Boiler Installation London — Can You Get a Free Boiler

Can You Get a Free Boiler in London? ECO4 and Borough Grant Schemes Explained

London has approximately 400,000 households in fuel poverty — one of the highest concentrations in England. That makes ECO4, the government's main energy efficiency scheme for lower-income households, particularly relevant for the capital. If you receive qualifying benefits and your home is rated EPC D to G, ECO4 can fund a boiler replacement at no cost. If you do not receive qualifying benefits, your London borough's ECO4 Flex scheme may still provide a route. ECO4 closes 31 December 2026.

Important: InstantGrant is an independent grant information and application-support service. We are not the UK government, Ofgem, Greater London Authority, or any London borough council. We do not install boilers, award grants, or make eligibility decisions. All scheme details on this page are verified against Ofgem guidance, GLA Warmer Homes programme data, and instantgrant.co.uk live data as of 5 September 2026. Always confirm current eligibility with your energy supplier or borough council before proceeding.

London's housing stock — Victorian terraces in Islington, post-war estates in Newham, converted flats in Lambeth — presents specific challenges for energy efficiency. Many properties have solid walls, ageing heating systems, and EPC ratings well below the band C threshold. This is precisely the housing stock that ECO4 is designed to improve. This guide explains every route available to London residents in 2026.

Can You Get a Free Boiler in London Through ECO4?

The short answer is yes — if you qualify. ECO4 can fund a boiler replacement as part of a wider package of energy improvements for eligible London households. The longer answer involves understanding two things: what ECO4 actually funds, and which of the two eligibility routes applies to your household.

The Standard Benefits Route

If you or someone permanently living in your home receives a qualifying means-tested benefit, and your home is rated EPC D to G, you are likely eligible for ECO4 through the standard benefits route. Qualifying benefits include Universal Credit, Pension Credit (both Guarantee and Savings Credit), Housing Benefit, Income Support, income-based JSA, income-related ESA, Child Benefit, Child Tax Credit, and Working Tax Credit.

Contact an ECO-participating energy supplier and ask for an ECO4 survey. You do not need to be a customer of that supplier — funding follows the installer's delivery framework, not your account. British Gas, E.ON Next, EDF, OVO, Octopus Energy, and ScottishPower are among the major suppliers with active ECO4 programmes in London.

The London Borough ECO4 Flex Route

All 33 London boroughs publish their own ECO4 Flex Statements of Intent. These documents set out the conditions under which each borough will refer households for ECO4 even without qualifying benefits. The standard income threshold used by most London boroughs for ECO4 Flex referrals is £31,000 gross household income or below, though this varies by borough.

Most London boroughs do not prominently advertise their ECO4 Flex scheme. Ask your borough council's housing or energy team directly whether they run a Flex referral programme and what their current criteria are.

Several London boroughs are particularly active in ECO4 Flex delivery, including Hackney, Tower Hamlets, and Lewisham — all areas with high concentrations of older housing stock, solid-wall properties, and fuel-poor households. If you live in one of these or a similar inner-London borough with high fuel poverty rates, it is worth contacting the housing team directly even if you do not receive qualifying benefits.

Free Boiler in London: What ECO4 Actually Provides

A free boiler from ECO4 in London is not typically a standalone installation. ECO4 follows a whole-house, fabric-first approach, meaning insulation usually comes alongside any boiler replacement.

For a typical London Victorian terrace with solid walls and an old gas boiler, an ECO4 package might include:

Internal solid wall insulation covering the external-facing walls, loft insulation, and a boiler replacement — a combined package worth £12,000 to £20,000 for a typical two-storey London terrace.

For a post-war mid-terrace or semi-detached with cavity walls, the package is often loft insulation, cavity wall insulation, and a boiler replacement, typically worth £4,000 to £8,000.

For a converted flat, ECO4 is more complex. The measures available depend on whether you are on the top floor (loft insulation may be possible), whether the building's communal areas allow external work, and whether the building owner gives consent. Flat-dwellers in London should contact their energy supplier and ask specifically about ECO4 for flats rather than assuming the standard house-based process applies.

The Mayor of London's Warmer Homes Programme

In addition to ECO4, the Mayor of London has run the Warmer Homes programme, which provides additional support for fuel-poor London households for insulation and heating improvements. The programme has been delivered through borough partnerships and has targeted the capital's worst-performing housing stock.

Contact your borough council's housing team for the current status of the Warmer Homes programme in your area and whether any locally-funded support runs alongside ECO4.

Boiler Installation London: What It Typically Costs Without a Grant

For London residents who do not qualify for ECO4 or the Warm Homes Local Grant, a new boiler installation in London typically costs between £2,500 and £4,500 for a standard combi boiler replacement, based on London 2026 installer pricing. London's higher labour rates push installation costs 15 to 20 percent above the national average for equivalent work.

Three practical steps if you do not qualify for a grant:

Get three quotes from Gas Safe registered engineers. Verify registration at gassaferegister.co.uk. London has a significant number of unregistered traders offering boiler work at low prices — always verify before booking.

Consider 0 percent finance. Most national boiler installation companies, including BOXT, Heatable, and Worcester Bosch Accredited installers, offer 12-month interest-free finance. This spreads the cost without adding to it.

