First, the legal exposure
Carrying out notifiable work without serving notice doesn't automatically mean the work is unlawful in a criminal sense — the Act's primary mechanism is civil, not criminal. But it does mean you've bypassed the process the Act puts in place to protect your neighbour, and that exposes you in a few concrete ways:
- Your neighbour can apply to court for an injunction to halt the works until proper notice is served and the process is followed.
- If the works cause damage, you lose the protection the Act would otherwise have given you — the notice-and-award process exists partly to establish what "before" looked like and to set agreed terms for how work should proceed. Without it, any damage dispute reverts to ordinary negligence and nuisance law, which is slower, more adversarial, and more expensive for both sides.
- Some professional indemnity and warranty arrangements assume the Act has been correctly followed; skipping it can complicate matters if you later need to rely on them.
What to do next
The right response is almost always to stop and serve notice as soon as you realise, not to carry on and hope it goes unnoticed. In practice:
- Serve the correct notice now, describing the works accurately — including anything already completed. Being upfront about work already done is better than a notice that reads as if the project hasn't started.
- Speak to your neighbour directly, ideally before or alongside serving notice. Most disputes at this stage are driven by a neighbour feeling bypassed, not by the underlying works themselves. A conversation often defuses far more than the paperwork does.
- Consider a Schedule of Condition immediately, even retrospectively. It won't capture the true "before" state if works have already begun, but a prompt record still limits how much further dispute can escalate from this point.
- If your neighbour is already unhappy or work has caused visible impact, get a surveyor involved early rather than waiting for a formal dissent. A surveyor can often resolve an already-tense situation faster than an exchange of letters.
Will serving notice late cause more problems than it solves?
Some building owners worry that serving notice now — effectively flagging that they didn't do it earlier — will provoke a dispute that wouldn't otherwise have happened. In practice, the greater risk sits the other way: an adjoining owner who discovers notifiable work has been happening without notice is far more likely to escalate than one who receives a late notice with an honest explanation and an offer of a condition schedule.
What this means for your notice
If you're in this position, generate the notice for the actual state of the works today — don't backdate it or describe the project as not yet started if it has been. The platform's disclaimer covers the accuracy of what you enter; entering an inaccurate start date to make the notice look "on time" is the one thing that turns a recoverable situation into a genuinely difficult one.
This article is general guidance. If work is already causing visible impact on a neighbouring property, get a party wall surveyor involved directly rather than relying on self-service notice alone.