Choosing the right builder is the biggest decision you’ll make on an extension, loft conversion, or renovation. The wrong choice can cost you time, money, and stress. Use this checklist to protect yourself before you sign anything.
Quick rule
If a quote is dramatically cheaper than the rest, it’s usually because something is missing — not because you’ve found a bargain.
1) Company checks
2) Quote checks
A professional quote should be clear, itemised, and specific. Watch out for vague wording.
3) Questions to ask
Who will manage the job day-to-day?
You want one named person responsible for communication and quality.
What’s your payment schedule?
Stage payments linked to progress are standard. Avoid large upfront deposits.
How do you handle changes/variations?
Changes should be agreed in writing with cost/time impact before work continues.
What’s your expected timeline?
A realistic programme with key milestones is a good sign.
4) Red flags
Pressure to sign quickly or ‘today only’ pricing
No written contract or vague terms
Large upfront deposit requests
Refuses to show insurance certificates
Won’t provide references or recent project photos
Avoids talking about Building Control / compliance
Want a second opinion on a quote?
Send us your drawings (if you have them) and we’ll give you an honest, itemised quote — free and no obligation.