Boiler Quotes That Convert: The 12-Section Structure

Why most boiler quotes get binned

Turn up, present the quote properly, and the document does half the selling for you.

Let's face it. Most boiler quotes are a text message and a number. "New Worcester combi fitted, £3,200, can start Tuesday." Sound familiar? I see it every week in the accounts of plumbing and heating firms I look after. The good engineers, the ones doing tidy work, losing jobs to someone no better than them.

They are not losing on skill. They are losing on the twenty minutes after they leave the house.

Here's the thing. When your quote lands next to two others, the customer cannot judge your pipework. They cannot see your flue runs or your gas tightness test. They judge the only thing in front of them, which is the quote itself. If yours is a scruffy text and the next one is a clear document with the boiler explained, the warranty spelled out and three options to choose from, you have already lost. Same price, different result.

I wrote The Quote Handbook because I got sick of watching it happen. A quote is not paperwork you rush on a Sunday night. It is the single best salesperson you own, and it works while you are up a ladder on the next job. In my eyes, how you present the quote matters as much as the number on it. This guide gives you the structure. Twelve sections, in order, each doing a job.

The 12-section structure at a glance

Before we go deep, here is the whole thing on one page. Print it, screenshot it, stick it above your desk. This is the running order of a quote that converts, and I will take you through each section with a worked example straight after.

The worked example runs through the lot: a straight combi swap for Mrs Doyle in Rotherham, replacing a tired 24kW system boiler with a 30kW combi. Nothing exotic. The kind of job you quote fifty times a year. Watch how the structure turns a £3,200 number into a document she wants to say yes to.

Section 1: Your header and credentials

The top of the page is not decoration. It is the first thing that tells a nervous homeowner you are the real deal. Your business name, your logo, a phone number that gets answered, and the two things that actually matter for gas work: your Gas Safe registration number and your public liability cover.

A homeowner letting a stranger disconnect their gas supply is taking a leap of faith. Your Gas Safe number on the header, so they can check it on the register in thirty seconds, does more for trust than any amount of glossy design. Put it where they can see it.

Worked example. Mrs Doyle's quote opens with the firm's logo, "Doyle job ref DOY-0417", a mobile and a landline, the Gas Safe number in bold, and one line: "Fully insured, £5m public liability, certificate available on request." Four seconds of reading. She already trusts the document more than the text she got from the bloke down the road.

Section 2: The customer and the job reference

Small section, big signal. The customer's name, the full installation address, the date of the quote and a unique reference number. It takes ten seconds to add and it tells the customer this quote was written for them, not copied off the last one.

The reference number is for you as much as them. When Mrs Doyle rings in three weeks to accept, "it's about DOY-0417" saves you scrolling through forty messages trying to remember which job was hers. It also makes you look organised, which is exactly the impression you want before someone hands over three grand.

Date the quote and give it a shelf life. Materials move. I will come back to that in section twelve, but the date belongs up here.

Section 3: A summary of the site visit

Two or three lines proving you actually looked. Most quotes skip this and it shows.

This is the section almost everyone leaves out, and it is the one that separates a professional from a price-guesser. Two or three sentences summarising what you saw and what the customer told you they wanted.

Why it works: it proves you were there and you were paying attention. It also protects you. When you write down "existing boiler is a 24kW system boiler in the airing cupboard, customer wants to move to a combi in the same location, mains flow tested at 14 litres per minute", you have a record of the conditions you priced against. If the mains turns out to be throttled behind a stopcock nobody could reach, you have a paper trail.

Worked example. Mrs Doyle's summary reads: "During our visit on 3 July we confirmed you want to remove the existing system boiler and hot water cylinder and replace with a wall-mounted combi in the kitchen. Mains cold flow measured at 14 l/min, adequate for a 30kW combi serving one bathroom and an en-suite. Existing gas supply is 15mm and will need upgrading to 22mm to the new location." Three lines. It tells her you know the house.

If writing this up quickly is a chore, it does not have to be. I covered turning rough site notes into clean quote copy in my guide on using ChatGPT to write quotes that win jobs. Dictate the survey in the van, let the tool tidy it, paste it in.

