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A new boiler is a fifteen-year decision made in a stressful week — usually the week the old one died. The Gas Safe registered engineers listed below install and replace boilers across the borough; this page covers choosing the right type for the property, what a compliant installation actually includes, and the paperwork that should exist when the van leaves.
✅ 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? Don’t touch switches — call the National Gas Emergency Service free on 0800 111 999 from outside, 24/7, before anything else.
⚠️ Boiler installation is legally restricted work: only engineers on the Gas Safe Register may install gas boilers.
Contact verified Gas Safe engineers in Richmond upon Thames ↓
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Boiler broken right now? Diagnosis first — repair may still win: Boiler Repair in Richmond upon Thames.
What this covers: new and replacement boilers — combi, system and heat-only — specification, siting, flues, system preparation and commissioning.
Combi or system? The decision framework is in our Combi vs System Boiler guide.
Coverage: the whole borough — TW1, TW2, TW9–TW12, SW13, SW14 and Hampton Wick’s KT1.
Costs: each engineer quotes directly — editorial guide below.
Jump to: Safety first · Which boiler fits the house · Sizing done properly · What a compliant install includes · Richmond wrinkles · Costs · FAQs
Safety first
If you can smell gas at any point — before, during or after any installation: don’t operate light switches or anything electrical, no naked flames, no smoking. Open doors and windows if it’s safe to do so. If you know where the gas meter is and can reach it safely, turn the supply off at the meter — unless the meter is in a cellar or basement. Leave the property if the smell is strong or you feel unwell, and call the National Gas Emergency Service free on 0800 111 999 from outside.1 Don’t go back inside until you’re told it’s safe.
The legal line: installing a gas boiler is restricted work for engineers on the Gas Safe Register2 — every engineer listed here is checked against the register before listing and re-verified annually, and the ID card on the doorstep shows what work each is qualified for. A new installation should also leave you with a carbon monoxide alarm conversation: if the boiler’s room doesn’t have a working audible CO alarm, fitting one alongside the install is the cheapest safety upgrade available.
Which boiler actually fits the house
The right boiler is a property decision before it’s a brand decision:
Combi — heats water on demand, no tank, no cylinder, mains-pressure hot water. Fits most of the borough’s flats and smaller houses, frees the airing cupboard, and suits one-bathroom life. Its limit is flow: one boiler heating water live can struggle when two showers run at once.
System boiler + cylinder — stored hot water at mains pressure, built for simultaneous demand. The natural answer for the borough’s larger family homes — multiple bathrooms in Hampton, Teddington or East Sheen semis and detacheds — at the cost of cylinder space.
Heat-only (regular) — works with tanks and gravity systems. Mostly chosen where an older system is being kept largely intact; on a full refit it’s usually the moment to decide whether the tanks themselves should go.
The choice interacts with everything this site says elsewhere: shower performance is set by this decision (Bathroom Plumbing explains the pressure question), and converting system types changes pipework, controls and sometimes the cold-water plumbing too. The full framework — including the cases where each type wins — is in the Combi vs System Boiler guide.
Sizing done properly
“Same size as the old one” is how boilers end up wrong twice. Proper sizing is a heat-loss calculation — the property’s fabric, rooms, radiators and hot-water demand — not a sticker copied from the dying unit. Oversizing is the quiet epidemic: an oversized boiler short-cycles, wears faster and runs less efficiently, and modern condensing boilers do their best work running low and long, not blasting and stopping. In the borough’s older, solid-walled stock the calculation genuinely matters in both directions — heat loss can be higher than a modern home’s, while hot-water demand depends on bathrooms and occupants, not floor area. Expect the surveying engineer to count radiators and measure rooms, ask about bathrooms and usage, and explain the kilowatt logic for heating and hot water separately. If a quote arrives without anyone having measured anything, that’s the quote answering a different question.
What a compliant installation includes
Before the boiler goes near the wall: the system cleansed — a thorough flush of the existing radiators and pipework, because new boilers married to old sludge die young and manufacturers know it; a system filter fitted on the return; inhibitor dosed; and in this borough’s water, the scale conversation had — Thames Water confirms the whole region’s water is hard,3 so scale protection appropriate to the system is a specification line, not an upsell.
