How to Write a Professional Quote: Structure, Exclusions & Validity

Summary

A professional written quote is the foundation of every successful customer relationship. It sets expectations clearly before work begins, protects you if a dispute arises, helps customers compare tradespeople on a like-for-like basis, and demonstrates that you run a serious business. Customers who receive a clear, detailed quote are more likely to trust you, more likely to accept your price, and less likely to raise post-completion disputes about what was included.

Many UK tradespeople quote verbally or send a brief email with a single total number. This approach leads to disputes about scope ("I thought that included the painting"), disputes about price ("you said it would be around £X, not £X plus extra"), and no contractual basis for chasing unpaid invoices. A detailed written quote eliminates most of these problems before they start.

This article covers the structure of a professional quote, what to include in the scope of work, how to write effective exclusions, how to price labour and materials, and the legal status of the quote once accepted by the customer. It applies to all trades — electrical, plumbing, carpentry, roofing, tiling — with trade-specific examples throughout.

Key Facts

• Quote vs estimate: A quote is a fixed price (unless varied); an estimate is approximate and can be revised. Use "quote" if you intend to hold the price; "estimate" if you are uncertain
• Quote validity: Typically 30–60 days; longer validity increases your materials price risk; state clearly
• VAT: If registered, state whether the price is inclusive or exclusive of VAT, and the applicable rate
• Payment terms: Always state payment terms — net 7 days, net 14 days, or staged payments at defined milestones
• Deposit: State any required deposit, typically 10–33% for materials
• Quote reference: Unique reference number for internal tracking and for reference in correspondence
• Exclusions: Explicitly list what is NOT included — these protect you as much as the inclusions
• Provisional sums: Include as a separate line item for items that cannot be precisely quantified at time of quoting (e.g. "provisional sum for unknown pipe routing £200")
• Daywork rates: Include your day rate and overtime rates for any work instructed outside the quoted scope
• Acceptance mechanism: Specify how the customer should accept the quote (email reply, signed and returned, online acceptance)
• Legal status: An accepted quote is a legally binding contract — ensure you are happy with every term before sending
• Consumer Contracts Regulations 2013: Customer has 14-day cooling-off right for contracts concluded off-premises — your quote acceptance process must accommodate this

Quick Reference Table

Detailed Guidance

Header and Business Information

Your quote header should include:

• Business trading name and legal name (if different)
• Registered business address
• Company registration number (if limited company)
• VAT registration number (if VAT-registered)
• Your trade certification number (Gas Safe registration, NICEIC/NAPIT number, etc.)
• Phone number and email address
• Website (if applicable)
• Date of the quote
• Quote reference number

The certification numbers are particularly important — many domestic customers now check them. Gas Safe engineers must display their registration number on all documents and ID card. NICEIC/NAPIT numbers confirm Part P competency. For roofing, NFRC membership or other accreditation should be stated.

Scope of Work — Writing Effective Descriptions

The scope of work is the heart of the quote. It should describe exactly what you will do, in enough detail that a third party (such as a judge in small claims court) could determine whether you have fulfilled your obligation.

Avoid vague language: "carry out plumbing works" or "fit kitchen" gives the customer far too much room to interpret. Instead:

Bad: "Install new bathroom suite"

Better: "Supply and install: close-coupled WC suite (Villeroy & Boch Subway 2.0 or equivalent), 700×490mm single-ended steel bath with chrome bath filler, 600mm vanity unit with integrated basin and mixer tap, chrome towel rail (600×800mm), and extractor fan (to comply with Part F Building Regulations). Includes connection to existing waste and supply pipework. Does not include tiling, plaster making good, or electrical other than extractor connection to fused spur."

Trade-specific scope elements to include:

Electrical: circuit reference numbers, consumer unit details, testing, certification (Electrical Installation Certificate or Minor Works Certificate), notification to Building Control or under a competent person scheme

Plumbing: whether work includes pressure testing, Building Regs notification where required (unvented cylinders = G3), inhibitor dosing on heating systems

Roofing: scaffold costs (included or excluded), felt/underlay specification, tile/slate type, ridge/hip treatment, any flashings included

Carpentry: material specification (MDF, plywood, species), finish (painted/stained/oiled), fixtures included (handles, runners, hinges)

Tiling: tile specification or whether customer-supplied, adhesive and grout specification, silicone finishing, sealing of natural stone

Inclusions vs Exclusions — Getting It Right

Inclusions define what you will do. Exclusions define what you will not do. Both are essential.

Common exclusions by trade:

All trades: disposal of waste (if not included — state tip run costs separately), making good after trades work (e.g. replastering after first fix), decorating, Building Regulations fees, planning fees, party wall surveys, any work not specified above.

Electrical: plastering/making good chases, decorating, testing of existing installation outside scope of works.

Plumbing/heating: draining down and refilling heating system if existing system requires flushing separately (quote separately if likely), pipe boxing, making good floor surfaces after underfloor works.

Roofing: scaffold (unless included), chimney repairs (unless specified), structural repairs to rafters (include a provisional sum if uncertain), any existing valley or parapet works not listed.

Carpentry/joinery: painting/decorating, electrics inside fitted furniture, plumbing for fitted units.

Tiling: supply of tiles (if customer-supplied), tile removal (quote separately if existing tiles need removing), waterproofing system (if not included).

