The HVCA has voiced concerns over various aspects of government policy following the consultation on the Green Deal.
A key issue is that assessors will have to be highly qualified individuals with a broad range of skills.
These will need to cover the fabric of the building, its engineering services and the impact of its occupants on energy consumption, says the association.
The requirement for assessors to have professional indemnity insurance cover could prove costly, deterring small and medium-sized firms from entering the market.
There is also a lack of clarity over how these policies would be policed, especially when an assessor has ceased to trade, says HVCA.