Party Wall Work in London

The Party Wall etc. Act 1996 applies to a great deal of ordinary London building work, because most London houses share a wall with someone. Cutting a beam pocket into a party wall, removing a chimney breast from a shared stack, underpinning, and excavating near a neighbour's foundation are all notifiable, and none of them are unusual jobs.

This page is written from the contractor's side of that process. It covers what triggers a notice on a real project, how the statutory waiting periods affect your start date, who pays, and what the award then governs once we are on site. It is not written by a party wall surveyor, and GS Renovation is not one. Where you need a surveyor, you need a surveyor, and we will say so.

What actually triggers a notice?

Three sections of the Act do the work, and on a typical London renovation you meet at least one of them.

• Section 1, building a new wall at or astride the boundary line where none exists
• Section 2, work directly to a party structure: cutting in a beam, removing a chimney breast from a shared stack, raising or underpinning the wall, cutting away projections
• Section 6, excavating within three metres of a neighbouring structure and deeper than its foundations, or within six metres where a line drawn down at 45 degrees from the neighbour's foundation would meet your excavation
• Not notifiable: replastering your side, fitting shelves, ordinary redecoration, and most work that does not touch the party structure or excavate near it

The three metre and six metre rules catch extension foundations far more often than people expect, which is why they are checked at survey rather than discovered when the digger arrives.

Notice periods, and what they do to your programme

This is the part that costs time rather than money, and it is the reason we raise party wall matters at quotation stage rather than later.

Notice type	When it applies	Notice period
Party structure notice, section 2	Work to a shared wall, including beams and chimney breasts	2 months before work starts
Line of junction notice, section 1	New wall at or astride the boundary	1 month
Adjacent excavation notice, section 6	Foundations near a neighbouring structure	1 month
Neighbour's response window	They may consent, dissent, or say nothing	14 days
No response after 14 days	Counts as a deemed dissent, surveyors appointed	adds weeks

Source: GOV.UK Party Wall etc. Act 1996 explanatory booklet, 2026. Periods are statutory minimums.

Read that table as a start date, not as paperwork. A party structure notice served two months before you want to begin is the difference between a smooth start and a two month gap with a contractor booked. Where a neighbour dissents, add time for surveyors to be appointed and an award to be agreed.

Who pays for the surveyor?

You do, in almost every case, as the building owner carrying out the work, and that normally includes the adjoining owner's surveyor as well as your own. The work is for your benefit and your neighbour did not ask for it.

Scenario	What it covers	Typical cost
Neighbour consents in writing	No surveyor and no award required	£0
Single agreed surveyor	One surveyor acting impartially for both owners	£900 to £2,700
Two surveyors	Each owner appoints their own	£1,800 to £5,400
Preparing the award	The document itself	£500 to £1,000
Surveyor hourly rate	Varies widely by region and complexity	£90 to £450 per hour

Source: Checkatrade and MyBuilder 2026 cost guides and the GOV.UK explanatory booklet. Indicative UK ranges, not a quotation.

Costs can be shared where the work is a repair benefiting both properties, apportioned by the use each owner makes of the structure. A shared chimney stack that needed attention anyway is the clearest example. Our guide to who pays the party wall surveyor covers the exceptions in full.

What the award governs once we are on site

The award is a legal document about how the work is carried out, and we build to it. In practice it usually fixes working hours, access arrangements, the method for the notifiable elements, and the schedule of condition that records the neighbour's property before anything starts.

• A schedule of condition, photographed and agreed, which protects you against a claim for damage that was already there
• Agreed working hours, which on a shared wall matters more than on a detached house
• The method and sequence for the notifiable work, including propping and how the wall is cut
• Access over the neighbour's land where the Act permits it, and on what notice
• How any damage that does occur is put right, and by whom

A schedule of condition is worth insisting on even where the neighbour is content. It is the cheapest insurance in the process and it protects both sides.

What we do, and what we do not

We identify at survey stage which elements of your job are notifiable, tell you which notices apply and how long they take, build those periods into the programme, and then build strictly to whatever the award requires. We coordinate with the surveyors and with building control, which runs on an entirely separate track.

We do not serve notices on your behalf, we do not act as a party wall surveyor for either side, and we do not draft awards. The duty to serve sits with you as the building owner. A contractor who offers to handle the party wall process for you is offering something they should not, and it is worth asking who exactly would be signing the award.

The jobs this comes up on most

Steel beams bearing into a party wall, chimney breast removals from a shared stack, loft conversions where the new floor steels bear into the party wall, and extension foundations near a boundary. Those are our four most common notifiable jobs, and each has its own page.