Why the most expensive mistakes in home extensions cost six times more to fix than to prevent.
A fifteen-minute read drawn from forty years of UK practice and a personal archive of around 4,500 planning applications. Free.
A homeowner in Coventry wanted a simple loft conversion. One rear rooflight, no dormer, no change to the roof line. The builder, correctly, told him planning permission was not needed. The job started.
On day two, the neighbour appeared at the fence. The steel beams supporting the new loft floor were bearing on the party wall — and that triggers a separate notification process the homeowner is liable for. Not the builder.
Works halted. Solicitors. Party wall surveyors for both sides, both paid by the homeowner. Total cost: £3,000.
Done correctly before the build started, a Party Wall Notice would have cost around £500.
Six times cheaper to do it right than to fix it after. That ratio holds consistently enough across extension projects to have a name.
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It covers three real cases where the same ratio held — the specific questions that would have changed each outcome, and how to ask them before your project starts.
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The Extension Handbook is built on forty years of UK practice and a personal archive of around 4,500 planning applications. The cases are real and anonymised. The figures are real.