If you plan to extend a semi-detached or terraced house, or build close to a neighbour's boundary, you may need to follow the Party Wall etc. Act 1996. It protects both you and your neighbour. This guide explains the basics in plain English.
This is general information, not legal advice. The Act applies in England and Wales, so it applies in Newport, but your exact situation may need advice from a party wall surveyor or solicitor.
What is a party wall?
A party wall is a wall that stands on the boundary of two properties or that separates buildings owned by different people, such as the wall between two semi-detached houses. The Act also covers party fence walls (such as a garden wall) and excavations close to a neighbour's building.
When does the Act apply?
You must usually serve notice if you plan to:
- Cut into a party wall, for example to insert a steel beam for a loft conversion or opening
- Raise, thicken or rebuild a party wall
- Build a new wall on the boundary line
- Dig foundations within roughly 3 metres of a neighbour's building (if deeper than their foundations) or within about 6 metres in some circumstances
Not every project is covered. Interior works that do not touch the party wall usually are not.
Notices and timing
Your neighbour (the adjoining owner) must receive written notice before work begins. As a rule:
- Party structure notice: at least two months before work starts
- Notice of adjacent excavation: at least one month before
- Line of junction notice (building on the boundary): at least one month before
The neighbour then has 14 days to respond. If they consent in writing, no further steps are needed. If they do not respond, or they dissent, a dispute is deemed to exist and surveyors become involved.
Surveyors and the party wall award
When there is a dispute, either:
- you and your neighbour agree one surveyor to act for both, or
- each of you appoints your own surveyor
The surveyor(s) prepare a party wall award, a legal document recording the work, how it will be done, working hours and a schedule of condition of the neighbour's property. The building owner (you) normally pays the reasonable surveyor fees of both sides, which are often several hundred to over a thousand pounds per property for a straightforward job, and more for complex cases.
Party wall agreement vs planning vs building regulations
A party wall agreement is separate from:
- planning permission, which may or may not be needed
- building regulations approval, which is almost always needed
Your neighbour cannot stop you building within your rights, but the Act sets how and when the work must happen and protects them from damage.
Tips for a smooth process
- Talk to your neighbour first. A friendly chat before the formal notice avoids surprises.
- Give them drawings and explain the timescale and what work will take place.
- Serve notice properly and keep proof of delivery.
- Allow time. Do not book builders to start before the notice period has passed.
- Use an experienced surveyor if there is any dispute.
What if I ignore it?
Starting work without the required notice can lead to injunctions, delays, costs and damage claims, and it can cause problems at sale. It is far cheaper to follow the process.
Planning an extension near a boundary?
Abron Contracting can talk you through the timing so that notices, approvals and construction fit together. Contact us or call 01633379170.
Frequently asked questions
Do I need a party wall agreement for an extension?
Only if the work affects a party wall, a boundary wall or involves excavation near a neighbour's building. Many rear extensions on detached houses do not need one; terraced and semi-detached projects often do.
How much notice must I give?
Typically two months for work on a party structure and one month for excavation or building on the line of junction.
Who pays for the party wall surveyor?
Usually the building owner (the person doing the work) pays the reasonable costs of both surveyors.
Can my neighbour stop my extension?
They cannot stop work you have a legal right to carry out, but they can ensure that it is done in a way that protects their property, via the party wall award.
Is a party wall agreement the same as planning permission?
No. They are completely separate processes.
