Quote vs Estimate: What's the Difference in the UK?

A quote is generally a fixed price for an agreed piece of work. An estimate is an approximate cost that may change as the details become clearer. For UK tradespeople, the difference matters: it affects what your customer expects to pay, the pricing risk you take on and how you handle unexpected work.

The name at the top of the document is not everything. What you have actually promised, what the price covers and what the customer agrees to are just as important.

Quote vs Estimate: The Key Differences

For a straightforward job you have already inspected, a quote is often the clearest option. For a renovation where hidden damage might substantially affect the cost, an estimate may be more appropriate until you can assess the work properly.

What Is a Quote?

A quotation is an offer to complete specified work for a stated price. Once it is accepted and a contract is formed, you generally cannot raise the price simply because the job takes longer than you expected or your materials cost more.

Suppose you quote to remove old mortar and repoint an identified section of brickwork. If the joints take longer to rake out than you allowed, that is usually your costing problem, not an automatic extra charge to the customer. But replacing damaged bricks may be additional work if it was clearly excluded from the original agreement.

A good building quote therefore needs more than a total. State the work included, materials and finish, access arrangements, exclusions, VAT treatment, payment terms and how any additional work will be agreed. Our guide to writing a professional building quote covers the document in more detail.

What Is an Estimate?

An estimate is your informed assessment of what a job is likely to cost. It is useful when you cannot yet confirm the quantities, site conditions or full specification.

For example, a customer may ask for a renovation price before the existing floor has been lifted. You can estimate the visible work while explaining that any rotten joists or other concealed defects will require a separate assessment. Ideally, give a sensible cost range or outline the rates and assumptions behind your figure rather than offering a number with no explanation.

An estimate is not permission to charge whatever you like. You still need to honour the agreement you make with the customer. If your final bill is significantly higher, you should be able to explain what changed and why the charge is justified.

When Should You Give a Quote Instead of an Estimate?

Use a Quote When You Can Define the Job

A fixed quote makes sense when you have inspected the site, confirmed the customer's requirements and can cost the labour, materials and access with reasonable confidence. Examples include a measured repointing job, a specified garden wall or a clearly defined repair.

Before committing, account for labour, waste, overheads and profit, not just materials. See our guide to pricing a building job for the costing steps.

Use an Estimate When Significant Details Are Unknown

An estimate can be useful early in a project, while the customer is choosing materials, before you can measure the area or when hidden conditions could change the work substantially. Spell out those uncertainties. A vague warning that “prices may vary” is far less useful than identifying exactly what is not yet known.

Once you have enough information, you can replace the estimate with a fixed-price quote. Give the quote its own reference, state which estimate it supersedes and ask the customer to accept the updated scope and terms.

Are Quotes and Estimates Legally Binding in the UK?

Whether there is a binding contract depends on what the parties have agreed, not simply whether a document says “quote” or “estimate”. The following is general information for UK tradespeople, not legal advice on a particular dispute.

When Does a Quote Become Binding?

If you make a clear offer to carry out defined work and the customer accepts it, that will generally form a contract, assuming the other legal requirements are met. Acceptance does not always require a signature. A clear email, text message or verbal agreement may be enough, although written records are much easier to prove later.

Citizens Advice explains the distinction between quotes and estimates and why a customer normally should not be charged above an accepted quote for the same work. It also notes exceptional circumstances, such as an obvious pricing mistake. Do not assume a simple costing error entitles you to increase your price.

Can an Estimate Still Form Part of a Contract?

Yes. Agreeing to proceed on an estimated price can still create a contract. The estimate, what you said about it and any agreed hourly rates or method for calculating the final amount all matter.

For consumer work, section 50 of the Consumer Rights Act 2015 can make information supplied about the service part of the contract when the consumer relies on it in relevant decisions, subject to the Act's qualifications. Be clear about exclusions and assumptions before the customer agrees.

What if No Final Price Was Agreed?

Where a consumer service contract does not fix a price, provide a way to calculate it or otherwise establish one through relevant information, section 51 of the Consumer Rights Act 2015 requires the customer to pay a reasonable price, and no more. What is reasonable depends on the facts of the job. The Act also requires services to be carried out with reasonable care and skill.

Consumer protection rules may impose additional obligations when a contract is made at a customer's home or at a distance, including information and cancellation requirements. Check the applicable Consumer Contracts Regulations 2013, particularly if the customer wants work to start soon after accepting.

