Dimensional standards
Height & bulk
Uses
Accessory1
Extracted standards
14 individual requirements pulled out of this section’s prose, each with the sentence it came from.
Height
- Detached accessoryAccessory useA secondary activity customarily incidental to the main use of the lot — a garage, a home office. buildings containing ADUAccessory dwelling unit (ADU)A second, smaller home on a lot that already has one — a garage flat, basement flat or backyard cottage. max 25 ft and 2 storiesStoreysHabitable floor levels. Whether a basement or attic counts is defined by the local code.25 ft
Detached accessory buildings containing accessory dwellings shall exceed neither 25 feet in height nor two stories in height.
Historic
- Detached ADUAccessory dwelling unit (ADU)A second, smaller home on a lot that already has one — a garage flat, basement flat or backyard cottage. in Residential Historic DistrictHistoric districtAn area where exterior changes need design review to protect its character. requires ARB review
A detached accessory dwelling unit located in the Residential Historic District must be reviewed by the Architectural Review Board for consistency with the Historic District Design Guidelines.
Other
- Attached ADUAccessory dwelling unit (ADU)A second, smaller home on a lot that already has one — a garage flat, basement flat or backyard cottage. max 50% of principal floor area50 pct
The gross floor area of an attached accessory dwelling unit may not exceed 50% of the gross floor area of the principal structure in which it is located.
- Detached ADUAccessory dwelling unit (ADU)A second, smaller home on a lot that already has one — a garage flat, basement flat or backyard cottage. max 60% of primary if primary >1000 sqftsq ftSquare feet. An acre is 43,560 sq ft; a typical suburban lot is 7,000–10,000., max 1000 sqftsq ftSquare feet. An acre is 43,560 sq ft; a typical suburban lot is 7,000–10,000.; if primary <1000, max 600 sqftsq ftSquare feet. An acre is 43,560 sq ft; a typical suburban lot is 7,000–10,000.1,000 sqftsq ftSquare feet. An acre is 43,560 sq ft; a typical suburban lot is 7,000–10,000.
If the gross floor area of the primary dwelling on the property exceeds 1,000 square feet, the gross floor area of a detached accessory dwelling unit may not exceed 60% of the gross floor area of the primary dwelling nor more than 1,000 square feet. If the gross floor area of the primary dwelling on the property is less than 1,000 square feet, the gross floor area of a detached accessory dwelling unit may not exceed 600 square feet.
- No more than one ADUAccessory dwelling unit (ADU)A second, smaller home on a lot that already has one — a garage flat, basement flat or backyard cottage. per parcel1 unit
No more than one ADU shall be allowed per parcel containing a primary dwelling.
- Must meet minimum lot requirements for single family
Unless otherwise provided in § 420-4.6, the parcel must meet the minimum lot requirements for a single family residence in the zoning district.
- Owner must occupy principal or ADUAccessory dwelling unit (ADU)A second, smaller home on a lot that already has one — a garage flat, basement flat or backyard cottage.
The owner of the principal building or lot shall be the occupant of the principal dwelling or of the accessory dwelling unit.
- Primary dwelling must exist
An accessory dwelling unit cannot be constructed without the primary dwelling existing on the parcel.
- Separate sale prohibitedProhibitedNot allowed in the district at all, short of rezoning or a variance.
The separate sale of an accessory dwelling unit is prohibited.
- Short-term rentalShort-term rentalA dwelling let to guests for brief stays — the zoning category behind Airbnb rules. in ADUAccessory dwelling unit (ADU)A second, smaller home on a lot that already has one — a garage flat, basement flat or backyard cottage. limited to 45 nights/year in R-1, R-2, R-M45 nights
The host of a short term rental unit that is located in an accessory dwelling unit, is subject to this subsection, and is located in the R-1, R-2, or R-M residential zoning district may not rent the unit for more than 45 nights in each calendar year.
- No separate water meter required; connection requirements
No 'detached accessory dwelling unit' under this article shall be required to have a separate water meter; provided, however, the water and sewer connections... shall meet the following requirements...
Setback
- When rear lot line along alley, min rear yardYardThe open space left between a building and its lot line — the space a setback creates. setbackSetbackThe distance a building must be held back from a lot line. 10 ft10 ft
When the rear lot line runs along an alley, the minimum rear yard setback for a detached accessory dwelling unit shall be 10 feet.
- R-1: nearest wall 10 ft from side lot line, 15 ft from rear lot line
For lots in the R-1 zoning district, the nearest wall of the accessory building shall not be located closer than 10 feet to a side lot line or 15 feet to a rear lot line.
- R-2: nearest wall 15 ft from side lot line, 20 ft from rear lot line
For lots in the R-2 zoning district, the nearest wall of the accessory building shall not be located closer than 15 feet to a side lot line or 20 feet to a rear lot line.
From the ordinance
Accessory dwelling units shall be subject to the following minimum standards: ... No more than one ADU shall be allowed per parcel... The gross floor area of an attached accessory dwelling unit may not exceed 50%... Detached accessory buildings containing accessory dwellings shall exceed neither 25 feet in height nor two stories in height.
Parking requirements
{
"ADU": "If no parking spaces exist, one off-street space required unless adequate on-street parking exists; if 1-2 spaces exist, maintain all; if more than 2, maintain at least 2."
}