The installation itself: gas supply checked for correct pipe sizing (undersized gas runs starve modern boilers and fail commissioning), the flue routed and terminated to the rules, condensate run to a proper termination — insulated or internal where possible, because a poorly routed condensate pipe is the classic cold-snap breakdown — and controls brought up to current standards: programmer, room thermostat, TRVs as appropriate.
The paperwork that proves it: commissioning recorded in the Benchmark checklist (the industry’s commissioning record — it lives with the boiler and warranty claims lean on it); the installation notified for Building Regulations, which a Gas Safe registered installer handles through their registration — you should receive the Building Regulations compliance certificate; the manufacturer’s warranty registered, with its term and its annual-service condition stated out loud — that condition is why Boiler Servicing stops being optional the day the warranty starts. Landlords add Regulation 36: a new appliance joins the annual gas-safety-check cycle, with records to tenants4 — see the Landlord Plumbing Compliance Checklist.
Richmond wrinkles
Flues and frontages. A replacement boiler often means a new flue position, and the outside of the building is where the borough has opinions: with 85 conservation areas across Richmond upon Thames,5 a flue terminal landing on a visible frontage in Richmond Hill, Kew, Barnes or the other designated areas deserves the planning question before the core drill — rear elevations and discreet routing usually answer it, but ask first, especially on listed buildings where consent rules are stricter again.
Flats, blocks and who decides. In mansion blocks and leasehold flats, the lease may have views on flue positions, external penetrations and working hours — and some blocks run communal heating, where there’s no individual boiler to replace and the conversation belongs with the managing agent or freeholder. Confirm which world you’re in before getting quotes.
Renting and RHP. A landlord’s boiler replacement carries the Regulation 36 duties above; tenants don’t commission boiler installations in someone else’s property. RHP tenants: Richmond’s former council housing is managed by RHP since the 2000 transfer6 — heating and hot-water provision in an RHP home is theirs to maintain and replace; report failures on 0800 032 2433, noting RHP treats no hot water as an emergency during winter months and total loss of heating between September and April below 10°C, with emergency lines open 24/7.7
What boiler installation costs in Richmond upon Thames
Each listed engineer sets their own prices and quotes directly — these figures are an editorial guide to the local range, nothing more.
| Job | Typical editorial estimate |
|---|---|
| Like-for-like combi swap (same position) | £1,800–£3,000 |
| Combi swap with relocation or flue rework | £2,500–£3,800 |
| System boiler + unvented cylinder | £3,000–£5,000+ |
| Conversion (e.g. heat-only to combi) | £3,000–£4,500+ |
| System flush, filter, controls | often itemised within the above |
Editorial estimates only — not regulated rates, not market data. Compare quotes on contents, not totals: flush, filter, controls, flue work, warranty term and the make/model all belong in writing. A cheaper quote missing the flush is a dearer quote with a delay. Our How to Read a Plumbing Quote guide shows the anatomy; the London Plumbing Costs & Compliance Guide has the wider picture.
Frequently asked questions
A straightforward like-for-like swap is typically a day; add flue rework, relocation or a cylinder and it becomes two or more; a full system conversion can run several days.
The honest schedule comes from the survey — and a proper survey, with rooms measured, radiators counted and the gas run checked, is itself the best predictor of an installer who’ll run to plan.
Count bathrooms and simultaneous showers.
One bathroom, limited space: the combi usually wins — mains-pressure hot water, no cylinder.
Two-plus bathrooms used at once: stored hot water from a system boiler and cylinder keeps everyone happy.
The borough has plenty of both households, which is why the survey matters more than the trend.
Full framework: Combi vs System Boiler guide.
Usually not — but this borough earns the check.
With 85 conservation areas,5 a flue terminal on a visible frontage in a designated area deserves a planning question before drilling, and listed buildings are stricter again.
Rear elevations and discreet routing usually resolve it; your installer should raise it unprompted if the address is in a conservation area.
Four things: the completed Benchmark commissioning checklist, the Building Regulations compliance certificate, the registered manufacturer’s warranty with its term and annual-service condition in writing, and the installer’s invoice naming make, model and work done.
The Building Regulations compliance certificate is notified through the installer’s Gas Safe registration.
Missing paperwork is missing value — it’s what warranty claims and future buyers ask for.
