Commercial Solar London — Built for the Capital's Rooftops
Design and installation for London offices, hotels and industrial buildings. UKPN G99 applications, planning checks and logistics handled — fixed-price proposals from your half-hourly meter data.
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Commercial solar in London is a different project
Commercial solar London projects don't behave like the national average, and pretending otherwise is how city installations go wrong. The capital's 8.9 million people and the UK's densest commercial property market mean smaller, more crowded roofs; planning sensitivities that suburban industrial estates never see; UK Power Networks rather than a rural DNO on the other end of the G99 application; and delivery logistics — parking suspensions, crane permits, occupied buildings — that have to be engineered, not improvised.
It also means better economics than most of the country. London businesses pay among the highest commercial electricity rates in Britain — the average mid-size London SME spends around £95,000 a year on energy — so every kilowatt-hour generated on a London roof displaces more expensive grid power than the same panel would in Cumbria. Combine that with the Greater London Authority's 2030 net zero target and the London Plan's Policy SI 2 expectation of PV on major new commercial development, and the direction of travel is unambiguous.
This site covers the whole London-specific picture: how installation works in the capital, planning and roof rights, UKPN connections, what it costs here, and sector-by-sector guidance for offices, hotels and industrial property.
Why the capital's numbers stack up
Where London solar works hardest
Offices. The roof-to-floor-area ratio is poor on tall buildings, but daytime HVAC and IT load matches generation hour for hour, and the EPC uplift matters to landlords facing MEES tightening — proposals point at EPC C by 2027 and B by 2030 for let commercial stock. Office solar in London is usually 30–100kW of high-value generation.
Hotels. Seven-day occupancy, kitchens, laundry and cooling give hotels 85–95% self-consumption — the best conversion of sunlight to saved pounds in the city. London hotel solar typically runs 50–150kW across flat plant-deck roofs.
Logistics and industrial. Park Royal — Europe's largest industrial estate — plus the corridors around Brent Cross, Stratford, the Old Kent Road industrial area and Greenwich Peninsula hold the capital's biggest roofs. Industrial London solar reaches 250–500kW+, where per-kWp pricing is at its best.
Public and third sector buildings have their own funding landscape (the London Energy Efficiency Fund has financed public-building retrofit across the capital), and outer-borough trade parks from Croydon to Watford's fringe behave more like national projects — with London power prices.
From meter data to a commissioned London system
The sequence is built around the two London long-lead items: planning checks and the UKPN application.
- 01Week 1
Desk feasibility
Half-hourly data plus roof drawings give us system size, yield and an indicative price band — and an early read on planning sensitivity and UKPN headroom.
- 02Week 2–4
Planning & roof rights check
Permitted development confirmation or borough pre-app where needed; lease and roof-rights review for tenanted buildings. London’s step that suburban projects skip.
- 03Week 2–12
UKPN G99 application
Submitted as soon as the design stabilises — UKPN response times, not installation, set most London project timelines.
- 04Month 3–6
Install & commission
Logistics plan (access, parking suspensions, crane slots if needed), then 1–4 weeks on the roof, commissioning, witnessing and handover.
The questions London buyers ask first
Three come up in almost every conversation. Will planning be a problem? Usually not — most London commercial roofs still qualify for permitted development — but the exceptions (conservation areas, listed stock, protected views) are concentrated here, which is why the planning check happens before anything is priced. How long will UKPN take? Anything from two weeks to three months depending on system size and local network state; the UKPN guide explains how to keep it off the critical path. What's the premium for working in London? Typically 5–15% over national pricing, driven by access and logistics — itemised honestly on the London costs page.
And underneath all three: is 2026 the right year? Energy prices, tax treatment and tightening EPC rules say yes more loudly than any sales pitch could — the argument is laid out in the case for 2026.
Coverage: the whole of Greater London, and the edges
Projects run across all 32 boroughs and the City — from Park Royal's food and logistics cluster in the west, through the central office and hotel stock between the mainline stations, to Stratford's distribution corridor and the industrial south-east along the Old Kent Road and Greenwich Peninsula. The fringe matters too: Croydon's office and trade-park stock, Bromley and Dartford's industrial edges, and the Watford and Slough corridors just beyond the boundary behave commercially like London — same UKPN network in most cases, same access economics, same elevated power prices — and are covered on the same basis.
What we deliberately do not do is pretend each borough is a different market with different physics. Panel yield in Hounslow matches panel yield in Havering; what changes project to project is the roof, the lease, the feeder and the planning overlay — which is why feasibility is built per building, not per postcode.
What a London proposal contains
Every desk feasibility issued through this site carries the same six elements: a yield model built from your half-hourly data (not a national average); system sizing options against the usable roof; indicative pricing from the current London cost bands; a planning designation screen for the specific address; a UKPN headroom read with the recommended G99 strategy; and a funding comparison across cash, asset finance and PPA. It is the document a finance director can interrogate and a board can approve — and it is free, because projects that start with evidence finish without disputes. The deeper background sits in the guides: installation, costs, planning and grid connections.
Two practical notes for buyers comparing options. First, commercial installations carry standard 20% VAT — the advertised 0% rate is domestic-only until March 2027 — and is recoverable for VAT-registered businesses, so compare quotes ex-VAT as the industry convention assumes. Second, scope completeness decides whether two London quotes are comparable at all: access equipment, highway permits, the G99 application, structural sign-off and export limitation hardware are exactly the lines a low headline price tends to exclude, and exactly the ones that surface later as variations. A fixed price against a written scope, built after the planning and UKPN screens, is the only number worth taking to a board — anything else is an estimate wearing a suit.
Commercial solar in London — quick answers
More detail on every answer lives in the full FAQs and the linked guides.
Is commercial solar worth it in London with smaller roofs?
Yes — because London businesses pay some of the highest commercial electricity rates in the UK, every generated kilowatt-hour is worth more here. A modest 50kW array on a London office or hotel roof typically saves £10,000–£13,000 a year at 2026 city rates. Smaller roofs cap system size, not viability.
Do London commercial buildings need planning permission for solar?
Most rooftop installations proceed under permitted development, but London is the exception capital: conservation areas, listed buildings and sightline policies around protected views require checks that suburban sites never face. We run the planning position for every project as step one — see the London planning guide for the detail.
Who approves the grid connection in London?
UK Power Networks (UKPN) operates the distribution network across London. Any system above 16A per phase needs a G99 application to UKPN before connection. Urban networks are strong, but congested feeders in central London can mean export limitation — usually a minor commercial issue since most London buildings consume nearly everything they generate.
How much does commercial solar cost in London?
Expect £750–£1,200 per kWp installed in 2026 — a modest premium over national rates driven by access logistics, parking suspensions and crane time rather than hardware. A typical 100kW London system lands between £85,000 and £110,000 fully installed. The costs page breaks down every line.
What is the GLA doing about commercial solar?
The Greater London Authority has a 2030 net zero target for the capital and the London Plan expects new major commercial developments to include PV under Policy SI 2. The London Environment Strategy backs building decarbonisation, and public-sector retrofit finance has flowed through schemes such as the London Energy Efficiency Fund. For private occupiers the practical driver is simpler: London power prices.