The Party Wall etc. Act 1996 is separate from planning permission and building regulations, and it applies whenever work affects a shared wall, boundary, or excavates near a neighbour's foundations, regardless of whether you needed planning consent for the project itself. Getting it right protects both sides if something goes wrong, and getting it wrong can genuinely delay a build if a neighbour objects at the wrong moment. This guide sets out the notice types, timescales and typical costs involved, so you know what to expect before work starts.
When the Act applies
Three broad situations trigger the Act: work directly to a shared wall between semi-detached or terraced properties, building a new wall up to or astride the boundary line, and excavation within 3 to 6 metres of a neighbour's building where the depth of the new foundations goes below theirs. Most single-storey rear extensions on semi-detached or terraced houses trigger it through the excavation provisions alone, even where the extension itself does not touch the shared wall.
The three notice types
The Act sets out different notices depending on the type of work, each with its own required notice period before work can start. Serving the correct notice and observing the notice period is the homeowner's responsibility, not something building control checks for you.
| Section | Covers | Notice period | Typical surveyor fee range |
|---|---|---|---|
| Section 1 | New wall on or astride the boundary line | 1 month | £500–£1,200 per surveyor if appointed |
| Section 2 | Work to an existing shared/party wall (e.g. inserting a beam, raising the wall) | 2 months | £700–£1,800 per surveyor if appointed |
| Section 6 | Excavation near a neighbour's building (within 3m or 6m depending on depth) | 1 month | £500–£1,500 per surveyor if appointed |
Indicative UK ranges for 2026; actual surveyor fees depend on the complexity of the works, whether one surveyor acts for both parties (an 'agreed surveyor'), and the region. The building owner pays surveyor fees, including the adjoining owner's surveyor if one is appointed.
Serving notice
Notices must be in writing, describe the proposed works, and be served on every adjoining owner affected, which can include leaseholders as well as freeholders. Notices can be served by the homeowner directly or through a surveyor, and many people choose to have a surveyor draft the notice even if they intend to negotiate informally afterwards, since the wording needs to be accurate to be valid.
What happens after notice is served
An adjoining owner has three options: consent to the works, do nothing (which after the notice period effectively counts as a dispute), or formally dissent and appoint a surveyor. If they consent in writing, no further formal process is needed and work can proceed once the notice period has passed. If they do not respond within 14 days, the matter is treated as a dispute and moves to the surveyor process.
If a neighbour dissents
A dissent triggers the formal dispute resolution route set out in the Act. Each owner appoints a surveyor (or both agree to use one shared 'agreed surveyor'), and the surveyors draw up a party wall award covering the works, the condition of the neighbouring property before work starts (a schedule of condition), access arrangements and how costs are split. The award is legally binding on both parties. Dissent does not mean the project is blocked, it simply means the surveyor process governs how and when the work happens.
- Appointed surveyors agree a schedule of condition, usually photographic, before work starts
- The award sets working hours, access rights and any protective measures required
- Surveyor fees for both sides are normally paid by the building owner carrying out the works
- Either party can appeal the award to the county court within 14 days, though this is rare in practice
Timing it into your programme
Because notice periods run for one or two months and a dissent process adds further time for surveyor appointments and the award itself, party wall matters should be started as early as possible, ideally as soon as drawings are firm, rather than left until a start date is fixed. Leaving it late is one of the most common causes of an extension start date slipping.
Keeping the relationship workable
The Party Wall Act exists precisely because building work next to a shared structure can strain a neighbour relationship, and the formal process works best alongside, not instead of, ordinary courtesy. Explaining the project informally before notice lands on the doormat, sharing a rough timeline, and being upfront about noisy or dusty phases in advance generally heads off the kind of anxious dissent that comes from a neighbour feeling blindsided rather than from any genuine objection to the works themselves.
A worked example
Take a semi-detached house adding a single-storey rear extension with foundations going deeper than the neighbour's. Section 6 notice is served giving one month's notice, alongside informal contact explaining the plans. The neighbour has no objection to the design but wants their fence and shed included in a schedule of condition before digging starts, so photographs are taken and agreed by both sides. No surveyor is appointed, work proceeds after the notice period, and the schedule of condition is filed away in case any settlement cracks are later queried. This is the outcome on the large majority of party wall matters: a straightforward notice, a written schedule of condition, and no formal award needed.