Solar panel installation in London is one of the most effective ways to reduce your electricity bills and lower your carbon footprint in 2026. With 0% VAT on installations in place until March 2027 and the Smart Export Guarantee paying you for surplus energy, the financial case is strong. This guide covers what the solar panel installation process involves, what affects the cost and what to look for in a London installer.

What Does Solar Panel Installation in London Involve?

A solar panel installation in London follows a clear, well-regulated process from first contact to your system going live:

• Site survey: an MCS certified installer visits your property to assess your roof orientation, pitch, shading, available space and electrical setup. This usually takes 1 to 2 hours and is free with Green Electro Heating
• System design and quote: based on the survey, the installer specifies the right system size, panel type, inverter and any battery storage, and provides a written quote
• Installation: the physical installation typically takes 1 to 2 days for a standard domestic system, including scaffolding, panel mounting, inverter installation and electrical connections
• Commissioning and DNO notification: the system is tested and commissioned, and the installer notifies the Distribution Network Operator (DNO). Systems under 3.68kW use a same-day G98 notification, while larger systems require G99 approval which takes 20 to 40 working days
• MCS certification and SEG registration: once commissioned, the installer issues MCS certification and registers the system for the Smart Export Guarantee, allowing you to earn from surplus electricity exported to the grid

From initial contact to the system going live, the full process typically spans 2 to 3 months, though the physical installation itself is just 1 to 2 days.

How Much Does Solar Panel Installation Cost in London?

Based on MCS Dashboard data from early 2026, the average cost of a fully installed domestic solar PV system in the UK is around £1,686 per kW. A typical 4kW system therefore costs in the region of £6,700 to £8,200, while a 4kW system with battery storage typically ranges from around £9,500 to £12,000. London installations can sit at the higher end of these ranges due to labour rates and access considerations.

These figures are general UK market data. For an accurate quote for your specific property, get in touch with our team for a free site survey and written quote with no obligation.

Is Solar Panel Installation in London Covered by VAT Relief?

Yes. Solar panel installations currently attract 0% VAT, saving homeowners 20% compared to the standard rate. This applies to both the panels and the installation and is in place until 31st March 2027. Battery storage installed alongside solar panels also qualifies for 0% VAT within the same window. This makes 2026 a particularly good time to invest in solar if you have been considering it.

Do I Need Planning Permission for Solar Panels in London?

In most cases, solar panel installation falls under permitted development and does not require a planning application. However, there are some situations where additional checks are needed:

• Listed buildings require Listed Building Consent for any external alterations
• Conservation areas may have additional restrictions if the panels are visible from a highway
• Flat roofs have specific requirements around panel positioning relative to the roof edge

Your installer should confirm the planning position for your property as part of the site survey before any work is agreed.