The coverage of electoral rolls on both Ancestry and FindMyPast is very limited.
For House History work you will get far more information from the county archive - they should have copies of the electoral information for the area, but also old maps and other information that will pinpoint when the house was built and more.
A lot depends on the age of the house. If it is of a considerable age you may want to get a specialist to look at it to identify different building phases and likely build dates.