Verified boiler installation engineers across Wandsworth — like-for-like combi swaps, system conversions, boiler relocations, Boiler Plus–compliant installs. Covering SW4, SW8, SW11, SW12, SW15, SW16, SW17 and SW18. Find directory-listed engineers below.
✅ Checked before listing — identity, insurance, trading presence, Gas Safe (where relevant).
How we verify →
✅ Workmanship guarantee badges on listings — 1, 3, 6 or 12 months
Listed specialists set their own response times and prices — confirm both before booking.
Contact verified boiler installation engineers in Wandsworth ↓
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No paid placements go live without verification — listing comes after checks, not before.
When you call: describe your current boiler (make, model, age), property type, any issues, and what you think you need (like-for-like swap, conversion, relocation). The engineer may arrange a survey or ask for photos before issuing a written quote.
About this service –
Understanding boiler installation in Wandsworth
What kind of install are you pricing?
A new boiler install is one of the biggest plumbing purchases a household makes — from a like-for-like combi swap in a Southfields semi to a full system conversion in a Battersea conversion flat. Understanding what kind of install you’re pricing, and what a complete quote should include, is the difference between comparable quotes and hidden extras.
- Like-for-like swap → same boiler type, same location. Usually a 1-day job.
- System conversion → e.g. regular boiler with tank/cylinder converted to a combi. Typically 2–3 days.
- Relocation → moving the boiler. Adds flue routing, pipework and often controls upgrades.
- Controls or Boiler Plus upgrade → meeting the minimum energy-saving measures required on new combi installs in England.²
If you’re weighing repair vs replacement before committing to a new install, see our Should I Repair or Replace My Boiler? guide.
What your quote should include — before you agree to anything
- Boiler make, model and expected manufacturer warranty period
- Controls (programmer, room thermostat, Boiler Plus measure)
- Flue components and routing
- System flush or chemical clean where required by system condition or manufacturer warranty
- Scale inhibitor / magnetic filter if required by warranty
- Building Regulations notification handled by the engineer
- Warranty registration with the manufacturer
- Making good (flooring, tiling, pipework boxing)
A longer warranty is only useful if the installation meets the manufacturer’s conditions. Ask which filters, flushing, scale protection and registration steps are required for the warranty to apply — a cheaper quote that skips these may leave you without cover.
Get it in writing. You contact the engineer directly, describe your property and current system, and the engineer may arrange a survey or ask for photos before issuing a written quote. Compare quotes, then decide whether to book.
Before any engineer begins gas work, ask to see their Gas Safe ID card and check the back of the card for the specific gas work categories they are qualified for.³
Gas Safe registration and Building Regulations — the legal requirements
Under the Gas Safety (Installation and Use) Regulations 1998, gas work must be done competently — and anyone carrying out gas work as a business or contractor must be Gas Safe registered.⁴ For a new boiler installation, use a Gas Safe registered engineer competent for the specific appliance category. This is confirmed by the HSE’s domestic gas guidance.³
New boiler installations must also be notified under the Building Regulations.
Keep the Building Regulations Compliance Certificate — it belongs to the property and is often requested when you sell your home or remortgage.⁵
Before work begins, verify the engineer’s registration and work categories at gassaferegister.co.uk.⁶
Boiler Plus — what the law requires for new combi installations in England
The core requirements:
- New and replacement gas boilers must meet minimum efficiency standards (typically 92% ErP for most domestic gas boilers under Boiler Plus).²
- Time and temperature controls (typically a programmer and room thermostat) must be installed with all new gas and oil systems.²
- When a combi boiler is installed, one of the following additional energy-saving measures must also be fitted: flue gas heat recovery, weather compensation, load compensation, or a smart control with automation and optimisation.²
Boiler Plus applies across England, including all Wandsworth postcodes. Installations must comply with these Building Regulations requirements.²
Ask your engineer which measure they’re specifying for your combi install and why — the answer should reflect your property type, existing controls and household use patterns.
What to expect from a new boiler installation in Wandsworth
A good installation quote starts with a survey — existing system type, boiler location, flue routing, hot water demand, number of bathrooms, available gas supply and any controls upgrade needed.
Swap-for-swap combi installs in standard properties are typically one-day jobs. System conversions — switching from a regular boiler with a cold water tank and cylinder to a combi, for example — usually take two to three days.
Wandsworth’s housing mix affects what an installer finds on site:
Victorian and Edwardian terraces in Tooting, Balham, Earlsfield, Southfields and parts of Battersea — many have had combi boilers retrofitted into older pipework over the years. System conversions from original gravity-fed layouts to combi are common here, and older microbore pipework sometimes needs partial replacement to meet modern flow rates.
