Solar panels on a garage are one of the most underutilised opportunities in UK domestic solar. Many UK homes have a detached or integral garage with a south-facing roof that’s perfectly positioned for solar, while the main house roof faces north or is too shaded to be productive. Others have garages with flat roofs ideal for a tilted frame installation. Whether you want to power the garage itself, charge an EV from your own generation, or simply add solar generation capacity to your property, a garage installation is often cheaper and simpler than roof panels on the house.
This guide covers everything UK homeowners need to know about putting solar panels on a garage in 2026: planning, grid connection, costs, the EV charging opportunity, and the cases where it makes most sense.
Contents
- 1 Key Takeaways
- 2 Is My Garage Roof Suitable for Solar Panels?
- 3 Planning Permission for Garage Solar Panels
- 4 Connecting Garage Solar to Your Home
- 5 Garage Solar and EV Charging: the Ideal Combination
- 6 Costs: Garage vs House Roof Installation
- 7 Case Study: Hampshire Homeowner, Garage Solar + EV Charger
- 8 Expert Insights From Our Solar Panel Installers About Garage Solar
- 9 Frequently Asked Questions
- 9.1 Do I need planning permission for solar panels on a garage?
- 9.2 Can garage solar panels power my house?
- 9.3 Are solar panels on a flat garage roof effective?
- 9.4 Can I charge my EV from garage solar panels?
- 9.5 What size solar system fits on a single garage roof?
- 9.6 Is garage solar cheaper than house roof solar?
- 9.7 Do garage solar panels qualify for the Smart Export Guarantee?
- 9.8 What if my house roof faces north but my garage faces south?
- 10 Summing Up
Key Takeaways
- Solar panels on a garage roof are permitted under the same permitted development rights as house roof panels, provided the garage is within the property curtilage and standard PD conditions are met.
- A detached garage with a south-facing pitched roof can comfortably accommodate 2–4kWp of panels, generating 1,700–3,400kWh per year.
- Garage solar combined with an EV charger is a particularly compelling combination, letting you charge your car directly from the sun during the day.
- Flat garage roofs are excellent for solar using ballasted (non-penetrating) mounting frames tilted at 15–30 degrees.
- Electricity from a garage installation must be connected to your home’s consumer unit or a sub-distribution board to be used in the house. This requires an MCS-certified installer and DNO notification.
- A garage solar installation costs roughly 10–20% less per kWp than a house roof installation due to simpler scaffolding and access requirements in most cases.
Is My Garage Roof Suitable for Solar Panels?
The same factors that determine house roof suitability apply to a garage: orientation, pitch, shading, condition, and available area. The key difference is that garages are typically lower than the house, which means chimney stacks and trees that would shade the house roof may not shade the garage. And crucially, many UK garages face south because they’ve been built alongside the driveway, which itself often faces the road rather than following the house’s orientation.
A single-car detached garage typically offers 12–20 square metres of roof space. At 1.7m² per standard 400W panel, this accommodates 7–11 panels, giving 2.8–4.4kWp. A standard double garage has 24–35m² and can accommodate 14–20 panels, giving 5.6–8kWp. Both are worthwhile solar systems.
For flat roofs, the available area is effectively the full roof rather than just the south-facing slope, and ballasted mounting frames allow panels to be positioned at the optimal 20–30 degree tilt. This can sometimes mean a flat-roof garage produces more than a pitched garage with a non-ideal orientation.
Planning Permission for Garage Solar Panels
Solar panels on a garage within the property curtilage fall under the same permitted development rights as house roof panels in most cases. The key conditions are: the panels must not protrude more than 200mm from the roof plane when flush-mounted, must not exceed the height of the highest part of the roof, and the installation must not be on a listed building or in a designated area with additional restrictions.
Detached garages that are within the property boundary and not used as a separate dwelling are treated as ancillary structures and benefit from the same PD rights. Conservation areas apply the same restrictions to garage roof panels as to house panels on street-facing elevations, so rear-facing garage slopes typically remain within PD even in conservation areas.
Planning permission is typically required only for listed buildings, scheduled monuments, or where the PD conditions are not met. Contact your local planning authority if you are unsure.
Connecting Garage Solar to Your Home
This is the most important technical point for garage solar: the electricity generated needs to get from the garage to where you use it. For a detached garage, this requires a cable run from the garage’s electrical system to your home’s consumer unit. If the garage already has a mains electrical connection (which most do), extending the circuit to include the solar output via a sub-distribution board is straightforward for a qualified electrician.
If the garage has no existing electrical connection, the installer can install both the solar system and the cable run from the house simultaneously. The cable must be run underground at a minimum depth of 450mm for cables in a duct, or 600mm for directly buried armoured cables. Typical garden cable runs of 5–15 metres add £200–£500 to installation costs.
The solar inverter and consumer unit connection must be handled by an MCS-certified installer. The DNO (Distribution Network Operator) must be notified under G98 regulations for systems up to 3.68kW, or G99 for larger systems. MCS-certified installers handle this automatically as part of the installation process.
Garage Solar and EV Charging: the Ideal Combination
A garage with solar panels and an EV charger is one of the most financially compelling combinations in home energy in 2026. The EV charger consumes electricity at times when the garage panels are generating, and with a smart charger (such as a Zappi or Ohme), the car charges preferentially from solar surplus. On a sunny day, a 3kWp garage system can fully charge a typical EV from empty in 4–6 hours using nothing but free solar electricity.
The financial value of solar EV charging is significant. Charging an average UK EV from the grid costs approximately £2.40 per full charge at 24p/kWh (10kWh for 60 miles of range). Charging from own solar generation costs nothing. A household that drives 10,000 miles per year and charges primarily from their own solar can save £400–£800 per year in EV charging costs alone, on top of the regular household electricity bill savings from the solar system.
