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A new boiler is a job where the right choice, a legal install and a properly prepared system matter as much as the appliance. Find verified Gas Safe engineers covering Catford below, each checked before listing. Skip to verified engineers ↓
✅ 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
⚠️ Smell gas or suspect carbon monoxide?* Leave the property and call the National Gas Emergency Service on 0800 111 999 from outside — don’t touch switches or use flames. Gas & CO safety →
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On this page
Choosing the boiler · What the law requires · The flue question · Preparing the system · Safety first · Landlords & tenants · Finding a trusted installer · Costs · FAQs
Choosing the right boiler for the property
The best boiler depends on the building, not the brochure — and Catford’s mix of Edwardian and Victorian houses, inter-war homes and newer town-centre flats means there’s no single answer. A combi heats water on demand with no cylinder, suiting smaller homes and flats with one bathroom and limited space. A system boiler works with a hot-water cylinder and copes better with higher demand — several bathrooms drawing at once, common in Catford’s larger period houses. A regular (heat-only) boiler keeps the traditional tank-and-cylinder arrangement, and some older Catford homes may still run one — where replacing it can involve the airing cupboard, loft tanks and old radiator circuits, not just the boiler on the wall.
Switching type — a regular system to a combi, say — is a bigger job than a like-for-like swap, because it changes how hot water is delivered and often means removing tanks and re-running pipework. Whatever the type, a proper survey should check gas-pipe sizing, the flue route, the condensate route, hot-water demand, radiator and system condition, controls and water quality before a boiler is recommended; our Combi vs System Boiler guide helps you weigh it up. If you’re considering a lower-carbon route, an air-source heat pump is a different option with its own grant support and suitability checks — worth raising with your engineer.
What the law requires
Installing a boiler isn’t just a plumbing job — it’s notifiable building work, and cutting corners causes real problems when you sell.
A Gas Safe registered engineer. Only a Gas Safe registered engineer may install a gas boiler; the Gas Safe Register is the official list of those legally allowed to do it. Ask to see the seven-digit ID card before work starts.
Building Regulations notification. A boiler is a heat-producing appliance, so the local authority — here, Lewisham — must be told. Gas Safe Register explains that a registered engineer self-certifies by notifying through Gas Safe within 30 days, Gas Safe informs the local authority, and a Building Regulations Compliance Certificate is sent to the property within 10–15 working days. That certificate belongs to the property — keep it, because a buyer’s solicitor or a mortgage lender will ask for it. Installing a boiler outside this route is not legal.
Boiler Plus 2018. New gas boiler installations in England must meet the Boiler Plus standard. The government’s Boiler Plus factsheet sets a minimum seasonal efficiency of 92% ErP, requires time and temperature controls on all gas and oil boilers, and requires every new combi to include one additional efficiency measure — flue gas heat recovery, weather compensation, load compensation, or a qualifying smart control. A compliant modern install often also means upgrading the controls or adding thermostatic radiator valves.
Commissioning and warranty. On completion you should end up with the Benchmark commissioning record, the Building Regulations Compliance Certificate, the registered warranty, a controls handover and a service schedule.
The flue question — where Catford’s conservation streets bite
Every new boiler needs a flue, and its position isn’t always a free choice. If your property sits in a conservation area or is listed — check with Lewisham’s planning service — the flue is constrained. Catford’s Culverley Green conservation area, designated in 1990 around Lewisham Road and Canadian Avenue, carries Article 4 directions on specified streets that remove permitted-development rights, so more external work needs planning permission there. The Planning Portal adds that in a conservation area a flue should not be fitted on the principal or side elevation if it fronts a highway; on a listed building, Listed Building Consent is likely needed even where permitted-development rights would otherwise apply; and for flats and maisonettes those rights don’t apply at all. Even outside protected streets, a flue terminal must clear windows, doors and boundaries. A verified engineer plans the flue route before choosing where the boiler goes.
