Choose the unit before counting
People, households, census houses and buildings describe different things. Several people may share a household, and a building may contain several separately occupied spaces. A household count is therefore often a more relevant starting point for a shared domestic service than the number of individual residents. It still does not reveal how many purchasing decisions or subscriptions will follow.
Read the housing table’s universe
The Census 2011 Houselisting and Housing Census tables describe housing conditions, amenities and assets. HL-01 classifies households by the condition of the census houses they occupy and excludes institutional households. Other HL tables cover particular facilities and possessions. Read each table’s title and notes: a percentage of households cannot be relabelled as a percentage of people or buildings.
The household total used for an amenities table should come from that table’s own universe. Combining a numerator from one housing table with a denominator from a population table can produce an apparently precise but incompatible percentage.
Use historical access to frame newer questions
A historical amenities profile can identify useful questions for local research: which water source was recorded, whether a facility was within the premises, or which assets were included. Newer NFHS household indicators provide survey evidence under their own definitions. NFHS-6 covers the 2023–24 round, is provisional and excludes Manipur. Check the exact indicator before comparing it with an older census question.
Turn context into a practical brief
For a home service, define the catchment, household type and required facility, then list the evidence still needed on current access, affordability and use. Historical possession of an asset does not establish its condition or current availability. Present missing local information as a research gap rather than filling it with a national average.