Most plumbing quotes lose work before the customer has even finished reading them. Not because the price is too high. Not because the work is not up to scratch. Because the quote says "supply and fit new boiler — £2,400" and nothing else.
The customer reading that has no way to evaluate whether £2,400 is reasonable, whether the tradesperson is qualified, what is included in the job, what happens if something goes wrong, or when they will be available to start. So they get another quote. And another. And they pick whichever one looks most professional — which is rarely the one typed on a phone at the end of the day.
This guide covers what a professional plumbing quote needs, what most tradespeople leave out, and how to handle the part that loses the most jobs: the follow-up.
What a professional plumbing quote actually needs
A plumbing proposal is not just a price. It is evidence that you are a safe, competent, professional choice. The customer is inviting someone into their home. The quote is the first signal of how you work.
Here is what it should include:
- Your Gas Safe registration number, displayed prominently. Customers check this before they call. If it is not on the quote, it raises a question.
- A clear scope of works — what is included and what is not. Ambiguity protects no one. A customer who does not know waste pipe is excluded will dispute the invoice.
- Itemised pricing showing labour and materials separately. This is not about transparency for its own sake — it shows you know your costs and have priced the job properly.
- A materials quality statement. If you are fitting a specific brand of part or a mid-range boiler, say so. Customers who have been let down by shoddy materials before will notice this.
- Your 12-month workmanship guarantee, in writing. This reduces the perceived risk of saying yes to someone they have not used before.
- Your public liability insurance cover level. £1m minimum, £2m or £5m for larger jobs.
- Payment terms — deposit, stage payments if applicable, balance on completion.
- An estimated start date and duration. Even a rough window is better than nothing.
The quote should be a PDF or Word document sent by email. Not a text message. Not a WhatsApp voice note with a figure at the end. A document the customer can forward to their partner, read at their own pace, and compare properly against other quotes.
What most plumbers leave out — and why it matters
The three most commonly missing elements are the Gas Safe number, a workmanship guarantee, and a clear exclusions list.
The Gas Safe number is the most important. It is not optional — it is what makes you a legal choice for gas work. Customers who take their home and their family's safety seriously check the register before they hire anyone. If your number is not on the quote, they are doing an extra step to find it, or worse, choosing the quote that makes it easy for them.
The guarantee matters because most domestic customers have had at least one bad experience with a tradesperson. A written workmanship guarantee — even a standard 12-month one — signals that you stand behind your work in a way that a handshake does not. Put it in the proposal. Put it in writing.
The exclusions list matters for a different reason. It protects you. A customer who reads "includes fitting new 24kW combi boiler, new flue, and removal of old unit" and assumes it includes flushing the system, fitting a magnetic filter, and decorating the boiler cupboard is a customer who disputes the invoice. Be specific about what is not included. It does not make you look difficult — it makes you look experienced.
How to price the quote correctly
Pricing is a separate problem from presentation, but the two are connected. A quote that looks professional but is priced on gut feel will either undercharge and eat into your margin, or overcharge inconsistently and lose work you should have won.
The correct approach is to calculate your true day rate first — the rate that accounts for your target income, real working days (not 52 weeks of 5 days), fixed overheads, insurance, vehicle costs, and tools budget — and then price every job from that number. Labour hours times day rate, plus materials at cost with a margin, plus any specialist equipment hire.
What most plumbers find when they calculate their real day rate: their current figure is £50–£80 below the minimum needed to hit their target income after tax and costs. That gap shows up not as a single bad month but as years of working harder than the earnings justify.
Once you have the right day rate, pricing a job takes ten minutes. You know your labour cost. You add materials. You add your margin. You know what the job needs to return.
How to write the follow-up — and why most plumbers do not bother
This is where the most work is lost. You send the quote. You hear nothing. You assume they went elsewhere and move on.
A significant proportion of those quotes were not lost. The customer is busy. They are waiting for their partner to be available. They are comparing three quotes and not sure how to evaluate them. They need a gentle nudge at the right moment with the right information.
A three-part follow-up structured around what the customer is actually thinking — not around what you want to know — is the difference between a 30% conversion rate and a 50% one.
Day 2: confirm and make yourself easy to reach
A short message. Did the quote arrive? Any questions? That is it. You are not chasing — you are making it easy for them to respond. The customer who was meaning to reply but got busy will do so now.
Day 5: address the real concern
By day 5, if you have not heard back, the customer is either comparing quotes or genuinely unsure. The most common concern at this stage — not the stated one, but the real one — is materials quality and lead times. Customers who have had a cheap job done badly before are worried you are going to fit the cheapest parts available and the job will need redoing in two years.
Address it directly in the day 5 message. Not with a price reduction. With information about what you are fitting and why. A brief note on the parts specified in the quote, the manufacturer, and the lead time gives the customer the reassurance they are looking for without you having to guess what the objection is.
Day 10: create a natural urgency
By day 10, the customer has had ten days to decide. If they have not, they need a reason to move now rather than indefinitely. The most effective way to create that urgency is through your availability window — genuine availability, not a fabricated deadline. Something like: "My diary is filling up for [month]. If you want to get [the job] done before then, I would need to confirm by [date]." Real information. No pressure. A natural reason to decide.
The principle behind all three messages: stay present without being intrusive. Answer unspoken concerns proactively. Give the customer a reason to move forward. Leave the relationship intact if they say no.
What a professional proposal actually looks like in practice
To make this concrete: a professional plumbing proposal for a bathroom installation might be three to four pages. Page one: your company details, Gas Safe registration, insurance cover, and a brief introduction to the job. Page two: a detailed scope of works — fixtures specified, connections itemised, what is and is not included. Page three: pricing, payment terms, and guarantee. Page four: your terms and conditions in brief.
That is not an overwhelming document. It is a professional one. It tells the customer that you have managed jobs like this before, that you know what you are doing, and that there will be no surprises. Against a competitor who sent a single figure by text message, it is not a close contest.
The single thing that changes your conversion rate fastest
Of everything covered in this guide, the single change that makes the most immediate difference is adding your Gas Safe registration number and a workmanship guarantee to your current proposal — whatever that currently looks like. Those two elements alone will increase the number of customers who feel confident enough to say yes to you rather than wait for another quote.
Everything else — itemised pricing, exclusions list, materials statement, structured follow-up — compounds on top of that. But start with those two. Do it on your next quote. See what happens.