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BEFORE YOU SIGN

Questions to Ask an Installer

Good questions turn verbal reassurance into evidence. Ask for answers in writing and require important promises to appear in the final contract.

Reviewed 10 August 2026 · Independent household decision support

Knowledge Centre

Specification

  • What exact products and capacities are included?
  • What design calculations support this specification?
  • Which items are optional, provisional or excluded?
  • What changes could increase the price after survey?

Performance and cost

  • Which tariffs, usage and export assumptions support the saving?
  • What range of outcomes should I reasonably consider?
  • Which maintenance and replacement costs are excluded?
  • Can I see the complete calculation?

Protection

  • Who is the contracting legal entity?
  • Which certification applies and how can I verify it?
  • What protects my deposit?
  • Which workmanship and product warranties apply?
  • What is the complaints process?

Handover

  • Which certificates, registrations and manuals will I receive?
  • Who handles the grid or building-control process?
  • When is the final payment due?
  • Who corrects defects and within what time?

Use this guide

Keep important answers in writing and make sure they appear in the final contract.

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QuoteGuardian content is general information—not financial, legal or engineering advice.

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