What Is a Party Wall Agreement and Do I Need One?
If you're building an extension near your neighbour's boundary, you may need a party wall agreement. Here's what it is, when you need one, and how the process works.
What Is a Party Wall?
A party wall is a wall that sits on the boundary between two properties and is shared by both owners. It can also refer to a wall that stands entirely on one owner's land but is used by both properties — such as a wall between semi-detached or terraced houses. The Party Wall etc. Act 1996 provides a framework for resolving disputes between neighbours when building work affects a party wall.
When Do I Need a Party Wall Agreement?
You need to serve a party wall notice if you plan to:
How Does the Process Work?
1. Serve a notice
You must serve a written party wall notice on your neighbour at least 2 months before work begins (1 month for excavation work).
2. Neighbour responds
Your neighbour has 14 days to respond. They can consent (agree), dissent (disagree), or not respond at all.
3. If they consent
Great — you can proceed with the work. No further action is needed, though it's wise to record the agreement in writing.
4. If they dissent or don't respond
Both parties must appoint a party wall surveyor (or agree on a single 'agreed surveyor') to prepare a Party Wall Award — a legal document that sets out the work, protections, and any conditions.
How Much Does It Cost?
The building owner (you) pays all party wall surveyor fees — even for your neighbour's surveyor.
Our Advice
Talk to your neighbours early — before you serve any notices. A friendly conversation explaining your plans goes a long way. Most neighbours are happy to consent when they understand what's being built and how it affects them. We can advise you on whether a party wall notice is needed and recommend experienced party wall surveyors if required.
Need Advice on Party Walls?
We'll advise you on whether a party wall notice is needed and guide you through the process.