This page is for homeowners ready to pick one installer from several options. It sets out the steps, the main criteria and a simple way to decide. It focuses on the choice itself, not on finding firms. Our qualified provider list guide covers where to find certified installers.
For the broader overview, read our guide: Any Qualified Provider List for UK Homeowners.
Independent guide. We are not a lender or a government body. Always check current scheme rules with the official provider.
Steps to choose
Follow these steps in order. Each step narrows your shortlist. You end with one installer you have checked and compared.
- Shortlist installers from the MCS and TrustMark registers.
- Verify each installer's certification and consumer code.
- Get two or three written, itemised quotes.
- Compare protection, warranties and price.
- Ask follow-up questions and get answers in writing.
- Choose, then use the seven-day cooling-off period to review the contract.
Top selection criteria
Some criteria are essential and others help you decide between good options. Treat the first three as pass or fail. Use the rest to compare.
- MCS certification for installer and products (essential).
- RECC or HIES membership (essential).
- A written, itemised quote (essential).
- Deposit protection and a workmanship warranty of at least two years.
- Insurance-backed guarantee, where offered.
- Clear answers to your questions.
A simple decision framework
Score each installer that passes the essential checks. Give one point for each extra protection they confirm in writing. Then compare total cost alongside the score. If two installers tie, choose the one whose answers were clearest.
Frequently asked questions
What matters most when I choose an installer?
MCS certification, a consumer code and a written quote. Without these, many schemes will not fund the work.
Should I choose the cheapest installer?
Compare protection and warranty as well as price. A slightly higher quote with better protection can suit you better.
Can I change my mind after signing?
RECC and HIES members give you a seven-day cooling-off period.
Do you recommend installers?
No. We are independent and point you to official registers.
So you can choose one installer using clear criteria rather than sales pressure.
WHLS Editorial Team
Our editorial team writes independent, plain-English guides on home energy finance. We review guides when scheme rules change.
References
- MCS – Find an installer (opens in a new tab)
- TrustMark (opens in a new tab)
- RECC – Renewable Energy Consumer Code (opens in a new tab)
- HIES – Home Insulation and Energy Systems (opens in a new tab)
- Energy Saving Trust – Consumer protection (opens in a new tab)
- Financial Conduct Authority – Financial Services Register (opens in a new tab)
