Car Dealership Solar: 2026 Cost & Payback

What solar panels for dealerships actually cost in 2026

Solar panels for dealerships sit in a price band that surprises a lot of dealer principals, because a franchised car dealership is one of the better commercial solar sites on any high street. The reason is simple: a dealership runs almost its entire electrical load in daylight, which is exactly when a rooftop array generates most. A large glazed showroom is lit and climate-controlled through every trading hour, the service workshop and MOT bays run compressors, ramps, diagnostics and extraction all day, and forecourt and signage lighting layer on top. The result is high self-consumption, and self-consumption is the single biggest driver of how quickly a system pays back.

For a typical UK dealership we design a system in the 50 to 400 kW range, which works out at roughly 92 to 740 panels across about 400 to 2,800 square metres of showroom and workshop roof. A project that size usually lands between £45,000 and £350,000, depending on showroom size, workshop footprint and how much solar carport you add over the forecourt. Every figure here is illustrative and depends on your franchise, roof, load profile and tariff, but the band is consistent across the sector.

Where the cost band comes from

Cost is driven by system size, which in turn is driven by your daytime load, not the size of your roof. A single-franchise showroom with a modest aftersales operation might need a 60 to 120 kW system. A large multi-marque site with a busy workshop, a bodyshop and a growing bank of EV chargers can justify 250 to 400 kW or more. The headline numbers break down roughly like this for an illustrative dealership:

Cost per kW

Larger systems cost less per kilowatt because the fixed costs of scaffolding, design, grid application and commissioning are spread across more panels. As a guide, systems above 250 kW tend to fall around £750 to £950 per kW. Smaller showroom-only installs sit a little higher per kW; a forecourt solar carport carries a premium over rooftop because of the steel structure, but it turns dead parking into generation and EV-ready bays, so it often earns its place. We assess the forecourt carport alongside the roof as standard, because it is usually the largest untapped surface a dealership owns.

What is included

A proper dealership quote covers the panels, inverters, mounting, all DC and AC cabling, the structural survey of the showroom and workshop roofs, the G99 grid-connection application, commissioning and handover, and the monitoring platform. Where the work pairs with EV charging, the chargepoints and their grant application are designed in as one project rather than bolted on later. Be wary of any quote that omits the structural survey or the grid application, because those are the two items that most often delay or derail a commercial install.

Typical payback for a dealership

Across the sector, a dealership solar system pays back in roughly 5.5 years on a typical design. After that, the electricity is effectively free for the fifteen to twenty plus years of the system’s working life. Payback is faster where the workshop and showroom load is high and steady through the day, because more of the generation is self-consumed rather than exported at a lower rate.

The reason the payback is competitive comes back to the load profile. A dealership uses most of its power while the sun is up. Add daytime EV charging for demonstrators, staff vehicles and customer handovers, and the demand curve absorbs an even larger share of midday generation at full self-consumption value, which is the most valuable kWh on the system. We size toward 80 to 90% of daytime load for exactly this reason, and we model EV-charging growth into the figures before settling the final design.

What moves the payback up or down

Three things shift the number. First, your current electricity tariff: the more you pay per unit today, the faster solar pays back, because every self-consumed kWh avoids that import cost. Second, how much you export: a dealership self-consumes most of what it makes, so export income through the Smart Export Guarantee is a useful top-up rather than the main event, but it still counts, especially over weekends. Third, the tax treatment, which for a profitable dealership is the single biggest accelerator.

How tax relief speeds up the return

The standout financial lever on dealership solar is the way the tax system treats it. Solar PV falls into the special-rate plant and machinery pool, so the 100% Annual Investment Allowance covers the first one million pounds of qualifying expenditure against profit. For a limited company that means a year-one effective tax saving of up to 25% of the system cost. Most single-site dealership installs sit comfortably within that one million pound cap and are fully expensed in the first year.

One detail matters here: because solar is a special-rate asset, it is shut out of full expensing, so the relief comes through the Annual Investment Allowance and, for spend beyond the cap, the 50% First-Year Allowance. Multi-site dealer-group rollouts that exceed the cap get apportioned across both. You can read the official position on capital allowances on GOV.UK, and your accountant should confirm the treatment for your specific structure.

EV charging changes the cost case

Because dealerships are electrifying anyway, the EV-charging spend should be read alongside the solar, not separately. Daytime charging for demonstrators, handovers and staff absorbs solar generation at 100% self-consumption, so the two investments reinforce each other. The combined business case is stronger than either project alone, and the grant landscape (covered in detail in our grants and funding guide) offsets a large share of the charger cost. The Smart Export Guarantee handles whatever you do export. Designing PV and chargepoints together also avoids paying twice for grid works and groundworks.

Funding it without touching your capital budget

If capital is the blocker, most dealers fund the system without dipping into the budget for the customer-facing side of the business. A power purchase agreement (PPA) delivers the array with zero capex, and you pay a per-kWh rate below your current grid tariff from day one, so you save money immediately with the system off your balance sheet. Asset finance keeps the system on the balance sheet but spreads the cost over 7 to 15 years and is typically cash-positive from year one. Operating leases suit dealer groups that want a predictable per-site monthly cost across an estate.

An illustrative worked example

As an illustrative composite, not a real named client or project: picture a multi-franchise dealership with a glazed showroom, a busy aftersales workshop and a customer car park, with an electricity bill in the region of £52,000 a year and a manufacturer environmental standard to meet. A design of around 160 kW across the showroom and workshop roofs, roughly 296 panels, would generate in the region of 148,000 kWh a year and save something like £35,000 annually, for a simple payback near 5.2 years. The qualifying cost would be written off in year one under the Annual Investment Allowance, and any paired forecourt chargers would attract grant support. Scale that to a 200 kW design with a forecourt carport and the generation rises toward 190,000 kWh, with self-consumption staying high thanks to the workshop, showroom and charging loads. Every figure here is illustrative and depends on your franchise, roof, forecourt, load profile and tariff.

Putting numbers to your own site

The honest answer to “what will it cost us” is that it depends on your real load, and the only way to size it properly is from your meter data. We never simply fill the roof: we start from at least twelve months of half-hourly readings and the shape of your trading day. To get a feel for the figures before committing, try our savings calculator for an indicative range, read the funding routes on the grants and funding page, see the full breakdown on our cost guide, or look at the sector detail on our car dealership and showroom solar page. When you are ready for real numbers, request a free feasibility and we will model it from your own consumption rather than a rule of thumb.