We’ve been asked more and more lately about Granny Flats, also known as Accessory Dwelling Units;
What are they, how did they exist, and can I build one on my property?
- To construct a secondary dwelling unit, your property’s lot size must be a minimum of 3,000 square feet in total.
- ADU must be at least 600 square feet if your lot size is 3,000-5,444 square feet
- ADU must be at least 700 square feet if your lot size is 5,445-9,000 square feet
- ADU must be at least 800 square feet if your lot size is 9,001-10,000 square feet
- ADU must be at least 900 square feet if your lot size is 10,001-up
- ADU cannot be more than 50% of primary dwelling interior square footage (i.e, if home’s interior is 1200 sq ft, the ADU cannot be more than 600 sq ft)
- ADU must not exceed absorbing 40% or more of yard space if placed in your backyard
- ADU must include a full kitchen: this means having a sink, food storage, and permanent cooking facilities, like an oven or stove
- ADU must have a separate bedroom under 400 square feet (if you’re not using a studio layout)
- No more than one bathroom in the ADU
- A maximum storage/closet size of 60 square feet
- On the exterior, ADU must use facade materials that match the primary dwelling unit, including similar roofing, siding, windows, and doors; the architectural form of the unit should match as well, with similar roof pitch and form
- ADU may or may not be attached to the existing structure
- Rear and side setbacks can be 5-feet in size.
- Legally permitted structures, like a garage, do not need to conform to setback regulations. This makes garage conversions ideal for ADUs
- ADU cannot be built on parcels that already have multi-family properties
- ADUs are allowed in residential zones R-1, R-2, and R-M