Building close to a boundary brings duties that catch a lot of self-builders and homeowners out. The assumption is usually that the builder carries the risk, or that a standard public liability policy will pick up anything that goes wrong next door. Neither is reliably true.
Where the liability actually sits
If you are the person having the work done, you are the one with the obligations to the adjoining owner. Your contractor has their own insurance, but it covers their liability, not yours. If you are managing the project yourself, the responsibility for the site and for the effect it has on neighbouring property sits squarely with you.
That matters because damage next door is not a remote possibility. Excavation close to a foundation, cutting into a shared wall, removing a chimney breast or underpinning a basement all put load paths and ground conditions in play.
When the Party Wall etc. Act 1996 applies
The Act bites in three broad situations.
- Building on or at the boundary of two properties.
- Work to an existing party wall or party structure. Cutting into it, raising or reducing it, removing a chimney breast, or taking it down and rebuilding it.
- Excavating below and near the foundation level of a neighbouring property, within three or six metres depending on the depth and type of work.
In practice that pulls in most loft conversions, rear and side extensions, basement works, remodels and anything touching a shared wall. It is far broader than people expect.
A “party wall” is not only the obvious shared wall between two houses. It also covers a garden or boundary wall standing on two owners’ land, and a wall standing on one owner’s land but used by two or more owners to separate their buildings.
What the Act requires of you
- Serve the correct notice. Before work begins, on the adjoining owner. The notice period depends on the type of work, typically one or two months.
- Get a condition survey done. A record of the neighbouring property’s existing state, before anything starts. This is the single most useful document you can have, because it is what settles the argument about whether a crack was already there.
- Appoint a surveyor if your neighbour dissents. One or two surveyors then draw up a Party Wall Award, a legal document setting out how and when the works are carried out.
Your neighbour has real rights here. They can influence how and when the work happens, and if the process is not followed properly you can find the project stopped.
Scotland and Northern Ireland
The Act itself applies in England and Wales. In Scotland and Northern Ireland the same kind of exposure exists, but it arises under common law rather than under the Act. The practical advice is the same: establish the condition of the neighbouring property before you start, and make sure your cover responds.
Why public liability on its own is not enough
This is the part that surprises people. Under the Act, your neighbour has a legal right to be compensated for loss or damage caused by your works, regardless of whether the damage was intended or foreseeable.
Standard public liability insurance responds to negligence. It is not designed to meet a liability that arises because the work was done at all, properly or otherwise. So the very exposure the Act creates is the one a general liability policy is least likely to answer.
How site insurance responds
Protek can include party wall contractual liability within your site insurance policy. We ask at the quote stage whether your project involves works on or next to a party wall, and where it does we can build that cover in rather than you needing a separate policy.
It is conditional on you doing your part: serving the correct notice, and having a condition survey of the neighbouring property carried out before work starts. Follow the Act properly and the cover does its job.
Before you break ground
- Work out early whether your project triggers the Act. If you are within three or six metres of a neighbour’s foundations, assume it does until told otherwise.
- Serve notice in good time. It is not a formality you can backfill.
- Get the condition survey done and keep a copy somewhere safe.
- Tell your insurer. Cover that does not know about the party wall exposure will not respond to it.
Our Party Wall Act page sets out the requirements in more detail, and you can get a quote with party wall contractual liability included, or call the team on 0333 456 8030 to talk through a specific site.
