No accessory building shall hereinafter be located, erected, moved, reconstructed, extended, enlarged, converted or structurally altered without a zoning permit from the Planning and Development Department and without being in conformity with the provisions of this chapter and state statutes and the Wisconsin Administrative Code. The accessory building shall also meet all the structural requirements of local and state codes.
Accessory buildings may be located in all districts except the C-1 Lowland Resource Conservancy District.
A. 
All drawings and plans for the construction, installation, enlargement or alteration of any such accessory building shall first be presented to the Planning and Development Department for examination and approval as to proper size, location and construction.
B. 
All such plans and drawings shall be drawn to scale and shall indicate thereon all distances and dimensions so as to accurately and explicitly show all lot lines and all information pertaining to the accessory building. Such plans shall also include vertical elevations of the accessory building.
A. 
Agricultural buildings, on lots of at least 10 acres, such as barns, silos, bins, sheds and farm machinery sheds in the A-1, A-2, A-3 and A-4 Agricultural Districts shall not be considered accessory buildings. Such buildings are principal agricultural buildings and shall comply with the yard and height requirement of the agricultural districts.
B. 
Buildings on nonconforming lots in the A-1, A-2, A-3 and A-4 Districts less than 10 acres shall be considered accessory buildings and shall comply with the provisions of this article.
Accessory buildings shall be detached from the principal structure, provided that the accessory building:
A. 
Is on the same lot and then permitted only after the principal structure is present or under construction.
B. 
Shall be located in the side or rear yard only. In the case of a double frontage lot or corner lot, accessory buildings may be located in the secondary street yard of the premises so long as the required minimum street yard setback is maintained.
Accessory building size is based upon lot size according to § 490-19.12.
Accessory buildings shall have the following setbacks (see § 490-19.12):
A. 
A building separation of at least 10 feet between all buildings and structures.
B. 
A minimum five-foot side and rear yard setback on lots equal to or less than 39,999 square feet, unless zoned R-9, R-10 or R-11, in which case the setback shall be 10 feet.
C. 
A minimum ten-foot side and rear yard setback on lots equal to or greater than 40,000 square feet.
D. 
Detached accessory buildings in all other districts shall meet the minimum setback requirements as outlined in each district.
E. 
Detached accessory buildings shall not be closer than 10 feet to an alley right-of-way.
Accessory buildings shall have the following height (see § 490-19.12):
A. 
A maximum height of 12 feet for buildings (shed, gazebo, pool house) equal to or less than 150 square feet.
B. 
A maximum height of 17 feet for buildings greater than 150 square feet and equal to or less than 720 square feet.
C. 
A maximum height of 20 feet for buildings greater than 720 square feet.
D. 
A maximum height of 24 feet for buildings greater than 3,000 square feet.
The number of accessory buildings permitted per lot is as follows: (see § 490-19.12):
A. 
One of each: shed, gazebo, pool house equal to or less than 150 square feet.
B. 
One accessory building greater than 150 square feet on lots equal to or less than 79,999 square feet.
C. 
Two accessory buildings greater than 150 square feet on lots equal to or greater than 80,000 square feet.
D. 
If the total number of detached accessory buildings existing on a parcel exceeds the total number permitted in the district, no additional buildings or additions to existing buildings shall be permitted unless buildings in excess of the district standard are removed.
Open-sided and/or screened structures (buildings) such as gazebos and screen houses are permitted in the shoreyard setback area, provided that the following is satisfied in accordance with § 59.692(1v), Wis. Stats.:
A. 
The part of the structure (building) that is nearest to the water is located at least 35 feet landward from the ordinary high-water mark.
B. 
The floor area of all structures (buildings) in the shoreland setback area shall not exceed 200 square feet.
C. 
The structure (building) has no sides or has open or screened sides.
D. 
The structure (building) shall not exceed 10 feet in height.
E. 
Submittal of a plan, approved by the Planning and Development Department, that will be implemented by the owner of the property to preserve or establish a vegetative shoreland buffer area that covers at least 70% of the width at least 37.5 feet landward from the ordinary high-water mark.
