A builder’s quote should do more than state a price. It should identify the work being priced, the information used, the specification assumed, what is excluded, which amounts can change, whether VAT is included and the commercial terms on which the builder is offering to carry out the project.

For a substantial renovation or extension, the quotation should give you enough information to understand what the builder will provide, what remains your responsibility and where additional costs could arise.

The document does not need to price every screw individually. It does need to be clear enough for you to compare builders’ quotes fairly and know what you are accepting.

Builder’s Quote Checklist

Before accepting a quotation, check that it covers the following areas.

Quotation section	What it should establish
Builder details	The legal business or individual offering to undertake the work
Project information	The property, drawings, revisions and specifications used for pricing
Scope of work	The work, products and responsibilities included in the price
Exclusions	Anything necessary that the builder has not included
Allowances	PC sums, provisional sums and other amounts that may change
VAT	Whether VAT is included, excluded or treated differently across the work
Programme	Expected start, duration and any assumptions affecting the timetable
Payments	Deposit, stage payments, due dates and the basis for each payment
Variations	How changes will be described, priced and authorised
Commercial terms	Price validity, insurance, warranties, certification and contract basis

A missing heading is not automatically a problem if the information appears elsewhere. The important point is whether the complete quotation and supporting documents define the proposed agreement with sufficient clarity.

1. The Builder’s Correct Business Details

The quotation should identify who is making the offer and who would become responsible for the work.

Check for:

The builder’s or company’s full legal name
Trading name, if different
Business address
Company number where the contractor is a limited company
VAT registration number where applicable
Telephone number and email address
The name of the person responsible for the quotation
The date and quotation reference

The name should be consistent across the quotation, proposed contract, insurance evidence, invoices and bank account details.

If several different names appear, ask which legal entity would enter into the contract, employ subcontractors, issue invoices and receive payment. This is not an administrative technicality: you need to know who you are appointing.

2. The Property and Project Information Being Priced

The quotation should identify the project address and the information on which the price is based.

For a project supported by professional drawings or specifications, look for references to:

Architectural drawings and revision numbers
Structural engineering drawings and calculations
Schedules of work
Product or finishes specifications
Planning or listed-building information
Party wall information where relevant
Surveys and specialist reports
Tender clarifications and written instructions

The builder does not need to reproduce every document inside the quotation, but it should be possible to establish which versions were priced.

This matters because apparently small drawing revisions can change structural work, drainage, insulation, windows, finishes or quantities. If different builders priced different information, their totals are not directly comparable.

Ask every builder to confirm the full document list in writing before you rely on the price.

3. A Clear Scope of Work

The scope should describe the work included in enough detail for the size and complexity of the project.

For an extension or substantial renovation, this may include:

Site establishment, welfare, protection and temporary access
Strip-out and demolition
Excavation, foundations and groundworks
Drainage and below-ground services
Structural alterations, steelwork and temporary support
External walls, insulation and weatherproofing
Roof structure, coverings, rooflights and rainwater goods
Windows and external doors
Plumbing, heating, ventilation and controls
Electrical work, fittings, testing and certification
Internal walls, plastering and drylining
Joinery, doors, skirtings and ironmongery
Kitchen and bathroom installation
Tiling, flooring and decoration
External work, landscaping and making good
Waste removal, cleaning and handover

General descriptions such as “extension works”, “electrics included” or “complete bathroom” can leave too much room for different interpretations.

The quotation should help you understand the extent of the work. For example, “electrical alterations” does not explain the number of sockets, lighting points, consumer-unit work, testing or certification included.

Where the detailed scope sits in separate drawings or schedules, the quotation should clearly incorporate those documents rather than relying on an assumption that everything shown is automatically included.

4. The Specification Being Allowed For

Two builders can include the same type of work but price very different products, performance standards and finishes.

The quotation should identify important specifications such as:

Window and door materials, glazing and finishes
Insulation products and intended performance
Roof coverings and leadwork
Heating equipment and controls
Electrical accessories and lighting assumptions
Sanitaryware, brassware and bathroom furniture
Kitchen supply or installation responsibilities
Tiling extent and tile allowance
Flooring type and preparation
Joinery materials and finishes
Decoration system and number of coats

The level of detail should reflect the decision being made. A preliminary budget may legitimately use broad assumptions. A final appointment quotation should not leave major quality and cost decisions hidden behind phrases such as “standard specification” or “client choice”.

If the exact product has not been selected, the quotation should state a realistic allowance and explain what that allowance covers.

