Why warehouse roofs need feasibility first
UK warehouses and logistics sheds are among the most photographed rooftops in commercial solar marketing - vast, flat, and apparently ideal. In practice, warehouse solar feasibility is rarely a simple area calculation. Portal-frame structures, asbestos cement profiles, limited roof access, night-shift lighting loads, and G99 grid applications all shape whether a project is worth pursuing.
Estates teams, asset managers, and owner-occupiers commissioning warehouse solar feasibility need an independent view: not a sales quote dressed as analysis, but a documented test of yield, payback, and risk at screening level. That is what a fixed-fee feasibility report is for.
What makes warehouse sites different
Warehouse and distribution buildings share traits that distinguish them from offices or retail units. Understanding these early avoids expensive surprises after you have committed to structural surveys and DNO applications.
- Roof area and utilisation. A 50,000 sq ft roof may only support a fraction of its footprint once setbacks, plant, skylights, and fire routes are excluded.
- Structural form. Steel portal frames and metal-deck roofs are common. Feasibility flags whether additional loading is likely to be straightforward or contentious before you appoint a structural engineer.
- Consumption profile. Refrigeration, conveyors, and EV charging can create strong daytime demand - or almost none, if the building is lightly occupied. Self-consumption assumptions must reflect actual or forecast load.
- Grid connection. Arrays above G98 thresholds require a G99 application. Reinforcement costs, export limits, and queue times can change the business case materially.
- Tenure and landlord consent. If you lease the building, feasibility outputs support conversations with the landlord about reinstatement, access, and who benefits from the savings.
What a warehouse solar feasibility report covers
Stage1Energy produces a 29-page site feasibility report for any named UK commercial roof. For warehouses, the same scope applies - with emphasis on the constraints that matter for large industrial buildings.
The report includes concept panel placement on your roof plan, hour-by-hour generation modelling, a 25-year financial model with sourced assumptions, and four engineering screening flags covering wind, structure, DNO, and planning. You receive a written pursue, pursue with conditions, or park verdict reviewed by a human before release.
Outputs are feasibility-grade and built for board-level decision-making, not detailed design or procurement. See the example report for the full structure and level of detail.
When to commission warehouse solar feasibility
Feasibility fits early in the process - after you have identified a candidate building, but before structural calculations, planning submissions, or installer tenders. Typical triggers include:
- A net-zero or EPC improvement programme across a logistics portfolio
- Landlord consent negotiations for a tenant wishing to install PV
- Board approval for capex on a single distribution centre
- Comparison of two or more warehouse sites before committing survey budget
- Response to an installer quote that needs independent validation
If you are unsure whether a full report is justified, start with a waiting list. Send one building address and receive a plain verdict within three working days on whether a full assessment is worth commissioning.
How Stage1Energy works for warehouse projects
Stage1Energy is built around board-ready feasibility - not open-ended consultancy. The site assessment is via the waiting list, delivered in five working days, with the same standard whether you assess one warehouse or batch several sites in parallel.
Remote assessment using aerial imagery, roof plans, and consumption data is usually sufficient at this stage. A physical roof survey is a separate, later step if the project progresses and the feasibility verdict is pursue.
For broader context on commercial rooftop PV in the UK - building types, typical constraints, and how feasibility fits the wider process - see commercial rooftop solar UK.
From feasibility to installation
A pursue verdict does not mean you are ready to build. It means the case is strong enough to justify spending on structural surveys, DNO applications, and detailed design. A park verdict saves you that spend on a site where economics or engineering constraints are unlikely to resolve favourably.
Either outcome is valuable. Warehouse solar projects that fail late - after surveys, after grid offers, after board approval based on optimistic figures - waste far more than the cost of an early feasibility report. Testing the case properly at the front of the process is the rational place to spend.
Common warehouse solar pitfalls feasibility avoids
Three mistakes recur on UK warehouse solar projects. First, gross roof area is treated as array capacity - ignoring plant, setbacks, and access routes that can halve usable space. Second, export-heavy economics are assumed where refrigeration or handling equipment would support strong self-consumption if modelled correctly. Third, G99 grid costs and timelines are deferred until after board approval, when reinforcement quotes can overturn the case entirely.
Feasibility catches these at screening level with sourced calculations and explicit assumptions. Estates teams and asset managers receive a document they can defend internally - not a marketing PDF from a contractor whose incentive is to maximise system size. That independence matters most on warehouses, where scale invites optimism and late-stage failures are expensive.