Commercial Solar London — Built for the Capital's Rooftops

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.

The economics come from what each generated unit displaces. DESNZ's Quarterly Energy Prices put the UK average non-domestic electricity price at 24.14p/kWh including the Climate Change Levy in Q1 2026, and daytime-heavy London buildings use most of what they generate on site. Combine that with the Greater London Authority's 2030 net zero target and the London Plan's Policy SI 2, which asks major new development to maximise on-site renewable energy, and the direction of travel is clear.

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.

Coverage: the whole of Greater London, and the edges

This guidance applies 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 corridor just beyond the boundary behaves commercially like London — UKPN's network in many cases, similar access economics. Always check which network operator serves an address: parts of the Thames Valley fringe are served by SSEN rather than UKPN.

A common mistake is to treat each borough as 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 a feasibility should be built per building, not per postcode.

What a good London proposal should contain

A decision-grade London proposal should carry 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 a 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 — ask any installer pricing your project for exactly this. 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.