ECO4 Closes 31 December 2026 · Warm Homes Plan from 2027 | 7,000+ Installations
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💰Earn £100 Per ReferralBy Peter Davies, ECO4 Analyst
Reviewed
Yes — if you live in SA1–SA8 and either claim a qualifying benefit (Universal Credit, Pension Credit, PIP, ESA, Income Support, Working Tax Credit or Child Tax Credit) with an EPC of band D–G, or you sit within Swansea Council's Welsh LA Flex routes (free-school-meals receipt, an LA low-income scheme, a Citizens Advice / energy-supplier referral, or a cold-home vulnerability indicator), you can apply for a 100% free ECO4 boiler replacement. Swansea is on the Wales & West Utilities gas network and the parallel Welsh Government Nest scheme is also worth checking.
Pillar guides: Free boiler upgrade · ECO4 eligibility · LA Flex grants
SA1–SA8
Postcode coverage
Wales & West Utilities
Gas Distribution Network
LA Flex active
Swansea Council
£0
Cost to qualifying households
There are two routes for Swansea households. Pick whichever applies — you don't need both.
Per gov.uk's Energy Company Obligation page, you qualify if you receive any of:
No qualifying benefit? Swansea Council runs its own referral route through the LA Flex Statement of Intent.
Bottom line: If your address is in SA1–SA8, you claim a qualifying benefit or fall under Swansea Council's LA Flex criteria, and your EPC is D-G, the eligibility check is a 49-second form.
Swansea's housing splits across three distinct cohorts. The first is the densely-packed Welsh terrace stock that fills Townhill (SA1), Mayhill, Mount Pleasant, Penlan and Brynmill — late-Victorian and Edwardian two-up two-down rows, much of it stone-fronted or rendered, with solid-wall construction. Townhill in particular has seen extensive council renovation to the Welsh Housing Quality Standard, but the privately-owned and privately-rented stock alongside has not. The second is the post-war council estates at Bonymaen, Clase, Penlan and Gendros, where Economy 7 storage heating was common and First-Time Central Heating measures still score strongly. The third is the more affluent stone-villa belt of Sketty (SA2), Killay, Mumbles (SA3) and West Cross — generally higher EPC bands and only marginally relevant to ECO4. For ECO4 the strongest catchment in Swansea is Townhill, Mayhill, Penlan and the inner-city Sandfields-Brynmill terrace belt around the university.
Total dwellings
110,000
as of 2021 Census
Private sector
—
owner-occupied + rented
Social housing
—
registered providers
Bottom line: Swansea's mix of pre-1919 and post-war stock is exactly the catchment ECO4 targets. The mandatory PAS 2035 retrofit assessment will confirm the SAP uplift for your specific address.
Wales & West Utilities is the Gas Distribution Network operator for Wales and the South-West — that includes every SA1–SA8 postcode.
~10 m connection
£500–£800
50 m+ connection
£1,500–£2,500
If your property is already on the gas main — most Swansea addresses are — there is nothing to pay. ECO4 funds the boiler, internal pipework, controls, meter installation, and safe removal of the old system.
Wales & West Utilities's indicative pricing toolBottom line: Almost every Swansea address (SA1–SA8) is already on the Wales & West Utilities gas main, so the connection cost is £0. The rare off-main cases sit on the outer fringes and pay Wales & West Utilities separately for the new connection.
Nest is the Welsh Government's Warm Homes scheme, delivered for Welsh Government by Energy Saving Trust. It funds a package of free home-energy-efficiency improvements (boiler, central heating, insulation) for eligible households. ECO4 and Nest are independent routes — a Swansea applicant should normally check Nest first because it doesn't require the household to have an existing benefit claim, and use ECO4 as the parallel route via Swansea Council's LA Flex.
NestBottom line: Nest runs in parallel with ECO4 — the eligibility tests are independent, so check both before you decide which to apply for first.
You may have seen the successor scheme called "ECO5" online — there is no ECO5. The government has abolished the Energy Company Obligation model and replaced it with the Warm Homes Plan — a £15 billion programme funded by public investment rather than levies on energy bills. ECO4 still runs until 31 December 2026, so Swansea households should apply now while the scheme is open.
Low-income grants
£4.4 bn
Warm Homes Social Housing Fund + Local Grant
Boiler Upgrade Scheme
£7,500
per household, clean-heat grant
Delivery moves from Ofgem to a new Warm Homes Agency, with the Social Housing Fund and Local Grant consolidating into a single low-income capital scheme by 2027/28. Welsh households continue to apply through the Nest scheme, with additional Warm Homes Plan funding allocated to Wales via Barnett Consequentials.
Sources: gov.uk — Warm Homes Plan (updated 18 March 2026); Ofgem response to the Warm Homes Plan.
Bottom line: ECO4 closes 31 December 2026. The Warm Homes Plan replaces it from 2027 — apply now while the current scheme is still open and the £4,000–£8,000 install value is fully funded.
Property
Pre-1919 stone-fronted mid-terrace, two-up two-down, three-bed, solid-wall front and rear
Existing system
EPC band E — 1998 non-condensing combi at end of life, single-zone Y-plan controls, no TRVs
Measure installed
Old combi removed; new A-rated condensing combi sited in the kitchen; full system flush; new programmable controls and TRVs; loft topped up to 270mm. Solid-wall insulation scoped as a phase-2 measure under PAS 2035.
Outcome
EPC modelled uplift from band E to band D; first-winter heating-bill cut of roughly £550–£750. £0 paid by the household.
