Why your quotes matter more than you think

A sloppy quote on the back of a receipt doesn't just look unprofessional - it costs you work. Homeowners compare quotes side by side, and the plumber who sends a clear, itemised breakdown almost always gets the job over the one who texts "about 800 quid".

A proper quote also protects you legally. In the UK, a quote is a fixed price. Once the customer accepts it, you can't charge more unless the job scope changes. Get it wrong and you're either out of pocket or in a dispute.

Here's how to write quotes that win work and keep you covered. And if you're looking for a faster way to do this, check out our quoting software for tradesmen.

Quote vs estimate - know the difference

This trips up a lot of plumbers, and it matters legally in the UK.

A quote is a fixed price. You're committing to do the work for that amount. If the job takes longer than expected or materials cost more, that's on you. The customer only pays what was quoted.

An estimate is your best guess. The final bill can differ, but it should be reasonable - you can't estimate £500 and then invoice £2,000 without good reason.

Under the Consumer Rights Act 2015, if no price is agreed at all, you must charge a "reasonable price". But that's vague and leads to arguments. Always put a number in writing.

Rule of thumb: Use a quote for straightforward jobs where you can assess the full scope (tap replacement, radiator install, boiler service). Use an estimate for jobs where hidden problems are likely (drainage issues, old pipework in a Victorian terrace).

What to include in every plumbing quote

Your business details

Full name or trading name
Business address
Phone number and email
Gas Safe registration number (if applicable)
VAT number (if registered)

Customer details

Customer name
Property address where work will be carried out

Job description

Break down exactly what you're going to do. Don't write "fit new bathroom" - that means different things to different people. Be specific:

Remove existing bath, basin, and toilet
Supply and fit new P-shaped shower bath with glass screen
Supply and fit new basin with vanity unit
Supply and fit new close-coupled toilet
Connect all waste pipes to existing soil stack
Test all connections and check for leaks

Itemised costs

Split labour and materials. Customers like seeing where their money goes, and it builds trust.

Item	Cost
Labour (2 days at £250/day)	£500
Shower bath with screen	£320
Basin with vanity unit	£180
Close-coupled toilet	£150
Waste pipes, fittings, silicone	£45
Total (ex. VAT)	£1,195

If you're VAT registered, show the VAT separately. If you're not, state "not VAT registered" so there's no confusion. Our invoicing software handles VAT calculations automatically for both registered and non-registered tradesmen.

Payment terms

When payment is due (on completion, within 7 days, 50% deposit up front)
Accepted payment methods (bank transfer, card, cash)
What happens with late payments

Validity period

State how long the quote is good for. 30 days is standard in the trade. Material prices change - especially copper pipe and boiler parts - so don't leave quotes open-ended.

Exclusions

This is where most plumbers get caught out. Be clear about what's NOT included:

Making good (plastering, tiling, decorating after pipework)
Electrical work (if a separate electrician is needed)
Building control fees
Skip hire or waste removal
Asbestos testing or removal in older properties
Fixing problems hidden behind walls or under floors

A simple line like "This quote covers plumbing work only. Any plastering, tiling, or electrical work is not included" saves arguments later.

Real-world quote examples

Example 1: Combi boiler swap

Job: Remove existing combi boiler and install new Vaillant ecoTEC Plus 832 in same location.

Item Cost

Labour (1 day) £350

Vaillant ecoTEC Plus 832 (supply) £1,050

Magnetic filter, fittings, flue £120

System flush £150

Gas Safe notification £40

Total £1,710

Includes: removal of old boiler, new boiler installation in same position, system flush, Gas Safe certificate. Excludes: any additional pipework modifications, radiator upgrades, electrical work. Quote valid for 30 days.

Example 2: Leaking tap repair

Job: Replace ceramic disc cartridges in kitchen mixer tap.

Item Cost

Labour (1 hour) £60

Cartridges and washers £15

Total £75

If the tap body is damaged and a full replacement is needed, I'll contact you with a revised quote before proceeding. Quote valid for 14 days.

Example 3: Full bathroom refit

Job: Strip out and refit family bathroom (approx 2.4m x 1.8m).

Item Cost

Strip out and disposal £300

Labour (5 days at £250/day) £1,250

Bath, basin, toilet (customer to supply) £0

Waste pipes, traps, valves, fittings £85

Shower mixer and riser kit £180

Total £1,815

Customer supplying all sanitaryware. Quote covers plumbing only. Tiling, plastering, flooring, and electrical work (extractor fan, lighting) not included. 50% deposit required before start. Quote valid for 30 days.

Common quoting mistakes that cost you money

1. Quoting without visiting the site Photos don't show everything. You can't see the state of the pipework behind the bath panel, and you can't feel how solid the floor joists are from a photo. Site visits take 20 minutes and save hours of problems later.

2. Forgetting to account for access issues A boiler swap in a ground floor utility room is a different job to the same boiler in a loft conversion with narrow stairs. Factor in the time and hassle.

3. Not including a "hidden works" clause Older properties always have surprises. Include a line like: "If unforeseen issues are discovered (e.g., corroded pipework, damaged joists), I will notify you and provide a separate quote for additional work before proceeding."

4. Undercutting yourself to win the job Winning a job at a loss isn't winning. Know your day rate, know your material costs, add your margin, and stick to it. Customers who only want the cheapest quote are usually the hardest to deal with anyway.

5. Sending quotes late If you visited on Monday, send the quote by Tuesday. The first plumber to send a professional quote usually gets the job. Wait a week and the customer's already booked someone else.

VAT - when does it apply?

The current VAT registration threshold in the UK is £90,000 in taxable turnover over any 12-month rolling period. Once you cross that line, you must register with HMRC and charge 20% VAT on your invoices.

If you're below the threshold, you don't need to charge VAT - but make this clear on your quotes so customers aren't confused.

Many plumbers near the threshold use the Flat Rate Scheme. You charge customers the full 20% VAT but pay HMRC a lower percentage (typically around 9.5% for plumbing), keeping the difference. It simplifies your bookkeeping and can save you money. Worth discussing with your accountant once your turnover gets close to the threshold.

How to send quotes faster

Writing quotes on paper or in Word means sitting down after a long day and typing everything out. Most plumbers we speak to say quoting takes 30-45 minutes per job, and some admit they put it off for days.

VioTrade lets you create itemised plumbing quotes on your phone in minutes. Add your line items, set your labour rate, and send a professional PDF to the customer on the spot - while you're still standing in their kitchen. If they accept, convert it to an invoice with one tap. See how other plumbers use VioTrade to run their business on our plumbing software page.

Quick checklist before you send

You'll also want to make sure you're properly covered before starting any job - read our guide on what insurance tradesmen need in the UK.

A professional quote doesn't just win you the job. It sets clear expectations, protects your cash flow, and means fewer awkward conversations about money down the line.

Try VioTrade free for 7 days - create and send plumbing quotes from your phone in minutes.

How to Write a Plumbing Quote - Template, Tips & Examples (2026)