The short answer
Starting notifiable work without serving a valid party wall notice is a serious mistake. The building owner cannot rely on the protections of the Party Wall etc. Act 1996, the adjoining owner can apply to court for an injunction to halt the work, and any damage becomes a common-law matter where the building owner may be fully liable. The courts have confirmed that without a notice, the Act simply does not apply — and you cannot invoke it after the event.
Why it matters
The Act gives the building owner valuable rights — defined procedures, rights of access, and a framework for resolving disputes — but they all depend on serving notice first. Skip it, and:
- the adjoining owner can seek an injunction, stopping the work, often at the worst possible time;
- there is no agreed schedule of condition, so any cracking is far harder to defend or to prove;
- damage claims fall to common-law nuisance, negligence or trespass, where the building owner’s exposure can be greater;
- relations with the neighbour sour, making everything slower and more expensive.
The leading cases confirm the principle bluntly: no notice, no Act. You cannot serve a notice retrospectively to cure work that has already been done without one.
What to do now
- Narrow the points in dispute. The more the owners can agree between themselves, the less the surveyors have to resolve — which keeps fees proportionate.
- If a surveyor is needed, use one. Both owners can appoint a single impartial ‘agreed surveyor’ rather than one each — quicker, cheaper and less adversarial. Coburns recommends a single agreed surveyor wherever possible.
- If you are the building owner and have not served notice, stop further notifiable work and take advice before continuing.
- Serve the correct notice before carrying out any remaining notifiable work, or reach a documented agreement with the neighbour.
- If you are the adjoining owner, record the current condition with dated photographs and raise the issue in writing.
- Take advice promptly on your options, whether that is an award going forward, an injunction, or a damages claim.
Common mistakes
- Assuming you can serve a notice “after the fact” to regularise completed work.
- Believing small or internal works do not count — many are still notifiable.
- Relying on a friendly verbal chat instead of a written notice.
- Carrying on once the neighbour has objected.
When to call Coburns
Whether you have started without a notice or your neighbour has, contact us early. We can often get matters back onto a lawful footing — with the right notice, a schedule of condition and an award — before the situation escalates to court.