What Should a Builders Quote Include?

If you are searching for “what should a builders quote include”, you are probably trying to work out whether the price in front of you is clear, fair and complete. That is not always easy. Building quotations vary hugely in format: one builder may give you a two-page breakdown, while another may send a single total by text or email.

The problem is that the cheapest quote is not always the best value, and the most detailed quote is not automatically the safest. What matters is whether the quote explains exactly what is included, what is excluded, how uncertain costs will be handled, and what happens if the job changes once work starts.

A good builders quote should help you understand the work before you commit. It should reduce the risk of disputes, unexpected extras and awkward conversations later. This guide explains what to look for, what to challenge, and how to compare quotes properly before signing anything.

Common mistakes

Accepting a lump-sum price with no detail. A quote that simply says “extension works: £42,000” gives you very little protection. It does not tell you whether foundations, drainage, steels, plastering, decorating, skips, scaffolding, Building Control fees or VAT are included. If something is missing, you may only discover it after work has begun.

Assuming every builder has priced the same specification. If you send three builders a drawing and ask for a price, they may each make different assumptions. One may include rooflights, another may allow for basic windows, and another may exclude kitchen fitting entirely. Unless the quote states the specification clearly, you are not comparing like with like.

Ignoring provisional sums and allowances. Provisional sums and prime cost allowances can be useful, but they are also common sources of budget creep. For example, a quote may allow £1,200 for bathroom fittings, but the products you choose may cost £2,000. If the allowance is too low or vague, the quote can look cheaper than it really is.

Not checking VAT. Some quotes show VAT separately, some include it in the total, and some do not mention it at all. If VAT applies and is not included in the total you have budgeted for, the final cost can change significantly. A clear quote should state whether VAT is included, excluded, or not applicable.

Overlooking exclusions. Exclusions are just as important as inclusions. A builder may exclude asbestos removal, structural engineer fees, decorating, floor finishes, utility upgrades, party wall matters or planning-related costs. These exclusions are not always unreasonable, but you need to know about them before you agree the price.

Failing to agree how variations will be priced. Most projects change in some way. You may alter a layout, uncover rotten timber, or need extra drainage work. If the quote does not explain how variations will be authorised and charged, you may be left arguing over extras at the end.

Real examples

Example 1: The cheap quote that misses key items. Imagine you receive two quotes for a small rear extension. Builder A quotes £54,000. Builder B quotes £48,500. On the face of it, Builder B looks £5,500 cheaper. But Builder B’s quote excludes scaffolding, waste removal, Building Control inspection fees, decorating and final floor finishes. If scaffolding is later charged at £1,800, skips at £900, decorating at £2,400 and flooring at £2,200, the cheaper quote could quickly become more expensive than Builder A’s more complete price.

Example 2: The allowance that is too low. A bathroom refurbishment quote includes a prime cost allowance of £900 for sanitaryware and brassware. You later choose a bath, basin, WC, taps and shower fittings costing £1,650. The difference is £750 before any additional labour or delivery costs. The original quote was not necessarily dishonest, but the allowance was unrealistic for your expectations. A better quote would identify each allowance and encourage you to confirm selections before work starts.

Example 3: The vague quote that causes a dispute. A builder quotes £12,400 for “kitchen knock-through and making good”. The homeowner assumes this includes plastering, electrics, lighting relocation, decorating and fitting the new kitchen units. The builder intended to include structural opening, steel installation and basic plaster patching only. Both sides may feel they are being reasonable, but the phrase “making good” is too vague. A clearer quote would state exactly which trades and finishes are included.

What to do instead

1. Ask for a written quote, not just an estimate. A quote should be a fixed offer based on stated information, subject to any clearly listed exclusions or assumptions. An estimate is more flexible and may change. If a builder calls it an estimate, ask what would be needed to convert it into a firm quote.

2. Give every builder the same information. Send the same drawings, specification, photos, measurements, product choices and site notes to each contractor. If one builder gets more detail than another, the prices will not be directly comparable.

3. Request an itemised breakdown. The quote does not need to show every screw and bag of plaster, but it should separate major elements such as demolition, groundwork, structure, roofing, windows, plumbing, electrics, plastering, decorating, waste, scaffolding and preliminaries.