Gas Safe Register — Building Regulations Compliance Certificate
The opposite: it’s the line protecting the boiler.
New boilers connected to sludged systems clog their compact heat exchangers early, and manufacturers expect cleansing, a filter and inhibitor — skipping them risks both performance and warranty arguments.
In this borough’s hard water,3 scale protection joins the same conversation.
A quote without the flush isn’t cheaper; it’s incomplete.
Often yes — kitchens, utility rooms, garages and lofts are all candidates, traded against pipe runs, flue routes and condensate falls.
Relocation adds cost and sometimes planning sensitivity, because the flue has to come out somewhere — see the conservation-area question above.
In converted flats, factor access and the lease’s view of external penetrations before falling in love with a new position.
It’s a fair question with an honest answer: it depends on the property, budget and timing — heat pumps reward well-insulated homes and properly sized emitters, and a dying boiler in January rarely waits for a retrofit assessment.
A reasonable middle path many take: replace the boiler now, and have the installer size radiators and design with lower flow temperatures in mind, which serves efficiency today and transition later.
Get the options priced rather than assumed either way.
Why verified Gas Safe engineers
A boiler installation is the most expensive plumbing decision most households make, and its quality is largely invisible on handover day — which is why the checking happens before the listing. Where boiler and gas work is involved, registration is confirmed directly with the Gas Safe Register before listing, alongside the standard checks — legitimate trading and a named contact, evidence of public liability insurance, coverage of Richmond upon Thames’s postcodes — all re-verified annually. Check the ID card on arrival; good engineers expect it. There’s no pay-to-play ranking — any Sponsored slot is labelled “Sponsored” — and no customer middleman fee: enquiries go directly to the engineer. Full verification process →
Related services in Richmond upon Thames
- Boiler Repair in Richmond upon Thames
- Boiler Servicing in Richmond upon Thames
- Central Heating Repair in Richmond upon Thames
- Emergency Plumber in Richmond upon Thames
- Burst Pipes in Richmond upon Thames
- Leak Detection in Richmond upon Thames
- Blocked Drains in Richmond upon Thames
- Toilet Repairs in Richmond upon Thames
- Tap Repair in Richmond upon Thames
- General Plumbing in Richmond upon Thames
- Bathroom Plumbing in Richmond upon Thames
- Kitchen Plumbing in Richmond upon Thames
- Washing Machine & Dishwasher Installation in Richmond upon Thames
- Commercial Plumbing in Richmond upon Thames
Related guides
- Combi vs System Boiler — UK Guide
- Repair or Replace Your Boiler? — London 2026
- Boiler Fault Codes — London Guide 2026
- London Hard Water — The Complete Homeowner & Landlord Guide 2026
- London Landlord Plumbing Compliance Checklist 2026
A boiler installation in Richmond is three decisions wearing one invoice: the right type for the property’s bathrooms and space, the right size from an actual heat-loss survey, and an installation that flushes, protects against this borough’s scale, and leaves the Benchmark, Building Regulations certificate and registered warranty behind it. The verified Gas Safe engineers above are listed to do exactly that.
Contact verified Gas Safe engineers in Richmond upon Thames ↑
← Back to all plumbing services in Richmond upon Thames
Last reviewed: May 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 regulations and bodies cited on this page — including the Gas Safe Register, the Gas Safety (Installation and Use) Regulations 1998, the National Gas Emergency Service, Thames Water, Richmond Council and Richmond Housing Partnership. Source links are provided within this page where relevant.
Sources & further reading
- National Gas — Emergency contacts (gas emergency: 0800 111 999, free, 24/7)
- Gas Safe Register (the official register; gas installation is legally restricted to registered engineers)
- Thames Water — Hard water (all water in the region is hard)
- Gas Safety (Installation and Use) Regulations 1998 — Regulation 36 (landlords’ duties: maintenance and annual checks of relevant gas fittings and flues, with records)
- Richmond Council — About conservation areas (85 conservation areas)
- Richmond Council — Ten years of the Tenants’ Champion (2000 stock transfer to Richmond Housing Partnership)
- Richmond Housing Partnership — Repairs (emergency repairs include no hot water during winter months, and total loss of heating September–April below 10°C; emergency line 0800 032 2433, open 24/7)