5. Client-Supplied Items and Work by Others

The quote should state clearly what you are expected to purchase, arrange or provide separately.

Common examples include:

Kitchen units and worktops
Sanitaryware and taps
Tiles and flooring
Decorative light fittings
Appliances
Windows or specialist joinery
Professional fees
Planning, building control and party wall costs
Utility-company charges
Specialist surveys or testing

For every client-supplied item, establish who is responsible for measuring, ordering, delivery, unloading, storage, checking damage, installation materials, fitting and dealing with defects.

“Kitchen supplied by client” does not explain whether the builder has included unloading, assembly, installation, service connections, worktop templating, decoration or waste removal.

Clarifying these interfaces reduces the risk of gaps between the builder’s work and separate suppliers.

6. A Specific List of Exclusions

A useful quotation should say what is excluded, not only what is included.

Potential exclusions include:

VAT
Planning and building control fees
Structural engineer’s design or inspection fees
Party wall surveyor costs
Asbestos surveys and removal
Utility upgrades or new connections
Scaffolding or specialist access
Decoration and floor finishes
Kitchen, bathroom or appliance supply
External work and landscaping
Removal of contaminated material
Repairs arising from concealed defects
Temporary accommodation or storage

An exclusion does not mean the cost disappears. If the excluded work is required to complete the project, add it to your overall budget or obtain a separate price before comparing quotations.

Be cautious where the document says that anything not specifically mentioned is excluded. On a short or poorly detailed quotation, that wording can leave a large part of the project outside the price.

7. Fixed Prices, PC Sums and Provisional Sums

The quotation should distinguish between work that has been firmly priced and amounts that remain adjustable.

A PC sum is generally an allowance for a product that has not yet been selected. The final price may change when the actual product cost becomes known.

A provisional sum is generally an allowance for work that cannot yet be fully defined or priced. The eventual cost may depend on design development, site conditions or the work actually required.

For each allowance, the quotation should explain:

What the amount covers
Whether it covers supply only or supply and installation
Whether delivery and waste are included
Whether VAT is included
Whether overhead and profit will be added
How the allowance will be adjusted
What evidence of the actual cost will be provided

Allowances should be realistic for the intended project and quality level. A low allowance can make the initial quotation appear competitive while transferring part of the likely cost into later adjustments.

The quotation should also identify any daywork rates or schedule rates that might be used when work cannot be priced in advance.

8. A Clear VAT Position

The document should state whether VAT is included or excluded and which rate has been applied.

Most building work on existing houses and flats is charged at the standard VAT rate, although exceptions can apply to certain qualifying work. Do not assume that an unusual VAT treatment is correct simply because it lowers the total.

Where VAT is excluded, calculate the amount you would actually pay before comparing the quotation with a VAT-inclusive price.

For example:

VAT presentation	Amount
Quotation excluding VAT	£85,000
VAT at 20%	£17,000
Total payable	£102,000

Also check whether allowances, optional items and stated rates are shown including or excluding VAT. Mixing the two can distort the comparison and the working budget.

If the VAT position is unclear or appears unusual, ask the builder to confirm it in writing and obtain appropriate tax advice where necessary.

9. Site Costs and Preliminaries

Some costs support the whole project rather than one visible part of the finished building. These are often described as preliminaries.

The quotation should address relevant items such as:

Site supervision and project management
Welfare facilities
Temporary water and electricity
Protection to the existing property
Dust control and temporary partitions
Scaffolding and access equipment
Plant, lifting and temporary works
Skips and waste disposal
Parking permits and delivery restrictions
Security and temporary fencing
Cleaning and final clearance
Insurance and administrative costs

These costs may be distributed through the builder’s rates rather than listed separately. That is acceptable if the builder confirms they are included.

The concern is not whether every overhead has its own line. It is whether necessary project costs have been allowed for somewhere.

10. Start Date, Programme and Price Validity

The quotation should state how long the price remains open for acceptance. Material costs, subcontractor rates and availability can change, so a quotation may not remain valid indefinitely.

It should also record the builder’s current assumptions about:

Expected start date
Estimated project duration
Working hours and access
Lead times for important products
Client decisions required before work begins
Information still required from professionals
Work by separate contractors
Events that may affect the programme

An estimated duration is not necessarily a guaranteed completion date. The eventual written contract should address the agreed start, completion arrangements, extensions of time and delay responsibilities in appropriate detail.