Costs: Garage vs House Roof Installation
| System | Garage Cost | House Roof Cost | Annual Generation |
|---|---|---|---|
| 2 kWp (5 panels) | £3,200–£4,200 | £3,500–£4,500 | ~1,700 kWh |
| 3 kWp (7 panels) | £4,500–£5,500 | £5,000–£6,500 | ~2,500 kWh |
| 4 kWp (10 panels) | £5,800–£7,200 | £6,500–8,500 | ~3,400 kWh |
Figures for south-facing pitched roofs, south England, without battery storage. Garage costs are typically 10–15% lower than house roof due to simpler scaffolding requirements. A cable run from detached garage to house adds £200–£500.
Case Study: Hampshire Homeowner, Garage Solar + EV Charger
Background
A homeowner in Winchester had a north-facing house roof that was completely unsuitable for solar, but a detached double garage with a south-east-facing pitched roof and 28m² of usable space. They had recently bought an electric car and were paying around £1,200 per year to charge it at home on a standard tariff.
Project Overview
A 4kWp system (10 panels) was installed on the garage roof, with a cable run to the house consumer unit and a Zappi smart EV charger installed in the garage. Total cost: £9,200 including the cable run, Zappi charger, and OZEV grant (£350 offset). 0% VAT applied to the solar system.
Results
First-year generation: 3,650kWh. The Zappi charger logged 1,800kWh of solar-charged EV electricity, saving approximately £432 in charging costs. Household electricity bills reduced by a further £430 from daytime solar consumption. Total annual benefit: £862 in year one. Projected payback: 10.7 years, well within the panel warranty period. The homeowner noted that in summer months, the car was charging predominantly from the sun with no grid electricity used during daylight hours.
Expert Insights From Our Solar Panel Installers About Garage Solar
“Garage solar is genuinely underrated. We do probably one garage installation for every eight house roof installations, but I’d say garages are suitable for solar in probably one in three homes we visit. The north-facing house, unsuitable main roof scenario is very common in UK streets built before the 1970s, and the garage often faces completely differently. People just don’t think of the garage as an option. If you’ve been told your house roof isn’t suitable, always ask us to look at the garage too,” says one of our senior solar panel installers with over 12 years of UK residential experience.
Frequently Asked Questions
Do I need planning permission for solar panels on a garage?
Not usually. Solar panels on a garage within the property curtilage fall under the same permitted development rights as house roof panels. The panels must not protrude more than 200mm from the roof, must not exceed the roof ridge height, and the installation must meet standard PD conditions. Listed buildings and some conservation area properties may require consent. Check with your local planning authority if uncertain.
Can garage solar panels power my house?
Yes, provided the electricity is connected to your home’s consumer unit via an appropriately sized cable. For detached garages, this requires a buried cable run from the garage to the house, typically at a cost of £200–£500. An MCS-certified installer will design and install both the solar system and the cable connection as part of a single installation.
Are solar panels on a flat garage roof effective?
Yes. Flat garage roofs are well-suited to solar using ballasted (non-penetrating) mounting frames set at 15–30 degrees tilt. The tilt ensures the panels face the sun optimally and are self-cleaning in rain. The full flat roof area is available rather than just one slope, which can mean more panels than a pitched roof. Annual output is typically within 5–10% of an equivalent south-facing pitched roof installation.
Can I charge my EV from garage solar panels?
Yes, and this is one of the most financially rewarding applications for garage solar. A smart EV charger (Zappi, Ohme, or Indra) installed in the garage monitors solar generation and charges the car preferentially from surplus solar electricity. On a sunny day, a 3–4kWp garage system can fully charge a typical EV in 4–6 hours using free solar electricity.
What size solar system fits on a single garage roof?
A standard single garage offers 12–20m² of roof area. At 1.7m² per 400W panel, this accommodates 7–11 panels, giving 2.8–4.4kWp. A double garage can accommodate 14–20 panels (5.6–8kWp). The exact capacity depends on the usable area after allowing for edge clearances and any roof penetrations.
Is garage solar cheaper than house roof solar?
Typically 10–15% cheaper per kWp, because garage roofs are lower and require simpler scaffolding. The saving is partially offset by the cost of a cable run to the house for detached garages (£200–£500). The 0% VAT rate applies equally to garage solar installations, in force until at least March 2027.
Do garage solar panels qualify for the Smart Export Guarantee?
Yes, provided the installation is MCS-certified and connected to the grid via your home’s consumer unit. Your MCS-certified installer will complete the DNO G98 notification as part of installation. You then register with an energy supplier of your choice to receive SEG payments for excess electricity exported to the grid.
What if my house roof faces north but my garage faces south?
This is the ideal scenario for garage solar. A south-facing garage roof can produce 1,100kWh per kWp per year in southern England, matching the output of the best house roof positions. This scenario is common in UK streets where the house faces east–west (gable facing road) but the garage was built perpendicular. Always ask your installer to assess the garage if the main roof is unsuitable.
Summing Up
Solar panels on a garage are a genuinely underutilised opportunity in UK home solar. They fall under the same permitted development rights as house panels, typically cost 10–15% less to install, and can deliver the same financial returns as a house roof system when the garage faces south. The combination of garage solar with an EV charger is one of the most financially rewarding energy upgrades available to UK homeowners in 2026. If your house roof is north-facing, shaded, or structurally unsuitable, the garage is the first alternative to consider. Contact us for a free site assessment covering both your house roof and garage.
Updated