Why the cheapest quote is often a trap
A quote that is 30–40% cheaper than two others is not a bargain — it is a warning sign. The low bidder is either planning to use cheaper materials, cutting corners on preparation and finish, intending to add costs later through variations, or simply underestimating the job and planning to walk off it. In every case, you pay more in the long run.
What should be in a builder's quote?
A good quote should specify: a full description of the work to be done, materials to be used (brand, type, and quantity), what is included in the price (e.g. making good, disposal of waste), what is excluded, the programme (start date and expected duration), payment schedule, and confirmation of insurance and registrations. A single-line quote with just a total price tells you almost nothing.
Comparing like with like
Before comparing prices, ensure the quotes cover identical work. One builder may include scaffolding; another may not. One may specify quality materials; another budget alternatives. When comparing three quotes, list every line item and check that all three are pricing the same specification. Often the most expensive quote covers more than the cheapest.
The payment schedule red flag
A builder who asks for more than 25% deposit before starting work is a red flag. Standard practice is a small deposit (10–20%) before start, stage payments at agreed milestones, and a retention (5–10%) held until the snagging list is resolved. Never pay the full amount until you are satisfied the work is complete and correct.