Party Wall Agreements
The Party Wall etc. Act 1996 governs work to a shared wall, on the boundary line, or excavating near a neighbour’s foundations. AVA Home Design identifies at design stage whether your project is notifiable, produces the plans and sections your notices and party wall surveyor need, and where possible designs the work so the Act is not triggered at all.
Party wall matters sit entirely outside planning permission and building regulations. The gov.uk guidance is explicit that even with planning permission and building regulations approval in hand, a building owner still has to go through the proper party wall procedures. Getting your planning consent does not settle anything with next door.
Two things make this worth thinking about early. The notice periods are fixed by statute and cannot be shortened except by your neighbour’s written agreement — two months for work to an existing party wall, one month for a new wall on the boundary or for notifiable excavation. And the trigger is often the foundation design rather than the visible building, which means a decision made quietly on a drawing can be what puts your project into the Act.
To be clear about who does what: Sevda Kucuk is an Architectural Technologist, not a party wall surveyor. Our role is the design and the drawings. We tell you early whether your scheme is notifiable and why, we produce the plans and sections that excavation notices require by law, and we work alongside the party wall surveyor you or your neighbour appoints. Where a modest change to a foundation or a wall position keeps you outside the Act, we will show you that option first.
Notifiable work and its notice period
- Section 1 — new wall on the boundary
- Building a free-standing wall, or a wall of a building, up to or astride the boundary line. At least one month’s notice before the planned start date. If your neighbour does not consent to a wall astride the boundary, you are obliged to build wholly on your own land.
- Section 2 — work to an existing party wall
- Cutting into it, underpinning, inserting a damp-proof course, bearing a beam on it, raising its height, extending it downwards, cutting off projections, or demolishing and rebuilding it. At least two months’ notice.
- Section 6 — excavation near a neighbour
- Excavating within 3m of a neighbour’s building where the work will go deeper than the bottom of their foundations, or within 6m where the work would cut a plane drawn down at 45 degrees from the bottom of their foundations. At least one month’s notice, served with plans and sections showing the site and depth of the excavation.
Who this is for
- Terraced and semi-detached extensions where the new structure meets the shared wall.
- Loft conversions with steel beams bearing onto the party wall.
- Basement and lower-ground work, where section 6 excavation is almost always in play.
- Rear extensions on tight urban plots built up to the boundary.
- Anyone whose neighbour has served a notice on them and wants to understand it.
Frequently asked questions
- How much notice do I have to give my neighbour?
- Two months for work to an existing party wall or structure under section 2, and at least one month for a new wall on the line of junction under section 1 or for notifiable excavation under section 6. You can start sooner only if your neighbour agrees in writing. A notice stays valid for one year, so serving it far too early has its own risk.
- What happens if my neighbour does not reply?
- Silence counts against you rather than for you. Your neighbour has 14 days to reply in writing, and if they dissent — or simply do not respond within those 14 days — a dispute is deemed to have arisen under the Act and the surveyor process begins. It is worth talking to your neighbour before the formal notice lands, because a consent in writing avoids the whole procedure.
- Do I need a party wall agreement if I have planning permission?
- Yes, if the work is notifiable. The gov.uk guidance states plainly that the Act is separate from planning and building regulations control, and that a building owner with planning permission and building regulations approval should still follow the proper party wall procedures. They are three separate regimes and satisfying one says nothing about the others.
- Who pays the surveyor’s fees?
- Usually the building owner doing the work pays all the costs, because the work benefits them. Where work is necessary because of a defect or a need for repair in the shared wall, the costs can be apportioned between the owners. The Act deals with expenses at section 11, and the award records who pays what.
- What is a party wall award?
- It is the document that resolves the deemed dispute. It sets out the work that will be carried out, when and how it will be done, any additional protective work required, and rights of access for inspection. It is produced by the appointed surveyor or surveyors under section 10, not by us.
- Can good design avoid the Act altogether?
- Sometimes, and it is always worth asking. Section 6 turns on how deep you dig relative to your neighbour’s foundations, so a foundation solution that stays above that line, or a wall set back from the boundary, can keep a project outside the Act. It is not always possible or sensible, but it is a question best asked while the drawing is still on screen.
- What if I start work without serving notice?
- Do not. Carrying out notifiable work without a valid notice leaves you exposed to an injunction stopping the work and to civil liability for any damage, with none of the protection the Act’s procedures give you. It is also the fastest way to turn a cooperative neighbour into an obstructive one for the rest of the build.