MIS 3002 V6.0 is mandatory for every MCS-licensed solar installation from 18 June 2026. If you install MCS-licensed solar, it changes what you must hold on file before you start, not after, not on request, before.
What the standard requires
A documented structural assessment and a wind loading calculation, as evidence on file, before installation. A visual judgement that a roof looks suitable, or a mounting-supplier datasheet on its own, does not meet it.
What changed, and what did not
The engineering did not change. Roof loads do not get heavier overnight, and the BS EN 1991 Eurocodes with the UK National Annexes were always the correct basis: BS EN 1991-1-4 for wind with the UK National Annex, BS EN 1991-1-3 for snow, and BS EN 1990 for load combinations. What the standard changes is that documented evidence becomes the rule rather than the exception. The discretion some installers relied on no longer satisfies it.
What this means in practice
If a documented structural assessment is already part of your standard job set-up, nothing changes for you. If it was treated as optional, it now has to be evidenced, in a form Building Control and insurers will accept, before the install proceeds. The runway is short, so the practical question is which deliverable gives you compliant evidence fastest.
The file needs to show the assessment was done against the standard and signed by a qualified structural engineer, with a clear Pass, Pass-with-condition, or Fail outcome. A number without a calculation chain behind it is not evidence.
The route to compliant evidence
For a straightforward, well-documented roof, a Desktop Structural Roof Loading Report gives you the documented assessment and wind loading calculation against the standard, with a clear conclusion, on a 48-hour delivery target from confirmed scope. For an older, undocumented, financed or uncertain roof, the on-site structural survey is the thorough, lender-ready route: the surveyor verifies the structure as built rather than as assumed. Most projects start with the desktop stage, which often tells you whether a site visit is needed.
When does MIS 3002 V6.0 become mandatory?
18 June 2026, for all MCS-licensed solar installations.
What evidence do installers need on file?
A documented structural assessment and a wind loading calculation, completed before installation and signed by a qualified structural engineer.
Does a mounting-supplier datasheet satisfy the standard?
On its own, no. The standard expects a documented assessment against the BS EN 1991 Eurocodes with the UK National Annexes, not a generic datasheet.
Where Solar Surveys Helps
For the fast compliant route on a documented roof, see the Desktop Structural Roof Loading Report. For the thorough route on an uncertain or financed roof, the on-site structural survey is the lender-ready answer. For a plain-English walk through the standard, download the free MIS 3002 V6.0 guide.
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