4. Check assumptions line by line. Look for phrases such as “assumed”, “subject to”, “by client”, “not included”, “provisional” and “to be confirmed”. These are not automatically red flags, but they are points to clarify.

5. Confirm VAT status in writing. Ask whether the price includes VAT, excludes VAT, or whether the builder is not VAT registered. Make sure the total you use for comparison reflects the same VAT position.

6. Challenge low allowances. If the quote includes allowances for tiles, kitchens, bathrooms, floor finishes or ironmongery, ask whether they match the products you are likely to choose. If you already know your preferred items, ask the builder to price against them.

7. Agree the payment schedule. Avoid paying a large sum upfront unless there is a clear reason, such as ordering bespoke materials. Payments should usually be linked to milestones, deliveries or stages of completed work, not vague calendar dates.

8. Ask how variations will be handled. A sensible process is: the builder identifies the change, provides a written cost and time impact, you approve it, then the work proceeds. This helps both sides keep control of the budget.

9. Check insurances, credentials and references. A quote should not be judged on price alone. Ask for public liability insurance details, relevant trade credentials where applicable, and recent examples of similar work.

10. Get an independent check if you are unsure. If you have a quote but cannot tell whether it is complete, you can use KnowMyQuote’s free Quote Health Check to spot gaps, unclear allowances and comparison issues before you commit.

What should a builders quote include line by line

A properly prepared builders quote should include enough detail for you to understand the scope, price and risk. The exact format will depend on the size of the job, but these are the core items to expect.

Builder’s details. The quote should include the business name, trading address, contact details and, where relevant, company registration number and VAT number. If the builder is a sole trader, the quote should still identify who is responsible for the work.

Client and property details. Your name, the site address and the date of the quote should be shown. This sounds basic, but it matters if you later need to refer back to a specific version.

Quote reference and validity period. Materials and subcontractor prices can change. A quote may be valid for 14, 30 or 60 days, for example. That is reasonable, provided it is stated clearly.

Description of the project. The quote should summarise the job in plain English: for example, “single-storey rear extension to form kitchen-dining area”, or “loft conversion with rear dormer and shower room”. This helps avoid confusion if you have discussed several options.

Documents used for pricing. The quote should say what it is based on: drawings, structural calculations, specification documents, site visits, emails, photographs or schedules of work. If the builder has not priced from final drawings or calculations, that should be clear.

Detailed scope of works. This is the heart of the quote. It should break down the work into logical sections. For an extension, that might include site setup, demolition, excavation, foundations, drainage, walls, steels, roof, windows and doors, insulation, first fix, plastering, second fix, decorating and external works.

Materials and specification. The quote should state key materials and standards where they affect cost or quality. For example, it should not just say “new doors” if you are expecting a particular style, finish or fire rating. For tiles, flooring, worktops, sanitaryware and fittings, it should either name the products or state a realistic allowance.

Labour and subcontractors. You do not always need a separate labour cost for every trade, but the quote should make clear which trades are included. Electrical work, plumbing, plastering, roofing and decorating are common areas where assumptions differ.

Waste removal and site management. Skips, grab lorries, protection, dust control, welfare arrangements and daily tidying can all cost money. If these are excluded, you need to know who is responsible.

Scaffolding and access. Scaffolding can be a significant cost on roofing, loft and external wall projects. The quote should say whether access equipment is included and for how long.

Building Control, planning and professional fees. Some builders include liaison with Building Control, but not inspection fees. Structural engineer fees, planning fees, party wall surveyor costs and architect fees are often separate. The quote should state this plainly.

Provisional sums and prime cost allowances. These should be listed clearly, with amounts and descriptions. A provisional sum is often used where the scope is uncertain, such as drainage alterations. A prime cost allowance is commonly used for supply items you will choose later, such as tiles or taps.

Exclusions. A good quote should include an exclusions section. It may say, for example, that asbestos removal, utility company charges, specialist surveys, loose furniture, blinds or landscaping are excluded. Clear exclusions are better than silence.

