What is the difference between a quote and an estimate?

A quote is a fixed, legally binding price for a defined scope of work. Once a customer accepts a quote, the tradesman is contractually obliged to complete the work at that price. An estimate is an approximate cost based on the information available at the time. It is not legally binding and can change as the job progresses.

Is a quote legally binding UK?

Yes. In the UK, an accepted quote forms a legally binding contract. The tradesman must complete the work at the quoted price unless the scope changes. If a tradesman charges significantly more than a written quote without agreeing a variation first, the customer has grounds to dispute the additional cost.

Is an estimate legally binding UK?

No, an estimate is not legally binding in the UK. It is an approximate figure and can change. However, under the Consumer Rights Act 2015, any charges above an estimate must be reasonable. A tradesman cannot multiply an estimate by ten and expect it to go unchallenged.

Can a tradesman charge more than a quote?

Generally no, not without the customer's written agreement. A formal quote, once accepted, is a binding price for that scope of work. A tradesman can only charge more if the scope changes (for example, additional hidden damage is discovered), provided they inform the customer and agree a variation in writing before doing the extra work.

Can a tradesman charge more than an estimate?

Yes, within reason. An estimate is approximate and can increase if the work proves more complex. However, under the Consumer Rights Act 2015, the final charge must be reasonable relative to the estimate. Significant overruns without explanation or customer agreement can be challenged.

What should a formal quote include?

A formal quote should include: your business name and contact details, the customer's name and address, a detailed description of all work to be carried out, a full price breakdown (labour and materials), VAT information if you are VAT registered, payment terms, an expiry date (usually 30 days), and a clear list of exclusions.

How long is a quote valid for?

There is no legal requirement on quote validity in the UK, but most tradesmen specify 30 days. Material prices fluctuate and your availability changes, so it is sensible to set an expiry date on every quote. If a customer comes back to accept a quote after the expiry, you are entitled to reprice.

Quote vs estimate vs tender: what's the difference?

A quote is a fixed price offer. An estimate is an approximate cost. A tender is a formal, competitive bid usually submitted in response to a specification document, common in commercial and public sector work. Tenders typically involve more detailed documentation, a structured submission process, and evaluation criteria beyond just price.

Quote vs Estimate: What's the Difference? (And Which Should You Use?)

Most homeowners use "quote" and "estimate" as if they mean the same thing. They do not. For tradesmen working in the UK, the difference between the two is legally significant and practically important. Getting it wrong can cost you money, create disputes, and in some cases expose you to legal liability.

This guide covers everything you need to know: the legal definitions, when to use each one, how to write them properly, and real examples of what can go wrong.

What is a Quote?

A quote is a fixed price offer for a clearly defined scope of work. Once a customer accepts a quote, it becomes a legally binding contract under UK contract law. You are obliged to complete the work at the quoted price, and the customer is obliged to pay it.

This legal weight cuts both ways. The customer has certainty. You cannot increase the price after the fact, unless the scope of work changes and you agree a variation in writing first.

Use a quote when:

You have fully assessed the job (ideally after a site visit)
The scope of work is clear and well defined
You are confident in your material and labour costs
The customer wants price certainty before committing
The job is straightforward and unlikely to throw up surprises

Examples: fitting a new bathroom suite, replacing a boiler, plastering a room, installing a consumer unit, laying a patio.

What is an Estimate?

An estimate is your best approximation of what a job will cost, based on the information available at the time. It is not a fixed price. It is not legally binding. It can and does change as the work progresses and the full scope becomes clear.

Under the Consumer Rights Act 2015, estimates must still be reasonable. You cannot give someone a ballpark figure of £500 and then invoice them for £4,000 without explanation. Any increase above the estimated figure should be reasonable in the context of the work done.

Use an estimate when:

You cannot fully assess the work upfront (for example, there may be hidden damage behind a wall)
The scope of work is uncertain or likely to expand
You are providing a rough ballpark to help the customer budget
The customer has not yet committed and wants a rough idea before a site visit

Examples: diagnosing an intermittent electrical fault, investigating a rising damp problem, assessing a roof where you cannot see the full extent of damage.

When to Use Each One: Detailed Scenarios

Scenario 1: Bathroom refit

You visit the site, measure everything, look at the plumbing layout, and confirm the customer's chosen suite. You know what materials cost and how long it will take. Use a quote. You have everything you need to give a fixed price with confidence.

Scenario 2: Investigating a damp problem

A customer wants you to investigate and fix a damp patch in their living room. Until you open up the wall, you do not know whether it is a condensation issue, a leaking pipe, failed render, or a serious structural problem. Use an estimate, and make it clear in writing that the final price depends on what you find once you start the investigation.

Scenario 3: Re-wiring an old property

A rewire on a 1930s terrace with original wiring is a known scope but with inherent risk of hidden complications. Most electricians use a quote here but build in a contingency and include clear exclusions (for example, making good plaster after chasing, or dealing with any asbestos found behind boards).