Quote vs Estimate: A Repointing Example

Imagine a homeowner asking you to repoint around 40 m² of external brickwork. The following amounts are purely illustrative, not suggested market prices; both examples assume any applicable VAT is included.

Example of a Fixed-Price Quote

Fixed quotation: £8,000 total. Rake out existing mortar and repoint approximately 40 m² of the agreed front elevation using the specified mortar and finish. Price includes access scaffolding, surface protection and waste removal. Brick replacement and structural repairs are excluded. Any additional work will be priced and agreed separately before proceeding.

After inspection, you are committing to the defined repointing work at that price. Taking longer than expected to complete the included work does not automatically justify charging more.

Example of an Estimate

Estimated cost: £7,000–£9,000 total. Preliminary allowance to rake out and repoint approximately 40 m² of the front elevation. The final price is subject to confirming access requirements, joint condition and any damaged brickwork during inspection. Work outside the agreed scope will be assessed and its cost discussed with the customer before it is carried out.

The estimate makes the uncertainty visible. It does not guarantee that every possible cost is covered, but neither should it be treated as a blank cheque. For the practical costing considerations, see how to price a repointing job.

The same principle applies when you quote for a brick garden wall: define the wall construction and distinguish it from unverified foundations or ground conditions.

What Should You Include in a Quote or Estimate?

Whether your price is fixed or approximate, your customer should be able to see what they are paying for. Include the following where relevant:

• Customer and job details: names, site address, document date and reference number.
• Description of the work: measurements, materials, finish and any drawings or specifications.
• Inclusions and exclusions: access, preparation, waste removal, making good and any specialist work not allowed for.
• Itemised costs: labour, materials and other charges where useful.
• VAT: whether VAT applies and the total the customer will pay.
• Assumptions and provisional sums: what remains unknown and how those costs will be confirmed.
• Terms: offer expiry, deposits, payment stages, expected timing and how acceptance or changes will be recorded.

A provisional sum is an allowance for work that has not yet been fully defined. If you use one, explain what it covers and how any adjustment will be calculated and agreed. Labelling the whole document “fixed price” while leaving important costs open can easily cause confusion.

What Happens if the Work or Price Changes?

The first question is whether the new cost relates to additional work or simply to underpricing the original work. A customer asking you to build another section of wall is a scope change. Taking an extra day to build the wall already included in your fixed quote is normally a costing issue.

When hidden damage appears, check the quote's assumptions and exclusions before treating it as an extra. Then follow a simple variation process:

1. Explain what has changed and why the additional work may be needed.
2. Provide the extra cost or credit, including VAT, and any effect on the programme.
3. Get the customer's agreement before carrying out chargeable additional work, and keep a record of the approval.

Photographs, messages and an updated quotation can all help. If a discovery creates an immediate safety risk, take appropriate steps to make the site safe and contact the customer promptly, distinguishing urgent safety action from further remedial work.

Creating a Clear, Professional Building Quote

A clear quote is easier to understand, compare and accept. It also gives you a record to refer to if a customer asks for changes later.

Once you have worked out your labour and material costs, Quote Forge lets you build an itemised quotation, reuse saved line items and generate a branded PDF to send to your customer. It is designed to help with the quotation document itself, not to replace your site assessment or calculate the correct price for you.

If you want to spend less time putting quotes together, take a look at Quote Forge's pricing and trial options.

Frequently Asked Questions

Can a Customer Accept a Quote by Text Message?

Yes. A clear text message can amount to acceptance and help form a contract. Keep it alongside the exact quote and terms the customer received.

Can You Charge More Than a Fixed Quote?

Not usually for the same agreed work merely because your costs increased. A separately agreed variation or another legally valid reason may change the position. Citizens Advice also identifies obvious pricing mistakes as a possible exception.

How Much Can a Final Bill Exceed an Estimate?

There is no universal percentage by which every estimate can be exceeded. The answer depends on the contract, the agreed way of calculating the price, what changed and what is reasonable in the circumstances.

Is an Estimate Legally Binding?

An estimate is not normally a promise to complete the job for that exact amount, but it can still form part of a binding agreement. Make its assumptions, limitations and charging method clear before work begins.

How Long Is a Quote Valid For?

You can specify how long your offer remains open, for example by giving an expiry date. Once a contract has been formed, the original expiry date does not by itself allow you to change the agreed price.