A full boiler swap on a tired open-vented system. A run of CP12 renewals across a landlord's portfolio. A first air source heat pump install funded through a government grant. None of these jobs are won at the kitchen table while you drain the system. They are won days earlier, in the document you send before anyone lifts a flue terminal.
When that document is a single figure typed into the body of an email, you have handed the work to whichever engineer sent something clearer. The boiler might be identical. The commissioning might be identical. What the customer actually compares is the proposal.
Download: Heating Proposal Template (PDF)
Download: Heating Proposal Template (Word)
Download: Heating Proposal Template (Excel)
This guide covers when a heating job has outgrown a quick quote, what every section of the document should carry, and how to write something a homeowner or a managing agent will sign. The point is plain. Protect your margin, look like the registered, organised business you are, and win more of the work you want without shaving your price to get it.
Heating Proposal Template vs Quick Quote: When Each One Wins
A quote hands the customer a number. A proposal wins the job and sets the terms you will be measured against. Deciding which one a job needs is the first call you make.
For a straightforward domestic callout, a quick quote is usually all anyone wants. A failed diverter valve, a noisy pump, a thermostat that has given up. The customer wants a price and a date, not a ten-page document.
A proper proposal earns its keep the moment the work grows in any of these directions:
- Multiple systems or appliances are in play, such as a full heating upgrade, a cylinder conversion, or a plant room refit.
- The client is commercial or a managing agent weighing your bid against two others across a portfolio.
- The work runs in stages, with strip-out, first fix, second fix, and commissioning spread over several days.
- Funding or compliance sits inside the job, such as a Boiler Upgrade Scheme heat pump install, a landlord CP12 programme, or Building Control notification.
Here is the rough test most heating firms settle on.
| Job characteristic | Quick quote | Full proposal |
|---|---|---|
| Single fault or part swap | Yes | No |
| Full boiler or system replacement | No | Yes |
| Managing agent comparing bids | No | Yes |
| Phased works with commissioning milestones | No | Yes |
| Grant-funded or notifiable work | Sometimes | Yes |
Commercial clients and letting agents are not only reading your figure. They are working out whether you are the contractor who turns up, commissions to the manufacturer's instructions, leaves the right certificate, and does not invent costs halfway through. A clear proposal answers that before they have to ask.
Operational fix: Set a threshold and make it a rule, not a mood. Above a defined job value, or any time a job touches more than one appliance or a commercial site, it gets a proposal. Take the judgement call out of it.
What to Put in a Heating Proposal
A domestic service proposal should sit at four to six pages. A larger commercial tender can run longer, but once you push past a dozen pages you start burying the detail that wins the job. Below is the structure that consistently lands the work.
Your registration and the client's details
Open with a clean header. Company name, logo, Gas Safe Register number, and public liability insurance details belong at the top. On the client side, add their name, the property address, and their contact details.
Then add a proposal reference number, the issue date, and an expiry date.
The expiry date does two jobs at once. It nudges the client to decide, and it shields you from honouring a price after your merchant's costs have shifted. Thirty days is a sensible default for domestic work. For commercial jobs, set it against your supplier quotation windows, because boiler, cylinder, and copper pricing rarely holds still for long.
What you found on the survey
Two to four sentences describing the situation. What you saw on the survey, what is actually wrong, and what you are proposing to do about it.
Even a short, specific opening tells the client this was written for their boiler, not pulled from a folder and renamed. It is the line between an engineer who understands the system and one who owns a template.
Scope of works, system by system
This is the section that wins or loses the job. Describe exactly what will be carried out, area by area, across the whole installation.
For a domestic combi swap, set out:
- The make, model, and output of the new appliance and why it suits the property's demand.
- Whether you are power flushing or chemically cleansing the system, and the magnetic filter being fitted.
- New controls being installed, such as a programmable room thermostat or load compensation.
- How long the heating and hot water will be off, and what that means for the household.
- What happens if you find a buried leak or a failed component on an existing circuit once the system is opened up.
For a commercial plant room or a heat pump install, set out:
- Appliance counts, outputs, and how they are sequenced or cascaded.
- Pipework routes, insulation specification, and any flue or condensate runs.
- Isolation, draining, and any out-of-hours working to keep the client's building running.
- Coordination with other trades, such as the electrician for the supply, or the builder for the base.
State which notifications you are making and which certificates you will issue on completion, referencing Gas Safe notification, Benchmark commissioning, and Part L of the Building Regulations where the job calls for it.
