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Choosing the right installer

Energy efficiency improvements

We always recommend you use a Green Deal certified installer, and for solid wall, underfloor, flat roof or room-in-roof insulation, your installer must be Green Deal certified.

If you're installing a gas boiler or carrying out any gas work (including boilers, warm air units and heating controls), installers must be Gas Safe registered by law. The Gas Safe Register has more information on the work this covers, and also tells you if an installer is registered.

If installing an oil boiler, the installer must be OFTEC registered.

For all other energy efficiency improvements there is no requirement to use a specific installer, but we strongly recommend you do the following:

  • Shop around for at least three quotes to give you choice and to ensure good value for money.
  • Make sure your chosen installer is fully qualified and, if possible, accredited with a relevant industry body and/or trade federation.
  • Ask installers what guarantees they provide for the quality of their work and what warranties they supply with the products.

Renewables systems

For renewables systems:

  • Your installer and product must be certified under the Microgeneration Certification Scheme (MCS) for the system they're installing (except for micro-hydro systems). Applications for hydro systems will instead be assessed on a case by case basis and we recommend using an installer accredited by the Renewable Energy Consumer Code (RECC) or recommended by the British Hydro Association.
  • Home Energy Scotland Loan applicants applying for funding to replace any existing renewables systems will be required to provide a letter from an installer detailing why a replacement is the most suitable option for this property, including details of the fault with the existing system. All installations funded by a Home Energy Scotland Loan must be carried out by MCS certified installers – MCS is developing an approach for the maintenance of previously MCS certified installations (including where repair or replacement of faulty components is required). This will help to identify common issues and prevent product replacement where economic repair would be viable and more appropriate.

Please note this loan is not linked to other schemes, and eligibility for this loan is not indicative of eligibility for any other incentives and eligibility criteria may differ.

For advice on potential support available, please call 0808 808 2282.

You can find installers in your area (as well as customer reviews) on Energy Saving Trust's Renewables Installer Finder. For a full list of MCS-certified installers, see the Microgeneration Certification Scheme website.

Energy storage systems

If you’re installing an energy storage system, the installer must:

  • be certified under the Microgeneration Certification Scheme (MCS) for the renewables system that will be working alongside the battery
  • be a member of the Trading Standards Institute accredited consumer code which covers energy storage
  • meet all manufacturers' guidelines for the system being installed, and have undertaken all relevant manufacturer training available in the UK
  • meet the Institute for Engineering and Technology’s code of practice (for electric batteries only).

District heating scheme connections

  • The installer of the connection must be approved by the scheme owner/operator.

​Loans are administered by Energy Saving Trust. Successful loans are subject to an administrative fee of 1.5%, up to a maximum of £150. Work must not commence before a loan offer has been made. For certain improvements, you will need to use a certified installer.

Find out more

Loan overview

Find out who can apply, how much you can borrow and what types of improvements you can make.

Loan in detail

Find out about repayment periods and other conditions of the loan.


Get in touch

Call us on 0808 808 2282 or request a call back today. You can only get an application from our advisors and they’ll also help with any enquiries you may have.