Preparing the system — the step that protects a new boiler
A new boiler fitted onto a dirty old system is a common reason for early problems and disputed warranty claims. Building Regulations Approved Document L states that before a new heating appliance is installed the central heating and primary hot-water circuits should be thoroughly cleaned and flushed, and that in hard-water areas suitable measures should be taken to protect against scale and corrosion, with systems prepared and commissioned to BS 7593. In practice that means a chemical clean and flush to lift out the magnetite sludge decades of corrosion leave behind, a permanent in-line filter, the correct inhibitor, and — given Thames Water confirms the whole region is hard — a scale-reducing measure. On the older systems common in Catford’s period streets this pre-install clean is often the difference between a boiler that lasts and one that struggles from year one; the deeper remedial clean of a badly sludged system is on Central Heating Repair.
Safety first
If you smell gas or suspect a leak, follow the National Gas Emergency Service steps in order:
1. Don’t switch anything electrical on or off, don’t use a naked flame, don’t smoke, and don’t use a mobile near the suspected leak.
2. Open doors and windows if it’s safe to do so.
3. If the meter control handle is safely reachable, turn the gas off at the meter — unless the meter is in a cellar.
4. Leave the property if the smell is strong or you feel unwell.
5. Call the National Gas Emergency Service on 0800 111 999 from outside, and don’t go back in until an engineer gives the all-clear.
A correctly installed boiler is the first defence against carbon monoxide. London Fire Brigade says CO comes from boilers that are faulty, badly fitted or poorly maintained, or where flues and vents are blocked — which is exactly why a competent install and a correct flue matter — and recommends an audible CO alarm in any room with a fuel-burning appliance. If you suspect carbon-monoxide poisoning, get into fresh air and seek medical advice — contact NHS 111, or call 999 or go to A&E for severe symptoms — and report it on 0800 111 999. After a new install, keep to an annual service and safety check; see Boiler Servicing.
Landlords and tenants
Private landlords. Once a new boiler is installed the ongoing duty applies: under the Gas Safety (Installation and Use) Regulations 1998, HSE requires an annual gas safety check by a Gas Safe registered engineer within 12 months of installing a new appliance and annually after, with the record given to tenants within 28 days and kept for two years.
Tenants. A boiler replacement is the landlord’s responsibility, or the council’s in a council home. In a Lewisham council home in SE6, gas and heating work is handled by the council’s contractor BSW (0800 090 2360 / 0208 763 3966); a private tenant should report to the landlord or agent first, and Lewisham can step in if the landlord doesn’t act.
Finding a trusted installer in Catford
Two checks protect an expensive, safety-critical job. Verify the engineer or business on the Gas Safe Register by the seven-digit licence number and ask for the ID card; and for wider assurance, WaterSafe lists approved plumbing contractors and TrustMark is the Government-endorsed quality scheme. Note that Lewisham doesn’t publish a council-approved plumber list, so a “council-approved” claim shouldn’t be taken at face value — check the register instead.
What a boiler installation costs in Catford
A rough orientation to sense-check a quote — not a price list. No official pricing exists; always get written quotes.
| Job | Typical indicative range | Notes |
|---|---|---|
| Like-for-like combi swap | £1,800–£3,000 | Similar position; includes controls and filter |
| System or regular boiler replacement | £2,200–£3,800 | With cylinder; varies by size and layout |
| Regular-to-combi conversion | £3,000–£4,500+ | Removing tanks, re-piping, added labour |
| System flush + filter at install | £300–£600 | Pre-install clean; protects the new boiler |
Editorial estimate only — not regulated rates, market data or a cost survey. Actual quotes vary by make and output, boiler type, flue and pipe routing, system condition and access. Catford is inside the London ULEZ, so a non-compliant van may carry the £12.50 daily charge; check the current position.
Why directory-listed engineers
A boiler install is expensive, safety-critical and legally regulated — and the corners that get cut are the ones you discover when you sell or when a warranty is refused. Every engineer listed for Catford is checked for identity, insurance and trading presence before going live and rechecked annually, with Gas Safe registration confirmed directly where gas work is involved. These listing checks are administrative and don’t replace your own checks or guarantee workmanship; ask to see the ID card. You contact the engineer directly: no lead fee, no per-enquiry charge, and no pay-to-play ranking, with any Sponsored placement labelled. Workmanship guarantees of 1, 3, 6 or 12 months are set by the plumber and aren’t insurance-backed unless stated; your Consumer Rights Act 2015 rights still apply.