F. 
Shoreland buffer area shall be established and maintained with applicable shoreland cutting provisions of § 490-15.2.
Boathouses accessory to permitted uses may be located within a shore yard and entirely within the access and viewing corridor, but shall not be closer to a lake, stream, pond, or wetland than the ordinary high-water mark.
A. 
A boathouse is a nonhabitable structure and shall be designed and used exclusively for marine equipment and shall meet the following requirements:
(1) 
Used by the owner or occupant of the parcel.
(2) 
One boathouse per shoreland lot.
(3) 
Not to be closer than three feet to any side lot line, and the boathouse shall be constructed in such manner as to orient the main opening of the boathouse toward the lake.
(4) 
Not to exceed 450 square feet measured outside wall to outside wall.
(5) 
Not to exceed one story, with a maximum wall height of 10 feet.
(6) 
Maximum height of 12 feet above the existing shoreline grade except when bluff and/or steep slope conditions exist (in such cases, it shall not exceed the height of the top grade elevation of said shoreland lot).
(7) 
Maximum width parallel to the shore of 15 feet.
(8) 
Not to contain fireplaces, patio doors, plumbing, heating, air conditioning, cooking facilities or other features inconsistent with the use of the structure exclusively as a boathouse.
(9) 
No attached or detached decks or patios.
(10) 
Maximum of 10 square feet of window surface may be allowed on each side.
(11) 
No more than one service door not to exceed 36 inches in width. The service door shall not be on the water body side of the structure.
(12) 
No more than one garage-style access door not exceeding 10 feet in width and no less than 8 feet in width. The garage-style door shall be on the water body side of the structure.
B. 
The roof of a boathouse may be used as a deck, provided that:
(1) 
The boathouse has a flat roof.
(2) 
The roof has no side walls or screens.
(3) 
The roof may have a railing that meets the Department of Safety and Professional Services standards.
Lot Area
Maximum Number of Buildings
Maximum Size
(square feet)
Maximum Height
(feet)
Yard Location
Side/Rear Setback
Less than 15,000 square feet
1
1
150
720
12
17
Side or rear
Side or rear
5 feet
5 feet
15,000 to 19,999 square feet
1
1
150
1,000
12
20
Side or rear
Side or rear
5 feet
5 feet
20,000 to 39,999 square feet
1
1
150
1,500
12
20
Side or rear
Side or rear
5 feet
5 feet
40,000 to 79,999 square feet
1
1
150
2,000
12
20
Side or rear
Side or rear
10 feet
10 feet
80,000 to 119,999 square feet
1
2
150
2,500
12
20
Side or rear
Side or rear
10 feet
10 feet
120,000 to 159,999 square feet
1
2
150
3,000
12
20
Side or rear
Side or rear
10 feet
10 feet
160,000 square feet to 4.9 acres
1
2
150
3,500
12
20
Side or rear
Side or rear
10 feet
10 feet
5 to 5.9 acres
1
2
150
4,000
12
20
Side or rear
Side, rear
10 feet
10 feet
6 to 6.9 acres
1
2
150
4,500
12
20
Side or rear
Side, rear
10 feet
10 feet
7 to 7.9 acres
1
2
150
5,000
12
20
Side or rear
Side, rear
10 feet
10 feet
8 to 8.9 acres
1
2
150
5,500
12
20
Side or rear
Side, rear
10 feet
10 feet
9 to 9.9 acres
1
2
150
6,000
12
20
Side or rear
Side, rear
10 feet
10 feet
More than 10 acres
C-2
No limit
No limit
24
Side, rear street
25 feet
50 feet
R-9
No limit
No limit
20
Side or rear
25 feet
50 feet
R-10
No limit
No limit
20
Side or rear
25 feet
50 feet
R-11
No limit
No limit
20
Side or rear
25 feet
50 feet
R-12
1
1
150
720
12
17
Side or rear
Side or rear
5 feet
5 feet