A major survey of health concerns of people in Mr Fluffy houses has been extended.

The survey has been extended until Friday July 8, to give people more time to have their say.

The survey is being conducted by ANU, and is examining the physical and psychological effects associated with living in a Mr Fluffy house.

The houses were insulated with loose-fill asbestos insulation in previous decades, and are the subject of a multi-billion dollar restoration programme.

The survey aims to give a clear picture of the overall health impact of residential exposure to loose-fill asbestos.

"The survey is vital to inform us about the health issues associated with the Mr Fluffy issue affecting the Canberra community. It is important that as many people as possible complete the survey," said chief investigator Associate Professor Martyn Kirk, from the ANU National Centre for Epidemiology and Population Health.

The survey is strictly confidential and gives Mr Fluffy house owners, tenants and their families a chance to comment on how loose-fill asbestos insulation has impacted on their health.

It forms the third stage of the ACT Asbestos Health Study, funded by the ACT Government.

Associate Professor Kirk said the findings of the survey would be provided in a de-identified report to ACT Health and would continue to inform the response to this important community issue.

Loose fill asbestos insulation was installed in more than 1,000 Canberra houses between 1968 and 1979.

Current, recent or former residents who have not completed the survey, but would like to do so, should use the original email link provided by the Asbestos Response Taskforce. People who cannot find the original invitation can contact the Taskforce by phone on 13 22 81.