Do not appoint a builder on price alone if the proposed programme does not suit the project or appears unrealistic.

11. Deposit and Payment Schedule

The quote or accompanying terms should explain:

Any deposit required
The amount of each payment
When each payment becomes due
What work or materials each stage represents
Whether payment is based on dates, milestones or valuation of completed work
How invoices will be issued
The final payment and any retention arrangement

Payment stages should be proportionate to the work and avoid leaving the builder substantially overpaid compared with progress on site.

A request for an advance payment may be reasonable where it relates to identified deposits, bespoke products or mobilisation costs. Ask what the money covers and what protection exists if the project does not proceed as planned.

Avoid relying on a payment schedule that consists only of percentages without explaining the corresponding work stages.

12. How Variations Will Be Managed

Even a detailed quotation cannot prevent every change. Renovations can reveal concealed conditions, and homeowners may alter the design or specification.

The quotation or proposed contract should explain how variations will be:

Described
Priced
Approved
Added to or deducted from the contract price
Reflected in the programme
Invoiced

Whenever practicable, agree the cost and time effect in writing before varied work proceeds.

Ask whether overhead and profit, administration charges or other mark-ups will be applied to changes, PC sum adjustments or work carried out by subcontractors.

Verbal conversations on site are easily remembered differently. A clear written variation process protects both homeowner and builder.

13. Insurance, Certification and Handover

The quotation should not be treated as proof that all business and project checks have been completed.

Before appointment, establish which insurance the builder holds and whether it is suitable for the proposed work. Depending on the project, this may include public liability, employers’ liability and cover relating to the contractor’s work or design responsibilities.

Also clarify who will provide relevant completion information, such as:

Electrical and gas certification
Building control completion documents
Product guarantees
Roofing or waterproofing warranties
Commissioning information
Operating instructions
As-built information where required
Keys and access information

Check whether fees for tests, certification and specialist commissioning are included in the price.

14. The Contract and Supporting Documents

A detailed quotation is important, but it is not a complete substitute for a suitable written building contract.

The contract should bring together the agreed:

Parties
Scope and specification
Price and allowances
Start and completion arrangements
Payment terms
Variation procedure
Insurance responsibilities
Delay provisions
Defects obligations
Suspension and termination rights
Dispute-resolution process

It should also establish which document takes priority if the quotation, drawings, specification and later clarifications conflict.

For substantial work, avoid accepting a quote and paying a deposit while important terms remain scattered across messages, drawings and verbal discussions. Ask for the final agreed position to be recorded coherently before work begins.

Worked Example: Vague Wording Versus Clear Scope

Consider two descriptions of bathroom work.

Vague wording	Clearer quotation wording
“Complete bathroom included — £8,000”	“Remove existing fittings and wall finishes; alter hot, cold and waste pipework within the room; install client-supplied bath, WC, basin and taps; allow £30/m² supply for 22m² of tiles; tile walls around bath and full floor; include standard adhesive, grout, waterproofing to bath area, electrical certification, waste removal and making good. Decoration and specialist lighting excluded.”

The clearer description does not eliminate every question. It does reveal what the builder has priced, what the homeowner must supply and which items remain excluded or subject to an allowance.

That information makes the price more useful and easier to compare.

How Detailed Should a Builder’s Quote Be?

The appropriate level of detail depends on the project.

A small repair may be adequately described in a short quotation. A six-figure extension or whole-house renovation requires substantially more information because it contains more trades, interfaces, assumptions and opportunities for cost movement.

The quotation does not need to reveal the builder’s confidential internal calculations or profit on every line. It should provide enough breakdown to:

Understand the scope
Identify important specifications
Find exclusions and allowances
Compare alternatives fairly
Relate payments to progress
Manage changes
Form a reliable basis for the contract

Detail should be proportionate, but clarity should never depend on guesswork.

Warning Signs in a Builder’s Quote

Clarify the position before appointment if you see:

A major project priced in only a few lines
No reference to drawings or specifications
No clear total
VAT not mentioned
Many items marked “to be confirmed”
Large or unexplained allowances
Important work described only as “as required”
No exclusions
A requirement for a large upfront payment without explanation
Payment stages running ahead of the work
No process for approving variations
Different business names across key documents
A price that is much lower than comparable quotations without a clear reason
Pressure to accept immediately
Verbal assurances that the builder will not add to the written document

No single point proves that the builder is unsuitable. The risk increases when several unresolved issues appear together.

