Solar is a long-term investment in a fast-moving market. If you're getting multiple quotes (we'd encourage you to), these are the questions that quickly separate good installers from the bad:
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"Who certifies your electrical work — and who signs it off?"
NICEIC registration means the electrical work is signed off by a qualified supervisor and independently assessed — ask for the registration number and check it on the NICEIC register. Make sure the quote includes the install certificate, DNO notification and SEG setup, because SEG eligibility depends on that paperwork being in order.
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"What's your 3D shading and yield model showing?"
Anyone can quote a generic 4kW system on a generic UK roof. A real installer should show you a 3D shading model of your specific Washington property with month-by-month generation projections — sometimes called a PVGIS, Solcast or Aurora model. Ours is included in every quote.
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"Who does the install — your team, or a subcontractor?"
Many solar firms are essentially sales operations that subcontract install to whoever's available locally. That model is fine for marketing margins but the install quality varies week-to-week. We do every Washington install with our own engineers — same team that designed your system.
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"What's your post-install warranty and how do I make a claim?"
"Lifetime warranty" usually means nothing. A real warranty has a defined coverage period (workmanship: 5-10 years; inverter: 10-12 years; panels: 25 years for performance), a clear claims process, and an installer that's been operating long enough to honour it. Ask for an example warranty document before signing.
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"Show me one of your installs near Washington I can visit."
Reputable installers will have customer-consented references in your local area. If they can't suggest anyone within a 30-minute drive, they probably don't actually install much locally — they sell leads or operate a sales-led franchise. We can connect you with prior Washington-area customers willing to share their experience.