Solar Panels for Car Showrooms and Dealership Workshops

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, with a typical dealership payback indicated at around 5.5 years on the assumptions on the cost page. 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 that may push dealerships toward solar is the franchise itself. As manufacturers electrify their ranges, check whether your franchise agreement or the manufacturer's retailer standards set any requirements for renewables, EV-charger provision or signage; if they do, agree panel and charger positions with the manufacturer before design. Demonstrator and customer charging absorbs midday generation at full self-consumption value, the most valuable kWh on the system, and solar and charging are stronger together than either project alone: the daytime charging soaks up the generation, while the Workplace Charging Scheme grant can offset the cost of chargepoints used by staff and fleet. For a business the scheme covers chargepoints that only staff and fleet can use, so customer-only forecourt charging is not eligible; check whether demonstrator vehicles count as fleet. 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 may ask for rather than a pledge.

What a typical install looks like and how systems are sized

A dealership system is typically designed 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. A sound design never simply fills 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, a design can be sized toward 80 to 90% of daytime load for maximum self-consumption, and EV-charging growth, demonstrators, staff vehicles and customers, should be modelled into the load before the final figure is settled. 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. Most roof and surface types can be considered: 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 the build-up should be checked early 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 an indicative simple payback near 5.5 years and, after payback, the system keeps cutting the grid bill for the rest of its working life. 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 relief comes through 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, dealers can often 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 several years and is cash-positive from year one only where the energy saving exceeds the repayments. 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 gives full relief in year one on 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 most worth checking. Administered by the Office for Zero Emission Vehicles, from 1 April 2026 it pays up to £500 per socket, up from £350, 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. For a business the chargepoints can only be used by its staff and fleet, and parking solely for customers is ineligible, so customer-only forecourt charging is not covered; staff and fleet charging may be, and it is worth checking whether demonstrator vehicles count as fleet. 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: licensed suppliers must offer an export tariff above 0p to eligible generators up to 5 MW, rates are set by suppliers and differ widely, so compare current tariffs, and the installation must meet Ofgem's Smart Export Guarantee eligibility rules (certification requirements can depend on system size), so ask any installer to confirm. The right combination of tax relief, grant and finance depends on the group's tax position and the number of sites, so check it with your accountant.

Compliance and sector considerations

The point most specific to dealerships is the manufacturer. Check whether your franchise agreement or the manufacturer's retailer standards set any requirements for renewables, EV-charger provision or signage; if they do, agree panel and charger positions with the manufacturer before design rather than retrofitting around them. The workshop carries its own considerations: paint, fuel and solvent areas fall under COSHH and DSEAR, so the electrical works need to be zoned carefully around them. In England, rooftop solar PV on a showroom, workshop or bodyshop is permitted development under Class J of Part 14, Schedule 2 of the GPDO 2015, subject to conditions: microgeneration (up to 50 kW) is permitted, while roof solar above 50 kW needs the council's prior-approval decision on design and external appearance, including glare. It is not permitted on a listed building or in its curtilage, on a scheduled monument, within 1 m of the roof's external edge, or where a pitched-roof array would protrude more than 0.2 m beyond the roof plane or a flat-roof array would stand more than 1 m above the highest part of the roof; a conservation area does not by itself remove the roof right. Wales and Scotland have their own rules. A solar carport over the forecourt is a structure in its own right, so check planning with the council before design. Up to 16 A per phase (3.68 kW single-phase, about 11 kW three-phase) a connection can use G98 'connect and notify' within 28 days; above that a G99 application and DNO approval are needed before connection, and batteries count if they can export. Many larger dealerships have an existing HV connection that simplifies integration, while smaller or older premises may have a constrained supply needing a DNO upgrade. A structural survey of the showroom and workshop roofs should be completed before any load goes on, and on a phased EV-era refurbishment it is worth asking your insurer what fire-safety requirements it expects for rooftop PV. Larger dealer groups can fall within ESOS Phase 4 (large undertakings with 250 or more employees, or turnover above £44m and a balance sheet above £38m; qualification date 31 December 2026), whose compliance notification is due 5 December 2027, and on-site solar is one of the most credible recommendations such an audit can identify. Where a franchisor or procurement team sets supplier standards, ask any installer to show the relevant electrical, quality and safety registrations; Smart Export Guarantee eligibility has its own certification rules (see Ofgem's guidance for generators), and grant-funded charging works are claimed by an authorised installer. Where a site is let, on-site solar can improve its EPC: a privately rented non-domestic property must currently be EPC E or above, and a higher minimum standard has been consulted on but no date is confirmed. A better EPC also protects the lettability and value of the unit.

When you are ready, see worked numbers in our cost guide, map the schemes on the grants and funding page, send an enquiry from your meter data, or read the solar FAQs first. Dealerships adding chargers should also read solar and EV charging for car dealerships. 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. Regional guides cover Greater Manchester and Leicestershire.