Multi-Tenant Leased Warehousing: Solar panels for warehousing

Solar for multi-let industrial estates and shared warehousing

A multi-let industrial estate is the most valuable roof estate in UK logistics and the one least likely to have solar on it. You have several occupiers under one landlord, sometimes several units under one roof, each on its own lease and its own supply meter, each drawing power on its own pattern. The aggregate daytime demand across those tenants is usually strong - a terrace of trade-counter, light-industrial and storage units running through the working day adds up to a serious base-load - yet the acres of clear-span steel-portal roof above them typically sit empty. The reason is never the physics or the economics. It is that nobody has yet answered the one question that decides every multi-let scheme: who pays for the array, and who gets the benefit of the power it makes.

That question matters more here than on any single-occupier shed, because on a multi-let estate the party that would fund the capital cost (the landlord, who owns the roof) is usually not the party that pays the electricity bills (the tenants, who hold the demised supplies). Solve that split, and everything else falls into place - because the underlying numbers are good. Grid electricity sits at roughly 25-45p/kWh, and from April 2026 the TNUoS network element of every imported unit rises by around 60% and keeps climbing through the decade. That increase hits every occupier on the estate. A well-designed array turns the estate’s largest unused asset into fifteen to twenty years of cheaper daytime power, cuts every occupier’s exposure to rising network charges, and - for the landlord - lifts EPC ratings and protects lettability under the Minimum Energy Efficiency Standards.

How we size a multi-let system - load-led, from aggregate half-hourly data

Warehouse solar is a load-led job, never a roof-led one, and on a multi-let estate that principle has an extra dimension: we size against the combined daytime load of the occupiers, not the total roof area. A roof-fill array on a mixed estate over-generates against demand and dumps cheap export, wrecking the return the same way it does on a single low-base-load shed.

So we start from twelve months of half-hourly (HH) meter data - ideally from each demised supply plus the landlord’s common-area (landlord’s-supply) meter - and build an aggregate daytime consumption profile for the estate. That combined profile is usually healthier than any single unit’s, because different occupiers peak at different times: a food-prep unit early, a distribution unit through the afternoon, trade counters across the whole day. We design the array to match that aggregate load, targeting annual generation equal to roughly 60-85% of daytime consumption, which is where self-consumption across the estate is maximised.

As a planning rule, about 100-140 kWp fits per 1,000 m² of usable clear-span roof, and only around 40-60% of a gross roof is usable once rooflights, plant and setbacks are removed. UK generation runs at roughly 900 kWh per kWp per year. But roof area is rarely the binding constraint - the constraints are the aggregate consumption profile and the DNO import/export capacity across the estate’s connections. Across a multi-let scheme self-consumption typically lands in the 60-75% range once the metering is arranged, and we model growing that load into more of the roof over time as tenants electrify materials-handling equipment (MHE) and add last-mile EV-van charging. See the cost breakdown for the full £/kWp ladder by system size.

The defining blocker for multi-let - metering and the split incentive - and how we solve it

Here is the objection that stops most multi-let solar projects before they start: the landlord owns the roof and would pay for the array, but the tenants pay the electricity bills, so why would the landlord fund it - and how does the solar power even reach the right meters across separate leases and separate supplies?

This is the split-incentive problem, and it is the single defining blocker of the sub-vertical. On a single-occupier shed the same party owns the roof and pays the bill, so the case is simple. On a multi-let estate the value leaks across the ownership boundary: capital cost sits with the landlord, benefit sits with the tenants, and the physical supplies are fragmented across demised meters that the generation cannot legally cross without the right arrangement. Left unsolved, the project stalls not because it doesn’t pay but because nobody can see how they get paid.

There are three proven ways to structure the answer, and the right one depends on the estate’s metering and lease terms:

1. Private-wire / embedded-network supply. We design a private wire from the array into an embedded network behind a single point of connection, so the estate’s generation is distributed to the units through a landlord-operated or third-party-operated licence-exempt supply. Occupiers buy their solar-generated daytime power through that network at a rate below grid; the landlord (or a supply partner) recovers the capital and operating cost through the per-kWh charge. This is the cleanest route where the estate has, or can be re-arranged to have, a suitable metering topology - it turns solar into a supply proposition rather than a cost the landlord simply swallows.

2. Service-charge recovery. Where a private wire isn’t practical, the landlord funds the array and recovers the cost through the estate service charge, with the benefit passed to occupiers as cheaper landlord-supplied common-area power and, where the leases allow, allocated daytime supply. This keeps the mechanism inside the instrument the estate already uses to share costs, and green-lease clauses set out the recovery and the pass-through fairly.

3. Landlord-funded with a green-lease uplift. On institutional estates the landlord often funds the array as an asset-value and lettability play - solar lifts the EPC rating (see below) and commands a green premium on rent and yield - and shares the energy benefit through green-lease terms agreed at rent review or re-gear. A Power Purchase Agreement can sit underneath any of these, putting a third-party funder on the roof so the landlord carries no capex.

Whichever route fits, the work is the same up front: we map every demised and shared supply, model the aggregate load, and agree the metering and green-lease terms before anything is installed - because retrofitting a billing structure onto a live array is far harder than designing it in. Our guide on putting solar on a leased warehouse as a tenant or landlord walks the lease mechanics through in full.