Questions to Ask Before Accepting the Quote

Send material questions in writing and request a revised quotation where the answers alter the price or scope.

Is this a quotation or an estimate?
Which drawings, revisions and specifications have been priced?
Please confirm the complete scope included in the total.
What work, products and fees are excluded?
Which items must I supply or arrange?
Does the total include VAT?
Which prices are fixed and which remain adjustable?
What does each PC sum or provisional sum cover?
Do allowances include delivery, installation, waste, overhead, profit and VAT?
Are scaffolding, welfare, protection, supervision and waste removal included?
What assumptions have been made about the existing building and hidden conditions?
What could cause the price to change?
How will variations be priced and approved?
How long is the quotation valid?
What start date and duration are assumed?
What deposit and payment schedule are proposed?
Which insurance, certification and warranties will apply?
Which written contract is proposed?

If the response is simply “everything is included”, ask for the important work and responsibilities to be identified in the quotation or supporting schedule.

Frequently Asked Questions

Does a builder’s quote have to include a full cost breakdown?

The appropriate breakdown depends on the project. You may not need every internal labour and material rate, but the quotation should contain enough detail to understand the work, specifications, allowances, exclusions and payment basis. A single total is rarely sufficient for a substantial renovation.

Should a builder’s quote include materials?

It should state which materials and products are included, which are allowances and which must be supplied by the homeowner. Important specifications should be identified where they affect price, quality or performance.

Should a builder’s quote include VAT?

The quotation should state clearly whether VAT is included or excluded and which rate applies. Most building work on existing houses and flats is standard-rated, although exceptions exist. Compare the total amount payable rather than mixing VAT-inclusive and VAT-exclusive figures.

Should a builder’s quote include a start and completion date?

It should record the current start and programme assumptions. The final contract should set out the agreed arrangements and explain how delays or extensions of time will be handled. An estimated programme should not automatically be treated as a guaranteed completion date.

Is a builder’s quote legally binding?

Accepting a quotation can create a contract, including through words or conduct. The precise legal position depends on what was offered, accepted and subsequently agreed. For substantial work, use a suitable written building contract and obtain legal or consumer advice where needed.

Can a builder charge more than the quotation?

The price may change where you request additional work, an agreed allowance is adjusted, a valid variation arises or the contract otherwise permits an adjustment. The quotation and contract should explain these circumstances. Do not assume every later cost is automatically justified simply because it was not expected.

What is the difference between a quote and an estimate?

A quotation normally offers to carry out defined work for an agreed price, subject to its terms and permitted adjustments. An estimate is an informed indication of likely cost and may change as information develops. Check the wording and price basis rather than relying only on the document’s heading.

What if the builder refuses to provide more detail?

Ask for information proportionate to the project and explain the material points that need clarification. If the builder will not define important scope, allowances, exclusions or payment terms, decide whether you are prepared to accept that uncertainty before appointing them.

Before You Accept the Quotation

Confirm that you can answer each of these questions:

Who exactly am I appointing?
Which project information has been priced?
What work and specification are included?
What must I supply or arrange?
What is excluded?
Which costs can still change?
Is VAT treated correctly and consistently?
What is the likely total payable?
Are the programme and payments acceptable?
How will changes be agreed?
Is the builder suitable and properly insured?
Does the proposed contract record the agreement clearly?

A good builder’s quote does not remove every construction risk. It gives you a sufficiently clear starting point for asking questions, comparing alternatives and forming the contract.

Need Help Reviewing a Builder’s Quote?

Before You Build provides independent builder quotation reviews for homeowners before a contractor is appointed.

We assess quotations for missing scope, vague specifications, exclusions, allowances, inconsistencies and potential cost exposure. The purpose is to help you understand what has been included, what remains uncertain and which questions should be resolved before you commit.

First Check — £59: an initial review of one builder’s quotation
Full Check — £119: a more detailed assessment of one quotation
Full Comparison — £349: a structured comparison of up to three builders’ quotations

Before You Build complements the work of architects, quantity surveyors, project managers, engineers, surveyors and other professionals. It does not select or recommend a contractor, verify workmanship, provide legal or tax advice or replace a project-specific cost plan or suitable written building contract.

This guide provides general information for UK homeowners. It is not legal or tax advice, a contractor recommendation or a guarantee of final cost. The suitability of a quotation and contract depends on the project information, agreed terms and checks completed. Obtain appropriate professional, consumer, tax or legal advice before making significant financial or contractual decisions.

What Should A Builder’s Quote Include?