solar panels for housing associations in London

Guidance for social landlords in London and the wider Greater London area, including Croydon, Bromley, Dartford.

Solar for London’s social landlords, the largest retrofit task in the country

London holds the single biggest concentration of social housing in the UK. Across the 32 boroughs and the City, more than 800,000 social-rented homes are managed by councils, ALMOs, and large housing associations, and these landlords are working towards the government’s confirmed 2030 EPC C target: social rented homes in England are to reach EPC band C or higher on reformed EPCs, against any one metric, by 1 April 2030. Rooftop solar PV is one of the cheapest measures that moves a home from EPC D to C, cuts a tenant’s electricity bill, and earns Smart Export Guarantee income that can be recycled into the wider programme. For a city where many inner-borough households face fuel-poverty pressure, that combination matters.

The Greater London Authority has committed London to net zero by 2030, two decades ahead of the national 2050 target, and the London Environment Strategy makes domestic retrofit central to hitting it. The London Plan (Policy SI 2) expects on-site renewables across new major development, and the Mayor’s Warmer Homes and retrofit programmes have channelled funding into council and housing-association stock for years. For asset managers and decarbonisation leads across the capital, that means strong policy backing, a deep retrofit supply chain, and a regulator and Mayor both pushing hard on tenant warmth.

Where London’s social-housing solar opportunity sits

London’s social stock is unusually varied, and the right solar approach changes by archetype. The interwar cottage estates such as Becontree in Barking and Dagenham, one of the largest council estates in Europe, are mostly pitched-roof houses and low-rise blocks ideal for dwelling-level PV delivered street by street. Postwar and 1960s-70s estates such as the Aylesbury in Southwark, Thamesmead in Bexley and Greenwich, and South Kilburn in Brent mix walk-up blocks with mid and high-rise towers, where the communal landlord supply (lifts, lighting, pumps, corridor heating) is the easiest, highest self-consumption win.

The geography is a delivery factor in its own right. A programme spanning inner boroughs like Hackney, Islington, Lambeth, and Southwark involves dense, often listed or conservation-area stock with tight access and scaffolding constraints. Outer boroughs such as Croydon, Bromley, Barking and Dagenham, and Hillingdon carry more pitched-roof houses where access is simpler and batch delivery faster. The usual approach is to survey representative archetypes across a landlord’s portfolio first, then standardise the design per house type so that a programme covering thousands of homes stays deliverable inside the 2030 window.

What the GLA’s net zero target means for your programme

The Greater London Authority’s 2030 net zero ambition is backed by the London Environment Strategy and a series of retrofit funding streams. Three things matter for a social landlord planning solar in the capital. First, the London Plan supports rooftop solar across residential development, and for existing stock most domestic rooftop PV is permitted development under Class A of Part 14 of the GPDO 2015, which covers houses and blocks of flats within size limits. Listed buildings are excluded, and in a conservation area (the capital’s many conservation areas) solar is not permitted development on a wall facing a highway, a flat-roof array needs the council’s prior approval, and a local Article 4 direction can remove the right.

Second, the GLA and the boroughs have a track record of channelling national money, the Warm Homes: Social Housing Fund and its predecessor the Social Housing Decarbonisation Fund, into London stock. The Wave 3 application window closed on 25 November 2024 and the list of successful landlords was published on 11 March 2025; delivery runs to September 2028 and all grant must be spent by 31 March 2028. Programmes funded this way depend on archetype modelling and careful sequencing of grant spend, built on PAS 2035. Third, the Building Safety Act 2022 regime applies to any roof works on London’s large stock of higher-risk buildings (18m or seven storeys and above), of which the capital has more than anywhere else in the country, so a structural survey and a fire-safety design (BS 9991 is the standard to check against) should be expected for every block array.

What London tenants and landlords actually save

A typical London social home takes a 1.5 to 4 kW system (4 to 10 panels) costing roughly £3,500 to £7,500 fully installed, with cost-per-home falling once it is delivered in street-by-street batches across a borough. Sized for tenant self-consumption, that system lets a resident use the generation directly, and the saving depends on how much of it the household uses, a meaningful figure for households already under fuel-poverty pressure. The benefit model is the decision that matters most: size dwelling systems so the tenant uses the generation directly and pockets the saving, while the landlord (or a split-benefit tariff partner such as Octopus Tenant Power) registers the array for the Smart Export Guarantee and takes only the surplus export. Tariffs vary by supplier; the better fixed rates open to anyone are around 12 to 13p per kWh (October 2026, indicative).

Communal arrays on blocks and sheltered schemes are priced per block (£10,000 to £135,000) and use a larger share of their generation on site because the landlord daytime load runs continuously. London’s distribution networks (UK Power Networks across most of the capital) handle G98 notification for installs up to 3.68 kW per phase, while communal and larger arrays need a G99 application that can run six to eighteen months on constrained inner-London networks, so those are best lodged early. For new build, designed-in PV costs far less than retrofit, and current funding for new-build social homes in London comes through the Greater London Authority under the Social and Affordable Homes Programme 2026 to 2036 (£39bn over ten years; Homes England covers the rest of England).

An illustrative example: a new-build regeneration block in Brent

Illustrative example (not a client project): consider a 60-unit regeneration block of affordable and social-rent flats in a scheme such as South Kilburn in Brent, developed by a registered provider under the Social and Affordable Homes Programme and assumed to be built to the Future Homes Standard with air-source heat pumps and a fabric-first envelope. If solar were designed in at RIBA Stage 3 rather than retrofitted, a 150 kW rooftop array could serve the communal landlord supply and offset the heat pumps’ running cost.

In this illustration, self-consumption would be high because the communal and heat-pump load runs through the day. Designed-in PV generally costs less than an equivalent retrofit, and combining it with heat pumps is aimed at producing low-running-cost social homes from handover. The pattern for regeneration across the capital is to get solar onto the drawings early and pair it with electrified heat, so the resident feels the benefit from the first bill.

Working across London and the home counties

Many London social landlords manage stock that spills beyond the GLA boundary, and often run multi-site programmes across the wider South East. Programmes commonly span all eight London postcode areas and into the neighbouring authorities, including Croydon and Bromley to the south, Dartford across the Kent border, Watford to the north west, and Slough to the west. Each carries its own council climate strategy and its own tranche of council and housing-association stock facing the same 2030 EPC C target.

Nearer cities such as Reading, Luton, and Brighton round out the wider South East picture, and landlords with stock in London often hold homes across those markets too. A programme works best with a consistent PAS 2035 process, archetype design, and tenant-benefit modelling across borough and county lines, so a landlord with stock in three authorities follows one approach rather than three.

To see how the numbers work for your portfolio, start with our social-housing cost breakdown, check the live funding picture on the grants and funding page, and when you are ready, send an enquiry about your London stock and we reply by email.