Why is one builder’s quote so much higher than the others?

You ask three builders for the same job. Two come back close together, and the third is hundreds, sometimes thousands, more. The instinct is to assume the outlier is trying it on. Sometimes that is exactly right. Just as often, the expensive quote is the only one pricing the whole job, and the cheap two have quietly left things out that you will pay for later.

The headline total tells you almost nothing on its own. Here is how to work out which kind of "expensive" you are looking at.

The legitimate reasons a quote is higher#

Rule these in before you object:

• It includes more. The dearest quote may price scaffolding, skip hire, making good, and Building Regs fees that the cheaper two excluded. Compare what each total actually covers, not just the number. See hidden costs in builder quotes.
• A better specification. Higher-grade materials, better fittings, a more durable finish. That is a different product, not the same job at a higher price.
• Proper insurance and a real warranty. An insurance-backed guarantee and full public liability cover cost the builder money, and that shows up in the price.
• Employed labour, not cash-in-hand. Properly employed, insured trades cost more and protect you more.
• A busy, established builder. Trades in demand price high because they do not need the work. That is a high price, not an unfair one.
• Genuinely awkward access. If one builder has spotted a real difficulty the others missed, their higher price may be the realistic one.

The signs it is overcharging instead#

The same high number is a problem when there is nothing behind it:

• Same scope, bigger margin. The itemised breakdown shows the identical job, just a larger gap between raw cost and total, with no premium spec to explain it. See what is a fair markup.
• No breakdown at all. A lump sum that is far above the others and refuses to itemise is hiding why.
• Rates above the regional norm. The labour days times the rate, or the per-m² figure, sits well above normal for your area.
• Padded materials. A materials figure well above merchant prices for the same items.

How to tell them apart#

1. Get every quote itemised. You cannot compare totals that cover different things. Ask each builder for a breakdown of labour, materials, and exclusions.
2. Line the scopes up. Note what the expensive quote includes that the cheap ones do not. Often the gap closes the moment you add the missing items back into the cheaper quotes.
3. Ask the dear builder directly. "Your price is higher than the others, what does it include that theirs might not?" A good builder will answer this clearly. Evasion is its own answer.
4. Check the cheap ones too. A quote far below the others is as much a flag as one far above. It usually means something has been left out.

See why are builder quotes so different for more on the normal spread between quotes.

Don’t rule out the expensive quote by reflex#

The cheapest quote is the one that most often grows. It looks cheap because it is incomplete, and the missing items return as variations and extras once work starts. The expensive quote is sometimes simply the honest one. The goal is not to find the lowest number. It is to find the quote that prices the whole job at a fair rate, then pay that.

The shortcut#

Comparing itemised quotes properly means knowing the going labour and materials rates for your area. Check the Quote does that for you: paste or upload the quotes and we check each line against current UK rates for your postcode, show you what is driving the gap, and flag anything above the fair range or missing entirely. Your first check is free. See also how to compare builder quotes.