A new boiler install is one of the biggest plumbing purchases a household makes — from a like-for-like combi swap in a Purley semi to a full system conversion in an East Croydon 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.
Engineers listed here for gas boiler work are Gas Safe registered and cover Croydon CR postcodes. Gas Safe registered businesses can self-certify the installation under Building Regulations and handle notification to the local authority — you receive a Building Regulations Compliance Certificate in the post.³
✅ Gas Safe registration checked against the Gas Safe Register where applicable ✅ Insurance and business identity and contact details verified
✅ Verified by our 16-point process (see how we verify plumbers →)
✅ Covering CR0, CR2, CR5, CR7, CR8, SE25 & SW16
What kind of install am I pricing?
- 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 England⁵
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Every listing is verified at time of listing — Gas Safe registration checked against the Gas Safe Register where applicable, evidence of public liability insurance checked, business identity and named contact validated. No paid placements go live without verification — listing comes after checks, not before.
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 (or confirm it’s charged separately)
- 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)
Get it in writing. No call centres, no middlemen — you contact the engineer directly, explain your current boiler and property layout, and the engineer may arrange a survey (or ask for photos) before issuing a written quote. You compare quotes and choose 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 work categories they are qualified to carry out.
Gas Safe registration and Building Regulations — the legal requirements
Any gas work on a new boiler installation must be carried out by a Gas Safe registered engineer. This is a legal requirement under the Gas Safety (Installation and Use) Regulations 1998¹ and is confirmed by the HSE’s domestic gas guidance.²
New boiler installations must also be notified under the Building Regulations.
Under the Building Regulations, installations of heat-producing appliances such as boilers must be notified to the local authority. Gas Safe Register confirms that Gas Safe registered businesses can self-certify and notify this work on your behalf, typically within 30 days of installation³ — you then receive a Building Regulations Compliance Certificate in the post, typically within 10–15 working days of notification.
Keep the Building Regulations Compliance Certificate — it belongs to the property and is often requested when you sell your home.
Before work begins, verify the engineer’s registration and work categories at gassaferegister.co.uk.⁴ Check the back of the ID card for the specific gas categories they are qualified for.
Boiler Plus — what the law requires for new combi installations in England
The core requirements:
- All new and replacement gas boilers must meet a minimum 92% ErP efficiency.⁵
- Time and temperature controls (typically a programmer and room thermostat) must be installed with all new gas and oil systems.⁵
- 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.⁵
Boiler Plus applies across England, including all Croydon postcodes. Installations must comply with these Building Regulations requirements.⁵
Ask your engineer which measure they’re specifying for your combi install and why — the answer will reflect your property type, existing controls and household use patterns.
What to expect from a new boiler installation in Croydon
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.
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.
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 Croydon postcodes
Croydon sits in Thames Water’s hard water area. Thames Water confirms hard water can lead to limescale build-up on household appliances and fittings⁶ — which can affect the long-term performance of heating system components.
Some boiler manufacturers may require or recommend a scale inhibitor and/or system cleaner 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.
Council tenants in Croydon — boiler replacements
If you live in a Croydon Council home with a council-owned boiler, do not arrange a private replacement. Boiler replacements are handled through the council’s planned maintenance programme.
To report a boiler that needs replacing or to ask about planned works, call 020 8726 6101.
Private tenants and landlords in Croydon — landlord responsibility
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 Croydon Council confirms tenants must receive a copy of the Gas Safety Certificate before moving in, or within 28 days of the check being completed.⁸
If you are a private tenant and your landlord is replacing a boiler, you can ask to see the Building Regulations Compliance Certificate for the new install — the certificate belongs to the property.
If a landlord fails to carry out needed repairs, Croydon Council advises private tenants to contact their landlord or agent and confirm the request in writing.⁹ If your landlord does not respond, Croydon Council’s Private Sector Housing Team can intervene on 020 8760 5476.⁹
What a new boiler installation costs in Croydon
Indicative market observations only, 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, filter/inhibitor, 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 time of listing — the checks below are completed before the profile goes live.
What we check before an engineer is listed in Croydon:
- 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 Croydon CR 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 Croydon
Yes. Any gas work on a new boiler installation requires a Gas Safe registered engineer — it is a legal requirement under the Gas Safety (Installation and Use) Regulations 1998.¹
The installation must also be notified under the Building Regulations, which a Gas Safe registered business does on your behalf — typically within 30 days.³ Verify registration and work categories at gassaferegister.co.uk⁴ before work begins.
Yes — Boiler Plus applies across England, including all Croydon postcodes.
New and replacement gas boilers must meet a minimum 92% ErP efficiency, 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.⁵
Boiler replacements for council-owned boilers are handled through Croydon Council’s planned maintenance programme, not by private arrangement.⁷
Call 020 8726 6101 to report a boiler that needs replacing or to ask whether your property is scheduled for works.
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 Gas Safety Certificate (also called a Landlord Gas Safety Record, 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.⁸
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, and the certificate arrives in the post within 10–15 working days of notification.³ It belongs to the property — keep it safe, as it’s often requested when you sell.
Boiler Installation across Croydon — areas we cover
- Boiler Installation Croydon town centre
- Boiler Installation Addiscombe
- Boiler Installation Thornton Heath
- Boiler Installation South Norwood
- Boiler Installation Norbury
- Boiler Installation Purley
- Boiler Installation Coulsdon
- Boiler Installation Sanderstead
- Boiler Installation Shirley
- Boiler Installation Selhurst
Related services
- Boiler Repair Croydon
- Boiler Servicing Croydon
- Central Heating Repair Croydon
- Emergency Plumber Croydon
- General Plumbing Croydon
Related guides
- Should I Repair or Replace My Boiler?
- London Plumbing Costs Guide
- London Hard Water Guide
- How to Read a Plumbing Quote
From a combi swap in a Thornton Heath Victorian terrace to a full system conversion in a Purley 1930s semi or a Boiler Plus–compliant install in an East Croydon flat — every engineer listed here is verified at time of listing, Gas Safe registered for gas work, and covering Croydon postcodes.
Get a Verified Boiler Installation Engineer in Croydon Now →
Sources & further reading
¹ Legislation.gov.uk — Gas Safety (Installation and Use) Regulations 1998 https://www.legislation.gov.uk/uksi/1998/2451 ² HSE — Domestic gas: frequently asked questions https://www.hse.gov.uk/gas/domestic/faqs.htm ³ Gas Safe Register — Building Regulations certificates https://www.gassaferegister.co.uk/gas-safety/gas-safety-certificates-records/building-regulations-certificate/ ⁴ Gas Safe Register — Find an engineer https://www.gassaferegister.co.uk/find-an-engineer/ ⁵ GOV.UK (BEIS) — Boiler Plus: New standards for domestic boiler installations from April 2018 https://assets.publishing.service.gov.uk/media/5b2cc1e2ed915d586e2d8fe9/Boiler_Plus_Factsheet_v3.pdf ⁶ Thames Water — Hard water https://www.thameswater.co.uk/help/water-and-waste-help/water-quality/hard-water ⁷ Croydon Council — Annual gas service https://www.croydon.gov.uk/housing/information-council-tenants/housing-maintenance-and-safety/repairs-council-homes-0/annual-gas-service ⁸ Croydon Council — Gas safety services https://www.croydon.gov.uk/housing/information-council-tenants/housing-maintenance-and-safety/housing-maintenance-and-safety/home-safety-services ⁹ Croydon Council — How to report disrepair to your landlord https://www.croydon.gov.uk/housing/private-tenants/how-report-disrepair-your-landlord