How to Quote for Gas Engineering Work
Knowing how to quote for gas engineering work accurately is what separates a profitable heating business from one that stays busy but doesn’t build margin. Gas engineering quotes need to be detailed enough to prevent scope disputes, fast enough to win jobs over competitors, and professionally presented enough to justify your rates. This guide covers exactly how to quote for gas engineering work – from the site visit to the final document.
How to Quote for Gas Engineering Work: Types of Jobs
Quoting for gas engineering work varies by job type:
Boiler installations: Fixed price based on surveyed boiler and system requirements. Never quote a boiler installation without a site visit. Flue routing, system condition, and access all affect the price significantly.
Annual servicing and CP12: Fixed price per job. Build a service price list and quote consistently.
Emergency repairs: Minimum call-out charge plus hourly rate. Quote clearly before starting work – agree an authorisation limit upfront for unknown-scope emergencies.
System installations (full central heating): Detailed itemised quote covering pipework, radiators, boiler, controls, and commissioning. These are large-value jobs requiring a formal written quote.
What a Professional Gas Engineering Quote Should Include
A professional gas engineering quote should contain:
- Your business details – company name, address, Gas Safe registration number, VAT number
- Customer details and property address
- Job specification – exactly what work is being done
- Boiler details (if applicable) – make, model, output rating, efficiency rating
- System components – filter, scale reducer, inhibitor, flue specification
- Controls – thermostat, programmer, TRVs, smart controls
- What’s included – commissioning, Building Regulations certificate, Gas Safe notification, warranty registration
- What’s NOT included – decoration making good, drain-down of existing system (if separate), customer-supply items
- Price and payment terms – deposit amount, staged payments if applicable
- Guarantee terms – boiler manufacturer warranty, your workmanship guarantee
- Quote validity period – 30 days is standard (boiler prices fluctuate)
Critical for compliance: Every boiler installation quote must confirm that the installation will be notified to Building Control and a Gas Safe completion certificate issued. This reassures customers and demonstrates professional standards.
Current UK Gas Engineering Rates 2026
| Gas engineering job type | Typical price |
|---|---|
| Annual boiler service | £75-£130 |
| CP12 Landlord Gas Safety Certificate | £65-£130 |
| CP12 + boiler service (combined) | £110-£180 |
| Powerflush (3-bedroom house) | £350-£650 |
| Replace radiator | £150-£300 |
| Gas fire service | £65-£110 |
| Combi boiler replacement (installed) | £1,800-£3,500 |
| System boiler replacement (installed) | £2,000-£4,200 |
| Full central heating installation | £4,000-£9,000 |
Source: Checkatrade gas engineer costs, MyJobQuote, 2026.
Common Quoting Mistakes Gas Engineers Make
Not surveying before quoting boiler installations: Quoting a boiler job from a description over the phone without seeing the property is the most common source of variation between quote and actual cost. Always survey.
Not specifying the flue route: Flue routing complications (extra bends, extended flue, twin flue) add real cost. Specify the planned flue route in your quote.
Forgetting commissioning time: Commissioning a new boiler properly – running system checks, setting flow temperatures, balancing radiators, registering warranty – takes 1-2 hours that must be priced.
Not stating payment terms: State your deposit amount, when the balance is due, and accepted payment methods in every quote. Ambiguity on payment terms causes problems at completion.
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Frequently Asked Questions
How should I quote for gas engineering emergencies?
State your emergency call-out fee and hourly rate clearly before attending. On arrival, assess the job and give the customer an indicative cost before starting. For unknown-scope work, agree a maximum spend authorisation limit. Always photograph the issue before and after repair.
Should I charge VAT on gas engineering work?
If you’re VAT registered (mandatory above £90,000 turnover, voluntary below), yes. See HMRC’s VAT guidance for heating engineers – certain energy-saving heating work may attract different VAT rates.
How quickly should I send a boiler installation quote?
Within 24 hours of the survey, ideally the same day. Customers typically request 2-3 quotes simultaneously and make decisions within a week. The first professional, complete quote often wins regardless of being the most or least expensive.
What information do I need from the survey to quote a boiler installation?
Existing boiler make, model, location, and flue route; property type and number of radiators; water hardness (for scale reducer specification); electrical supply to boiler location; any access restrictions; customer’s preferred boiler brand and budget.
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Related reading:
- Is 2026 a Good Year to Start a Trades Business in the UK?
- How Much Should a Tradesman Charge Per Hour in the UK? (2026 Guide)
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