What is a party wall agreement and do I need one?
A party wall agreement is a legal document required under the Party Wall etc. Act 1996 when you carry out certain types of building work near a shared boundary with your neighbour. You must serve a written notice on your neighbour at least two months before work starts. If they consent in writing, you can proceed without a surveyor.
The three main triggers are: building on or along the boundary line, cutting into a party wall (for example to insert a steel beam), or excavating within three to six metres of a neighbouring building below its foundation level.
What happens if your neighbour does not consent
If your neighbour does not consent or does not respond within fourteen days, both parties need to appoint a party wall surveyor. You can agree on a single surveyor to act for both sides, which is cheaper, or each appoint your own. The surveyor prepares a party wall award that records the condition of the neighbour's property before work starts and sets out what work is permitted and how it should be done.
Typical costs
- Single agreed surveyor: 800 to 1,500 pounds
- Separate surveyors for each party: 1,500 to 3,000 pounds total (you pay for both)
- Neighbour consent in writing: no surveyor cost at all
Speaking to your neighbours early, ideally before formal notice is served, often results in written consent. A friendly conversation explaining what you plan to build and when goes a long way. If you skip the party wall process altogether and your neighbour later claims damage, you have no legal protection. The schedule of condition recorded in the award is your evidence that any cracks or issues existed before your work began.
What this means for a quote
When quoting for work that triggers the Party Wall Act, it helps to itemise party wall surveyor fees, notice periods, and any schedule of condition costs alongside the construction work. This gives the customer a complete picture of the total project cost. If you use TailoredQuote, you can include these regulatory costs as separate line items in the scope of works.
Official sources:
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