A. 
In all use districts no dwelling shall hereafter be erected or altered for one-family dwelling use unless provision shall be made therein for not less than 1,200 square feet as the minimum floor area for a single-family dwelling, exclusive of attached garages, carports, open porches and open breezeways. The computation of floor area shall be as follows:
(1) 
One-story residence, all rooms on one level: a minimum of 1,200 square feet.
(2) 
One-story residence with expansion attic. A maximum of 136 square feet of the floor area of the secondary story may be used and applied to the floor area requirements of the dwelling unit. To qualify as floor area, the second floor shall have:
(a) 
Rough flooring installed.
(b) 
A minimum ceiling height of seven feet.
(c) 
Walls or knee walls of not less than four feet in height between which the floor area shall be computed.
(d) 
Access from the floor below by a permanent built-in stairway.
(e) 
At least one window in each gable end.
(3) 
Two-story residence where both floors have a minimum ceiling height of eight feet: a maximum of 500 square feet of the floor area of the second story may be used and applied to the floor area requirements of the dwelling unit.
(4) 
Raised ranch where both floors have a minimum ceiling height of eight feet: a maximum of 200 square feet of the floor area of the lower level may be used and applied to the floor area requirements of the dwelling unit. To qualify as floor area, the lower level shall:
(a) 
Have more than half of its height, measured from floor to ceiling, above the average established curb level or finished grade of the ground adjoining the building.
(b) 
Be completely enclosed by ceilings and sidewalls which have been properly finished with approved construction materials.
(c) 
Have a floor finished with approved construction materials, excluding, however, paint.
(5) 
Split-level where the two height levels are completely above finished grade, with minimum ceilings of eight feet: a maximum of 250 square feet of the floor area of the lowest level may be used and applied to the floor area requirements of the dwelling unit. To qualify as floor area, the lowest level shall meet the same standards as those applied to raised ranch homes, as noted in Subsection A(4) above.
B. 
This chapter shall not apply to or in any way affect the minimum habitable area of dwellings erected upon lots shown on a final subdivision plat which has been approved by the Planning Board of the Town of Brookhaven prior to January 1, 1969, provided that the required performance bonds and fees have been filed with and paid to the Planning Board prior to January 1, 1969.
C. 
No residential dwelling shall be occupied or used as a rooming or boarding house, nor shall any one-family dwelling be used for more than one family.