Lewisham · SE13 · Greater London
Get a fixed-price quote for a new boiler online and have a Gas Safe registered engineer fit it at your Lewisham home or flat – often as soon as the next day. Replacement gas boilers in Lewisham cover combi swaps, system boilers, back boiler removals and complete heating upgrades.
Lewisham has converted Victorian terraces, villas in Blackheath and Sydenham, and conservation areas in Brockley and Telegraph Hill. Across the borough’s SE postcodes we fit Worcester Bosch, Vaillant, Ideal, Baxi and Viessmann boilers.
Converted terraces are mostly flats, which usually need a compact combi like the Vaillant ecoFIT pure with a carefully planned flue. In the Brockley and Telegraph Hill conservation areas we avoid front-facing flues where we can. Larger villas in Blackheath and Sydenham often suit a Worcester Bosch or Viessmann system boiler.
Replacement boiler prices in Lewisham depend on the building. A flat in a converted Brockley terrace, a Blackheath villa and a semi in Lee each need different boilers, and flue routes, pipework and controls all move the figure. Like-for-like combi swaps start from £1,759 fitted, while Worcester Bosch Greenstar 4000 packages start from around £2,450. The price on your online quote is the price you pay. The only change would be one you ask for yourself.
| Installation type | What’s involved | Price from | Time on site |
|---|---|---|---|
| Like-for-like combi swap | Replace an existing combi in the same position, with new flue, filter and controls | £1,759 | 1 day |
| Conventional or system to combi | Remove tanks and cylinder, cap off pipework, fit combi and upgrade gas supply if needed | £2,350 | 1–2 days |
| Back boiler replacement | Remove back boiler and fire, make good, fit new boiler in a new location | £2,795 | 2+ days |
| System boiler with cylinder | Suited to larger homes with multiple bathrooms; new or replacement unvented cylinder | £2,995 | 1–2 days |
| Boiler relocation | Move the boiler to a loft, garage or new room with new gas, flue and condensate runs | £2,250 | 1–2 days |
These are starting prices for a standard installation by a Gas Safe registered engineer; your online quote confirms the exact cost for your home.
Get a new boiler on finance in Lewisham from £23.26 a month. As an example, a £1,799 boiler spread over 10 years at 9.9% APR works out at £23.26 per month. Subject to status, you can pick a shorter term, interest-free finance or buy now, pay later. See our boiler finance options for the full details.
Lewisham’s housing is mostly Victorian and converted. These are the jobs we fit most, and what suits each.
A compact combi keeps the footprint small, with the flue route and freeholder’s rules checked first.
Whole-house terraces often suit a system boiler and cylinder, giving good pressure on every floor.
Like-for-like swaps with new controls and a filter give the best value in these interwar homes.
Local boiler installers
Lewisham is a south-east London borough of Victorian and Edwardian terraces around Brockley, Ladywell and Forest Hill, large villas on the slopes of Sydenham and Blackheath, and 1930s semis in Lee and Downham. Deptford’s riverside has new developments, while Catford’s town centre and surrounding estates add post-war housing.
A large share of Lewisham’s homes are converted flats with shared walls and limited flue routes. When we price replacement boiler in Lewisham we check the building, the flue exit and the hot water demand first, so the fixed price covers a boiler that suits it.
With your boiler and installation day chosen online, a Gas Safe registered engineer arrives to strip out the old boiler, fit and commission the new one, register the warranty and notify Building Control, so everything is signed off before they leave.
Lewisham is south-east London’s Victorian heartland, with terraces, villas and a lot of converted flats. Here is what we see most.
Lewisham tap water is very hard, so scale is a constant risk for combi boilers. With a combi, we check hardness for your postcode and fit a scale reducer if it’s over 200ppm.
Many terraces here are split into flats with tight boiler cupboards and shared flues. We survey the building and lease before quoting.
Large houses on the hills often need a system boiler and cylinder to keep several bathrooms supplied.
Both have design controls that can affect flue positions. We choose a discreet route and flag any consent needed.
Interwar semis often suit a straightforward combi swap. We check mains flow first, then add a filter and new controls.
Newer flats may have specified boilers and warranty conditions. We work within them and check flue routes against building rules.
Our Gas Safe engineers cover the whole borough, from Lewisham and Deptford to Catford, Brockley, Forest Hill and Blackheath. See all our service areas.
Red pin: Lewisham town centre. Green pins: nearby towns we cover — tap a pin to see how far each town is from Lewisham. The shaded circle shows roughly 8 miles around Lewisham.
We also cover London as a whole, plus neighbouring Bromley (about 4 miles), Lambeth (about 5 miles) and Bexley (about 6 miles).
Often as soon as the next day, depending on the boiler you choose and engineer availability in the SE13 area. Complete the online quote, choose a date that suits you, and if you have no heating or hot water we put your booking first.
All SE13 postcodes plus SE3, SE4, SE6, SE8, SE12, SE23 and SE26, including Brockley, Catford, Deptford, Forest Hill and Blackheath, and nearby areas such as Bromley, Southwark and Greenwich. As part of a nationwide Gas Safe engineer network, we can also help outside these areas.
Lewisham tap water is very hard, usually above 200ppm. You can check your postcode on your supplier’s hardness checker. Where it exceeds 200ppm we fit a scale reducer with a combi boiler, as Building Regulations guidance advises.
Yes. If you have a back boiler, we take out the unit and the fireplace it’s built into and cap off the old flue and pipes safely. From there, a condensing boiler is installed in a position chosen at survey. Expect it to run longer than a simple swap. We confirm the timescale before we start.
A boiler replacement is notifiable under Building Regulations, which your Gas Safe registered engineer handles, with a compliance certificate to follow. Planning permission is not normally needed for a like-for-like swap, but in Blackheath, Brockley and Telegraph Hill there are conservation areas, so check with Lewisham Council before moving a flue to a front wall.
Yes. Boiler finance in Lewisham includes interest-free, 9.9% APR and buy now, pay later options, with deposits from £0 – see our boiler finance page. All finance is subject to status.
Yes. The engineer disconnects the old boiler, removes it and disposes of it responsibly, together with unneeded tanks or cylinders when you switch to a combi.
All boilers we install come with a manufacturer-backed warranty, typically between 5 and 10+ years depending on the model. Keeping it valid usually means an annual service – our boiler cover plans take care of that for you.
Yes. We also replace oil and LPG boilers for properties that aren’t on the gas grid. Oil work goes to OFTEC registered engineers; LPG work goes to Gas Safe registered engineers with LPG competence. See our oil boiler installation and replacement and LPG boiler installation and replacement pages for more detail.
Tell us about your home, see fixed-price replacement boiler packages for Lewisham and book the installation date that suits you – all online, in a few minutes.