Inter-war semis in Southfields and Furzedown — often still running regular boiler + cylinder + loft tank layouts. Converting to combi frees up airing cupboard and loft space, but requires confirmation that mains water pressure and flow rate can support the chosen boiler.
Conversion flats across Clapham South, Balham, Battersea and Putney — flue routing is the first thing an engineer surveys. Shared walls, windows, nearby vents and leasehold restrictions all constrain where a flue can exit, and a boiler relocation sometimes follows.
Post-war council blocks — different route (see council section below).
Modern high-density new-build around Nine Elms and Battersea Power Station — typically unvented cylinders with system boilers or centralised district heating rather than conventional combi boilers. Installation or replacement of an unvented hot water cylinder is controlled under Approved Document G and should be carried out by a competent person, typically an engineer with recognised G3/unvented hot water competence.⁷ Notifiable installation or replacement work must be notified to Building Control or self-certified through a competent person scheme. For servicing or repair, ask for evidence of appropriate unvented/G3 competence and a written service/repair record.
For older systems, a power flush or chemical clean before fitting the new boiler is often recommended to protect the warranty and prevent early failures. Confirm whether this is included in the quote or charged separately, and whether it’s required under the chosen boiler’s warranty terms.
Register the warranty with the manufacturer after installation — some require this within a set window for the full warranty period to apply. Check the terms for your specific boiler.
Hard water and new boiler installations in Wandsworth
Wandsworth sits in Thames Water’s hard water area. Thames Water confirms hard water can lead to limescale build-up on household appliances and fittings⁸ — a factor in the long-term performance of any new boiler across Wandsworth postcodes.
Some boiler manufacturers require or recommend a scale inhibitor and/or magnetic system filter in hard water areas for the warranty to remain valid. Ask your engineer which products they propose to fit, where they go in the system, and which are required by the chosen boiler’s warranty terms.
A new boiler is the right moment to fit these measures — adding them later usually means draining the system a second time.
Council tenants in Wandsworth — boiler replacements
If you live in a Wandsworth Council home with a council-owned boiler, do not arrange a private replacement. Boiler replacements are handled through the council’s planned maintenance programme and its appointed gas contractors, not by private arrangement.
If your council-owned boiler is failing, report it to the relevant contractor for your area:⁹
- Battersea, Wandsworth town or Earlsfield → PH Jones: 033 3004 2333 or 080 0023 4069
- Putney, Roehampton or Tooting → T. Brown: 080 0977 8472 or 020 8786 1244
- Wandsworth Council block with centralised heating and hot water (paying heating and hot water charges) → Smith & Byford: 020 8722 3431 or 080 8196 1791
If you aren’t sure which contractor covers your property, contact your area housing team.¹⁰
Under the Gas Safety (Installation and Use) Regulations 1998, as your landlord the council must then arrange an annual gas safety check by a Gas Safe registered engineer and provide you with a copy of the Landlord Gas Safety Record.⁴ ¹¹ The document is sometimes called a “CP12” — there is no legal document called a “CP12”; that is an industry term for the Landlord Gas Safety Record.
Communal heating and district heating in Wandsworth
A number of Wandsworth council estates are served by communal (centralised) heating and hot water systems rather than individual boilers in each flat.¹² On these systems, there is no individual boiler in your flat to replace — the plant supplying the whole block is the council’s responsibility and is maintained by Smith & Byford (contact details above).⁹
In Nine Elms, Battersea Power Station and similar newer high-density developments, many flats are connected to private-sector district heating networks. Residents have a heat interface unit (HIU) in each flat rather than a boiler — HIU replacement or repair is handled by the development’s appointed maintenance contractor, not a general boiler installation engineer. Check with your managing agent before contacting anyone else.
The council is regenerating the Winstanley and York Road estates in Battersea and the Alton estate in Roehampton. If you live on either estate, see the council’s Winstanley and York Road regeneration page¹³ or Alton regeneration updates¹⁴ for the current position on heating and hot water system type.
Private tenants and landlords in Wandsworth — landlord responsibility for boiler installations
A boiler installed by a landlord forms part of the gas installation the landlord is legally responsible for maintaining.
Under the Gas Safety (Installation and Use) Regulations 1998, the landlord must arrange annual gas safety checks by a Gas Safe registered engineer after installation and provide the tenant with a copy of the Landlord Gas Safety Record within 28 days of the check being completed.⁴
If you are a private tenant and your landlord replaces the boiler during your tenancy, you can ask to see the Building Regulations Compliance Certificate for the new install — the certificate belongs to the property.⁵
Wandsworth Council states that if your boiler is broken, you must contact your landlord or agent first, and the landlord or agent should respond within 48 hours to acknowledge your report and confirm when an engineer will visit.¹⁶ This is council guidance, not a statutory deadline.
