Party Wall Cost Calculator
Estimate the surveyor fees for works affecting neighbouring properties, including each adjoining owner surveyor and schedules of condition.
💼 Are you a real estate agent or broker? Send this calculator to your buyers on your own branded listing page — every enquiry comes straight to your WhatsApp. Create free agent page →Building work that affects a shared wall, a boundary structure or excavates near a neighbour's foundations is notifiable in many jurisdictions, and the building owner normally pays for both sides' surveyors. Costs scale with the number of neighbours, not with the size of the job.
A terraced extension with two adjoining owners can generate two separate awards and two sets of fees, which is why the neighbour count matters more than the build cost.
How the fees arise
You appoint a surveyor and pay for them. Each adjoining owner may appoint their own, and the building owner normally pays those fees too, plus a schedule of condition recording each neighbour property before work starts. If surveyors cannot agree, a third is appointed and adds further cost.
Worked example
With two adjoining owners, your own surveyor at 1,200, their surveyors at 1,400 each and a 400 schedule of condition for each neighbour: the neighbour side costs 3,600 and the total is 4,800 — 2,400 per adjoining owner, and two separate awards.
An agreed surveyor halves it
Where a neighbour is willing, both sides can appoint the same surveyor, which typically removes one full fee per neighbour. Approaching neighbours informally before serving notice is what makes that possible, and it also reduces the chance of a dispute.
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Create your free property pageFrequently asked questions
When are these works notifiable?
Typically for work on a shared wall, building on the boundary line, or excavating below a neighbouring foundation within a defined distance. The specific triggers are set by local legislation, so check what applies before starting.
Who pays the surveyor fees?
Normally the building owner carrying out the work, including the adjoining owner surveyor. That is why the neighbour count drives the cost — each one can appoint separately and each award is a separate process.
What if the neighbour refuses to respond?
Most regimes treat non-response as a deemed dispute after a set period, and a surveyor is appointed on their behalf. It slows the project and costs more, so early informal contact is worth the effort.