Car Dealerships & Showrooms: Solar panels for dealerships

Why a car dealership is one of the best solar sites on any high street

A franchised dealership runs almost its entire electrical load in daylight, which is exactly the profile that makes solar panels for dealerships pay back so quickly. Glazed showrooms are lit and climate-controlled through trading hours, the workshop runs compressors, ramps, diagnostics and extraction all day, and forecourt and signage lighting layer on top. Because that demand sits squarely under the generation curve, a rooftop array on a dealership is consumed on site rather than exported at a lower price, and self-consumption is the single biggest driver of solar payback. That is why dealership projects sit among the faster-paying commercial installs we deliver, with a typical simple payback near 5.5 years. Unlike feed, fuel or stock, electricity is a cost you can fix for two decades with a one-off investment, and in a sector where margins on the metal are thin and aftersales does much of the heavy lifting, a predictable energy bill is one of the few levers a dealer principal genuinely controls.

The other force pushing dealerships toward solar is the franchise itself. As manufacturers electrify their ranges, EV-era franchise agreements increasingly mandate on-site renewables and customer charging as a brand standard, and demonstrator and customer charging absorbs midday generation at full self-consumption value, the most valuable kWh on the system. Solar and charging are stronger together than either project alone: the panels meet the franchise requirement and the daytime charging soaks up the generation, while the Workplace Charging Scheme grant offsets the charger cost. On top of the bill saving, an array on the showroom roof gives the business an auditable net-zero story for the manufacturer, for fleet and contract customers, and for the EPC of a leased site, the kind of evidence buyers and franchisors now ask for rather than the pledge they used to accept.

What a typical install looks like and how we size it

For a dealership we usually design a system in the 50 to 400 kW range, which is roughly 92 to 740 panels across about 400 to 2,800 square metres of showroom and workshop roof. A system that size generates in the region of 46,000 to 370,000 kWh a year and saves between 11 and 85 tonnes of CO2 annually. We never simply fill the roof. Sizing in this sector is driven by daytime baseload, not roof area, so it comes from at least twelve months of half-hourly meter data and the real shape of your trading day, because a single-franchise showroom has a very different load curve to a multi-marque site with a busy aftersales workshop. Where workshop and showroom demand is high and steady, we size toward 80 to 90% of daytime load for maximum self-consumption, and we model EV-charging growth, demonstrators, staff vehicles and customers, into the load before we settle on the final figure. Where the showroom and workshop roofs are the constraint, the forecourt is usually the biggest untapped surface you own, and a solar carport over customer or demonstrator parking adds capacity while giving shaded, EV-ready bays at the entrance. We assess almost every roof and surface type: trapezoidal and profiled metal with a clip or rail fix, standing-seam metal with a clamp fix and no penetration, single-ply membrane and built-up felt on flat showroom roofs taking a ballasted system, and concrete. Asbestos cement roofs on older workshop blocks cannot be retrofitted and need replacement first, which is why we check the build-up before we quote rather than on the day.

Costs, payback and tax relief

A dealership project typically lands between £45,000 and £350,000 depending on showroom size, workshop footprint and how much carport you add, with a simple payback near 5.5 years and the electricity effectively free for the fifteen to twenty plus years after that. The biggest financial lever is tax. Solar PV is a special-rate plant and machinery asset, so the 100% Annual Investment Allowance lets most dealership businesses write off the first one million pounds of qualifying spend against profit, which is up to a 25% effective tax saving in year one for a limited company. Note that solar is a special-rate asset and does not qualify for full expensing, so we use the AIA or, on spend above the cap, the 50% First-Year Allowance. The Smart Export Guarantee pays for any surplus you export, though a dealership self-consumes most of what it makes, so SEG is a smaller part of the case than the avoided import. If capital is the blocker, most dealers fund the system without touching the budget for the customer-facing side of the business: a power purchase agreement delivers the array with zero capex and a per-kWh rate below grid from day one, while 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. Our cost guide sets out worked numbers for showroom-only, showroom-plus-workshop and carport-inclusive designs.

