(a)
Purpose. The intent of setback averaging is as follows:
(1)
To avoid a monotonous and undifferentiated development pattern along streets by encouraging building designs with varied elevations and volumes;
(2)
To provide greater design flexibility in the treatment of interior and exterior space;
(3)
To achieve functionally improved floor plans; and
(4)
To provide for a setback area equivalent to that which would be achieved without the use of averaging, and to ensure that no setback dimension is reduced to a point where it adversely affects the health, safety, and welfare of the neighborhood.
(b)
Method of calculating average setbacks. Where averaging of setbacks is permitted in a zone, the following rules shall apply in determining the average setback required (see illustration below):
(1)
In residential zones, the averageable width shall equal the lot width excluding required side setbacks and the minimum width of a driveway extending along the side of the building.
(2)
In commercial and other nonresidential zones, the averageable width shall be the same as the building width.
(3)
The average area of the setback shall equal the square footage resulting from multiplying the required average setback of the zone by the averageable width.
(4)
No portion of a setback area exceeding the required average setback dimension by more than six feet shall contribute to the total required area of the average setback.
(5)
No building line shall extend closer than the minimum setback specified for the zone in which it is located.
(6)
Setback areas shall be clear from ground to sky, except for allowable building projections pursuant to Section 10-2.1522.
Case 1: Garage in front; no driveway along side setback (see drawing "A" and example below) | Case 2: Garage in rear; driveway extending along side setback (see drawing "B" and example below) | ||||||||||||
lot width | side yard #1 | side yard #2 | averageable width | lot width | side yard #1 | driveway width | averageable width | ||||||
50′ | – | 5′ | – | 5′ | = | 40′ | 50′ | – | 5′ | – | 11′ | = | 34′ |
averageable width | required average setback | required setback area | averageable width | required average setback | required setback area | ||||||||
40′ | X | 25′ | = | 1,000 Sq. Ft. | 34′ | X | 25′ | = | 850 Sq. Ft. | ||||
For both the front and rear setbacks: | Front setback (for rear setback follow procedure in Case 1): | ||||||||||||
A) Subtract the required side setback dimensions from the total width. B) Multiply the lot width minus the side setbacks by the required average setback. This figure is the number of square feet required for the averaged front or rear setback. | A) Subtract the one required side setback and the minimum driveway width from the total width. The example assumes the minimum driveway width is 11′ (see Article 5 to obtain actual driveway width requirements). B) Multiply the lot width minus the side setback and minus the minimum driveway width by the required average front setback. This figure is the number of square feet required for the averaged front setback. | ||||||||||||
1. | The depth of a setback is measured from property line to the building line (wall). |
2. | Where the building line of the second story extends over (cantilevers) the first story, the second story defines the setback. |
3. | Building setbacks in excess of 6′ 0″ past the required average setback will be credited at 6′ 0″ past the average setback. |
4. | Where a structural support, such as a post for an entry or a deck is present, this support will define the building line. |
5. | No building line shall extend closer than the minimum setback. |
6. | Refer to Section 10-2.1522 relating to permitted architectural projections into required setbacks. |
(Ord. 2756 c.s., eff. January 18, 1996)

