It is the question most commercial solar projects answer too late: can the roof actually carry the array? A solar system adds permanent weight to a roof and changes how that roof responds to wind and snow, for the next twenty-five years. A roof that looks sound is not the same as a roof that has been shown to be sound, and from 18 June 2026 that difference is no longer a matter of opinion.
What decides whether a roof can take solar
Three things govern it: the existing structural capacity of the roof, the additional load the proposed array introduces, and the condition of the roof today. A proper assessment looks at all three together, not the array in isolation. The mounting system, the panels and any ballast all become part of the load the structure has to carry, alongside the wind uplift and snow the finished installation will see across its service life.
A ballasted array can add a meaningful permanent load across a roof that was never designed to carry it, while a mechanically fixed system changes how wind uplift transfers into the structure. Both have to be checked against the building's actual capacity, not assumed from a mounting datasheet.
Why "it looks fine" is not enough
From 18 June 2026, MIS 3002 V6.0 makes a documented structural assessment and wind loading calculation mandatory evidence for every MCS-licensed installation, before install. A visual opinion that a roof "looks suitable" does not satisfy the standard, and it will not satisfy a lender, insurer or Building Control either. The engineering basis is the BS EN 1991 Eurocodes with the UK National Annexes, the same framework a competent assessment has always used.
Find out in 60 seconds
Our free structural pre-check returns an indicative feasibility result for any UK roof in under a minute. It is built on the BS EN 1991 Eurocodes with the UK National Annexes and it is honest about its limits: it is a screening, not the documented assessment the standard requires. What it does well is tell you quickly which way a roof is likely to go.
- Green: the screening found no load concern on the inputs given. A good starting signal.
- Amber: borderline, the band where engineering judgement decides the outcome.
- Red: a likely issue worth resolving before you commit to an install.
The screening is the fast first filter. When you are ready, the documented assessment that satisfies the standard follows, with a 48-hour delivery target from confirmed scope, engineer-signed and Eurocode-verified.
Can any roof take solar panels?
No. Capacity depends on the existing structure, the load the array adds, and the roof's current condition. Many roofs are suitable, but suitability has to be shown, not assumed.
Do I need a structural survey for commercial solar?
In almost every case, yes. From 18 June 2026, MIS 3002 V6.0 requires a documented structural assessment and wind loading calculation on file before an MCS-licensed installation proceeds.
What is MIS 3002 V6.0?
It is the MCS installation standard for solar PV. Version 6.0 makes a documented structural assessment mandatory evidence before installation, effective 18 June 2026.
Where Solar Surveys Helps
Start with the free structural pre-check for an indicative answer in under a minute. For the documented assessment, the on-site structural survey is the thorough, lender-ready route for commercial, financed or uncertain roofs, while the Desktop Structural Roof Loading Report is the fast, compliant option for straightforward, well-documented buildings. For the regulatory detail, see MCS compliance.
THE STRUCTURAL TRINITY
Three Reports That Clear a Commercial Solar Site for Installation
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