Section 4: The scope of works

Now the meat. Exactly what you are going to do, itemised, in plain English. Not "supply and fit boiler". Every job on the list. This is where a fixed-price quote earns its keep, because the customer can see the work rather than a wall of one number.

Homeowners are told over and over to demand a breakdown, and they are right to. Look at any heating forum and you will see the same complaint: a total price with no detail and no way to know what is actually included. Itemise it and you answer the objection before it forms.

For Mrs Doyle's swap, the scope reads roughly like this:

• Drain down, disconnect and remove existing system boiler, cylinder and feed tanks
• Supply and fit new 30kW combination boiler to kitchen wall
• Upgrade gas supply to 22mm from meter to new boiler location
• New horizontal flue with correct clearances
• Chemical flush of the existing radiator circuit
• Fit magnetic system filter
• Fit new digital programmer and room thermostat
• Fill, pressure test, commission to manufacturer spec and register the warranty
• Full handover and demonstration, plus Benchmark logbook completed

Nine lines. She can see the flush is in. She can see the filter is in. She can see you are registering the warranty. The next quote that just says "£3,000 boiler fitted" now looks like a gamble by comparison.

Section 5: The boiler you are specifying

Tell them what you are fitting and why. Make, model, output in kW, and one honest line on why it suits their house. This is you doing the thinking so they do not have to, and it is where your expertise shows.

Do not bury it. "We recommend a 30kW combi rated for a home with one bathroom and an en-suite, chosen for its modulation range and its parts availability across the north of England" tells the customer you sized it properly and you can get spares fast. That is worth money. It is also why customers on forums keep asking for the make, model and output to be stated in black and white.

Worked example. Mrs Doyle's quote names the boiler, states 30kW, and adds: "Sized on your measured flow rate and hot water demand. Comes with a 12-year manufacturer guarantee when we register it, which is included in every option below." Notice the bridge into the warranty and the pricing. Every section should hand off to the next.

If you are unsure whether to price this as a fixed project or on a day rate, that is a bigger question than one quote. I broke down the trade-offs in project versus day rate versus per square metre pricing. For boiler swaps, fixed project pricing almost always wins the job.

Section 6: System works that make it last

This is the section that protects the customer and protects you. The flush, the magnetic filter, the flue works, the controls, the gas upgrade. The stuff that turns a boiler swap into a reliable heating system rather than a new box bolted to an old problem.

Experienced installers on the trade forums are blunt about it. As one put it on BuildHub, "magnetic filter are a must". Another warns that a power flush is often mis-sold when the real issue is a sticky valve. So be specific about what your clean is and why. Honesty here builds more trust than a scary upsell ever will.

Use this section to gently upsell the things that actually help. New thermostatic radiator valves. A smart control. A filter. Frame them as protecting the investment, because they do. One forum regular summed it up: "take the opportunity to review your controls too, they will more than pay for themselves by energy savings." That is your pitch, straight from a customer's mouth.

Section 7: Exclusions and assumptions

What you are not doing, and what you are assuming. This feels negative. It is the opposite. Clear exclusions stop the argument before it starts and they stop you eating the cost of surprises.

Assumptions are the conditions you priced against. Exclusions are the work outside the scope. Together they draw a clean line around the job.

Worked example. Mrs Doyle's quote states: "This quote assumes the existing radiators and pipework are sound and to be retained. It excludes any making good of plaster or tiling beyond the immediate boiler area, replacement of radiators, and any remedial work to the existing system that becomes apparent once the old boiler is removed. Should hidden issues arise we will stop, explain, and re-quote before proceeding." Now if a radiator is shot behind a unit, you are not funding it out of goodwill.

Section 8: Three-tier pricing

Three real options, priced properly, beat one take-it-or-leave-it number.

Here is the single biggest change you can make to any quote. Stop giving one price. Give three.

When people are handed three options, most reach for the middle. Not the cheapest, because that feels like cutting corners on their own home. Not the dearest, because nobody wants to feel mugged. The middle feels safe and sensible, and that is where you put the option you actually want to sell. Done well, this lifts average job value by 20 to 35 percent, and it changes the conversation from "yes or no" to "which one".