If your landlord does not respond or there are unreasonable delays in arranging replacement, you can report the disrepair to Wandsworth Council.¹⁷
What a new boiler installation costs in Wandsworth
Indicative internal estimates based on recent London boiler installation jobs (2025–2026), not regulated rates — no official pricing data exists for private boiler installation. Always confirm pricing before work begins. Actual costs vary by boiler make and model, property layout, existing system type, controls specified and any additional works (flue extensions, relocations, flushing). VAT may apply.
| Service | Typical range (London) |
|---|---|
| New combi boiler (like-for-like swap) | from £1,800 |
| New combi boiler (system conversion or relocation) | from £2,500 |
| New system boiler (swap) | from £2,200 |
| New regular boiler (swap) | from £2,100 |
| Power flush (often recommended with a new boiler) | from £350 |
| Smart control / Boiler Plus measure upgrade | from £200 |
Get the quote in writing and confirm what’s included — boiler, controls, flue components, scale inhibitor / magnetic filter, system flush, Building Regulations notification, warranty registration and making good.
See the full London Plumbing Costs Guide →
Why verified engineers — not a general directory
Engineers listed here for gas boiler work are Gas Safe registered. Every listing is verified at the time of listing — the checks below are completed before the profile goes live.
You contact and pay the engineer directly. This directory verifies listings before they go live, but does not carry out, manage or guarantee the work.
What we check before an engineer is listed in Wandsworth:
- Identity and trading details — we confirm the business is legitimately trading, verify the registered business name, and verify the business identity and named contact behind the listing. No anonymous profiles go live.
- Gas Safe registration — where a plumber offers gas work, we confirm their Gas Safe registration number directly with the Gas Safe Register, checked against the engineer’s name and the specific gas work categories they are qualified to carry out.
- Public liability insurance — every listed engineer is required to hold public liability insurance, and evidence of cover is checked at the point of listing.
- Service coverage — we confirm the engineer actually covers Wandsworth SW postcodes before approving the profile.
Profiles are removed if credentials lapse or credible concerns are raised.
See the full verification process — Gas Safe, insurance, identity and service area checks →.
No middleman fees — every lead goes directly to the engineer.
We limit listings per borough so every engineer gets fair, equal visibility.
Frequently asked questions — Boiler Installation Wandsworth
Yes. Under the Gas Safety (Installation and Use) Regulations 1998, gas work must be done competently — and anyone carrying out gas work as a business or contractor must be Gas Safe registered.⁴ For a new boiler installation, use a Gas Safe registered engineer competent for the specific appliance category.
The installation must also be notified under the Building Regulations, which a Gas Safe registered business does on your behalf — typically within 30 days of installation.⁵ Verify registration and work categories at [gassaferegister.co.uk](https://www.gassaferegister.co.uk/find-an-engineer/)⁶ before work begins.
Yes — Boiler Plus applies across England, including all Wandsworth postcodes.
New and replacement gas boilers must meet minimum efficiency standards (typically 92% ErP for most domestic gas boilers), and must be fitted with time and temperature controls. New combi boilers must also include one additional energy-saving measure: flue gas heat recovery, weather compensation, load compensation, or a smart control with automation and optimisation.²
Not privately. Boiler replacements for council-owned boilers are handled through Wandsworth Council’s planned maintenance programme and its appointed gas contractors.⁹
If your boiler is failing, contact the right contractor for your area: PH Jones (Battersea / Wandsworth / Earlsfield), T. Brown (Putney / Roehampton / Tooting) or Smith & Byford (council block with centralised heating). Phone numbers are in the council-tenant section above.⁹ If you aren’t sure which contractor covers your property, contact your area housing team.¹⁰
A straightforward combi swap in a standard property typically takes one day. A system conversion — for example, switching from a regular boiler with cold water tank and hot water cylinder to a combi — usually takes two to three days.
Any flue relocation, pipework changes or system flushing adds time. Ask for a clear day-by-day scope before work starts.
A Landlord Gas Safety Record (sometimes called a “Gas Safety Certificate” or “CP12”) confirms that gas appliances have been inspected and are safe to use. Landlords must arrange one every 12 months and provide a copy to tenants within 28 days.⁴
A Building Regulations Compliance Certificate is issued after a new heat-producing appliance is installed. The Gas Safe registered engineer notifies the local authority, typically within 30 days of installation, and the certificate arrives in the post within 10–15 working days of notification.⁵ It belongs to the property — keep it safe, as it’s often requested when you sell or remortgage.
