What is the most important item on this checklist?

Getting 3+ MCS-certified quotes. Price variation between installers is 20-40% for identical systems. The cheapest quote isn't always best — compare warranties, brands, and reviews alongside price.

How long does the whole process take?

From first enquiry to panels generating: 4-8 weeks. Quote stage: 1-2 weeks (site surveys). Decision: as long as you need. Installation: 1-2 days. DNO notification: handled by installer (4-8 weeks background process).

What if I skip the roof check?

Risk: installing solar on a roof that needs replacing in 5 years. Result: panels removed (£500-£1,000), roof replaced (£5,000-£15,000), panels reinstalled (£500-£1,000). Expensive mistake.

Do I really need 3 quotes?

Essential — prices vary 20-40% between installers for the same system. Even 'good' companies can be overpriced for your specific installation. 3 quotes gives you market context and negotiating power.

Solar Installation Checklist

Last updated: 18 March 2026

Independently written

Solar checklist — 15-point checklist before installing solar. Don't sign until you've checked everything.

What should I check before installing solar?

Complete solar panel installation checklist: PRE-QUOTE: (1) Check roof age — if over 20 years, consider re-roofing first. (2) Check roof direction — south/east/west are suitable. (3) Assess shading — trees, chimneys, nearby buildings. (4) Check electricity bill — annual kWh consumption. (5) Get a smart meter installed (free). GETTING QUOTES: (6) Get 3+ quotes from MCS-certified installers. (7) Compare: total price, panel brand, inverter, warranty, kWh estimate. (8) Check reviews on Trustpilot, Google, Which? Trusted Traders. (9) Ask about hybrid inverter (for future battery). (10) Confirm scaffolding included in price. PRE-INSTALLATION: (11) Notify home insurer about solar. (12) Check planning (conservation area/listed building?). (13) Review finance terms if applicable. (14) Confirm installation date and duration. (15) Clear roof access (trim overhanging branches, move cars from drive). POST-INSTALLATION: Register for SEG, download monitoring app, understand your system.

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