Check whether the Boiler Upgrade Scheme applies. If you want to switch from gas to a heat pump rather than a like-for-like gas replacement, the Boiler Upgrade Scheme gives £7,500 off the installed cost in London with no income test.

ECO4 for London Renters

London has a private rented sector proportion of approximately 27 percent — significantly higher than the national average. This means a large proportion of Londoners who might qualify for ECO4 through benefits or ECO4 Flex are renting rather than owning their home.

Private tenants in London can access ECO4, but their landlord must provide written consent before any work can start. The landlord pays nothing — all work is funded through ECO4 — but their permission is legally required.

For properties rated EPC F or G, some London borough delivery frameworks require a landlord contribution toward costs because MEES regulations already legally require landlords to bring sub-EPC-E properties up to standard. If your landlord refuses to consent to ECO4 work on a property below EPC E, contact your borough council's private sector housing team, who can advise on MEES enforcement options.

Social housing tenants in London — including those in properties managed by Clarion, L&Q, Notting Hill Genesis, and other major London housing associations — may qualify for ECO4 through their social landlord. Contact your housing association directly rather than approaching an energy supplier.

Free Boiler London Scams: What to Watch For

London generates a disproportionate share of energy grant fraud complaints in England, driven by the large population, high housing density, and high concentration of cold-calling activity in inner-London postcodes.

Common patterns in London-specific boiler grant fraud include doorstep visitors claiming to represent a council or housing authority, offering a free boiler survey with no appointment made. Unsolicited calls from companies using local London phone numbers claiming to have identified you as eligible. Social media adverts targeting London postcodes claiming large grant amounts for "government boiler replacements."

Legitimate ECO4 work in London requires a home survey before any measures are agreed. No upfront payment is ever required. All ECO4 installers in London must be TrustMark-registered. Verify any company at trustmark.org.uk before allowing anyone into your home.

Report suspected fraud to Action Fraud at actionfraud.police.uk or by calling 0300 123 2040. The Metropolitan Police's fraud reporting line is also available for London residents.

London Boroughs and ECO4 Flex: Key Points

Each of London's 33 boroughs runs its own ECO4 Flex scheme with individual criteria. While most use an income threshold of around £31,000, some boroughs include additional qualifying factors such as health vulnerability, having children under five in the household, or properties in designated fuel poverty priority areas.

To find your borough's ECO4 Flex criteria, search for your borough name alongside "ECO4 Flex Statement of Intent" — each borough is required to publish this document publicly. Alternatively, call your borough council's housing or energy advice team directly.

Boroughs with the highest fuel poverty rates in London — including Newham, Tower Hamlets, Hackney, Southwark, and Lambeth — typically run the most active ECO4 Flex programmes with the highest volume of referrals. If you live in these areas, the likelihood of ECO4 Flex support being available is higher than in lower-fuel-poverty outer London boroughs.

All London Grant Routes at a Glance

Frequently Asked Questions

Can you get a free boiler in London through ECO4? Yes, if you receive qualifying benefits and your home is rated EPC D to G. ECO4 closes 31 December 2026. All 33 London boroughs also run ECO4 Flex schemes for residents who do not receive qualifying benefits but have low incomes or health vulnerabilities.

What is the ECO4 Flex income threshold in London? Most London boroughs use an income threshold of £31,000 gross household income or below, though criteria vary by borough. Contact your borough council's housing or energy team and ask specifically about their ECO4 Flex Statement of Intent.

Can London renters get a free boiler through ECO4? Yes, with their landlord's written consent. The landlord pays nothing. For properties below EPC E, some London borough delivery programmes require a landlord contribution because of existing MEES legal obligations.

How much does boiler installation cost in London without a grant? Between £2,500 and £4,500 for a standard combi boiler replacement in 2026. London's labour rates are 15 to 20 percent higher than the national average for equivalent work.

What is the Mayor of London's Warmer Homes programme? A GLA programme providing insulation and heating improvements for fuel-poor London households, delivered through borough partnerships. Contact your borough council for current availability and whether any locally-funded support operates alongside ECO4.

Does ECO4 apply to London flats and apartments? Yes, but the process is more complex than for houses. Available measures depend on floor level, building type, and whether the building owner or freeholder gives consent. Contact your energy supplier and ask specifically about ECO4 for flats.

Which London boroughs have the most active ECO4 Flex schemes? Boroughs with the highest fuel poverty rates typically run the most active programmes, including Newham, Tower Hamlets, Hackney, Southwark, and Lambeth. Contact your specific borough to confirm current availability.

How do I report a free boiler scam in London? Report to Action Fraud at actionfraud.police.uk or call 0300 123 2040. You can also report doorstep fraud to the Metropolitan Police. Always verify any ECO4 installer at trustmark.org.uk before allowing access to your home.

How InstantGrant Can Help

Understanding which ECO4 route applies to your specific London property and household — the benefits route, borough Flex, or a combination with the Warm Homes Local Grant or Boiler Upgrade Scheme — takes more than reading a national guide.

InstantGrant is an independent grant information and application-support service. We help London households identify which scheme applies to their situation, which borough to contact for ECO4 Flex support, and how to navigate the process before the December 2026 deadline.

We are not Ofgem, any London borough, the GLA, or any energy supplier. We do not award grants and we do not guarantee any outcome. We help you find the right route with accurate, current information.

Check your eligibility at instantgrant.co.uk