Find out early whether your build needs party wall notices

Blueprint site plan of three terraced houses with the shared walls and a planned rear extension marked, beside a checklist

For homeowners in England and Wales planning a loft, extension or basement. Get early advice on notices, neighbours and timing, and compare quotes from party wall surveyors before the work is booked.

Party wall matters are easiest to deal with before you have a builder booked. At the design stage, a party wall surveyor can tell you whether the Party Wall etc. Act 1996 is likely to apply, which neighbours are affected, which notices you will need and how much time they add to your programme. Loft conversions, rear and side extensions, basements and new builds on a boundary commonly bring the Act into play. Early advice also helps you plan the conversation with your neighbours, budget for surveyors’ fees and avoid surprises, such as beams that need to bear into a shared wall.

How a professional can help

Does the Act apply to your plans?: A surveyor reads your drawings and explains whether your work touches a shared wall, sits on the boundary or digs near a neighbour’s foundations. Small internal jobs such as putting up shelves aren’t usually covered.
Which neighbours are affected: It isn’t always just the house next door. Work can affect owners on both sides, behind you, or above and below in a block of flats, and freeholders and leaseholders may each need notice. Your surveyor maps who’s who.
A timetable that includes notice periods: Two months for work to a party wall and one month for excavation or a boundary wall, plus time for replies and any surveyors, can add up. Early advice helps you book your builder for a realistic start date.
Design choices that reduce the impact: A small change, such as moving a beam position or keeping a dig further from the boundary, can sometimes reduce how much of the Act applies. Any change must be agreed with your structural engineer so the structure still works.
Who does what on your project: A party wall surveyor deals with the Act, a structural engineer designs the beams and foundations, and building control checks the Building Regulations. Early advice shows who needs to talk to whom, and in what order.
Budgeting for the process: The building owner normally pays the reasonable surveyors’ fees on both sides, and how much depends on the number of neighbours and the work involved. Early advice means the fees don’t come as an unwelcome surprise.

Is this right for you?

You’re at the sketch or design stage and haven’t booked a builder yet.
Your designer or engineer has mentioned party wall notices and you want to know what that means in practice.
You live in a terrace, a semi-detached house or a flat and share walls, floors or ceilings.
You want to keep your neighbours on good terms and avoid a formal dispute.
You’d like to understand the likely process and fees before you commit to the build.

How the project usually runs

Share your plans: Send your drawings or describe the project: the property, the work and the neighbours on each side. Early sketches are enough for a first conversation.
Get a clear answer: The surveyor says whether the Act is likely to apply, which notices would be needed and who they would go to, and flags anything in the design that raises questions.
Plan the programme: Notice periods, and the time to reach consent or a party wall award, are added to your timetable, so the builder, scaffolding and deliveries can be booked around them.
Speak to the neighbours: You introduce your plans to the neighbours, with drawings if helpful, before the formal notices arrive, and the surveyor can help with what to say and when.
Serve notices and appoint: When the design is settled, notices are prepared and served. If a neighbour doesn’t consent, you appoint a surveyor, or agree one with your neighbour, to settle the terms.

What affects the cost

How many neighbouring owners will be affected, including both sides, behind, and above or below.
How many different notices your project needs: wall work, excavation, boundary walls or a mix.
Whether your neighbours consent, or surveyors need to be appointed and a party wall award prepared.
How early the design is: advice on sketches is quicker than a review of full structural drawings.
Whether you want a surveyor to handle the notices and the conversations with neighbours, or only to advise.

Party wall, planning and building control together

Surveyors across the UK can tell you early whether the Party Wall etc. Act 1996 applies at your address. It covers England and Wales, and Scotland and Northern Ireland follow different rules.
Party wall is separate from planning permission and Building Regulations approval. Approval from the council doesn’t replace the notices, and the notices don’t replace the approvals.
Structural alterations should be designed by a chartered structural engineer before any wall is cut or ground dug, and the notices should reflect that design.
The Act doesn’t settle boundary disputes or rights of light, which are separate issues needing their own advice.

Questions people ask

Do I need party wall notices for an extension?

Often. Building on the boundary, cutting into a shared wall or digging foundations near next door can each bring the Act into play in England and Wales. An extension that is well away from every neighbour may not. A party wall surveyor can confirm from your drawings and the position of the neighbouring buildings.

Is a party wall agreement the same as planning permission?

No. Planning permission and Building Regulations approval deal with whether the building is acceptable and safe. Party wall notices deal with your relationship with neighbours when work affects shared walls, the boundary or their foundations. You normally need to deal with each separately.

When should I speak to a party wall surveyor?

As early as your design allows. Surveyors can advise on sketch drawings, and early advice lets you plan the notice periods into your timetable before you book your builder. Notices need at least one or two months, so leaving it late can delay your start.

Do I have to tell my neighbours before I serve a notice?

No, the Act doesn’t require it, but most people find a friendly conversation helps. Neighbours who have seen your drawings and heard from you first are often less worried when a formal notice arrives, and may be more willing to consent.

Should I wait for planning permission before asking about party walls?

No need. Party wall matters are separate from planning, and early advice can shape the design. Notices work well once the design is settled enough to describe the real work, which is often after planning permission or a permitted development check. A party wall surveyor can suggest the right moment.

Available across the UK

Party wall surveyors cover the whole of the UK. The Party Wall etc. Act 1996 applies in England and Wales; Scotland and Northern Ireland have different rules, and a professional can tell you what applies to your property.