Car Dealerships & Showrooms: Solar panels for shopping centres

Why car dealerships and showrooms are a high-load surface in any retail scheme

Car dealerships and showrooms run a high daytime electrical load that lines up well with solar generation. Large glazed showrooms need lighting and comfort cooling, the workshop runs ramps, compressors and diagnostic equipment, and forecourt lighting adds to the draw, all through the trading day. That daytime profile means a well-sized array is consumed on site rather than exported at a lower price, and self-consumption is the single biggest driver of solar payback. The physical fit is good too: big flat showroom and workshop roofs suit rooftop PV, and the forecourt and customer parking offer canopy and carport surfaces where roof area is limited. Within a retail park or roadside retail scheme, the dealership is one of the larger and more power-hungry units, which makes its roof and forecourt a productive part of the asset.

A sector-specific driver for dealership solar is the move to electric vehicles. Demonstrator and customer EV charging absorbs solar generation on site, so the two projects are stronger planned together than apart. On-site solar also improves the unit's EPC. The current MEES minimum is EPC E, and the government has proposed EPC B from 2031 for let buildings over 1,000 m2 where cost effective, subject to secondary legislation, which matters for leased forecourt sites where the landlord may want to support PV.

This is the dealership detail that most distinguishes it from other retail tenants. On a supermarket or a gym, EV charging is a welcome addition that happens to absorb generation; on a dealership it is increasingly mandated by the franchise and sits at the centre of the proposition. A dealer needs charging for its own demonstrator fleet, for vehicles in for service, and for visiting customers, and that demand lands squarely in daylight hours when the showroom is open. Pairing it with solar means a large slice of that charging is met at full self-consumption value rather than from the grid, which both satisfies the manufacturer requirement and turns a cost into part of the energy strategy. The combined business case for solar and chargepoints together is consistently stronger than either project on its own.

What a typical dealership install looks like and how it is sized

A system is sized from the load, not the roof. The glazed showroom, workshop equipment and forecourt lighting give a strong daytime base, and expected demonstrator and customer EV-charging growth should be modelled into the load before final sizing because that charging absorbs midday generation at full self-consumption value. At least twelve months of half-hourly meter data is the usual basis, to match the system to real demand rather than an optimistic maximum. Where roof area is the constraint, forecourt canopies and a customer-parking solar carport add capacity while making a visible sustainability statement at the entrance.

Modelling the EV-charging growth is the part of the sizing that needs the most care on a dealership, because a system sized only to today's demand can be undersized as the charging load grows. A sound approach projects the expected chargepoint rollout, layers it onto the metered showroom and workshop base, and sizes the array so that the daytime charging continues to self-consume the generation as the fleet electrifies. That forward view keeps self-consumption high over the life of the system rather than only at commissioning, and it is why the PV and the chargepoints are best treated as one designed-together project rather than two separate installs.

Costs, payback and tax relief

Project cost depends on showroom and workshop size and whether canopies or a carport are included. Payback depends on the share of generation used on site, import tariffs and the installed price, so ask the installer for an itemised price per kWp.

Solar PV is a special-rate plant-and-machinery asset, so the 100% Annual Investment Allowance (£1m) usually gives a business under the limit full relief in year one, at the company's own corporation tax rate, and spend above it can claim the 50% first-year allowance. Because solar is a special-rate asset it does not qualify for full expensing, so the AIA is the relevant relief. The Smart Export Guarantee pays for any surplus at supplier-set rates, though where daytime and EV-charging load is strong most generation is used on site, so the return is driven mainly by avoided import. The cost guide works through the numbers including the EV-charging element.

It is worth assessing the solar and the chargepoints as a single combined investment rather than two line items, because the grant and the tax relief land differently. The array attracts the Annual Investment Allowance, while the chargepoints may draw on the Workplace Charging Scheme if the site meets its eligibility rules, including the parking rules. The chargers also raise daytime self-consumption, which can improve the payback on the array. The combined business case should be presented so the full picture is visible rather than judging each element in isolation.

Funding routes in detail

Plant and Machinery Capital Allowances are the foundation: the 100% AIA up to £1m usually gives a business under the limit full relief in year one, and spend above it can claim the 50% first-year allowance. A further route is the Workplace Charging Scheme, which pairs with the on-site solar: it contributes up to £500 per socket (£350 before 1 April 2026), covering up to 75% of purchase and installation cost, up to 40 sockets per applicant, but it closes on 31 March 2027, so apply well before then. The parking must be designated to the applicant and not solely for customers, so check the parking eligibility rules.

The Smart Export Guarantee covers exported power, with rates set by each supplier. Dealers that prefer to keep capital free for stock can consider a power purchase agreement, paying per kWh with the array off balance sheet, or asset finance; compare the terms and cash flow of each against buying outright. For a multi-site dealer group the usual approach is one standard design rolled across the estate with portfolio pricing, a phased capital plan and a single monitoring dashboard, so each site is handled consistently rather than negotiated afresh each time. Where the forecourt is leased, both dealer-funded and landlord-funded routes are worth modelling.

Compliance and sector considerations

The sector-specific factor is the manufacturer corporate-identity standard. Franchise CI rules may dictate where panels can sit and what EV-charger provision is required, so the design should meet those standards from the outset rather than being retrofitted later and risking a clash with the brand requirement.

Workshop areas carry COSHH and DSEAR considerations around paint, solvents and fuel, so those zones need careful electrical design during install. A G99 application and DNO approval before connection are needed above 16 A (3.68 kW) per phase, which a commercial array will exceed; the DNO sets the G99 programme and it is often the longest item, so it pays to submit early. Rooftop PV on a commercial building is generally permitted development in England under Class J of Part 14 of Schedule 2 to the GPDO 2015, within limits, with the council's prior-approval decision on design and external appearance, including glare, needed above 50 kW, while forecourt canopies and a carport need planning permission. A roof structural survey is mandatory, the roof should be checked for asbestos, and CDM 2015 duties apply to the works. Where the forecourt is leased, landlord consent and service-charge structuring apply, and MEES is the direct driver for the unit's EPC: the current minimum is EPC E, with EPC B from 2031 proposed for let buildings over 1,000 m2 where cost effective.

How to approach this kind of project

The system should be sized from half-hourly meter data with realistic EV-charging growth modelled in, because demonstrator and customer charging is what makes the daytime self-consumption so strong, and the PV and the chargepoints are best designed as one project to the manufacturer CI standard. The showroom and workshop roofs should be assessed alongside the forecourt and customer parking, the workshop install zoned carefully around COSHH and DSEAR areas, and a structural survey and a roof and asbestos check completed before a quote is issued.

The G99 application should be submitted early to start the connection clock, and the works scheduled around showroom and workshop hours so trading and servicing continue, with the only outage being the short final grid connection. Ask the installer for a fixed-price proposal covering the capital, PPA and finance routes, for who handles the Workplace Charging Scheme application, and for the warranty, insurance, annual operation and maintenance and 24/7 remote monitoring terms in writing. For a dealer group, one repeatable design with a single monitoring dashboard giving live generation and lifetime CO2 saved across every site is the usual aim.

If the dealership sits within a larger retail scheme, see solar for shopping centres and retail parks, and for the food anchor alongside it see supermarket and convenience solar. When you are ready, read the cost guide and funding routes, send an enquiry, or start with the solar FAQs.