and your neighbour can seek an injunction that halts the build, with you carrying the delay and legal costs.
Our party wall service covers the full statutory process: drafting and serving notices, negotiating consent where neighbours are amenable, and administering the formal award process where they are not. Everything is coordinated with the drawings we have already prepared, so the award reflects exactly what is being built — not a generic description that invites dispute later.
The Act sets strict sequences and deadlines. Followed properly, it protects both sides and rarely delays a well-planned build.
We review your drawings against the Act — sections 1, 2 and 6 — and confirm exactly which works are notifiable, which neighbours are affected, and what notice periods apply.
Party structure notices need two months before work starts; line-of-junction and adjacent-excavation notices need one month. We draft and serve them correctly, because an invalid notice restarts the clock.
Adjoining owners have 14 days to consent or dissent. Consent in writing means work can proceed. Silence counts as dissent under the Act, and the formal procedure begins.
Both owners can appoint one agreed surveyor, or one each. The surveyors prepare a party wall award setting out the works, working hours, access and protections, plus a schedule of condition of the neighbouring property.
With the award served, your build proceeds lawfully. The schedule of condition protects both sides: genuine damage is evidenced and made good, and spurious claims are ruled out.
Tell us about your project and get a fixed, no-obligation quote back within one working day. If you don't need planning permission at all, we'll tell you that too — for free.
In practice, most structural work on an attached London property is notifiable. These are the projects we handle party wall matters for every week.
Steel beams almost always bear into the party walls, and raising the wall for a dormer is notifiable too. A section 2 party structure notice is required two months before the steels go in.
Building up to or astride the boundary triggers a line-of-junction notice, and foundations within 3 metres of next door's footings trigger an excavation notice as well.
The most demanding case: underpinning the party wall plus deep excavation within 3 or 6 metres of neighbouring buildings. Expect awards on both sides and detailed structural method statements.
Removing a breast from a party wall and inserting support is notifiable work on a party structure — commonly overlooked, and a frequent cause of neighbour disputes when skipped.
In converted and mansion flats, floors and walls between flats are party structures. Alterations that cut into them are notifiable to the neighbours above, below and beside you.
Rebuilding or raising a shared garden wall — a party fence wall — falls under the Act, as does building a new wall along the boundary line.
Build the notice periods into your programme from the start: two months for work to a party structure, one month for new boundary walls and adjacent excavation. If neighbours consent promptly, the process can conclude within those periods. If surveyors are appointed, allow several additional weeks for the schedule of condition and award — which is why we recommend serving notices as soon as planning drawings are settled, running the party wall clock in parallel with your planning application rather than after it.
The Act is not a planning regime — the council plays no part — and your neighbour cannot use it to veto your project. What the award controls is how notifiable work is carried out: protections, hours, access and making good. Handled early and courteously, most party wall matters in London settle by consent or with a single agreed surveyor. Handled late or aggressively, they harden into two-surveyor disputes precisely when your builder is ready to start. A friendly conversation before a formal notice lands on the doormat remains the single best piece of party wall advice we can give.
Because your notices, drawings and structural details all come from one coordinated team, adjoining owners' surveyors get clear, consistent information first time — which shortens negotiations and keeps your start date intact. Call 020 7864 7245 or request a quote and we will tell you exactly which notices your project needs.
A party wall agreement — formally a party wall award — is a legal document prepared under the Party Wall etc. Act 1996 governing notifiable work near or on a shared structure. You need one whenever a neighbour dissents from a party wall notice, or fails to respond within 14 days.
Two months for work to a party structure, such as cutting in loft steels or underpinning, and one month for a new wall at the boundary or for excavation within 3 or 6 metres of a neighbouring building. Work cannot lawfully start until the notice period runs or an award is in place.
Silence for 14 days counts as dissent under the Act. The formal procedure then begins: each owner appoints a surveyor, or both agree on one, and an award is prepared. Your project is not blocked — the Act exists to let lawful work proceed while protecting the adjoining owner.
No. The Act cannot be used to veto work that has planning permission or falls under permitted development. It only governs how notifiable work is done — protections, access, hours and making good damage. Refusing consent triggers the award process; it does not stop the project.
If all adjoining owners consent in writing within 14 days, no award is needed and work can proceed. We still recommend a photographic schedule of condition before starting, because it protects both parties if damage is alleged later. It is quick, inexpensive and prevents most disputes.
Yes. In converted houses and mansion blocks, the floors and walls separating flats are party structures, so cutting into them is notifiable to the owners above, below or adjoining. Leaseholders usually also need freeholder consent for structural alterations, which we can identify alongside the party wall process.
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