The feasibility of a granny flat depends on the property zoning in Poway. A small region (mostly along Espola) allowed for a guest house or a second dwelling unit. If the granny flat will have a separate kitchen then the second dwelling restrictions apply.
You can get the latest info by visiting Poway City Hall in Civic Center Dr.
Here are few things I learnt during my last check
– the property must be on septic
– guest house/granny flat area is 25% of the main residence (500-1500sf)
– attached/detached single level similar architecture to the main house
– new septic/sewer is required if the existing septic capacity does not support the guest house
– if a new septic is required the lot should have sufficient useable land to support i) existing septic’s backup leach fields ii) new septics leach field + a backup
– a guest house can not have a kitchen
– any new construction over 499 sf has a special school assessment fees for the entire project
– second dwelling unit requires a minor development review
– one of the units should always be owner occupied
– space for a one car attached/detached garage in case of a second dwelling unit
