Important notice

The T-ZERO website is no longer being updated, or marketed to those who may be seeking to refurbish their homes.

We will continue to allow limited access to the tool to registered users. If you wish to continue to use T-ZERO in any capacity, please be aware that:

  • Cost and technical information is likely to be out of date and inaccurate
  • The tool does not cover the latest policy developments, for example it does not consider Feed in Tariffs (FITs), the Renewable Heat Incentive (RHI), or Green Deal and this will affect the tool’s financial assessments.
  • Government’s approved assessment methodology has been updated from the version used within T-ZERO.

Therefore, we strongly advise against making any decisions based upon the results gained from T-ZERO from this point forward.

We hope you found T-ZERO useful during the time that it was fully operational and gained insight into how to best refurbish your home as a result.


Know what you're looking for? Browse the companies listed on the T-ZERO marketplace to find the green home improvement products and services you need.

Business Zone

Suppliers and contractors, register your products and services for free on the Marketplace and give users the opportunity to contact you directly through the site.
T-Zero is brought to you by a partnership of leading UK organisations in the fields of housing and energy efficiency

View case studies of homes like yours to see what can be done. Tell others about your own green home improvements

Browse detailed information about the home improvement options available to you. Find out about grants and finance. 
T-ZERO accepts no responsibility for work carried out to properties after using this website. If in doubt, always contact a qualified person before choosing, buying or installing home improvements.