If your neighbour started work without a party wall agreement, you are not powerless. The Party Wall etc. Act 1996 gives adjoining owners real protection, and acting quickly – and calmly – usually gets the best outcome.
First: Are the Works Actually Notifiable?
Not every project next door needs a party wall agreement. Notice is only required for specific categories of work:
- Work directly to a shared (party) wall or structure – cutting in beams, removing chimney breasts, raising or underpinning the wall (Section 2).
- Building a new wall up to or astride the boundary line (Section 1).
- Excavating within 3 metres of your building and deeper than your foundations, or within 6 metres in some cases – see the 3 and 6 metre rule.
Internal redecoration, new kitchens or work well clear of the boundary is not covered. If the works are notifiable and no party wall notice was served, your neighbour is in breach of the Act.
What a Neighbour Who Started Work Without a Party Wall Agreement Should Have Done
They should have served notice one month before boundary or excavation works (two months for work to the party structure itself), waited for your response, and – if you dissented – had surveyors prepare a party wall award before starting. Skipping this removes your statutory safeguards, including a recorded schedule of condition of your property.
Your Options as the Adjoining Owner
- Speak to your neighbour first. Many building owners genuinely do not know the Act exists. A polite conversation, pointing them to the party wall process, often gets works paused and notices served.
- Write formally. If talking fails, a letter (or a solicitor’s letter) stating the works are notifiable and asking them to stop until the Act is complied with creates a paper trail.
- Seek an injunction. A court can order works to stop where notifiable work proceeds without notice. Injunctions are a genuine remedy but carry cost risk, so they are best reserved for ongoing, damaging works – take legal advice promptly, because delay weakens your position.
- Agree a retrospective arrangement. Strictly, the Act cannot be invoked retrospectively for completed work, but owners frequently agree to appoint surveyors part-way through so remaining works are covered by an award and existing damage is addressed.
- Claim for damage under common law. Your rights in nuisance, negligence and trespass are unaffected. If the works have cracked your walls or your neighbour has trespassed onto your land, you can recover the cost of repairs.
Evidence to Gather Straight Away
- Dated photographs and videos of the works, the boundary and any damage – inside and out.
- A note of key dates: when work started, what plant is on site, when cracks appeared.
- Copies of any letters, texts or planning documents relating to the project.
- A surveyor’s schedule of condition of the damage, prepared as soon as possible – this is invaluable if the matter escalates.
Where the argument is really about where the boundary lies rather than the works themselves, see our boundary disputes service.
FAQs
Can I force my neighbour to undo the work?
Rarely. Courts seldom order completed work to be demolished, but you can recover the cost of making good damage, and an injunction can halt works still in progress.
Does no notice mean the work is illegal?
Failing to serve notice is a breach of the Act rather than a criminal offence, but it strips the building owner of the Act’s protections and leaves them exposed to injunctions and damage claims – and courts take a dim view of it.
Who proves the damage was caused by the works?
Without a schedule of condition, the burden effectively shifts towards the building owner to show they did not cause fresh damage. Independent surveyor evidence is key – see party wall disputes and resolution.
Will this cost me anything?
If surveyors are appointed under the Act, the building owner normally pays the reasonable fees of both surveyors.
If work has started next door without notice, do not wait for the damage to spread. Contact us for same-day advice from an RICS party wall surveyor, or request a quote and we will set out your options in plain English.
Speak to a RICS party wall surveyor now: call 0204 579 8270 or request a free consultation – same-day advice across every London borough.