Why multiple quotes help
They reduce the risk that an unusually high or low figure becomes the basis of settlement simply because it was the only estimate obtained.
Compare like with like
The scope, specification and quality of contractor should be broadly comparable.
Deal with outliers sensibly
If one quotation is dramatically higher or lower, ask why. There may be a legitimate difference in scope or method.
Proportionality
For a very small repair, obtaining three formal quotes may create more effort than value. Use judgement.
Key takeaway
The purpose of quotations is to establish a reasonable repair cost, not to create paperwork for its own sake.
This page provides general information about the Party Wall etc. Act 1996 and common practice. It is not legal advice and does not replace advice on the facts of a particular matter.