How much do solar panels for distribution centres cost?

A solar installation on a distribution centre is one of the few capital projects in logistics that pays for itself and then keeps paying. The honest answer to what it costs is that it depends on how big your roof is, how much electricity you burn during daylight, and how you choose to fund it. A typical warehouse install lands between £350,000 and £2.4m for systems of 500 kW to 3 MW. Last-mile depots at 100 to 400 kW run roughly £90,000 to £340,000. The largest port and inland-port distribution sheds reach £4m at 5 MW. Below we set out the real numbers so you can sanity-check any quote you receive.

Cost per kW by system size

The single most useful way to benchmark a distribution-centre solar quote is cost per kilowatt of installed capacity. Larger systems are cheaper per kW because the fixed costs of scaffolding, design, grid connection, and mobilisation spread across more panels. For 2026, indicative pricing is:

• £750 to £950 per kW for systems of 100 to 500 kW, the range for last-mile depots and smaller fulfilment units.
• £700 to £850 per kW for systems of 500 kW to 2 MW, the bulk of clear-span distribution sheds.
• £650 to £800 per kW for systems above 2 MW, the largest distribution centres, port warehouses, and inland ports.

Cold-chain and large distribution centres often achieve £600 per kW or below at scale, helped by simple clear-span roofs and a single point of connection. If a quote sits well above these bands, ask what is driving it: a re-roof, a long cable run to the intake, or a constrained grid connection are the usual reasons, and each should be itemised rather than buried in a single headline figure.

What drives the variation

Two distribution centres of the same floor area can carry very different solar costs. The roof is the first variable. Modern profiled-steel and single-ply membrane roofs take ballasted or clamped mounting systems quickly and cheaply. Older buildings with asbestos cement roofs cannot be retrofitted at all, and the right move is usually a combined re-roof plus PV where the energy saving helps fund the new roof. Sprinkler systems are the second variable: we design every layout to LPC clearance standards and obtain insurer sign-off before fabrication, which costs design time but avoids the far larger cost of a rejected install.

Electrical infrastructure matters too. Many distribution centres have generous existing capacity inherited from heavy industrial use, which keeps connection costs down. Others need a larger transformer or a contestable connection, which a half-hourly meter assessment and a DNO budget estimate will flag early. Wind exposure drives ballast weight under BS EN 1991-1-4, and coastal or estuary sites need marine-grade fixings that add a little to the bill but a lot to the life of the system.

Hidden costs to check in any quote

A fair distribution-centre solar quote includes the structural survey, the G99 grid connection application and any DNO works, scaffolding or mast-climber access, the inverter and switchgear, monitoring, commissioning, and the insurance-backed workmanship warranty. The costs that catch people out are the ones left off cheap quotes: a re-roof where the existing covering will not last the panels' 25-year life, a DNO reinforcement charge on a constrained network, or out-of-hours working to avoid disrupting a 24-hour operation. We price all of these in from the start so the fixed-price proposal is genuinely fixed.

How distribution centres fund solar

There are three routes, and the right one depends mostly on whether you own or lease the building.

Cash purchase with capital allowances. If you own the building and have the capital, buying outright gives the strongest lifetime return. Solar PV qualifies as plant and machinery, so most installs are fully expensed in year one under the 100% Annual Investment Allowance up to £1m, an effective tax saving of up to 25% for limited companies at current corporation tax rates. A 1 MW owned system costing around £750,000 might attract roughly £180,000 of first-year tax relief, and then deliver a quarter of a million pounds of avoided grid cost every year on a high-self-consumption site.

Asset finance. Spreading the cost over five to seven years keeps capital free for the core business. For a distribution centre with high daytime load, the monthly finance payment is usually lower than the monthly electricity saving from day one, so the project is cash-flow positive immediately while you still build equity in the asset and claim the allowances.

Power purchase agreement. For tenants on shorter leases, or owners who want zero capex and an off-balance-sheet structure, a PPA puts a third party in to own and operate the array. You simply buy the electricity it generates at a fixed rate below grid retail. There is no upfront cost, the PPA provider takes the technical and lease risk, and you lock in price certainty against volatile wholesale markets. Several of the worked examples on our location pages, including a 1.2 MW M1-corridor distribution centre, were funded exactly this way.

Reading payback the right way

Simple payback, the capital cost divided by the annual saving, is the figure most people quote, and for a strong distribution-centre site it lands around 5 to 5.5 years. Cold-storage warehouses, where 24-hour refrigeration drives self-consumption above 90%, routinely reach 4 to 5 years, the fastest payback in UK commercial solar. But simple payback ignores the 20 years of generation after the system has paid for itself, so the better measures are internal rate of return and net present value over the 25-year design life. Distribution-centre installs typically model an IRR in the mid-teens to high-twenties, with cold chain at the top of that range. We provide a full discounted cash flow with every fixed-price proposal so you can see the whole picture, not just the headline.

Cost versus the grid

The reason these numbers work is the gap between the cost of self-generated solar and the cost of grid electricity. A distribution centre buying power at retail rates, plus the TNUoS and BSUoS network charges that have risen 40 to 80% since 2022, is paying far more per kWh than a paid-off rooftop array delivers. Every kilowatt-hour you self-consume from your own roof is a kilowatt-hour you do not buy at the worst of those prices. On a 24-hour site that self-consumes most of what it generates, that is where the six-figure annual savings come from.

What happens next

The fastest way to get a real number for your site is to send us your half-hourly meter data and roof drawings. We model the system, the generation, the self-consumption, and the financials, and come back with an indicative proposal within 7 working days, no site visit needed for the first pass. If the numbers work, our engineers survey the building and we issue a fixed-price proposal with full PVSyst yield modelling and a DCF. See our grants and funding guide for the capital allowances and finance routes in detail, then request your free quote.