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FAR Calculator
Village of Mamaroneck FAR Calculator for Single and Two-Family Homes
Please refer to definition and schedule below for more detailed information
Click Here for Zoning Code
  FAR Floor Area
Lot Area:
 



*400 foot garage exemption has been eliminated, garages now count towards FAR.

FLOOR AREA, GROSS

The sum of gross horizontal areas of the several floors of the building or buildings on a lot, measured from the exterior faces of exterior walls or from the center line of party walls separating two buildings. Any interior space with a floor-to-ceiling height in excess of 12 feet shall be counted 1.5 times, except in the M-1 Zone. The following are excluded:

(1)             Any attic space with a floor-to-ceiling height of less than seven feet.

(2)     Cellar and basement areas where the average height of all exposed exterior wall or walls is less than three feet measured from both the existing grade prior to construction and from the proposed finish grade after construction as indicated on the approved plans.

(3)     In connection with uses other than single family and two family homes, any areas or structures devoted only to off-street parking or loading.



§342-27.1 Floor Area Ratio in One Family and One and Two Family Residential Districts
The maximum allowable FAR for lots in the R-20, R-15, R-10, R-7.5 and R-6 One Family Districts and the RF-2 One and Two Family District shall be determined by the following Residential FAR (Floor Area Ratio) Schedule set forth below. To determine the maximum gross floor area permitted for an individual one- or two-family house, the actual lot size shall be multiplied by the FAR listed in, or computed in accordance with, the schedule for the appropriate lot size category.

Residential FAR (Floor Area Ratio) Schedule
Floor Area Ratio (FAR)
Lot Size (sq. ft.)

Maximum FAR
Maximum Gross
Floor Area (sq. ft.)
Less than 5,000
0.53
5,000
0.53
2,350
6,000
0.480
2,700
7,000
0.430
3,010
8,000
0.410
3,280
9,000
0.390
3,510
10,000
0.370
3,700
11,000
0.360
3.960
12,000
0.350
4,200
13,000
0.340
4,420
14,000
0.330
4,620
15,000
0.320
4,800
16,000
0.310
4,960
17,000
0.300
5,100
18,000
0.290
5,220
19,000
0.280
5,320
20,000 or more
0.270
5,400

Each lot size range represents 1 to 999 square feet. FAR must be interpolated for any values that fall between the lot sizes indicated. For example a lot of 12,500 square feet would have a FAR of 0.345.