Phase 2 · Pre-Construction · Task 01 of 11
How to Find a Reliable Builder for Your Extension
Where to find builders, what to ask them, and the red flags that save you from a costly project going wrong. Practical vetting guide for UK homeowners.
Prerequisites
Complete these first
The builder you choose will determine whether your extension is a manageable six-month project or an eighteen-month ordeal. Not your architect, not your structural engineer, not your planning authority. Your builder. They control the pace, the quality, the subcontractors, and ultimately the cost. Projects that start at £45,000 and finish at £120,000 are not rare outlier stories. They happen because homeowners picked a builder too quickly, didn't ask the right questions, and didn't check the things that needed checking.
This guide is about reducing that risk. Not eliminating it (no amount of vetting makes a building project risk-free) but stacking the odds in your favour before you hand someone a deposit cheque and the keys to your back garden.
Do this first
Before you start looking for builders, two things should already be done. Your building control application should be submitted (ideally conditionally approved), and you should have read budgeting and contingency so you understand the full cost picture. A builder's quote covers their structural work only, not your total project spend. Knowing this before you compare quotes stops you making decisions based on incomplete numbers.
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