Why do builder quotes vary so much for the same job?

Usually because they are not actually quoting the same job. One builder includes scaffolding, making good, and Building Regs fees; another excludes them. One prices a premium specification; another assumes a basic one. Add genuine differences in insurance, warranty, day rates, and how busy each builder is, and a 30–50% spread on the same brief is common. The headline totals are rarely comparable until you normalise the scope.

Should I just choose the cheapest quote?

Not on the headline figure alone. The cheapest quote is often the one with the most excluded, which means the gap reappears later as variations and extras. A quote that is 30% below the others is usually missing scope, mispricing materials, or planning to charge for the difference once you are committed. Compare what each quote includes, add the missing items back, and only then decide.

Is the most expensive quote a rip-off?

Not necessarily. The dearest quote may include items the others left out, price a higher specification, or carry real costs the others do not, such as proper insurance and a genuine warranty. It can also simply be overpriced. The way to tell is a line-by-line comparison on a like-for-like scope, not a glance at the totals.

How do I compare quotes fairly?

Put them on a like-for-like footing. Write down a single, specific scope of work, send the same scope to every builder, and ask each to itemise labour, materials, and exclusions against it. When all three price the same defined job in the same format, the differences that remain are real, and you are comparing prices rather than guesses.

How many quotes should I get?

Three is the usual recommendation, because two leaves you with no sense of the middle and one gives you nothing to compare against. If you can only get two, an independent price check on the scope can stand in for the third opinion, telling you whether the figures sit in the fair UK range for your area.

Why are my three builder quotes so different?

Why UK builder quotes for the same job can vary by thousands, how to tell a genuine difference in scope or quality from simple overpricing, and how to put quotes on a like-for-like footing before you choose.

A homeowner discussing a building quote with a contractor. — Photo by LinkedIn Sales Solutions on Unsplash

You ask three builders for a price on the same job and the quotes come back at £18,000, £24,000, and £31,000. It is a normal spread, and it is also bewildering, because the natural assumption is that the same work should cost roughly the same amount. The reason it does not is that the three builders are almost never quoting the same job, even when they have read the same brief.

This guide explains why quotes diverge, how to tell a genuine difference from overpricing, and how to put quotes on a footing where the totals actually mean something.

They are not quoting the same job#

The single biggest cause of variation is scope. Unless you gave every builder an identical, specific brief, each has made their own assumptions about what is included:

One includes scaffolding, skip hire, making good, and Building Regs fees; another excludes all of them. (See the 15 hidden costs.)
One prices a premium specification; another assumes the basic version of every choice.
One includes decoration and flooring; another leaves the room "ready for finishing."

Before any quote can be compared, you have to know what each one contains. The totals are not comparable until then.

Genuine differences in quality and cost#

Even on identical scope, fair quotes differ for real reasons:

Specification. Better materials and finishes cost more. A quote built around mid-range units and one built around premium units are both honest, and they are hundreds or thousands apart.

Insurance and warranty. A builder carrying proper public liability cover and offering an insurance-backed guarantee has costs a cash-in-hand operator does not. That difference shows up in the price, and it protects you.

Day rates and productivity. Regional day rates vary, and a faster, more experienced team at a higher rate can cost less overall than a cheaper, slower one. The lowest day rate is not the lowest total. See what is a fair builder’s markup.

How busy they are. An established builder with a full book prices high because they do not need the work. That is a high price, not an unfair one.

When a difference is just overpricing#

Sometimes the outlier is simply too expensive. The signals are the same as for any inflated quote: a large gap with no premium specification, included items, or warranty to justify it; a margin well above the normal band; or a lump sum with no breakdown that hides where the money goes. For the full set, see how to tell if a quote is too high.

The cheap outlier deserves the same suspicion as the expensive one. A quote 30% below the others is rarely a bargain the others missed; it is usually missing scope that returns later as variations.

How to put quotes on a like-for-like footing#

The fix is to remove the guesswork before you ask for prices:

Write one specific scope of work. List the rooms, the work, the materials, and the finishes you expect, in detail.
Send the same scope to every builder. Now they are all pricing the same job.
Ask each to itemise. Labour, materials, and an explicit exclusions list, in the same format.
Normalise what remains. Add any excluded items back to the quotes that left them out, at a sensible figure.
Then compare. The differences that survive this process are real, and now you are comparing prices rather than assumptions.

If you can only get two quotes#

Three is the usual advice, but good builders are busy and a third quote is not always available. Two quotes plus an independent check on the scope can stand in for the third opinion: it tells you whether the two figures sit inside the fair UK range for your area, which is the thing the third quote was there to reveal.

That is what Check the Quote does. Paste or upload a quote and we check every line against current UK market rates for your postcode, flag what is above the fair range, and tell you what is missing from the scope, so two quotes plus a check can be enough to decide with confidence. Your first check is free.

Got a quote you want checked?

Paste any UK contractor quote and Check the Quote compares every line item against current market rates, flags missing scope, and runs a Companies House check on the contractor. Free on your first project.

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Frequently asked questions

Why do builder quotes vary so much for the same job?: Usually because they are not actually quoting the same job. One builder includes scaffolding, making good, and Building Regs fees; another excludes them. One prices a premium specification; another assumes a basic one. Add genuine differences in insurance, warranty, day rates, and how busy each builder is, and a 30–50% spread on the same brief is common. The headline totals are rarely comparable until you normalise the scope.
Should I just choose the cheapest quote?: Not on the headline figure alone. The cheapest quote is often the one with the most excluded, which means the gap reappears later as variations and extras. A quote that is 30% below the others is usually missing scope, mispricing materials, or planning to charge for the difference once you are committed. Compare what each quote includes, add the missing items back, and only then decide.
Is the most expensive quote a rip-off?: Not necessarily. The dearest quote may include items the others left out, price a higher specification, or carry real costs the others do not, such as proper insurance and a genuine warranty. It can also simply be overpriced. The way to tell is a line-by-line comparison on a like-for-like scope, not a glance at the totals.
How do I compare quotes fairly?: Put them on a like-for-like footing. Write down a single, specific scope of work, send the same scope to every builder, and ask each to itemise labour, materials, and exclusions against it. When all three price the same defined job in the same format, the differences that remain are real, and you are comparing prices rather than guesses.
How many quotes should I get?: Three is the usual recommendation, because two leaves you with no sense of the middle and one gives you nothing to compare against. If you can only get two, an independent price check on the scope can stand in for the third opinion, telling you whether the figures sit in the fair UK range for your area.

Last updated: 22 May 2026

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