Funding routes in detail

The headline tax route is the 100% Annual Investment Allowance, which fully expenses a single-site install within the one million pound cap; group rollouts that exceed the cap split across the AIA and the 50% First-Year Allowance. Because dealerships are adding EV charging anyway, the Workplace Charging Scheme is the grant that matters most. Administered by the Office for Zero Emission Vehicles, from 1 April 2026 it pays £500 per socket, up from £350, and up to £20,000 per applicant, up from £14,000, covering up to 75% of the purchase and installation cost across up to 40 sockets, and it pairs directly with on-site solar because daytime charging self-consumes generation. The scheme has been extended for a final year and closes permanently on 31 March 2027, so the application should be made well before then. The Smart Export Guarantee tops up the case for any exported units: all MCS-certified installs up to 5 MW qualify, larger licensed suppliers must offer at least one export tariff, and rates are supplier-set and unregulated, typically 4 to 15p per kWh in 2026, so it pays to shop around. Where a dealer group is energy-intensive enough to hold a Climate Change Agreement, on-site PV reduces metered grid consumption and directly improves CCA performance, though most motor-retail businesses sit outside the eligible sectors. We map and apply for the right combination rather than leaving it to you.

Compliance and sector considerations

The point most specific to dealerships is the manufacturer. Corporate-identity standards may dictate where panels can sit and what EV-charger provision is required, so we design to those CI rules from the outset rather than retrofitting around them. The workshop carries its own considerations: paint, fuel and solvent areas fall under COSHH and DSEAR, so we zone the electrical works carefully around them. Rooftop PV on commercial buildings is generally permitted development under Class A Part 14 of the GPDO 2015 within size limits, with listed buildings and conservation areas excluded; a solar carport over the forecourt needs planning permission. A G99 application is required for connections above 17 kW per phase, though many larger dealerships have an existing HV connection that simplifies integration; smaller or older premises may have a constrained supply needing a DNO upgrade. A structural survey of the showroom and workshop roofs is mandatory before any load goes on, and on a phased EV-era refurbishment the SPF1981 v3 rooftop fire-safety standard is increasingly an insurer requirement. Larger dealer groups can fall within ESOS Phase 4, whose compliance notification is due 5 December 2027, and on-site solar is one of the most credible recommendations such an audit can identify. We also build to the standards procurement teams expect: MCS commercial certification for SEG eligibility, NICEIC or NAPIT electrical accreditation, RECC and TrustMark, OZEV-approved status for the charging works, and ISO 9001, 14001 and 45001 where the franchisor requires them. Where a site is leased, on-site solar improves the EPC against the MEES standard expected to rise to EPC B by 2030, which protects the lettability and value of the unit.

How we approach this kind of project

We start from your half-hourly meter data, not a roof plan, so the system is matched to the load your showroom and workshop genuinely draw, with EV-charging growth modelled in. We design the PV and the chargepoints as one project so daytime charging self-consumes generation and the Workplace Charging Scheme application is handled for you. We assess the forecourt carport alongside the roof as standard, because it is usually the largest surface available. We survey the roof build-up and check for asbestos cement on older workshop blocks before we quote, never on the day of the install, since asbestos sheeting cannot take panels and needs replacing first. We submit the G99 grid application early, alongside the structural survey, because the DNO connection is often the longest pole on the programme, taking six to eighteen months on capacity-constrained networks, so we start that clock immediately. We schedule the physical works, typically one to eight weeks depending on size, around your trading and aftersales pattern, working in zones, with the only real outage being the final grid connection of four to eight hours booked for a quiet period. You receive a fixed-price proposal, the workmanship is covered by an insurance-backed warranty, and after commissioning we provide annual operations and maintenance and 24/7 remote monitoring with automated underperformance alerts, so a dealer group sees live generation and lifetime CO2 saved across every site on a single dashboard.

An illustrative example

As an illustrative composite, not a real named client or project: picture a multi-franchise dealership with a large glazed showroom, a busy aftersales workshop and a customer car park, where the manufacturer's EV programme required on-site renewables and visitor charging. Working from the meter data, a design in the region of 200 kW across the showroom and workshop roofs, with a solar carport over part of the forecourt, would generate roughly 190,000 kWh a year. With the workshop and showroom load running through the day and demonstrator and customer charging absorbing the midday peak, self-consumption would be high, the qualifying cost would be written off in year one under the Annual Investment Allowance, and the carport chargers would be part-funded through the Workplace Charging Scheme. The design would then be templated for rollout across the wider group, with a single monitoring dashboard covering every site for both the facilities team and manufacturer ESG reporting. Every figure here is illustrative and depends on your franchise, roof, forecourt and tariff.

When you are ready, see worked numbers in our cost guide, map the schemes on the grants and funding page, request a free feasibility from your meter data, or read the solar FAQs first. Dealer groups that also run forecourt convenience space or retail-park sites may find our pages on supermarket and convenience solar and retail-park solar useful too.