KNOW THE RULES

Do I need a party wall agreement?

Whether you need a party wall agreement depends on your work and England/Wales law; Scotland and NI have no such Act.

PW-01The short answerIt depends on what you're building and where in the UK you live. In England and Wales, the Party Wall Act 1996 means you must tell your neighbour in writing before certain work on a shared wall, boundary wall, or excavation near their building. Scotland and Northern Ireland don't have this Act, so different rules apply there.
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The Party Wall Act 1996 creates a legal duty to serve written notice before specified work, in England and Wales only.

PW-02Check which part of the UK you're inThis guide covers England first. The Party Wall Act 1996 also applies in Wales, but not in Scotland or Northern Ireland, which use different legal systems entirely. If you're outside England, skip to the devolved nations step at the end.
PW-03Check the distances and depths that trigger itNotice is usually needed for work directly on a shared (party) wall, building a new wall on the boundary line, or excavating within 3 metres of a neighbour's building where you'll dig deeper than their foundations. It can also apply within 6 metres if your excavation is deep enough to cut a line drawn at 45 degrees down from the bottom of their foundations. These are the Act's own thresholds, so check your specific project against them rather than guessing.
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The Act sets fixed distance and depth triggers; if your work meets them, serving notice is a legal requirement, not optional.

PW-04Know the exceptions that change the answerFlats and maisonettes often share structural walls or floors, so party wall rules apply more often, not less. Being leasehold doesn't exempt you; if your work falls within the Act, you still need to serve notice, though your lease may have its own separate rules on top. Listed building or conservation area status doesn't change whether the Party Wall Act applies, it's a completely separate set of rules.
PW-05Party wall notice, planning permission and building regs are separateA party wall agreement is not planning permission and not building regulations approval. You may need all three, any two, or just one, depending on your project. Getting planning permission or a building regs sign-off does not mean you've met your party wall duties, and vice versa.
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These are three distinct legal regimes; satisfying one does not satisfy the others.

PW-06Who to ask and howCheck GOV.UK's party wall guidance to see if your work is covered, and use the Planning Portal if you also need to check planning rules. If your neighbour doesn't agree to your notice, you'll need a party wall surveyor to draw up a party wall award; this can be one surveyor acting for both of you, or one each.
PW-07Costs and timescalesServing notice yourself costs nothing but your time. If a surveyor is needed, expect roughly £700 to £1,500 or more per surveyor, and you usually pay for your neighbour's surveyor too. You must give at least 2 months' notice for work to a party wall or new wall on the boundary, and at least 1 month's notice for excavation work.
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The Act sets minimum notice periods of 1 or 2 months depending on the type of work.

PW-08What happens if you skip itStarting work without serving a required notice can lead to your neighbour seeking an injunction to stop the work, or a court ordering you to pay for damage or put things right. It can also cause problems when you come to sell, as buyers' solicitors often ask for proof notices were served. Indemnity insurance is sometimes offered as a fix, but it only covers certain financial risks and doesn't replace getting it right at the time.
PW-09If you live in Wales, Scotland or Northern IrelandWales is covered by the same Party Wall Act 1996 as England, so the same rules and notice periods apply. Scotland has no party wall legislation; shared walls are governed by common law and the law of the tenement, and separate building warrant rules apply to the building work itself, check mygov.scot. Northern Ireland also has no party wall Act; it relies on common law and its own building control system, check nidirect for guidance.
RULES
KNOW THE RULES

Scotland and Northern Ireland have their own distinct legal systems for shared walls and building work, separate from England and Wales.

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