17-4-5 Residential zoning districts R-180, R-144, R-80, R-36, R-16, R-10, R-8, R-7, R-6, R-5, R-4, and R-3

A.   The R-180, R-144, R-80, R-36, R-16, R-10, R-8, R-7, R-6, R-5, R-4, and R-3 residential zones consist primarily of single-family homes, with one dwelling and accessory buildings on an individual lot.

B.   The following development standards apply in the R-180, R-144, R-80, R-36, R-16, R-10, R-8, R-7, R-6, R-5, R-4, and R-3 zones:

   1.   Minimum lot sizes for each zone are determined by the number following the dash multiplied by one thousand square feet. For example, the minimum lot size of the R-180 zoning district is 180,000 square feet.

   2.   Properties are regulated based on their primary use as set forth in the use matrix set forth in section 17-4-2.

   3.   Only one primary use is permitted.

   4.   No accessory buildings may be located within the minimum front setback.

   5.   Lot widths and depths.

      a.   Each lot must have a width-to-depth ratio of between 3.0 and 0.33. Therefore, the average depth of the lot must be at least one-third its average width, and the average width of the lot must be at least one-third its average depth.

      b.   When the ratio set forth in the preceding paragraph provides a lot width or depth less than the minimum lot widths and depths set forth in table 4 (development standards per residential zone), the minimum lot widths and depths set forth in table 4 apply.

   6.   Utilities. All utilities must be undergrounded.

   7.   Table 4 (development standards per residential zone) establishes the site development standards of the residential zones (with the column headings deleting the "R-" portions of the zone designations, and where "B" signifies that the item is governed by minimum building code requirements only):

Table 4. Development standards per residential zone
	Zone R-
Development standard	180	144	80	36	16	10	8	7	6	5	4	3
Minimum lot width (feet)	175	175	120	100	80	70	65	55	50	45	40	35
Minimum lot depth (feet)	275	200	200	100	100	95	90	85	80	77	74	70
Minimum lot boundary setbacks (feet)—
Main building ‡ —
Front	40	40	30	30	20	16	16	16	16	10	10	10
Front-loading garage	40	40	30	30	25	20	20	20	20	20	20	20
Side abutting a street	30	30	30	20	15	10	10	10	10	10	10	10
Side	30	30	30	15	10	5	5Δ	5Δ	5Δ	B	B	B
Rear	50	50	40	30	20	15	15	15	15	10	10	10
Rear and side— covered patio structure open on at least three sides	20	20	20	10	5	5	5Δ	5Δ	5Δ	5Δ	5Δ	5Δ
Accessory building	30	30	30	20	10	5	5Δ	5Δ	5Δ	B	B	B
Minimum building separation (in feet) between—
Principal buildings	20	20	20	20	15	10	10	10	10	B	B	B
Principal and accessory building	10	10	10	10	10	5	5	5	5	B	B	B
Accessory buildings	10	10	10	10	10	5	5	5	5	B	B	B
Maximum building height (feet) —
Main building	35	35	35	30	30	30	30	30	30	30	30	30
Accessory building†	30*	30*	30*	25	25	25	25	25	25	25	25	25
Maximum lot coverage (percent of total lot area)	40	40	40	40	50	50	50	50	50	75	75	75

 

 Corner lots shall be at least five feet wider than the minimum lot width of the zone to permit conformance with the required street side yard requirements and sight visibility triangles.

‡ In subdivisions containing one or more lots 16,000 square feet or smaller, the residential design guidelines allow smaller setbacks in certain situations.

Δ Side setbacks of individual lots in these zones may be reduced so long as the total separation between buildings on adjacent lots is not less than ten feet.

† Accessory building height shall be the lesser of the actual height of the main building or the accessory building height shown here. This does not apply to accessory buildings used for agricultural purposes in the R-180, R-144, and R-80 zones.

* Accessory buildings used for agricultural purposes shall be limited to 50 feet in height.

In subdivisions containing one or more lots 16,000 square feet or smaller, the residential design guidelines allow greater lot coverage in certain situations.

Ordinance 2023.012 amended Table 4 of Section 17-4-5