Compliance and technical: sprinklers, insurer, DNO and structure

Multi-let sheds are usually sprinklered and frequently sub-divided by demising walls into separate fire compartments, so the fire and metering design carry extra weight. We design all four gates in from the first drawing.

Fire and insurance. We work to LPC / RISCAuthority RC62 guidance on rooftop PV - spacing from sprinkler zones and firewalls, DC isolation and rapid shutdown - and we obtain the insurer’s pre-design sign-off before anything is fabricated. On a multi-let estate the array crosses demising and fire-compartment lines, so we lay it out around the fire strategy and the boundary between units, and engage each affected party’s insurer as a standard step, not an afterthought.

Grid connection. Anything above a few hundred kW needs a G99 application to the DNO, and a multi-let estate may sit behind more than one connection. We map the import and export capacity across every supply first, and where a connection is tight we design for high self-consumption with G100 export limitation, plus a battery if it helps, so the scheme isn’t held up waiting on network reinforcement. On systems over 1 MW we plan around 12-24 month DNO timelines and the post-2026 grid-queue reforms from day one.

Structure. For arrays over roughly 1,000 m² we run a structural loading assessment for the additional dead load and wind uplift (to BS EN 1991-1-4), and an asbestos management survey on any roof built before 2000 - common on older multi-let terraces. Non-penetrative clip-fix mounting on standing-seam and trapezoidal metal roofs preserves the roof warranty, with no penetrations.

EPC and MEES. For the landlord this is often the clincher. On-site solar is modelled through SBEM in each unit’s commercial EPC and typically lifts a warehouse one to three bands (indicative, not guaranteed; a fresh EPC must be lodged after install to capture it). The minimum EPC needed to let a commercial building is band E today. The government has confirmed an intention to require EPC B for buildings over 1,000 m² from 2031, but that is pending secondary legislation, not yet law - and the widely-quoted “EPC C by 2027 / B by 2030” pathway was formally dropped in June 2026. Solar is usually the biggest single EPC uplift per pound spent, which is why it reads as a lettability and asset-value move on a multi-let estate as much as an energy one. Read the current position in the non-domestic MEES guidance.

An illustrative scenario

The following is an illustrative example based on typical projects, not a specific named client - it uses planning-grade figures within our standard 100 kW-2 MW band.

Take a multi-let industrial estate of six units under one institutional landlord - a mix of trade-counter, light-industrial and ambient storage occupiers - with a combined daytime electricity spend across the demised and common-area supplies of around £310,000 a year, and a large expanse of clear-span roof sitting empty. The individual occupiers had each dismissed solar as “not our roof”; the landlord had parked it as “not our bill”.

Sized from twelve months of aggregate HH data across the supplies, a 600 kW array (roughly 1,110 panels, non-penetrative clip-fix) generates about 540,000 kWh a year. We structure it as a private-wire embedded network: the landlord funds the array - writing most of the capex off in year one through the £1m Annual Investment Allowance - and recovers it by selling the solar-generated daytime power to the occupiers at a rate below grid. Occupiers see roughly £108,000 a year off their combined electricity cost, self-consumption across the estate runs at around 68%, and the array lifts several units’ EPC ratings, protecting lettability under MEES. On the landlord’s capital case, payback lands at about six years, before the rent and yield uplift from the improved EPC ratings is counted. Green-lease terms setting out the supply and recovery are agreed before install, so the billing works from the first invoice.

Multi-let warehouse solar FAQs

We run a multi-let estate - how does solar work fairly across several tenants? The question on a multi-let scheme is always who pays and who benefits. We design either a private-wire/embedded-network supply, a service-charge recovery model, or a landlord-funded structure with green-lease terms, so the generation is allocated fairly across demised and shared supplies. Landlords use it to lift EPC ratings and protect lettability under MEES; tenants get cheaper daytime power. We map every meter, model the aggregate load, and agree the metering and lease terms before install - that’s the part that makes or breaks the scheme.

The landlord owns the roof but the tenants pay the bills - why would the landlord fund it? Because on a multi-let estate solar is an asset-value and lettability play, not just an energy one. It lifts EPC ratings through SBEM (protecting lettability under MEES, minimum band E now, with EPC B for larger buildings proposed from 2031, pending legislation), and commercial premises with PV typically carry a green premium on rent and yield. Where the landlord doesn’t want to carry the capex, a Power Purchase Agreement puts a third-party funder on the roof instead. Either way the energy benefit is shared with occupiers through a private-wire supply or the service charge, agreed in the green lease.

Can the solar power actually reach separate meters on separate leases? Not without the right structure - and that’s the technical heart of these projects. Generation can’t cross demised supplies on its own. We solve it with a private wire into a landlord-operated or third-party embedded network (occupiers buy solar power through it below grid), or through service-charge allocation where a private wire isn’t practical. We map the metering topology up front so the physical and commercial arrangement match. See the grants and funding page for the AIA, business-rates and export mechanisms that improve the underlying numbers.

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Multi-let leased estates are one operator type among several we design for. If your model is different, see our pages on 3PL and contract logistics - where a PPA structured around the customer contract solves a shorter-tenure blocker - and e-commerce fulfilment operations, where steady automation load pushes self-consumption toward 80%. When you’re ready for indicative numbers on your own estate, request a quote and we’ll size it from your half-hourly data within seven working days.