How to choose an installer

Installers for energy efficiency improvements

For all energy efficiency improvements, consider choosing a Trustmark registered installer. The Trustmark quality scheme is endorsed by the government.

To make sure you’re getting the best value, it’s also a good idea to get at least three quotes from different installers.

Insulation

For insulation measures, choose installers who are members of the National Insulation Association (NIA) or other recognised trade associations or guarantee schemes.

You can use the NIA’s website to find an installer near you.

With any type of insulation you should check that your installer is taking ventilation into account. This will help you avoid any issues with damp or mould.

Cavity Wall Insulation

If you’re considering cavity wall insulation, choose a Cavity Insulation Guarantee Agency (CIGA) registered installer.

Solid Wall Insulation

For external or internal wall insulation, make sure the installer offers a 25-year guarantee. This will be backed by an insurance company or come from the Solid Wall Insulation Guarantee Agency (SWIGA).

Installers for renewable technology

For renewables like solar panels and heat pumps, choose an installer that’s Microgeneration Certification Scheme (MCS) certified. This is a quality mark to give you confidence in your renewable system.

You can also use the MCS website to find a renewable installer near you.

Energy storage systems

For energy storage systems like solar pV batteries and heat batteries, check your installer is:

• MCS certified for the system your battery connects to
• A member of the Chartered Trading Standards Institute (CTSI) accredited consumer code
• Fully trained by the system’s manufacturer and meets all their guidelines
• Following the Institute for Engineering and Technology‘s code of practice (this only applies to electric batteries).

Find installers through our EcoCosi service

Our EcoCosi retrofit service can connect you with a network of trusted installers for both energy efficiency and renewable upgrades.

Everyone in the EcoCosi contractor network is pre-vetted. They hold the relevant quality assurance status, have achieved the required certifications, and have the appropriate level of experience to carry out your retrofit. For extra peace of mind, contractors must also follow our contractor code of conduct.

Find out more