§ 21-3.70-1 Residential uses and development standards.

(a)   Within the residential districts, permitted uses and structures shall be as enumerated in Table 21-3.

(b)   Within the residential districts, development standards shall be as enumerated in Table 21-3.2.

(c)   Additional development standards.

(1)   Maximum height. The maximum height of structures is determined by the building envelope created as the result of the intersection of two planes. The first plane is measured horizontally across the parcel at 25 feet above the high point of the buildable area boundary line. The second plane runs parallel to grade, as described in § 21-4.60(b), measured at a height of 30 feet. If the two planes do not intersect, then the building envelope is determined by the first plane (see Figure 21-3.10).

(2)   Height setbacks.

(A)   Any portion of a structure exceeding 15 feet must be set back from every side and rear buildable area boundary line 1 foot for each 2 feet of additional height over 15 feet (see Figure 21-3.10); and

(B)   Any portion of a structure exceeding 20 feet must be set back from the front buildable area boundary line 1 foot for every 2 feet of additional height over 20 feet.

(3)   Except for cluster housing and planned development housing developed pursuant to § 21-8.50, for zoning lots with one-family or two-family detached dwellings or duplexes:

(A)   The maximum density is a floor area ratio of 0.7.

(B)   The number of wet bars in each dwelling unit must not exceed one.

(C)   The number of laundry rooms in each dwelling unit must not exceed one.

(D)   The number of bathrooms in each dwelling unit must not exceed the following:

 

Zoning lot size (square fee)	Number of bathrooms per dwelling unit must not exceed:
	One dwelling unit on zoning lot	Two or more dwelling units on zoning lot
Up to 6,999	4	2
7,000 to 9,999	6	3
10,000 and up	8	4

 

If the dwelling unit is an accessory dwelling unit, this paragraph should not be construed to waive any requirement under § 21-5.720.

(E)   The conversion or alteration of a wet bar, laundry room, or bathroom is prohibited unless the conversion or alteration is specifically allowed under a valid building permit.

(F)   The conversion of a portion of a structure that is excluded from the calculation of floor area pursuant to § 21-10.1 to a portion of the structure that is included in the calculation of floor area is prohibited unless the conversion is allowed under a valid building permit and complies with the applicable standards of this subdivision.

(G)   For one-family or two-family detached dwellings or duplexes constructed pursuant to building permits applied for after May 1, 2019, the impervious surface area of a zoning lot must not exceed 75 percent of the total zoning lot area.

(H)   If the floor area ratio exceeds 0.6, the following additional standards apply:

(i)   Side and rear yards.

(aa)   In the R-3.5 district, side and rear yards must be at least 8 feet; and

(bb)   In the R-5, R-7.5, R-10, and R-20 districts, side and rear yards must be at least 11 feet.

(ii)   Each dwelling unit in the detached dwelling or duplex must be owner-occupied, and the occupant shall deliver to the department evidence of a real property tax home exemption for the subject property prior to issuance of a temporary certificate of occupancy.

(iii)   Subsequent inspections.

(aa)   Upon the completion of construction and the determination by the department that the detached dwelling or duplex complies with all applicable codes and other laws, conforms to the plans and requirements of the applicable building permit, and is in a condition that is safe and suitable for occupancy, the department may issue a temporary certificate of occupancy that is effective for a period of two years after issuance;

(bb)   During the two-year period that a temporary certificate of occupancy is in effect, the department may, with reasonable notice to the holder of the building permit, conduct periodic inspections of the detached dwelling or duplex to confirm that it is in the same structural form as when the temporary certificate of occupancy was issued; and

(cc)   At the end of the two-year period that a temporary certificate of occupancy is in effect, the department may, upon final inspection, issue a certificate of occupancy for the detached dwelling or duplex and close the building permit.

(Added by Ord. 99-12; Am. Ords. 19-3, 20-43)

Table 21-3.2
Residential Districts Development Standards
Development Standard		District
		R-3.5	R-5	R-7.5	R-10	R-20
Minimum lot area (square feet)	One-family dwelling, detached, and other uses	3,500	5,000	7,500	10,000	20,000
	Two-family dwelling, detached	7,000	7,500	14,000	15,000	25,000
	Duplex	3,500	3,750	7,000	7,500	12,500
Minimum lot width and depth (feet)		30 per duplex unit, 50 for other uses		35 per duplex unit, 65 for other uses	65 for dwellings, 100 for other uses	100
Yards (feet):	Front	10 for dwellings, 30 for other uses
	Side and rear	5 for dwellings1 , 15 for other uses			5 for dwellings1 , 15 for other uses
Maximum building area		50% of the zoning lot
Maximum height (feet)2		25-30
Height setbacks		per § 21-3.70-1(c)
1   For duplex lots, 5 feet for any portion of any structure not located on the common property line; the required side yard is zero feet for that portion of the lot containing the common wall.
2   Heights above the minima of the given range may require height setbacks or may be subject to other requirements. See the appropriate section for the zoning district for additional development standards concerning height.

 

(1990 Code, Ch. 21, Art. 3, § 21-3.70-1) (Added by Ord. 99-12; Am. Ord. 15-41)