Programme and start date. The quote should give an indicative start date and duration, or explain when these will be confirmed. For larger jobs, ask for a simple programme showing key stages.

Payment terms. The quote should set out deposit requirements, stage payments, final payment, retention if agreed, and how invoices will be issued. Be wary of payment terms that get too far ahead of work completed.

Insurance and guarantees. The quote should refer to relevant insurance and any workmanship guarantee offered. If product warranties apply, ask whether they will be passed to you on completion.

Variation process. The quote should say how changes will be priced, approved and recorded. This is one of the simplest ways to prevent arguments later.

How to compare builders quotes fairly

The best way to compare quotes is to build a simple checklist. Put each builder across the top of a page or spreadsheet, then list the main work sections down the side. Mark whether each item is included, excluded, provisional or unclear.

For example, you might compare:

• demolition and strip-out
• foundations and drainage
• structural steelwork
• roofing and rooflights
• windows and external doors
• plumbing and heating alterations
• electrical work and certification
• plastering and decorating
• flooring and tiling
• kitchen or bathroom fitting
• scaffolding and waste removal
• Building Control liaison and fees
• VAT

This exercise often reveals why one quote is lower. It may be more efficient, or it may simply include less. Neither conclusion should be assumed until you have checked.

You should also compare the quality of communication. A builder who answers questions clearly before the job is more likely to manage cost and expectations during the job. If you are being rushed to accept, or if basic questions are brushed aside, take care.

It can help to read around the subject before you decide. KnowMyQuote has more practical homeowner guidance in its other guides, including how to spot missing detail and compare contractor pricing more confidently.

Red flags in a builders quote

Not every short quote is bad, and not every long quote is good. However, there are warning signs that deserve attention.

A quote that is dramatically lower than the others should be questioned, especially if it has little detail. The builder may have misunderstood the scope, excluded important items, or priced aggressively with the expectation of charging extras later.

Be cautious if the quote avoids VAT clarity. If a builder is VAT registered, the quote should state how VAT is treated. If the builder says VAT can be avoided by paying in cash, that is not a sound basis for a professional arrangement.

Watch out for large upfront payments without a clear reason. A modest deposit may be reasonable, and some materials may require payment before ordering, but you should understand what your money is securing.

Another red flag is the absence of a variation procedure. Variations are normal, but they should be controlled. “We’ll sort it out at the end” is not a reliable process.

Finally, be wary of pressure tactics. A builder may have genuine scheduling constraints, but you should not feel forced to sign a poorly explained quote. If you need time to review it, say so.

Questions to ask the builder before accepting

Before you agree to proceed, ask direct questions and request written answers. You do not need to make the process confrontational. A good builder should welcome clarity because it protects them as well as you.

Useful questions include:

• Is this a fixed quote or an estimate?
• What drawings, specifications and assumptions is the price based on?
• What is excluded from the price?
• Does the total include VAT?
• Which items are provisional sums or allowances?
• What happens if the allowance is exceeded?
• Who is responsible for Building Control fees and inspections?
• Are electrical and gas certificates included where required?
• How will variations be approved and charged?
• What is the proposed payment schedule?
• What insurance do you hold?
• What is the expected start date and duration?
• Who will manage the site day to day?
• What happens if there are delays caused by weather, materials or late decisions?

If you are comparing two or more builders and still cannot tell which quote is stronger, you can compare quotations with KnowMyQuote before making a decision. A second pair of eyes can often spot differences that are easy to miss when you are focused on the headline total.

Frequently asked questions

Before you sign

A builders quote should give you confidence, not just a price. It should explain the scope of work, the assumptions behind the cost, the exclusions, the VAT position, the payment terms and the process for dealing with changes. If those points are missing, ask for clarification before you accept.

You are not being difficult by asking for detail. You are making sure both sides understand the agreement. Most disputes start with different expectations, and a clear quote is one of the best ways to prevent that.

Before you sign, upload your quotation for a free Quote Health Check. KnowMyQuote will review the quote for missing detail, unclear allowances, risky exclusions and comparison issues, so you can go back to the builder with practical questions before committing. If you would like to know more about how we review quotations, you can read about KnowMyQuote or contact us with a specific question.