The Green Homes Grant Made Simple

A whole house approach that allows you to decide what is best for your home from the qualified professionals who know how best to help you

‘Primary’ Measures

You need to select what the government are calling a ‘primary’ measure or home improvement for the Green Homes Grant before you are eligible for the listed ‘secondary’ measures.

The amount you spend on the primary measure will inform how much you are supported for your secondary measure.


  • Solid wall
  • Cavity wall
  • Under-floor insulation (solid floor; suspended floor)
  • Loft
  • Flat roof
  • Room in roof
  • Park home insulation

Low carbon heat

(where the home is suitably insulated):

  • Air source heat pump
  • Ground source heat pump
  • Solar thermal
  • Biomass pellet boilers

‘Secondary’ Measures

Secondary measures are only available for voucher support after you have completed your first measure application.

Windows and doors:

  • Draught proofing
  • Double/triple glazing (where replacing single glazing)
  • Secondary glazing (in addition to single glazing)
  • Energy efficient replacement doors

Heating controls and insulation:

  • Hot water tank thermostats
  • Hot water tank insulation
  • Heating Controls (Smart heating controls, zone controls, intelligent delayed start thermostat and thermostatic radiator valves)

RetrofitWorks is a cooperative — this means that we have a network of contractors, desginers, and managers who join us and work together to offer services to reduce energy bills and carbon emissions.

For any local area we work, RetrofitWorks creates a scheme with a local brand and processes that suit local customers. We currently have schemes live in Greater London, Oxfordshire, and Sussex.

Ecofurb works across London, providing a whole house approach to improving the energy efficiency of your home.

Cosy Homes Oxfordshire is a one-stop-shop home retrofit service, enabling homeowners to improve the energy efficiency of their homes throughout Oxfordshire.

Warmer Sussex is a partnership of local organisations working together to make the journey to an energy efficient home as straightforward as possible.

A free Warm Home Check service is available all year round for the most vulnerable people in East Sussex. So far the scheme has helped hundreds across the county.

Frequently Asked Questions

Homeowners & Property Owners

Q. When will the Green Homes Grant program start?

A. The Green Homes Grant is projected to start accepting applications at the end of September 2020, and end in March of 2021.

Q. I have seen your information and/or come from the government website–what’s the next step?

A. The next step to submitting a successful application for the Green Homes Grant is to have quotes for the measures you are interested in completing. The government is advising that you have up to three quotes for each measure you are interested in. At RetrofitWorks, we can help gather those quotes for the measures you’re considering from our

Q. How much does the voucher cover?

A. What the voucher covers up to two thirds of the qualifying home improvements, the maximum amount being £5,000. If you receive government benefits, there is the potential for 100% of your home improvements, the maximum being £10,000.

Q. Can I get a quote from RetrofitWorks?

A. Certainly! RetrofitWorks takes a Whole House approach to assessments, making it easier to qualify for more than one measure. Our process consists of having one of our highly qualified surveyors visit your property, and create a Whole House Plan, which informs you of the best ways to save money, energy, CO2, and which measures would be most appropriate for you to undertake. From there, you can make an informed decision which measures you prefer, and our trusted installers will send quotes and make the required installation.

Contractors & Installers

Q. What certifications do I need in order to be eligible to install Green Homes Grant contracts?

A. You need either MCS or PAS 2030 and to be registered with TrustMark.

Q. Does RetrofitWorks offer TrustMark accreditation?

A. Yes we do!

Q. How can I apply for TrustMark accreditation through RetrofitWorks?

A. First you must become a member of the RetrofitWorks cooperative–an excellent means of keeping up to date with industry knowledge, having access to expert installers in your field and others, as well as warm interested leads. To begin the first step, visit: