How to Price a Boiler Installation in the UK (2026 Guide)
Pricing a boiler installation correctly is one of the most commercially important skills for any gas engineer running their own business. Underquote and you work hard for a loss on one of your highest-value jobs. Overquote without justification and you lose it to a competitor. This guide covers exactly how to price a boiler installation in 2026 – component costs, labour, margins, and what the market will bear.
How to Price a Boiler Installation: Breaking Down the Costs
Pricing a boiler installation accurately requires itemising every cost component:
Boiler Unit Cost
The boiler is the single largest cost component. Trade prices in 2026:
| Brand | 24kW combi (trade) | 30kW combi (trade) |
|---|---|---|
| Worcester Bosch | £700-£950 | £800-£1,100 |
| Vaillant | £650-£900 | £750-£1,050 |
| Ideal | £450-£700 | £550-£800 |
| Baxi | £400-£650 | £500-£750 |
| Viessmann | £750-£1,000 | £850-£1,150 |
Source: Worcester Bosch trade pricing, Wolseley, BSS Industrial, 2026. Prices vary by merchant and account terms.
System Components
- Standard horizontal flue kit: £40-£80
- Magnetic filter (e.g. Adey MagnaClean): £80-£150 fitted
- Scale reducer (essential in hard water areas): £50-£100
- System inhibitor (Fernox or Sentinel): £15-£30
- Fill loop and pressure gauge: £30-£60
- Sundries (pipe fittings, solder, fixings): £30-£80
Labour
A standard combi swap (same location, same type) for one engineer:
- Standard like-for-like swap: 4-6 hours
- Boiler move or flue extension: 6-8 hours
- Full system conversion (from back boiler or system boiler): 8-12 hours
At £55-£80/hr: £220-£480 labour for a standard swap.
Building the Price: Worked Example
Standard like-for-like combi swap – Worcester Bosch 28i (typical 3-bed semi):
| Component | Cost |
|---|---|
| Worcester Bosch 28i boiler (trade) | £820 |
| Standard horizontal flue kit | £65 |
| Adey MagnaClean filter | £110 |
| Scale reducer (south east – hard water area) | £80 |
| System inhibitor and commission chemicals | £35 |
| Labour – 5.5 hours @ £65/hr | £358 |
| Sundries | £55 |
| Total direct cost | £1,523 |
At 35% gross margin: customer price = £2,343
Market rate for this job: £1,800-£3,000 depending on region and brand. Our example is mid-market – appropriate margin for a quality installation with a recognised brand.
Boiler Installation Pricing by Job Type
| Job | Typical installed customer price |
|---|---|
| Combi boiler swap (like for like) | £1,800-£3,500 |
| System boiler replacement | £2,000-£4,200 |
| Combi conversion (from back boiler/cylinder) | £2,500-£5,000 |
| Heat-only boiler replacement | £1,600-£3,200 |
| New build combi installation | £900-£1,800 |
Source: Checkatrade boiler installation costs, 2026.
VAT on Boiler Installations
Standard 20% VAT applies to most boiler work. Some energy efficiency installations may attract reduced rates. Always check current HMRC guidance on VAT for energy-saving materials before quoting – the rules have changed before and may change again.
Conclusion
Pricing correctly is not about charging the most – it is about charging enough to run a sustainable, profitable business. The tradespeople who consistently undercharge are not doing customers a favour; they are putting their businesses at risk and making it harder for everyone in the industry to charge fair rates. Know your costs, add your margin, and price with confidence. For further guidance, visit Boiler guide: installation standards.
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Frequently Asked Questions
How do I price a boiler installation without seeing the property?
You can give a budget indication by phone but should never provide a fixed price without a site survey. Flue routing, system condition, existing boiler location, and building type all significantly affect the final cost. Always survey before committing to a price.
Should I include the manufacturer warranty in my boiler quote?
Yes, and make it prominent. A 10-year Worcester Bosch warranty (when registered by an accredited installer) is a major selling point. Make the warranty terms explicit in your quote – it differentiates you from cheaper competitors using budget brands.
What deposit should I take on a boiler installation?
25-30% on order confirmation is standard. This covers the boiler equipment cost before you’ve started work. On larger system installations, a staged payment (25% deposit, 25% on materials delivery, 50% on completion) gives both parties financial protection.
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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