When a builder, plumber, or any other trader gives you a price for work, that price is either a quote or an estimate — and the difference between the two is far more significant than most homeowners realise. Getting this wrong can leave you legally exposed or facing a bill that is hundreds or even thousands of pounds higher than you expected.
What Is a Quote?
A quote (also called a quotation) is a fixed, binding offer to carry out specific work for a stated price. Once you accept it in writing, the trader is contractually obliged to complete that work for the agreed sum. They cannot charge more unless:
- You change the scope of work (a “variation”)
- Unforeseen conditions arise that could not reasonably have been anticipated (for example, discovering rotten joists once floorboards are lifted)
- The quote explicitly states it will be adjusted for materials price changes beyond a certain threshold
In practice, reputable traders will document any variation before the extra cost is incurred, ideally with a written change order you both sign.
What Is an Estimate?
An estimate is an approximate indication of likely cost. It is not a fixed price. The final bill can — and often does — differ from the estimate, sometimes substantially. The Consumer Rights Act 2015 requires that where a price has been quoted, consumers pay no more than the quoted price. Where only an estimate has been given, the final charge must still be “reasonable” relative to the estimate, but there is no hard ceiling.
The word “estimate” should set off a mental alarm: ask the trader to clarify the basis, what contingencies they have allowed for, and how variations will be handled.
Key Differences at a Glance
| Feature | Quote | Estimate |
|---|---|---|
| Binding on the trader? | Yes, once accepted | No |
| Can the price increase? | Only via agreed variations | Yes, within reason |
| Best for | Well-defined, measurable jobs | Complex or exploratory work |
| Typical document | Formal quotation letter / breakdown | Email or verbal figure |
| Your protection | High — Consumer Rights Act 2015 | Moderate — final charge must be “reasonable” |
| When to ask for it | New extension, kitchen, bathroom, roof replacement | Strip-out, investigation works, major structural repairs |
When You Will Get an Estimate Rather Than a Quote
Trades will usually only offer an estimate when the full scope genuinely cannot be known upfront:
- Damp investigation and repair: the extent of damage behind plaster cannot be known until the plaster is off.
- Drainage repairs: CCTV surveys may reveal more problems than expected.
- Rewiring older properties: the condition of existing wiring and the number of remediation points cannot always be seen.
- Underpinning: the depth and extent of foundation failure is uncertain until excavation begins.
In these cases, ask the trader to break the estimate into a fixed-price phase (the investigation) and a second quotation once the full scope is clear. This is standard practice on well-run jobs.
How to Get a Proper Quote
- Define the scope precisely before approaching traders. Vague briefs produce vague prices. Provide drawings, specifications, or at minimum a detailed written brief.
- Request quotes from at least three traders. This gives you a market benchmark and uncovers wildly high or low outliers.
- Ask explicitly: is this a quote or an estimate? If they say quote, ask whether it is fixed or subject to any caveats.
- Insist on a written breakdown. A single lump sum offers no protection if a dispute arises. A good quote will separate labour, materials, plant hire, and any allowances or provisional sums.
- Understand provisional sums. A provisional sum is a budget allowance for an item whose cost cannot yet be fixed (for example, floor tiles chosen by the client). These are expected to change and are not binding.
- Agree how variations will be managed. A contract should state that no extra work is to be instructed without a written variation order signed by both parties before the work begins.
Typical Cost Ranges for Common UK Renovation Jobs (2026)
| Job | Typical Quote Range |
|---|---|
| Kitchen supply and fit (mid-range) | £8,000 – £20,000 |
| Bathroom refurbishment | £4,000 – £12,000 |
| Single-storey rear extension (per m²) | £2,200 – £3,500/m² |
| Loft conversion (dormer, London) | £55,000 – £90,000 |
| Full rewire (3-bed semi) | £4,500 – £8,000 |
| New boiler supply and installation | £2,200 – £4,500 |
These are illustrative ranges. Your actual quote will depend on specification, location, and site conditions.
Red Flags to Watch For
- A trader who gives you a quote verbally only and refuses to put it in writing.
- A quote with no breakdown — just a total figure.
- Prices that are dramatically below the market range (often a sign the trader will seek to recover margin through variations).
- No mention of how variations will be priced or approved.
- Pressure to sign quickly or start before you have read the documents carefully.
What the Law Says
Under the Consumer Rights Act 2015, services must be performed with reasonable care and skill and at a reasonable price if no price was agreed in advance. The Act also gives consumers the right to require repeat performance of substandard work. If a fixed quote was agreed and the trader charges more without your agreement, you are entitled to pay the quoted price only.
For B2B contracts (if you are buying as a business rather than a consumer), different rules apply under the Sale of Goods Act 1979 and common contract law, but the fundamental principle — that a quote is an offer capable of acceptance — holds.
Getting the Best Outcome
The simplest protection is to treat every price you receive with equal suspicion until you understand whether it is fixed or approximate. Ask the question directly. Put everything in writing. And before work begins, make sure you have a signed document — however brief — that states the price, the scope, and what happens if the scope changes.
A trustworthy trader will have no problem providing this. One who pushes back or gets vague is telling you something important.
