How Much Does a New Boiler Cost in 2026? (Chorley & Lancashire)
Real installed prices for Worcester Bosch, Viessmann, Ideal and Baxi combis in 2026 — including flush, filter, smart stat and Gas Safe registration.
Boiler prices change constantly — manufacturer cost increases, copper price swings, even the cost of nitrogen for pressure-testing has crept up. Here's what an installed combi swap actually costs for boiler installation Chorley, boiler installation Preston and boiler installation Leyland as of spring 2026, with no hidden extras.
What 'fully installed' should always include
Before you compare quotes, check that every price includes: the boiler itself, full Gas Safe installation, a magnetic system filter (Adey MagnaClean or Fernox TF1), a thorough chemical system flush, a smart or programmable thermostat, all required certificates, Gas Safe and Building Control notification, and the manufacturer's extended warranty registered on the day. If any of these are missing, the headline price isn't comparable.
Budget tier (Ideal, Glowworm) — £1,995–£2,495
A like-for-like Ideal Logic Max Combi 30kW swap in a Lancashire 3-bed semi typically lands at £2,195–£2,395 fitted. Add £150 for a vertical flue (most lofts), £200 if the gas pipe needs upsizing from 15mm to 22mm (common on older installs). 10-year warranty included.
Mid tier (Baxi, Worcester 4000) — £2,395–£2,895
The Worcester Greenstar 4000 30kW is our most-fitted boiler in this bracket and lands around £2,595 fitted on a straightforward swap. The Baxi 800 30kW is slightly cheaper at around £2,495. Both come with 10-year warranties.
Premium tier (Viessmann, Worcester 8000) — £2,895–£3,895
A Viessmann Vitodens 100-W 30kW typically installs at £2,995–£3,195 with the full 12-year warranty. A Worcester 8000 Style 35kW (the glass-fronted model) is around £3,495 fitted.
Add-on costs to budget for
Boiler relocation (e.g. airing cupboard to kitchen): £400–£800. Conversion from regular to combi: £600–£1,200 (removing tank and cylinder, capping pipes). Heavy-duty approved chemical flush on a badly sludged system: £400–£600 (only needed if the system is heavily sludged). Unvented cylinder for system boilers: £900–£1,400 fitted depending on capacity.
How to avoid the three most common rip-offs
1. 'Free' smart thermostats that turn out to be a cheap unbranded unit — insist on Hive, Nest or Tado by name. 2. Quotes that exclude the chemical flush — without it your warranty is void. 3. Day-of-work 'discoveries' that add £500 — a proper survey should price the gas pipe run, flue route and condensate before you commit.
Our online quote builder gives you fast online boiler quotes with a fixed all-in price based on your property type, current setup and chosen boiler. No callbacks, no surprises, no high-pressure salesperson on your sofa for two hours.