State exclusions positively: "The following items are excluded from this quotation and will require separate instruction if required:" followed by a clear list.

Provisional Sums

A provisional sum is an allowance in the quote for work whose cost cannot be determined precisely at quoting stage. It is not a guarantee that the work will cost that amount — it is an acknowledged uncertainty.

Examples:

• "Provisional sum for clearance of unknown pipework routing: £150"
• "Provisional sum for additional batten to rectify existing roof structure defects: £250"
• "Provisional sum for disposal of existing materials: £100"

Provisional sums should be flagged clearly in your quote and in your T&Cs. The actual cost replaces the provisional sum once known, and the customer should be informed before you exceed the allowance. If provisional sums could be significant, discuss them with the customer at survey stage to set expectations.

Price Structure

Domestic customers generally prefer a single total price rather than a detailed breakdown. However, providing at least a high-level split between labour and materials helps in two ways: it demonstrates transparency, and it supports VAT recovery for any VAT-registered customers (who need to know the materials content).

If you include a materials allowance within a fixed price, state: "The above price includes materials specified. Any substitutions or upgrades to specified materials will be charged at cost difference."

Day rate for variations: include your standard day rate (£XXX per day + VAT if applicable) and call-out rate for additional instructed work. This avoids renegotiating rates mid-project.

For large projects, stage payments reduce your cash flow risk and the customer's exposure to paying in advance. Define milestones clearly — not just percentages:

• 20% on acceptance (mobilisation and materials deposit)
• 30% on completion of first fix / structural phase
• 30% on completion of second fix
• 15% on practical completion
• 5% on expiry of defects liability period (if a retention is agreed)

Quote Validity and Price Escalation

Materials prices in the UK construction industry have been volatile. Include a quote validity period (typically 30–60 days) after which you reserve the right to revise the price. If the customer does not accept within the validity period, requote.

For long-lead projects (extensions, renovations), consider a clause stating that materials prices are confirmed at time of order and any significant supplier price increases (e.g. over 5%) will be passed to the customer with evidence.

Do not accept open-ended "pending" acceptances — a customer who says "yes, we'll go ahead, but not for 6 months" is essentially asking you to hold a price indefinitely. Requote when the job becomes active.

Presentation and Delivery

Send your quote as a PDF — not a Word document or plain-text email. A PDF is tamper-proof, looks professional, and ensures your formatting renders correctly on all devices. Use your business letterhead (or a well-formatted template) with consistent fonts and spacing.

Send by email with the PDF attached. Ask for written acceptance by email reply or signed return. Email acceptance is legally valid in UK contract law.

Using squote: squote generates a professional PDF quote from a voice recording — describe the job out loud, and squote builds the structured quote, sends it by email, and keeps a full history of every quote you've sent. It covers all the elements in this article automatically.

Follow up within 3–5 business days if you have not received a response. A brief, professional follow-up ("I wanted to check you received my quote dated [X] and whether you have any questions") shows initiative and helps you win more work.

Frequently Asked Questions

Is a verbal quote legally binding?

A verbal agreement can form a contract in UK law, but it is almost impossible to enforce because there is no agreed record of the terms. If a customer verbally accepts a verbal quote and later disputes the price, you have no written evidence. Always follow up a verbal discussion with a written quote.

Should I separate labour and materials?

For domestic customers, a combined total is simpler and most customers prefer it. However, for VAT-registered clients who can recover VAT on materials, separating the two is helpful. If you are not VAT-registered, there is no tax reason to separate them, but transparency is good practice.

How detailed does the scope of work need to be?

Detailed enough that there is no ambiguity about what is included. The test is: if you and the customer disagreed about whether a specific item was included, would the written scope of work resolve the dispute? If yes, it is sufficiently detailed. If it could be read either way, add more detail.

Can I use a quote from a supplier as part of my customer quote?

Yes — many tradespeople pass through supplier quotes (e.g. for specialist materials, kitchen units) as part of their overall quote. Mark these clearly as "supplier quote, subject to availability" and ensure your markup is appropriate. If the supplier quote changes, your right to pass the increase to the customer should be covered in your T&Cs.

What if the customer asks me to start before they've formally accepted the quote?

This is common on domestic jobs. If the customer says "just get started, I'll sort the paperwork later," you are proceeding on the basis of verbal acceptance. Protect yourself by sending an email stating: "As discussed, I will start work on [date] on the basis of my quote reference [X] dated [Y] at a total of £[Z] plus VAT. Please confirm by reply." This creates a written record of acceptance.

Regulations & Standards

• Consumer Rights Act 2015 — services must be carried out with reasonable care and skill; price implied to be reasonable if not stated

• Consumer Contracts Regulations 2013 — off-premises contracts require cooling-off period information; applies to how quotes are accepted

• Late Payment of Commercial Debts Act 1998 — automatic interest for overdue B2B invoices

• Electronic Communications Act 2000 — electronic acceptance (email) is legally valid

• FMB (Federation of Master Builders) Quote Guidance — practical guidance on professional quoting for builders

• Which? Trusted Traders Quote Template — example structure for domestic trade quotes

• Gov.uk — Business Contracts Guide — UK contract law basics

• HMRC VAT Guidance for Tradespeople — VAT on construction services

• terms conditions — full T&Cs to accompany your quote

• cdm regulations — pre-construction information requirements for larger projects