MAXIMUM IMPERVIOUS SURFACE
&
MAXIMUM BUILDING COVERAGE CALCULATION SHEET
All permit application for building additions, sheds, pools or other accessory structures must be
accompanied by a plot plan indicating all structures and impervious surfaces that exist on the property
including the proposed new addition.
In order to accurately calculate the impervious coverage for your particular project you need to know
the Zoning Classification for the property. There are varying percentages used depending on the
district. The calculation shown below is only an example depicting the process used for determining
impervious coverage.
Please complete the following, where applicable.
A. Lot Area
B. Square footage of house, including additions.
C. Square footage of carport/garage.
D. Square footage of pool.
E. Square footage of shed or detached garage.
F. Square footage of deck or covered porch.
G. Square footage of proposed addition.
H.
TOTAL SQUARE FOOTAGE OF BUILDING
(A+B+C+D+E+F)
I. Square footage of driveway.
J. Square footage of sidewalk (including around pools)
K. Square footage of patio.
L.
TOTAL SQUARE FOOTAGE OF IMPERVIOUS COVERAGE
(G+H+I+J – C)
EXAMPLE CALCULATION:
To compute the maximum square footage of building coverage allowed on a lot, multiply 0.35 X the
total square footage of the lot. (example: A lot measuring 7200 SQ. FT. would have a maximum
allowable building coverage of 2,520 SQ. FT.)
To compute the maximum square footage of impervious surface allowed on a lot, multiply 0.40 X the
total square footage of the lot. (example: A lot measuring 7200 SQ. FT> would have a maximum
allowable impervious surface of 2880 SQ. FT.
BENSALEM TOWNSHIP
Building and Planning Department
2400 Byberry Road ▪ Bensalem PA 19020
215-633-3644 ▪ FAX 215-633-3653
