Can I put solar panels on a detached garage?

Yes. A detached garage typically fits 4–8 panels (1.5–3kW). Electricity is fed to the house via underground cable. Permitted development usually applies (no planning needed). Cost: £1,500–£4,000.

Do garage solar panels connect to my house system?

Yes — either as an additional string on your existing inverter (if capacity allows) or via separate micro-inverters. A buried armoured cable runs from the garage to your house consumer unit.

Is it worth putting solar on a garage?

Yes — if your house roof is full or unsuitable, or if the garage faces a better direction. Each additional panel costs £200–£350 and generates £50–£100/year. Particularly worthwhile combined with an EV charger in the garage.

Do I need planning permission for solar on a garage?

Usually no — standard permitted development applies to detached outbuildings. Panels must not protrude >200mm or extend above the roofline. Conservation areas and listed properties may have additional restrictions.

Solar Panels on a Garage Roof

Last updated: 18 March 2026

Independently written

UK home with detached garage — additional roof space for solar panels — A detached garage adds extra roof space for solar — often at a different (better) orientation.

Can I put solar panels on my garage?

A detached garage roof can add 1.5–3kW of solar (4–8 panels) to your home system at a cost of £1,500–£4,000. The electricity feeds into your home's system via a buried cable. Garage solar makes sense when: your main roof is full, the garage faces a better direction (south), or you want to charge an EV in the garage. Planning permission is usually not needed. The panels connect to your existing inverter (if capacity allows) or a separate small inverter.

Garage Solar: When It Makes Sense

Your main roof is full — you have already installed panels on the house and want more capacity
The garage faces south — if your house faces east/west but the garage faces south, the garage is the better location
You want to charge an EV — panels on the garage + a charger in the garage = short cable run and simple wiring
Your house roof is unsuitable — north-facing, heavily shaded, or structural issues, but the garage is fine
You want a ground-level alternative — garage panels are lower and easier to access for maintenance than house panels
Your garage has a flat roof — flat garage roofs can have panels at any angle using tilted frames

Adding garage panels increases total system capacity — A garage addition extends your system by 1.5-3kW — boosting total generation and savings.

Costs and Installation

Typical garage solar costs:

| Component | Cost | |-----------|------| | 4–8 panels (1.5–3kW) | £800–£2,500 | | Mounting system | £200–£400 | | Underground cable (house to garage) | £200–£600 | | Connection to existing inverter | £200–£400 | | OR separate micro-inverters | £400–£1,000 | | Labour | £400–£800 | | Total | £1,500–£4,000 |

Cable routing: DC or AC cable runs underground in armoured ducting from the garage to the house. Trench depth: 450–600mm. Typical distance: 5–15m. The cable connects to your existing inverter (if it has capacity) or to separate micro-inverters mounted on the garage.

Inverter options: - If your house inverter has spare capacity: connect garage panels as an additional string (cheapest) - If your house inverter is at capacity: install micro-inverters on the garage panels (each panel converts independently) - If the garage is standalone (off-grid workshop): install a small separate inverter + battery in the garage

Source: MCS installer pricing for garage extensions.

Garage solar extension delivers strong ROI — At £1,500-£4,000, garage panels are one of the most cost-effective solar additions.

Planning Permission for Garage Solar

Detached garage in your garden: - Panels on the garage roof are usually permitted development (same rules as the main house) - Must not protrude more than 200mm from the roof surface - Must not extend above the highest part of the roof - No highway-facing restrictions apply to outbuildings in most cases

Garage in a conservation area: - Same conservation area rules apply as for the main house - Panels not visible from the highway are usually fine

Shared garage / garage block: - If the garage is part of a block with shared ownership, you need the freeholder's consent - If it is your freehold garage, standard permitted development applies

Source: Planning Portal outbuilding guidance.

Outbuilding with solar — same planning rules as the main property — Garage solar follows the same permitted development rules as house solar — no planning needed in most cases.

Garage Solar + EV Charging

The ideal garage solar setup for EV owners:

1. Panels on garage roof (4–8 panels, 1.5–3kW) 2. Zappi or smart charger mounted in the garage 3. Direct connection — short cable run from panels to charger 4. Surplus solar → EV automatically during the day

Benefits: - Minimal cable routing (panels directly above charger) - EV charges from surplus solar while parked in garage - No need to run cables from house to garage for the charger - Garage inverter/charger can operate semi-independently from house system

Estimated annual savings from garage solar EV charging: - 2kW garage system surplus for EV: ~1,000 kWh/year free charging - At 24.5p/kWh avoided: £245/year saved on EV charging - System cost: ~£2,500 - Payback: ~10 years from EV charging alone (faster if home electricity savings included)

Source: EV charging calculations; Zappi installation guidance.

Garage solar panels powering EV charger — ideal short-distance setup — Garage panels + EV charger = the shortest cable run and simplest solar EV charging setup.

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