Solar Contract
12-Point Checklist
Check these 12 things before you sign a solar panel contract in Scotland.
Quick answer
Before signing a solar contract in Scotland, confirm the installer's MCS number, the exact panels, inverter and battery, the system size, an insurance-backed workmanship warranty, a modest protected deposit, a cooling-off period and who handles grid notification. Tick each item below against your written quote, and do not sign until every one checks out.
Last updated: 1 November 2026
1. Installer's MCS Number
MCS (Microgeneration Certification Scheme) number must be on the quote. Verify it at mcscertified.com.
How to check: Ask: 'What's your MCS number?' Then visit mcscertified.com and search for the installer.
2. Panel Brand and Model
Exact manufacturer and model number. Not just 'solar panels' — you need specifics.
How to check: Check quote says e.g. 'Longi LR5-54HIH-410M' not just 'Longi panels'. Google the model to check datasheet.
3. Inverter Brand and Model
Inverter is critical. Cheap inverters fail first. Check warranty separately from panels.
How to check: Demand brand and model. Common good brands: SolarEdge, Fronius, Fox ESS, Solis.
4. kWp System Size
Total system size in kilowatt-peak (kWp). Must match your survey and roof capacity.
How to check: Check quote says e.g. '4.5kWp system' — this determines generation and savings calculations.
5. Estimated Annual Generation (kWh)
How many kWh the system will generate per year based on YOUR postcode and roof orientation.
How to check: Typical: 4.5kWp = 4,000-4,500 kWh/year in Scotland. If quote says 6,000+ — be suspicious.
6. Workmanship Warranty Period
Installer's guarantee on the installation quality. Minimum 10 years. Anything less is a red flag.
How to check: Check contract section on warranties. Must say 'workmanship warranty: 10 years minimum'.
7. MCS Certificate — When Will You Receive It?
MCS certificate proves compliant installation. Required for SEG payments. You should get it within 2 weeks of install.
How to check: Ask: 'When do I receive the MCS certificate?' Answer should be '7-14 days post-install'.
8. DNO Notification — Who Handles It?
Your Distribution Network Operator (DNO) must be notified. This is the installer's responsibility, not yours.
How to check: Ask: 'Do you handle DNO notification?' If they say 'you do that' — walk away.
9. Payment Schedule
Never pay everything upfront. Expect a modest deposit, with the balance on completion. Never pay in full before install.
How to check: Check contract payment terms. Red flag: 'Full payment required before work commences'.
10. Cooling-Off Period
Consumer Contracts Regulations 2013 give you 14 days to cancel if signed at home or remotely.
How to check: Check contract says: '14-day cooling-off period from date of signature'.
11. Dispute Resolution
Installer should be registered with a consumer code like HIES for independent dispute resolution.
How to check: Ask: 'Which consumer code are you registered with?' Check membership at hiesscheme.org.uk.
12. What Happens If Company Ceases Trading?
If installer disappears, your warranty may be worthless. A consumer code membership provides insurance-backed protection.
How to check: Ask: 'Is the workmanship warranty insurance-backed?' If no consumer code membership — high risk.
Related guides
Want quotes you can check against this list?
Every quote we arrange is written and itemised, so you can tick off all 12 checks. We install through MCS-certified partners. Interest-free credit up to £30,000, subject to status.
FAQ
Questions about solar contracts
What is the most important thing to check in a solar contract?
The most important check is the installer MCS number, because it confirms the installation meets recognised standards and is needed for export payments. Verify it at mcscertified.com before signing anything else.
Should I pay a deposit for solar panels?
A modest deposit of 10 to 25 percent is normal, with the balance due on completion. Never pay the full amount before installation begins. Check the contract states the deposit amount and payment schedule clearly.
What is a cooling-off period and do I get one?
Consumer Contracts Regulations give you a 14-day cooling-off period to cancel if you signed at home or remotely. Your contract should state this. If it does not mention a cooling-off period, ask why before signing.
What is an insurance-backed workmanship warranty?
An insurance-backed warranty means if the installer ceases trading, the warranty is still honoured by the insurer. This protects you for the duration of the workmanship guarantee, typically 2 to 10 years. Always ask if the warranty is insurance-backed.
Who handles DNO notification for solar panels?
The installer is responsible for notifying your Distribution Network Operator (DNO) of the installation. If they say that is your job, walk away. It is part of a professional installation.
What consumer code should my solar installer belong to?
Your installer should be registered with a consumer code such as HIES, which gives you access to independent dispute resolution. Ask which consumer code they belong to and verify membership before signing.