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 SO14–SO19 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 your gross household income is under £31,000 via Southampton City Council's November 2023 LA Flex Statement of Intent V2.0, you can apply for a 100% free ECO4 boiler replacement. Southampton is on the SGN Southern gas network — the same GDN that serves Portsmouth, Brighton, Reading and Oxford.
Pillar guides: Free boiler upgrade · ECO4 eligibility · LA Flex grants
SO14–SO19
Postcode coverage
SGN
Gas Distribution Network
LA Flex active
Southampton City Council
£0
Cost to qualifying households
There are two routes for Southampton 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? Southampton City Council runs its own referral route through the LA Flex Statement of Intent.
Bottom line: If your address is in SO14–SO19, you claim a qualifying benefit or fall under Southampton City Council's LA Flex criteria, and your EPC is D-G, the eligibility check is a 49-second form.
Southampton's housing is a layered patchwork of dock-and-railway terrace stock, post-Blitz council estates and modern waterfront flats. The Victorian terrace cohort runs through Bevois Valley (SO14), Portswood (SO17), Freemantle (SO15), Shirley (SO15) and the streets immediately around St Mary's (SO14) — typically solid-brick dock-worker and railway-employee terraces, often built without a damp-proof course on the river-proximity clay, with penetrating damp from absent or failed DPCs as a regular finding. The inter-war picture adds bay-fronted semis across Shirley, Bassett (SO16) and parts of Sholing (SO19). The post-war picture adds large system-built council estates from the 1950s and 1960s — Weston (SO19), Thornhill (SO19), Townhill Park (SO18), Lordshill (SO16) — typically Reema, Wates, Wimpey No-Fines or BISF non-traditional construction with cavity walls and original electric or gas systems. Modern Ocean Village and Centenary Quay regenerate the docks fringe with high-fabric-standard flats outside ECO4 scope. Note: Northam (SO14), St Mary's (SO14) and Chapel are tidal-flood-exposed, which affects survey logistics for ground-floor measures.
Total dwellings
110,000
as of 2021 Census
Private sector
—
owner-occupied + rented
Social housing
—
registered providers
Bottom line: Southampton'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.
SGN is the Gas Distribution Network operator for Scotland and Southern England — that includes every SO14–SO19 postcode.
~10 m connection
£500–£800
50 m+ connection
£1,500–£2,500
If your property is already on the gas main — most Southampton addresses are — there is nothing to pay. ECO4 funds the boiler, internal pipework, controls, meter installation, and safe removal of the old system.
SGN's indicative pricing toolBottom line: Almost every Southampton address (SO14–SO19) is already on the SGN gas main, so the connection cost is £0. The rare off-main cases sit on the outer fringes and pay SGN separately for the new connection.
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 Southampton 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.
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 Victorian mid-terrace, three-bed dock-worker housing, solid-brick front and rear, no original damp-proof course
Existing system
EPC band E — 1998 non-condensing combi at end of life, gravity-fed copper pipework, no TRVs, original sash to the front, persistent rising damp on the front and rear elevations
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. Damp-proof injection flagged for a separate non-ECO4 visit because Victorian DPC remediation is not within scope.
Outcome
EPC modelled uplift from band E to band D; first-winter heating-bill cut of roughly £500–£700. £0 paid by the household.
Time on site
Completed in a single day on site.
Illustrative — based on typical SO14–SO19 installs, not a single named customer.
Bottom line: Typical Southampton 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 SO14 Bevois Valley pattern above is representative.
Total install value typically £4,000–£8,000.
Most Southampton 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 Southampton.
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.
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 Southampton ECO4 job runs five to seven weeks. The wizard above is the fastest start — or call +44 7375 868046.
Southampton 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 has gross income under £31,000 via Southampton City Council's LA Flex referral. A cold-sensitive health condition can substitute for the income test.
Yes. Southampton City Council publishes its ECO4 and GBIS Flexible Eligibility Statement of Intent at V2.0 (29 November 2023), covering both ECO4 Flex and the Great British Insulation Scheme. The standard £31,000 gross income threshold is supplemented by cold-home vulnerability indicators across the four Ofgem Route 2 proxies.
SGN Southern — Southampton sits in SGN's Southern England network, the same GDN that covers Portsmouth, Brighton, Reading and Oxford. ECO4 covers the new boiler, internal pipework, meter installation and removal of the old system at no cost. The connection from your meter back to the SGN main is separate — for a standard sub-20-metre run the SGN service charge is around £893 plus VAT.
Southampton's dock-worker terrace belt — Bevois Valley, Portswood, Freemantle and the inner Shirley streets — was largely built before damp-proof courses became standard, often on river-proximity clay. The strongest scoring ECO4 package is an A-rated condensing combi replacement plus loft top-up to 270mm. Damp-proof injection is not ECO4-funded — it's a separate non-ECO visit because Victorian DPC remediation falls outside the scheme's measure list.
Often yes, with extra survey steps. Southampton's large post-war estates at Weston, Thornhill, Townhill Park and Lordshill use non-traditional construction types (Reema, Wates, Wimpey No-Fines, BISF steel-frame). A PAS 2035 retrofit assessment is required before fabric measures can be scoped, but boiler-replacement and First-Time Central Heating are routine and score heavily because of the SAP uplift from moving off Economy 7 storage heaters.
Northam (SO14), St Mary's (SO14) and Chapel are within the tidal-flood-exposure zone, which affects survey logistics for ground-floor measures and boiler siting — for example, the surveyor may require the boiler to be sited above ground-floor flood level. The ECO4 eligibility rules themselves don't change; the practical install plan does. PAS 2035 assessment captures the flood-risk constraint as part of the property survey.
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 Southampton 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
Southampton City Council — Energy Company Obligations (ECO4) page
last updated 2023-11-29
Southampton City Council — ECO Flexible Eligibility Statement of Intent
LA Flex thresholds and vulnerability criteria
SGN — new gas connection page
GDN-side connection-cost guidance
ONS Census 2021 — Southampton local-authority area (E06000045)
Dwelling counts for Southampton (2021 Census)
Southampton City Council — Housing Strategy evidence
Regional EPC band distribution
Page reviewed: .
49-second form. No commitment. No cost. SO14–SO19 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.
