Every principal structure or building hereafter
erected shall be located on a lot as herein defined, and in no case
shall there be more than one principal building on one lot, except
for:
A. Planned unit developments.
B. Multiunit buildings and institutional buildings developed
as a group.
[Amended 3-21-2023 by Ord. No. A-561]
C. Industrial and commercial buildings where it can be
demonstrated to the satisfaction of the Zoning Administrator that
any principal building can be subsequently detached with a lot and
yards conforming to the requirements of this chapter.
Accessory uses may be allowed where they comply
with the following conditions and requirements:
A. Size of accessory structures in residential districts.
Accessory structures in residential districts may not occupy more
than 25% of a required rear yard or 35% of any nonrequired rear yard.
In no instance shall the accessory structure exceed the ground floor
area of the main building used for residence. The measurement of accessory
structure size shall include the total of all detached or attached
accessory buildings on the lot. The total area of accessory structures
on a single lot in residential districts shall not exceed 1,000 square
feet in area, except when issued a conditional use permit under the
terms and conditions of this chapter.
B. Separation from principal structures. Detached accessory
buildings shall be distant at least 10 feet from the principal structure
situated on the same lot, unless applicable building code requirements
for 3/4-hour fire-rated construction is met. See Wisconsin Construction
Standards, Table 321.08.
[Amended 3-21-2023 by Ord. No. A-561]
C. Accessory structures in front yards limited. No attached
or detached accessory use or accessory structure shall be permitted
nearer to the front lot line than the legal front yard setback in
the zoning district for the principal structure or the average setback
of the principal structures on lots immediately adjoining the lot
on the same side of the street, whichever distance is less. In no
case may an accessory structure be located closer to a front lot line
than the principal structure.
D. Accessory structure side and rear setbacks. All accessory
structures shall be set back at least three feet from all interior
lot lines. In those instances where the rear lot line is coterminous
with an alley right-of-way, the accessory building shall not be closer
than 20 feet to such rear lot line.
E. Accessory structure setbacks on corner lots. The average setback of the four, or fewer, nearest buildings may be used to determine the side street setback of an accessory building on a corner lot, but in no case shall the reduced setback be less than 20 feet. In no case may an accessory structure be located within the vision triangle as defined in §
340-19 of this chapter.
F. Accessory structure height. No accessory structure
shall exceed 20 feet in height. "Height" for this purpose shall mean
the vertical distance between the lowest aboveground point of the
front of the structure and the peak of the roof. A cupola, no side
of which exceeds three feet in length, and which does not extend more
than four feet above the peak of the roof, shall not be included in
measuring height. Any other cupola shall be included in the height
measurement. Chimneys shall not be included in measuring height.
G. Accessory structures attached to principal buildings.
When an accessory building is structurally attached to a main building,
it shall be subject to, and must conform to, all regulations of this
chapter applicable to main buildings, including all yard setbacks.
If after initial construction any detached accessory building is attached
to the principal building, the newly attached accessory structure
must meet all of the applicable yard setbacks for the principal structure.
H. Conversion of accessory structures to dwellings limited.
The conversion of any accessory structure into a dwelling or the conversion
of any dwelling so as to accommodate an increased number of dwelling
units or families shall be permitted only within a district in which
a new building for similar occupancy would be permitted under this
chapter, and only when the resulting occupancy will comply with the
requirements governing new construction in such district, with respect
to minimum lot size, lot area per dwelling unit, percentage of lot
coverage, dimensions of yards and other open spaces, and off-street
parking.
I. Accessory structures without principal structure.
No accessory structure shall be erected or constructed prior to the
erection or construction of the principal structure.
Building construction trailers, equipment, and
materials used in conjunction with construction work shall be removed
upon completion of such construction work and issuance of a certificate
of occupancy.
No person in control of property shall allow
a tree or shrub to be placed or grow or an accessory structure to
be located and constructed so as to cast a shadow between the hours
of 9:00 a.m. and 3:00 p.m. upon a solar collector energy system capable
of generating more than 1,000,000 British thermal units per year and
that supplies a part of the energy requirements for improvements on
the property where the solar energy system is permanently located.
The provisions of this section shall not require the removal of existing
vegetation or existing accessory structures.