Choose a solar installer who explains the design for your roof and answers questions about the complete installation. Certification and consumer protection checks still matter, but they are not the whole selection process. Ask how the proposed panels, inverter and any battery fit your home and electricity use. This guide focuses on solar-specific questions rather than repeating the detailed verification checklist.
For the broader overview, read our guide: Solar Arrays UK.
Independent guide. We are not a lender or a government body. Always check current scheme rules with the official provider.
1. Ask how the survey shapes the design
Give each installer the same electricity information and explain planned changes to your home. Ask how roof space, condition, direction and shading affect the proposed array. Request an explanation of any assumptions made before a full survey. A standard package description should not replace a written design for your property.
Ask why the firm recommends the proposed panel layout and inverter model. Request a separate reason for optimisers, battery storage or other optional equipment. If the installer proposes a larger or smaller system than another firm, ask it to explain the difference. Keep the answers with the quote rather than comparing only panel counts or totals.
For roof repairs or a roof-integrated design, ask who is responsible for related roofing work. Confirm how the installation will be accessed and whether scaffolding is included. Ask how equipment can be reached later for inspection or repair. Any part handled by another contractor needs a clear responsibility and schedule.
- Ask the installer to explain the survey findings and proposed layout.
- Request exact panel, inverter and battery models where applicable.
- Ask for written reasons for optional equipment and design differences.
2. Confirm connection and installation responsibilities
Ask who handles network operator notification or approval and how it affects the installation schedule. Confirm that the firm has identified the route applicable to your proposed system. Request the records you should receive after completion. Do not accept an assurance that every solar installation has identical connection requirements.
Discuss planning checks if the building, location or proposed installation needs particular consideration. Listed buildings and conservation areas need property-specific advice, not a sales promise that panels are always permitted. Ask what the installer expects you to arrange and contact the local planning authority where needed. Record any approval assumptions before signing the installation contract.
If funding is involved, check the scheme's requirements before choosing equipment or a contractor. Some providers arrange installers or require approval for the proposed work. Ask the installer how its quote separates solar, storage and any heating upgrade. Keep its sales advice separate from the funding provider's actual decision and conditions.
3. Ask about commissioning and aftercare
Request a handover demonstration showing normal operation, generation monitoring and fault reporting. Ask which MCS, electrical and network records the installer will supply for your system. Confirm who handles equipment warranty claims and workmanship issues. Keep a named aftercare contact rather than relying on the salesperson's mobile number alone.
Use the linked verification guide to check the company's identity, MCS certification and relevant consumer code membership. Use the comparison checklist to record deposits, written scope, warranties and finance checks. Those broader checks complement the solar design questions above. They do not replace an explanation of how this installation fits your individual property.
Compare three written quotes before deciding, using the same brief and clear inclusion questions. Ask for missing information or revisions when equipment and responsibilities differ. Reject pressure to sign before you understand the proposal and protection arrangements. Choose a firm only after its technical explanation and written commitments make sense together.
Checklist
- I understand the survey-based solar design.
- I know why optional equipment is proposed.
- I confirmed roof, planning and network responsibilities.
- I know what handover and aftercare I will receive.
- I used the verification and comparison guides.
Frequently asked questions
What should I ask about my roof?
Ask about condition, direction, shading, panel layout, safe access and repairs before fitting. Request a written explanation of the proposed design.
Should my installer explain optional equipment?
Yes. Ask what problem each item addresses at your home and whether an alternative design is possible.
Who should confirm my funding eligibility?
The relevant scheme provider decides. Treat installer advice as guidance, not as a grant award or confirmation of unpublished loan eligibility.
Where can I check my installer's credentials?
Use the linked installer verification guide and official registers. Then use the comparison checklist alongside these solar-specific questions.
So you can select an installer whose solar design, responsibilities and aftercare are clearly explained.
WHLS Editorial Team
Our editorial team writes independent, plain-English guides on home energy finance. We review guides when scheme rules change.
References
- Energy Saving Trust – Solar panels (opens in a new tab)
- Planning Portal – Solar equipment planning checks (opens in a new tab)
- GOV.UK – Register energy devices (opens in a new tab)
- Energy Saving Trust – Solar panel cleaning and maintenance (opens in a new tab)
- Electrical Safety First – Solar panels (opens in a new tab)
- MCS – Find an installer (opens in a new tab)
- Energy Saving Trust – Consumer protection (opens in a new tab)
