Solar panels in Bristol: output, export payments and planning

Bristol’s modelled solar output

Bristol models higher than the northern cities in this guide. PVGIS, the European Commission’s solar tool, models about 1,025 kWh a year for each kWp on a south-facing roof at 35 degrees. The PVGIS run for Bristol shows the inputs.

The best tilt is about 39 degrees, which models at 1,027 kWh per kWp. The difference is two units. So a standard pitch is fine.

For example, a 4 kWp system would make about 4 x 1,025, or 4,100 kWh a year. Treat that as a modelled estimate. It assumes a good roof, a 14% system loss and an average year.

Your own roof may differ. Shade from trees or taller buildings can cut output sharply, while a roof that faces away from south will make less.

Ofgem counts 2,500 kWh a year as typical use for a medium home. On paper, a 4 kWp roof could cover more than that. In practice, however, you will use only part of it as it is made.

When east and west roofs make sense

Not every roof faces south. Some homes have a ridge that runs the other way, which leaves east and west slopes. These can still work, although the sums change.

Our post on east-west facing solar panels explains the trade-off. You get less total power than a perfect south roof, but it arrives earlier and later in the day. That suits households with breakfast and evening demand.

A good installer will model both layouts for your roof. Ask to see the numbers side by side. You can still change a design before you sign, so this is the time to ask.

Getting paid for spare power

Panels often make more than you use at midday. The extra can go to the grid. Under the Smart Export Guarantee, a supplier pays you for it.

Our guide to the Smart Export Guarantee covers eligibility and how to compare tariffs. Ofgem says tariff rates must always be above zero. Suppliers choose their own terms, so rates differ.

You must also show that your installation and installer are MCS-certified. You need a meter that gives half-hourly export readings too, which is usually a smart meter. Apply directly to the supplier you choose.

Grid connection

Bristol sits in the South West area of National Grid Electricity Distribution. Any new generator needs reporting to the operator. The route depends on size.

According to the MCS solar standard, systems up to 16 A per phase follow G98. Larger systems follow G99. Because all generators count together, solar plus a battery adds up.

National Grid’s page says a small G98 system is notified within 28 days of commissioning. The installer normally does this. Even so, ask for the confirmation.

Planning in Bristol

Bristol City Council handles planning. Many houses can fit panels without a full application. However, England changed its permitted development rules for solar on 27 August 2026.

The Planning Portal explains the new split between houses and blocks of flats. Prior approval can now apply to stand-alone solar on flats. Projects that no longer qualify can use the older rules until 26 August 2027.

Conservation areas and listed buildings carry extra limits. Ask the council before you commit, since a refusal after installation is costly. Keep its reply.

Tax and timing

There is a date to keep in mind. HMRC says solar panels and batteries are zero-rated for VAT until 31 March 2027. After that, the rate returns to 5% under current legislation. If you plan to buy, build that date into your timetable.

Choosing an installer

Use the MCS installer search to check a firm’s certificate. Then look at the consumer code. RECC members must insure deposits, stage payments and workmanship warranties.

Ask for three written quotes, because a single offer tells you little. Compare the panel count, the warranty and the grid paperwork. Our page on solar panel installation lists what a full job includes. The solar panel costs guide sets out official price data.

Cardiff lies across the Severn and has a different planning system. Our page on solar installers serving Cardiff shows a slightly higher modelled yield and Welsh rules.

When you are ready, you can request quotes from MCS-certified installers. Nobody contacts you until you send the form.