Frequently asked questions
Yes. Your Gas Safe registered engineer notifies the installation and you should receive a Building Regulations Compliance Certificate for the property within 10–15 working days, plus a Benchmark commissioning record. Keep the certificate — you’ll need it when you sell or remortgage.
Yes. Boiler Plus 2018 requires new gas boilers in England to be at least 92% ErP efficient, with time and temperature controls, and every new combi must include one extra efficiency measure such as weather compensation or a smart control.
It should. Approved Document L says the system should be cleaned and flushed and prepared to BS 7593 before a new boiler goes on, plus an in-line filter and inhibitor — important on Catford’s older systems, and often a warranty condition.
Not necessarily. Culverley Green is a conservation area with Article 4 directions, so external work is more tightly controlled; a flue can’t go on a highway-fronting principal or side elevation, listed buildings need consent, and flats don’t get permitted-development rights. Check with Lewisham planning.
Usually yes, but it’s a bigger job — tanks come out and pipework changes, which affects hot-water delivery. Size it properly for the home; see our Combi vs System guide.
No. A replacement is the landlord’s responsibility, or the council’s (BSW) in an SE6 council home; report it first and the council can step in if a private landlord doesn’t act.
Boiler installation across Catford — areas covered
Catford sits within the London Borough of Lewisham, alongside Rushey Green, Bellingham, Hither Green, Ladywell, Lewisham, Forest Hill and Downham. Browse all local coverage from the Lewisham plumbers hub.
Related services in Catford
Boiler Repair · Boiler Servicing · Central Heating Repair · Emergency Plumber · General Plumbing
Related guides
Combi vs System Boiler · Boiler Repair or Replace · London Hard Water Guide · Landlord Plumbing Compliance Checklist
A new boiler is only as good as the choice, the install and the system behind it. Get the type right for the property, the flue right for the setting, and the system cleaned before it goes on — and you get a boiler that lasts, stays under warranty, and passes cleanly when you sell. Guarantees vary; confirm with your engineer.
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Source provenance
Regulatory and safety guidance on this page is drawn from primary UK sources: Gas Safe Register (legal requirement for gas work and Building Regulations certification), GOV.UK (Boiler Plus and Approved Document L), the Health and Safety Executive (landlord gas-safety duties), the National Gas Emergency Service (0800 111 999), London Fire Brigade (carbon monoxide guidance), Thames Water (hard-water region), the Planning Portal (flue rules) and the London Borough of Lewisham (Culverley Green conservation area and rented-boiler routing). BS 7593:2019+A1:2024 is the British Standard code of practice for domestic heating-system water. Cost figures are an editorial estimate only.
Last reviewed: July 2026 by Adiel Khan — SFEDI-accredited business advisor, 20+ years’ experience (South East Enterprise Ltd) and operator of VerifiedPlumbers. LinkedIn ↗
This page is checked for compliance and regulatory accuracy against the bodies cited on it — Gas Safe Register, GOV.UK, the Health and Safety Executive, the National Gas Emergency Service, London Fire Brigade, Thames Water, the Planning Portal and the London Borough of Lewisham. Source links are provided within this page where relevant.
Sources & further reading
- Gas Safe Register — Building Regulations certificates
- Gas Safe Register — official register of gas engineers
- GOV.UK — Boiler Plus factsheet
- GOV.UK — Approved Document L: Conservation of fuel and power (Vol 1)
- HSE — Gas safety: landlords and letting agents
- Planning Portal — Flue, chimney or soil and vent pipe: planning permission
- London Borough of Lewisham — Culverley Green conservation area
- Thames Water — Hard water
- London Borough of Lewisham — Gas and electrical safety (private tenants)