01
Relevant experience
Ask for comparable roofs and property constraints, familiarity with the relevant network process and evidence of how Welsh planning questions are handled.
02
Written design
Require named equipment, layout, annual generation method and inputs, shading assessment, electrical scope, permissions assumptions and exclusions.
03
Commercial checks
Confirm the legal contracting party, payment protections, subcontracting, warranties, fault response, complaint path and what happens if the proposed design changes after survey. Confirm both MCS certification and RECC membership, with registration numbers you can check independently — if you'd rather skip the search, our enquiry-referral form matches you with vetted, MCS-certified installers directly.