Not in the same way. Many Nine Elms and Battersea Power Station developments use centralised district heating rather than individual boilers. Each flat has a heat interface unit (HIU) instead of a conventional boiler. HIU replacement is handled by the development’s appointed maintenance contractor, not a general boiler installation engineer. Check with your managing agent before arranging anything.
Flue routing is usually the main constraint. Flues must exit in approved positions relative to windows, shared walls, other flats and vents — a Gas Safe registered engineer will survey this. Leasehold terms may also restrict where or how a boiler can be sited. If the current boiler is in an awkward position, the quote may include relocation costs. Get any flue-routing questions answered at survey stage, before you commit.
Boiler Installation across Wandsworth — areas we cover
- Boiler Installation Tooting
- Boiler Installation Balham
- Boiler Installation Battersea
- Boiler Installation Clapham South
- Boiler Installation Earlsfield
- Boiler Installation Wandsworth town
- Boiler Installation Southfields
- Boiler Installation Putney
- Boiler Installation Furzedown
- Boiler Installation Streatham Park
Related services
- Boiler Repair Wandsworth
- Boiler Servicing Wandsworth
- Central Heating Repair Wandsworth
- Emergency Plumber Wandsworth
- General Plumbing Wandsworth
Related guides
- Should I Repair or Replace My Boiler?
- London Plumbing Costs Guide
- London Hard Water Guide
- How to Read a Plumbing Quote
- London Landlord Plumbing Compliance Checklist
From a like-for-like combi swap in a Tooting Victorian terrace, to a system conversion in a Southfields 1930s semi, a flue relocation in a Battersea conversion flat or a Boiler Plus–compliant combi install in a Balham end-of-terrace — every boiler installation engineer listed here is verified and covering Wandsworth SW postcodes. Gas Safe registration is checked at listing, but status can change — always verify the engineer’s ID card and current Gas Safe entry before work begins.
Contact verified boiler installation engineers in Wandsworth ↑
← Back to all plumbing services in Wandsworth
Last reviewed: May 2026 by Adiel Khan — SFEDI-accredited business advisor with 20+ years experience (South East Enterprise Ltd) and operator of VerifiedPlumbers. LinkedIn ↗
This page is reviewed against guidance published by HSE ↗, Gas Safe Register ↗, GOV.UK legislation ↗, Thames Water ↗ and London Borough of Wandsworth ↗. Source links are provided within this page where relevant.
Sources & further reading
¹ National Gas Emergency Service — 0800 111 999 (24/7 gas leak / suspected CO emergency line) ² GOV.UK (BEIS) — Boiler Plus: New standards for domestic boiler installations from April 2018 (92% ErP minimum; time and temperature controls; combi additional measure) ³ HSE — Gas safety for home owners (Gas Safe registration; ID card categories for specific gas work) ⁴ UK Legislation — Gas Safety (Installation and Use) Regulations 1998 (Regulation 3: competence universal; employees/self-employed must be Gas Safe registered. Regulation 36: landlord gas safety check duties) ⁵ Gas Safe Register — Building Regulations Compliance Certificate (engineer notifies local authority within 30 days; homeowner receives certificate within 10–15 working days of notification) ⁶ Gas Safe Register — Find a registered engineer (verify registration and work categories) ⁷ GOV.UK — Approved Document G, Sanitation, hot water safety and water efficiency (unvented cylinder installation/replacement notifiable; competent person scheme self-certification) ⁸ Thames Water — Hard water classification and postcode checker (limescale on appliances and fittings) ⁹ Wandsworth Council — Request a repair (PH Jones/T. Brown/Smith & Byford heating/hot water contractor split by area; Joint Control Centre 020 8871 8999 out-of-hours) ¹⁰ Wandsworth Council — Housing contacts (area housing teams) ¹¹ HSE — Gas safety information for landlords (annual gas safety check; landlord duties under Regulation 36) ¹² Wandsworth Council — Your rent and charges (heating and hot water charges for centralised systems) ¹³ Wandsworth Council — Winstanley and York Road regeneration plan ¹⁴ Wandsworth Council — Alton regeneration news ¹⁵ HSE — Domestic gas: frequently asked questions (landlord responsibility for appliances/fittings/flues provided for tenants) ¹⁶ Wandsworth Council — Broken boilers in private rented accommodation (48hr acknowledgment guidance; not a statutory deadline) ¹⁷ Wandsworth Council — Report a problem in your property (private tenant disrepair reporting)