Party wall cost calculator: what a party wall cost calculator can estimate before a notice is served, and what only the neighbour's answer decides

How party wall cost calculator works

1. Count the adjoining owners honestly. Every owner with an interest in the adjoining property can be an adjoining owner, which on a converted house means the freeholder and each leaseholder. Enter the number of separate owners rather than the number of buildings, because the appointments follow the owners.
2. Choose the scenario, not the average. Run the calculator three times: everybody consents, one agreed surveyor, and separate appointments with a third surveyor selected. Those three numbers are the real range, and the middle one is what most jobs land on when the notice is served properly.
3. Add the schedule of condition. A photographic schedule of condition on each adjoining property is a visit and a report. Calculators frequently omit it, and it is the document that decides a damage argument later, so put it back into your own figure.
4. Leave room for an addendum award. Design changes after the award is served need an addendum, which is more surveyor time. Anyone who has not yet fixed the structural design should carry a contingency for one.
5. Replace the estimate with quotes before you serve. Two or three fee proposals from party wall surveyors, against the same description of the works and the same number of adjoining owners, will beat any calculator. Ask for them before the notice goes out rather than after a dissent arrives.

Paperwork and evidence

Common questions

What does a party wall cost calculator include?

Usually the surveyors' fees on an assumed scenario. It rarely includes the schedule of condition, an addendum award, or the cost of a third surveyor's involvement, all of which are real possibilities.

Can I avoid the cost entirely?

Yes, where every adjoining owner consents to the notice in writing within the statutory period. Consent ends the process and no award is needed, so a well explained notice served early is the most effective cost control available.

Why do quotes differ so much?

Because they are assuming different numbers of adjoining owners, different inclusion of the schedule of condition, and different treatment of the third surveyor. Give every firm the same brief and the spread narrows sharply.

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