Exclusions matter as much as inclusions. Spell out what is not in the proposal. Builder's work, making good and decorating, asbestos surveys, an upgraded gas supply or meter, or any electrical works left to another trade. On commercial bids, add a clause covering concealed or undocumented existing pipework. Anything found buried in a wall, a floor void, or a riser that was not visible at survey should trigger a variation, not quietly eat your margin.
Operational fix: Write the scope for someone who was not on the survey. If a second engineer could price the job accurately from your description alone, it carries enough detail.
Appliances, parts, and materials, named in full
Detail what you are installing. Not "a new boiler" but the manufacturer, model, output, efficiency rating, and warranty length. Not "controls" but the specific thermostat, valves, and filter.
When your proposal lists a named A-rated boiler with a long manufacturer warranty, a system filter, and weather compensation against a rival's "supply and fit new boiler," the client comparing the two finally understands why the prices differ. Specificity is how you defend the higher number.
Labour by stage
Separate labour from materials, then break the labour down by stage where it helps the reader. Strip-out and drain-down, first fix, second fix, then commissioning and handover each deserve their own line on a larger job.
State crew size, any subcontracted elements such as the electrical connection, and how many engineers will be on site across a multi-day install. That level of detail heads off the disputes that surface when everything is bundled under a single "labour" figure.
A pricing breakdown the client can actually read
An itemised price builds trust. A lump sum invites suspicion.
Picture a client weighing a flat £4,200 against a proposal showing £1,950 for the boiler and controls, £1,300 in labour across three stages, £180 for a power flush, a £120 Building Control notification, and £450 for overhead and margin. Only one of those clients knows what they are paying for.
Structure the pricing table with clear categories:
- Appliances and materials, itemised by component with quantities and unit costs.
- Labour, broken down by stage or phase.
- System treatment and specialist work, such as power flushing, magnetic filter, or chemical cleanse.
- Subcontractor costs, clearly labelled.
- Notification, commissioning, and Building Control fees.
- Overhead and margin, named rather than hidden.
- Subtotal, VAT, and total.
This is the part of the job where confidence pays. Underpricing to win work is one of the most common mistakes growing heating firms make, and a margin is far harder to claw back than to justify. A proposal that shows the client exactly where the money goes is what lets you hold a healthy figure without flinching.
Operational fix: Name your overhead and margin line out loud. Clients rarely object to a contractor running a proper business. They object to numbers they cannot account for.
Good, better, best on the boiler
Offering three tiers lifts the average value of the job by handing the client a decision rather than a flat yes or no.
A good option fixes the core need with a solid, well-priced appliance. A better option steps up to a higher-spec boiler, smart controls, or a longer warranty. A best option folds in an annual service plan, premium controls, or a system upgrade that future-proofs the property. Many households take the middle option precisely because you gave them one.
Programme, lead times, and access
State your proposed start date and an estimated completion. For phased works, break the programme into milestones. Strip-out complete, first fix done, system commissioned and tested, final handover with certification.
Build in merchant lead times on long-lead items such as a heat pump or a bespoke cylinder, plus the access and isolation windows you need from the customer or the building manager.
Warranties, commissioning, and certification
A twelve-month workmanship guarantee is standard, and many heating firms offer longer on larger installs. Draw a clear line between your labour guarantee and the manufacturer's warranty on the appliance, and explain that the manufacturer warranty usually depends on registration and an annual service.
Confirm exactly what the client receives on completion. The Gas Safe notification and Building Control certificate, the Benchmark commissioning record, and a CP12 gas safety certificate where the property is let. Tying the paperwork to the job in writing is part of looking like the registered outfit you are.
Terms, conditions, and the get-outs
A complete terms section covers payment terms, variations, concealed conditions, dispute resolution, and confirmation of insurance. For commercial work, address retention handling, payment schedules, and any bonding or insurance the client has specified. Read every commercial contract for these terms before you put your name to it.
Acceptance and e-signature
Close with a clean acceptance block. Signature lines for both parties, printed name fields, and a date. Enable electronic signatures wherever you can. According to Proposify's State of Proposals 2025 report, documents that include e-signatures close 40% faster than those waiting on a printed signature.
How to Write a Heating Proposal Gas Customers Sign Off
A solid template gets you most of the way. How you write inside it decides whether the proposal is seriously considered or quietly set aside. These habits tilt the odds your way.
Lead with what you found, not what you do
Open by describing the survey, not your service list.
Compare these two openings. "This proposal covers heating works." Against: "On the survey on 14 May 2025, we found a 15-year-old open-vented boiler short-cycling, heavy magnetite in the system water, and a hot water cylinder past its useful life. The system needs replacing rather than patching, and a power flush is essential before any new appliance goes on."