Scenario 4: Emergency plumbing repair

A customer calls with a burst pipe. You cannot assess the damage until you arrive. Give an estimate over the phone based on what the customer describes, then reassess on site.

What Happens If You Use the Wrong One?

Using a quote when you should have used an estimate can leave you out of pocket. If you quote a fixed price and the job proves significantly harder than expected, you absorb the loss. The customer has a contract at that price.

Using an estimate when the customer thinks it is a quote is more dangerous in the opposite direction. If you verbally discuss a price and the customer believes it is fixed, and then your invoice comes in substantially higher, you are likely heading into a dispute. The customer may refuse to pay the full amount. If it goes to small claims court, a judge will consider what a reasonable person would have understood the communication to mean.

The lesson: always put it in writing, label it clearly as either a Quote or an Estimate, and explain the difference to the customer before they make a decision.

How to Write a Proper Quote

A formal quote should include the following:

Your business details: Name, address, phone, email
Customer details: Name and address of the property
A unique quote reference number
Date issued and expiry date (30 days is standard)
Detailed scope of work: List every task you are quoting for. Be specific.
Full price breakdown: Separate labour and materials where possible
VAT information: State clearly whether prices include or exclude VAT
Exclusions: List anything that is specifically not included
Variation clause: State that any additional work not covered by this quote will be priced separately and agreed in writing
Payment terms: When payment is due and how

The exclusions section is one of the most important parts of any quote. Common exclusions for tradespeople include making good after chasing (plastering over cable runs or pipe holes), removal of hazardous materials such as asbestos if found, structural repairs discovered during works, and any work required by building control that was not anticipated at time of quoting.

How to Write a Proper Estimate

An estimate needs to protect you clearly. As well as the standard details (your name, the customer's address, date), it should include:

A clear label: Call it an "Estimate" at the top, not a "Quote"
A written explanation: State explicitly that this is an approximate figure and the final cost may vary
The basis of the estimate: Explain what it is based on (for example, based on site visit on [date], assuming no structural damage behind the affected area)
What would change the price: List the specific things that could cause the cost to increase
A realistic range if possible: For example, "We estimate this will cost between £800 and £1,400 depending on what we find behind the plasterboard"
Your update process: State that if the actual scope looks likely to exceed the estimate, you will contact the customer before proceeding

The Difference for VAT-Registered Tradespeople

If you are VAT registered, your quotes and estimates must clearly state whether prices include or exclude VAT. Failing to do this creates confusion and potential disputes.

The standard approach is to show the net price, add 20% VAT separately, and show the total inclusive amount. For example: Labour £400 + VAT £80 = £480 total.

For domestic customers who are not VAT registered themselves, showing prices inclusive of VAT is often cleaner. For commercial customers and other businesses who can reclaim VAT, showing ex-VAT prices is standard.

If a customer accepts a quote shown ex-VAT and then objects to the VAT on the invoice, you are legally entitled to charge it provided your quote clearly stated the price was exclusive of VAT. This is why clarity on the quote document matters.

Quote vs Estimate vs Tender

For completeness, a tender is a formal, competitive bid submitted in response to a detailed specification document. Tenders are common in commercial construction, local authority contracts, and public sector work. They typically involve a structured submission process, defined evaluation criteria, and legal obligations around the tendering process itself.

For most tradespeople working on domestic and small commercial jobs, the choice is simply between a quote and an estimate. Tenders become relevant when you start working for larger contractors, housing associations, or public bodies.

Real-World Examples

Example 1: Quote done right

A plumber visits a property to assess a bathroom refit. After the site visit, they send a written quote with the following: Labour 3 days at £250 per day = £750. Materials (toilet, basin, bath, taps, fittings) = £680. Waste disposal = £80. Total = £1,510 + VAT. Valid for 30 days. Excludes any electrical work, tiling, or plastering. Excludes any repairs required if existing pipework found to be non-compliant.

The customer accepts. The job is done. The invoice matches the quote. No dispute.

Example 2: Estimate done right

A builder is asked to investigate and repair a damp patch in a ground floor extension. They cannot see behind the walls. They send a written estimate: "Based on our site visit on 12 March, we estimate the investigation and repair will cost between £600 and £1,200. This range reflects the uncertainty around whether the cause is superficial render failure (lower end) or a more significant issue with the DPC or drainage (higher end). We will contact you before proceeding if we believe costs will exceed £1,200."

The customer knows what to expect. If it comes in at £950, no one is surprised.

How Jobnix Helps

With Jobnix, you can create professional, detailed quotes and estimates from your phone in under two minutes. Every document includes your branding, a clear scope breakdown, automatic exclusion clauses, and payment terms. Your customer receives a clean PDF they can accept with a single tap, and you get a notification the moment they do. No more scribbled prices on the back of a receipt.

Jobnix also keeps a full record of every quote and estimate you have ever sent, which is invaluable if a dispute ever arises.

Once you have the format right, the next step is making sure your quotes actually win work. Read our guide to the 5 quoting mistakes that are losing you jobs, and learn how to follow up on quotes that haven't been accepted to recover jobs you thought were gone.