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, giving dealerships a typical simple payback of around 5.5 years. 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.

There is a sector-specific driver that pushes dealership solar harder than most: the move to electric vehicles. EV-franchise manufacturers increasingly mandate on-site renewables and customer charging as a brand standard, so for many dealers solar is becoming a requirement rather than an option. Demonstrator and customer EV charging absorbs solar generation at full self-consumption value, which is the most valuable kilowatt hour on the system, so the two projects are far stronger together than apart. On-site solar also improves the unit's EPC ahead of the MEES EPC B standard expected for commercial property in 2030, which matters for leased forecourt sites where the landlord is increasingly motivated 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 we size it

For a car dealership or showroom we usually design a system in the 50 to 400 kW range, roughly 92 to 740 panels across about 400 to 2,800 square metres of showroom and workshop roof, generating in the region of 46,000 to 370,000 kWh a year and saving somewhere between 11 and 85 tonnes of CO2 annually.

We size from the load, not the roof. The glazed showroom, workshop equipment and forecourt lighting give a strong daytime base, and we model expected demonstrator and customer EV-charging growth into the load before final sizing because that charging absorbs midday generation at full self-consumption value. We pull at least twelve months of half-hourly meter data 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, which sits naturally alongside the EV-era brand image manufacturers now want their dealers to project.

Modelling the EV-charging growth is the part of the sizing that needs the most care on a dealership, because the charging load is rising fast and a system sized only to today's demand can be undersized within a couple of years. We project the chargepoint rollout the manufacturer expects, layer it onto the metered showroom and workshop base, and size the array so that the growing daytime charging continues to self-consume the generation as the fleet electrifies. That forward view is what keeps the dealership at high self-consumption over the life of the system rather than only at commissioning, and it is why we treat the PV and the chargepoints as one designed-together project rather than two separate installs.

Costs, payback and tax relief

A dealership project typically runs £45,000 to £350,000 depending on showroom and workshop size and whether canopies or a carport are included, with a simple payback near 5.5 years and the electricity effectively free for the years after that.

Solar PV is a special-rate plant-and-machinery asset, so the 100% Annual Investment Allowance lets the dealer write off qualifying cost against profit in year one, worth up to a quarter of the spend back as tax for a company paying corporation tax, and a single-site dealership install sits well inside the £1m AIA cap. Because solar is a special-rate asset it does not qualify for full expensing, so we use the AIA. The Smart Export Guarantee pays for any surplus, though with strong daytime and EV-charging load most generation is self-consumed, so the return is driven mainly by avoided import. Our 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 draw on the Workplace Charging Scheme, so a project that bundles both captures two distinct sources of support at once. The chargers also raise the dealership's daytime self-consumption, which improves the payback on the array, so the parts reinforce each other financially as well as meeting the manufacturer brand standard. We present the combined business case so the dealer can see the full picture rather than judging each element in isolation.

Funding routes in detail

Plant and Machinery Capital Allowances are the foundation, 100% AIA up to £1m, and a single-site dealership install sits well inside the cap and is expensed in year one. The standout route for dealerships is the Workplace Charging Scheme, which pairs directly with the on-site solar and the manufacturer EV mandate: from 1 April 2026 it contributes up to £500 per socket and up to £20,000 per applicant, covering up to 75% of charger purchase and installation across as many as 40 sockets, but it closes permanently on 31 March 2027, so the application should go in well before then.

The Smart Export Guarantee covers exported power. Dealers that prefer to keep capital free for stock can use a power purchase agreement, paying per kWh below grid with the array off balance sheet and savings from day one, or asset finance over seven to fifteen years that is usually cash-positive from year one. For a multi-site dealer group we standardise one design and roll it across the estate with portfolio pricing, a phased capital plan and a single monitoring dashboard, so the manufacturer brand standard and the EV-charging requirement are met consistently at every site rather than negotiated afresh each time. Where the forecourt is leased, we model both dealer-funded and landlord-funded routes.

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 we design to those standards from the outset rather than retrofitting 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 is needed above 17 kW per phase, which a dealership comfortably exceeds, and the DNO connection can run six to eighteen months on a constrained network, so we submit early; many larger dealerships have an existing three-phase or HV supply that helps. Rooftop PV is generally permitted development under Class A Part 14 within size limits, while forecourt canopies and a carport need planning permission. A roof structural survey is mandatory, we check for asbestos, we work to the SPF1981 v3 rooftop fire-safety standard, and where works pass 30 person-days CDM 2015 applies. Where the forecourt is leased, landlord consent and service-charge structuring apply, and MEES EPC B in 2030 is the direct driver for the unit's EPC.

How we approach this kind of project

We size from your 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 we design the PV and the chargepoints as one project to the manufacturer CI standard. We assess the showroom and workshop roofs alongside the forecourt and customer parking, we zone the workshop install carefully around COSHH and DSEAR areas, and we commission a structural survey and a roof and asbestos check before we quote.

We submit the G99 application early to start the connection clock, and we schedule the works around showroom and workshop hours so trading and servicing continue, with the only outage being the short final grid connection. You receive a fixed-price proposal covering the capital, PPA and finance routes, with the Workplace Charging Scheme application handled for you, and the work is backed by an insurance-backed warranty with annual operation and maintenance and 24/7 remote monitoring. For a dealer group we deliver one repeatable design with a single monitoring dashboard giving live generation and lifetime CO2 saved across every site.

An illustrative example

As an illustrative composite based on a typical UK dealership project: a franchised dealership with a large glazed showroom, a busy workshop and a forecourt of demonstrators, where the manufacturer's EV-era brand standard required on-site renewables and customer charging and electricity had become a significant overhead. The dealer installed around 250 kW across the showroom and workshop roofs with a forecourt canopy, generating in the region of 230,000 kWh a year. Demonstrator and customer charging absorbed much of the midday generation at full self-consumption value, the chargepoints were part-funded under the Workplace Charging Scheme, the qualifying cost was relieved under the Annual Investment Allowance, and the design met the franchise CI standard. The figures are illustrative and depend on your showroom, workshop load, charging demand, tariff and roof.

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, request a free feasibility, or start with the solar FAQs.