Time on site
Completed in a single day on site.
Illustrative — based on typical SA1–SA8 installs, not a single named customer.
Bottom line: Typical Swansea installs deliver a two-band EPC uplift in a single intervention at £0 to the qualifying household. Your individual case depends on the PAS 2035 assessment, but the SA1 Townhill pattern above is representative.
Total install value typically £4,000–£8,000.
Most Swansea addresses are already on the gas main — nothing extra to pay.
Bottom line: If your ECO4 application is approved, the install is £0 — typical install value £4,000–£8,000. The only out-of-pocket case is a brand-new gas-main connection from off-grid, which is uncommon in Swansea.
Run our wizard or call +44 7375 868046.
A free home survey by an accredited assessor confirms the right measure for your property.
Gas Safe install, building-control sign-off, lodged on the TrustMark Data Warehouse.
Prefer to contact Swansea Council directly?
Installer chain verified via TrustMark and Ofgem ECO4 Delivery Guidance v4.0.
Bottom line: From the 49-second eligibility check to a commissioned boiler, a typical Swansea ECO4 job runs five to seven weeks. The wizard above is the fastest start — or call +44 7375 868046.
Swansea homeowners (EPC band D–G) and private tenants (EPC band E–G, with landlord consent) whose household either claims a qualifying benefit (Universal Credit, Pension Credit, PIP, ESA, Income Support, Working Tax Credit or Child Tax Credit) or sits within Swansea Council's Welsh-specific LA Flex routes: receipt of free school meals on low-income grounds, support via an LA low-income scheme, a Citizens Advice or energy-supplier referral, or a NICE cold-home vulnerability indicator.
ECO4 and Nest are independent. Nest (Warm Homes Nest, delivered for Welsh Government by Energy Saving Trust) provides a free package of home-energy improvements for eligible Welsh households and doesn't require an existing benefit claim — eligibility is income- and property-based. ECO4 is the UK-wide scheme funded by energy suppliers and delivered by accredited installers with Swansea Council LA Flex referrals where applicable. The pragmatic order in Swansea is usually a parallel check across both — your installer will tell you which route lands the measure faster.
Wales & West Utilities. All SA1–SA8 postcodes sit on the WWU network, the same GDN that covers Cardiff, Newport and Plymouth. ECO4 covers the new boiler, internal pipework, meter installation and removal of the old system at no cost. A new connection from your meter back to the WWU main is separate — WWU publishes its connection-cost pages and a new-connections quote form.
Townhill, Mayhill and Mount Pleasant terraces are typically solid-wall front and rear with stone or render facings. The strongest scoring measure is an A-rated condensing combi replacement plus loft insulation top-up. Internal or external solid-wall insulation is in scope as a phase-2 measure but requires a PAS 2035 fabric assessment and (for external render in conservation pockets) planning consent. The boiler-and-loft package alone typically lifts EPC band E to band D.
Often yes — this is First-Time Central Heating (FTCH), the highest-scoring measure under ECO4 because moving from Economy 7 storage heaters to a gas combi typically jumps the EPC two bands. Most ex-council blocks in Bonymaen, Clase, Gendros and Penlan are connected to the WWU mains even where individual flats are not yet hooked up.
No. Private tenants can apply provided the EPC is band E–G and the landlord consents in writing. Swansea's private rented sector is concentrated around Brynmill, Sandfields and parts of St Thomas, often serving Swansea University students. Welsh Government Minimum Energy Efficiency Standards apply across the rental sector — the upgrade improves the landlord's asset and helps them remain compliant.
ECO4 closes 31 December 2026. After that, the £15 billion Warm Homes Plan takes over from April 2027 — funded by public investment rather than energy-bill levies, and delivered by the new Warm Homes Agency rather than Ofgem (gov.uk Warm Homes Plan, updated 18 March 2026). You may have seen the successor scheme called 'ECO5' online — that name is not used by government and no scheme by that title exists. For Swansea households, the practical effect is straightforward: if you apply under ECO4 before the 31 December 2026 close, the install is funded under ECO4 even if the engineer's visit happens in early 2027; if you start a fresh application after 1 January 2027, you'll be routed through the Warm Homes Local Grant (WHLG), the Warm Homes Social Housing Fund, or the £7,500 Boiler Upgrade Scheme depending on your tenure and property. Your local council's energy team continues to handle the referral throughout the transition.
gov.uk — Energy Company Obligation (ECO4)
Qualifying benefits and EPC band rules
Ofgem — ECO4 Delivery Guidance v4.0 (March 2026)
Scheme closure 31 December 2026, measure rules
gov.uk — Warm Homes Plan
£15bn ECO4 successor scheme, updated 18 March 2026
Swansea Council — Energy Company Obligations (ECO4) page
last updated 2024-01-01
Swansea Council — ECO Flexible Eligibility Statement of Intent
LA Flex thresholds and vulnerability criteria
Wales & West Utilities — new gas connection page
GDN-side connection-cost guidance
ONS Census 2021 — Swansea local-authority area (W06000011)
Dwelling counts for Swansea (2021 Census)
Welsh Government — Energy Performance of Buildings stats
Regional EPC band distribution
Page reviewed: .
49-second form. No commitment. No cost. SA1–SA8 households on Universal Credit, Pension Credit, PIP, ESA, JSA, Income Support, Housing Benefit or Child Benefit — start here. Apply under ECO4 now (closes 31 December 2026); the Warm Homes Plan (sometimes searched as "ECO5") replaces it from April 2027.