Call them Essential, Recommended and Premium. Anchor the Recommended tier as your suggestion. Here is how it looks for Mrs Doyle.

Those figures are illustrative for this example, not a national price list. The point is the shape. Three clear rungs, the middle one framed as the sensible choice, each one a real package rather than a discount. Mrs Doyle was going to spend £3,200 on a single-option quote. Faced with these three, she takes the Recommended at £3,450 and feels good about it. You just earned more and she got a better job.

Section 9: Warranty and guarantees

Two warranties matter and you should state both. The manufacturer guarantee on the boiler, and your own workmanship guarantee on the installation. Customers conflate the two, so separate them clearly.

Spell out the length of the manufacturer guarantee and, crucially, that it only stands if a registered engineer installs and registers it, which is exactly what you are doing. Then add your own guarantee on the labour. "All our installations carry a two-year workmanship guarantee on top of the manufacturer's cover." That is a differentiator a faceless online fitter cannot match.

Worked example. Mrs Doyle's quote: "12-year manufacturer guarantee, registered by us on the day. Plus our own 2-year workmanship guarantee. If anything we have installed fails in that time, we come back and fix it, no call-out charge." Simple, human, and it kills the fear that you will vanish once the cheque clears.

Section 10: Payment terms

Say how much, and when. Vague payment terms cost you cash flow and they cost you sleep. On a boiler swap that completes in a day, terms are simple. On a bigger install that runs across a week or more, stage payments protect you from funding the customer's boiler out of your own account.

For Mrs Doyle's one-day swap: "A 40 percent deposit secures your installation date and covers the boiler and materials. The 60 percent balance is due on completion, once we have handed over and you are happy." She knows exactly where she stands. You are not out of pocket on the kit.

For anything larger, structure the payments around milestones so you are always paid for work already done. I wrote a full guide on this because it is where so many heating firms bleed cash: how to structure stage payments so you never fund a customer's boiler again. Read it before your next big install.

Section 11: Proof you can be trusted

People buy from people other people trust. This section is your evidence. Two or three short customer testimonials. A before and after photo of a similar install. Your review score. Your registrations and memberships. It costs you nothing and it does a lot of heavy lifting.

Keep it tight. Two genuine quotes from happy customers beat a wall of them. A single clean before-and-after of a similar boiler swap can be more persuasive than a paragraph of your own words. If you have a strong Checkatrade or Google score, put the number on the page.

Here is a real case that makes the point. I know of an engineer who won a £2,400 job over a competitor quoting £2,200. He was dearer, and he still won, purely on how the quote was presented and the proof he stacked up. That is the difference this section makes. The full breakdown of that approach is on my company site, Together We Build: presenting quotes to win more work.

Section 12: The next step

One clear action and a deadline. That is what turns a quote into a booked job.

End with one clear instruction and a deadline. This is where most quotes trail off into "let me know". That is not a close. That is a shrug.

Tell them exactly how to accept, and give the quote a shelf life. "To go ahead, reply to this email or text ACCEPT and your job reference, and we will book your date. This quote holds for 30 days, after which material prices may change." One action. One deadline. No ambiguity.

The deadline is not a gimmick. Material costs really do move, and a soft time limit nudges the fence-sitter without pressure. It also protects you if copper jumps 8 percent next month.

Worked example. Mrs Doyle's quote closes: "Happy with the Recommended option? Text ACCEPT and DOY-0417 to the number at the top and we will confirm your fitting date within the hour. This quote is valid until 2 August." She knows what to do. She does it.

The follow-up that wins the extra work

The quote is sent. Most engineers stop here. That is the mistake. Around 20 to 30 percent of won work comes from a follow-up that most people never send. The quote is the salesperson. The follow-up is the salesperson picking up the phone.

You do not need a fancy system. You need a rhythm. Here is the one I give every firm I work with.

Four touches. None of them desperate. That rhythm alone will lift your conversion more than any price cut, and it keeps the money in your pocket instead of discounting it away. This is what working ON your business looks like, not just IN it.

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