A party wall agreement is the everyday name for what the Party Wall etc. Act 1996 produces: your neighbour’s written consent to your notice, or a surveyor’s award if they do not consent. You need one before you build on a shared boundary, cut into a party wall or dig close to next door’s foundations.
The Act applies throughout England and Wales, Essex included. What follows comes from GOV.UK, the government’s explanatory booklet and the Act itself, checked on 13/10/2026.
What is a party wall agreement?
The Act never uses the phrase “party wall agreement”. It sets out a notice process instead. You, the building owner, serve notice on the adjoining owner. They can consent in writing, refuse, or serve a counter notice asking for extra work at the same time. If they refuse, or simply do not reply, a dispute arises and surveyors settle it in a legal document called an award.
So when people talk about getting a party wall agreement, they mean one of two outcomes: written consent, or an award. GOV.UK’s party wall guide is plain about it: “Any agreement you reach should be in writing.”
What work does the Party Wall Act cover?
Three kinds of work, according to the government’s explanatory booklet:
- A new wall on the boundary (section 1). Building a wall up to or astride the line between your land and theirs.
- Work to an existing party wall (section 2). The booklet’s examples include cutting into a party wall to take the bearing of a beam, for example for a loft conversion, raising the wall to add another storey, and underpinning.
- Digging near next door (section 6). Excavating within 3 metres of a neighbour’s building and deeper than its foundations, or within 6 metres where the dig would cut a 45 degree line down from their foundations, as section 6 of the Act sets out.
A party wall is not only the wall between two semis. GOV.UK includes garden walls that stand on the land of two owners, though not wooden fences, and floors between flats.
What notices do you need to serve, and when?
Each kind of work has its own notice and its own minimum period. The booklet sets them out like this:
| Notice | Work | Served at least |
|---|---|---|
| Line of junction notice | A new wall on the boundary | One month before work starts |
| Party structure notice | Work to an existing party wall | Two months before work starts |
| Notice of adjacent excavation | Digging within 3 or 6 metres | One month before work starts |
A notice does not last for ever. Under section 3 of the Act, a party structure notice lapses if the work has not begun within twelve months, and the booklet warns that notices are “only valid for a year”. Serve too early and you may have to serve again.
Your neighbour then has 14 days to consent in writing. For a party structure notice or an excavation notice, doing nothing counts as a dispute (section 5 and the booklet). A counter notice has to be served within a month of your notice.
What happens if your neighbour does not agree?
Surveyors take over. You can appoint one surveyor together, which the Act calls an agreed surveyor, or each appoint your own. Two appointed surveyors select a third, who is only called on if they cannot agree. You cannot act as your own surveyor.
The surveyors produce the award. The booklet describes it as “a legal document that sets out the works to be carried out and how they are to be carried out”. Either owner has 14 days from receiving it to appeal to the county court. Who pays is covered in the questions at the end.
Why does a record of your neighbour’s house matter?
Because it settles arguments before they start. The booklet notes that an award “often contains a record of the condition of the adjoining property before the work begins”, usually called a schedule of condition. It is a dated record of next door’s walls, ceilings and floors, made before anything is dug or cut.
Craig has seen what happens without one. “We have experienced it before, where the neighbour, someone that’s been known for years, very, very nice, definitely would never cause us any problems,” he says. At the end of the build, cracks and damp are blamed on the work, and nobody can prove otherwise, “because no one’s actually been in their house, no one actually knows if that stuff was there before.”
His advice is to involve a party wall surveyor when you are working close to a neighbour’s house, “because ultimately it then just keeps it clean cut and allows you to maintain your relationship with the neighbour.” (Craig Bellamy, founder of Madisons, in his film on whether you need to tell your neighbours.)
Watch the film with its transcript: Do I need to tell my neighbours?
Does a party wall agreement replace planning permission?
No. The booklet says the Act “is separate from planning or building regulations control”, and agreement under it “does not remove the possible need to apply for planning permission”. The reverse is also true: planning approval does not satisfy the Act.
That is why the notices are worth planning early. If your extension needed a planning application, the council’s notices will already have gone to your neighbours, but that is not a party wall notice. Our planning permission guide covers whether your scheme needs permission at all.
How does party wall work fit into an extension or loft?
On most extensions and lofts near a boundary, party wall procedures sit alongside the design stage, not after it. Whether yours needs notices depends on the design and how close it sits to next door, so we flag it early and build any notice periods into the programme. That way a two month party structure notice does not hold up the start date.
The structural design often decides which notice you need: a steel bearing onto a party wall, or a foundation deeper than next door’s, shows up on the engineer’s drawings. Craig explains that role in what does a structural engineer do? Our structural engineer guide goes further.
If you are not sure where to start, ask us: we can advise, and introduce you to the right people for the party wall side. You can see how we run house extensions and loft conversions, or look at our Brentwood extension, where we built a full upper floor over an old flat roof extension.
Key points
- “Party wall agreement” means your neighbour’s written consent to your notice, or a surveyor’s award.
- The Act covers new walls on the boundary, work to an existing party wall, and digging within 3 or 6 metres of next door.
- Minimum notice: one month for a new boundary wall or an excavation, two months for work to a party wall.
- No written reply within 14 days counts as a dispute, and surveyors then make an award.
- A record of condition protects you and your neighbour; the award often contains one.
- The Act is separate from planning permission and building regulations. You may need all three.
Frequently asked questions
Is a party wall agreement the same as a party wall award?
Not quite. “Party wall agreement” is the common name for either outcome of the notice process. If your neighbour consents in writing, that consent is the agreement. If they refuse or do not reply within 14 days, surveyors settle the matter in an award, which is a legal document setting out the work and how it is carried out.
Do I need a party wall agreement for a rear extension?
Often. It depends on whether you build on the boundary, cut into a party wall, or dig foundations close enough to next door, and deep enough, to fall within the Act’s 3 and 6 metre rules. Many rear extensions on semis and terraces meet one of those tests. The engineer’s foundation drawings show which notice, if any, applies.
What happens if my neighbour ignores a party wall notice?
For a party structure or excavation notice, a neighbour who has not consented in writing within 14 days is treated as dissenting, and a dispute arises, as the government’s booklet explains. You then appoint a surveyor. If they still do not appoint one, you can appoint a surveyor on their behalf, and the surveyors produce an award.
Who pays for party wall surveyors?
Usually the building owner, meaning you. The government’s explanatory booklet says the building owner usually pays all costs of drawing up the award, including the neighbour’s surveyor’s fees, where the work is solely for the building owner’s benefit. A neighbour may share costs only where work is needed because of defects or lack of repair.
Is a schedule of condition a legal requirement?
The Act does not require one by name. The government’s booklet notes that an award often contains a record of the condition of the neighbour’s property before work begins, and it is sensible practice either way. A dated record of cracks and finishes means nobody has to argue later about what was already there.
Talk to us about your extension
We flag party wall procedures early, build the notice periods into the programme and can introduce you to the right surveyor. Get a quote, or call 01245 330103. We respond to every enquiry within 24 hours.