The first tells the client you own a template. The second tells them you understand their home. Only one earns the job.
Be specific about what is in, and what is out
Disputes grow out of vague language in the scope, the labour breakdown, and the materials list. Write for the person who was not standing in the airing cupboard with you on survey day. Granular detail signals transparency, shows your expertise, and surfaces the awkward questions before work starts rather than halfway through a strip-out.
On commercial and managing-agent work, this level of detail is simply what serious heating contractors are expected to provide.
Make the price easy to read
The same openness you bring to the scope belongs in the pricing. Break the cost down rather than leaving one figure to be argued over. If overhead sits in the total, say so. When your numbers are clear and easy to follow, clients push back far less often, and tools that let you build professional quotes fast make that breakdown quick to produce on every bid.
Translate the technical into plain English
This matters most on domestic work. A homeowner does not need to know the system volume or the design flow temperature. They need to know the boiler is correctly sized for their home, the radiators will get properly warm, and the install meets current regulations. Answer the question they are actually asking, which is nearly always: will this be safe, will it be warm, and will it last?
Back it up with proof
However tidy the document, your own claims only travel so far with a cautious customer. A line from a long-standing client can tip a wavering decision your way. Social proof does not need to be a full case study. A sentence and a customer name often do the work.
Operational fix: Keep two or three short, attributable client lines on file, sorted by job type, and drop the most relevant one into each proposal.
Win More Work With a Reusable Heating Proposal Template
Most heating firms cannot tell you their proposal conversion rate, because they have never tracked it. You cannot improve a number you do not measure, and building a reusable heating proposal template is the first step toward measuring it.
If your team rebuilds every bid from a blank page or wrestles estimates together in spreadsheets, you are losing hours you could put back into billable work. This is where a connected platform changes the maths. BigChange job management software for heating engineers lets you build professional quotes from reusable templates and pre-built assemblies for your common job types, then carries an approved quote straight through to a scheduled job and an invoice without rekeying a thing. With Real-Time Job Costing and Margin Tracking, you see true profitability on every job and contract as it happens, so you can price the next proposal from real numbers rather than guesswork. Because scheduling, the mobile app, certification, and invoicing live in one platform, the full job lifecycle from survey to commissioning certificate sits in a single system, with a Centralised CRM holding every property's appliance, service, and certificate history behind the next proposal you write.
Approved quotes convert into scheduled work, certificates and commissioning records stay tied to the property, and your proposals reach inboxes while slower competitors are still adding up materials by hand.
Ready to see how that works for your business? Book a BigChange demo and see how fast a professional heating proposal can go from survey to signature.
Frequently Asked Questions About Heating Proposals
What is a heating proposal template?
A heating proposal template is a reusable document structure that turns a job estimate into a professional, client-ready bid. It standardises the sections every proposal needs: your Gas Safe registration and the client's details, a survey summary, a detailed scope of works, an appliance and materials specification, a labour and pricing breakdown, programme dates, warranties, certification, and an acceptance signature. Using a template means each bid is consistent, quicker to produce, and easy to track for conversion.
What should a heating proposal include?
A heating proposal should include eleven core elements: company and client details with your Gas Safe Register number, a survey summary of what you found, a detailed scope of works, an appliance and materials specification, a labour breakdown by stage, an itemised pricing table, optional good-better-best tiers, a programme with commissioning milestones, workmanship and manufacturer warranties, terms and conditions, and an acceptance block with e-signature. The scope and pricing sections carry the most weight, because they are what clients compare most closely.
What is the difference between a heating quote and a heating proposal?
A heating quote gives a client a price, while a heating proposal sets out the full scope, terms, and conditions of the job alongside the price. A quick quote suits a single fault or part swap. A proposal is the right tool once a job involves a full system replacement, a commercial client or managing agent comparing bids, phased works, or funded and notifiable work such as a Boiler Upgrade Scheme heat pump install. The proposal is the document that wins competitive work and defines what you will be held to.
How long should a heating proposal be?
A typical domestic heating service proposal should run four to six pages. Larger commercial tenders can extend further when the scope genuinely demands it, but proposals that push past roughly a dozen pages tend to bury the detail that actually wins the job. Aim for a document long enough to specify the scope, appliances, and pricing clearly, and short enough that a busy client can read it in full.
How can I make my heating proposals win more work?
You can win more work by leading with what you found on the survey, specifying the scope and appliances in detail, breaking pricing down transparently, and translating technical detail into plain language. Enabling electronic signatures and adding a short client testimonial both lift close rates. Tracking your proposal conversion rate, then building reusable templates so every bid is fast and consistent, lets you improve the figure over time rather than guessing at it.