population idea: domestic labour

Hello fellow captains,
Ok so here's the idea: settlements "reserve" a portion of the population for domestic labour, which means they are unavailable to be assigned as workers.
Each housing type would have it's own "base" level of reservation. For example, Housing I reserves 40% of the population. Housing II reserves 32%. This decrease in reservation represents the higher quality of the housing.
Services could reduce this base reservation level for the attached housing units. Adding a water facility would reduce the reservation by 4%. This represents the convenience of plumbing: no need to spend time going to the old watering hole. Adding electricity would reduce the reserved population by an additional 2%. Household appliances would make the most sense in terms of a reduction in the reservation. Appliances are a method of "automatic" domestic labour.
Minimum reservation would be 1-5% (to represent folks who never work, like children and disabled colonists.)