Im a surveyor, and have inspected thousands of council properties over the years to assess levels of compliance with the governments Decent Homes standard (producing reports for contractors to bring the houses up to meet the standard).
Whilst different authorities take slightly different interpretations of the legislation, generally speaking they set out to ensure that all houses / flats are:
– Warm
– Dry
– Easy to heat, and control the temperature in different rooms
– Have reasonably modern* facilities (kitchen and bathrooms)
(* reasonably modern = less than 30 years old!!)
Any rented property should have received a non-intrusive survey for asbestos, and if any was identified, the asbestos management procedure would of stipulated whether it needs to be removed or not (remember asbestos takes many forms, and does not always need to be removed, ie, it could be encapsulated and / or in good condition – not releasing fibres)
Was your sisters house inspected for the decent homes standard?