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Jefferson County, MO
 
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Table of Contents
Table of Contents
[Zoning Order §8.040, 4-2-2008]
A day care/elder care home is a permitted accessory use in a residential structure occupied by a person who cares for not more than four (4) persons for any part of a twenty-four (24) hour period. Care for more than four (4), but not more than ten (10) persons, shall require a conditional use permit as specified in Article IX.
[Zoning Order §8.050, 4-2-2008; Ord. No. 07-30-2008A §§1 — 2(8.050.A.1), 7-30-2008; Ord. No. 11-12-2008A §§1 — 2(8.050), 11-12-2008; Resolution 1-14-2010A Exh. A, 1-14-2010; Ord. No. 10-0145 §§1 — 2, 2-18-2010]
A. 
In residential districts, the following restrictions and standards shall apply to all fences and masonry walls:
1. 
Front yard. A fence or masonry wall constructed within the front yard setback shall not exceed four (4) feet in height in the "R-40", "R-20", "R-10" and "R-7" zone districts. In the "RA-5" Rural/Agricultural and "LR-2" Large Lot Residential Districts, however, such fence may be increased to eight (8) feet maximum height, if the fencing material is at a ratio of two-thirds (2/3) open space to one-third (1/3) closed space (e.g., picket and split rail fence) per square foot for that part of the fence that exceeds the four (4) feet height limit.
2. 
Rear yard. A fence or masonry wall up to eight (8) feet in height may be constructed on the rear property line on all lots whose rear lot lines abut another lot or a designated thoroughfare. However, no fence shall be permitted in any required landscape area, except as approved by the County.
3. 
Side yard. A fence or masonry wall up to eight (8) feet in height may be constructed on the side property line, except that no fence or masonry wall over four (4) feet in height shall be in front of the front setback line on a corner lot. A fence or masonry wall on the side property line under this Subsection may be constructed to match a fence or masonry wall allowed by or located in Subsection (A)(1) above. In addition, no fence shall be permitted in any required landscape area, except as a part of an approved development plan.
B. 
In all commercial and industrial districts, a fence or wall may be constructed on any side or rear property line, but shall not be located in any required front yard setback or be closer to any public or private street than the required setback for a building, except per approved development plan.
[Zoning Order §8.060, 4-2-2008; Ord. No. 07-30-2008A §§1 — 2(8.060), 7-30-2008]
A. 
In the "RA-5" Rural/Agricultural and "LR-2" Large Lot Residential Districts, there shall be permitted accessory buildings, combined square footage of which shall not exceed a total of four thousand (4,000) square feet or five percent (5%) of the lot area that is not occupied by the primary use, whichever is most permissive. Accessory buildings shall comply with Section 400.2770. On a lot where the primary building has not been constructed, the total square footage of all accessory structures shall not exceed four thousand (4,000) square feet.
B. 
In the "R-40", "R-20", "R-10" and "R-7" residential zoning districts, accessory buildings shall not exceed a total of twelve hundred (1,200) square feet or five percent (5%) of the lot area that is not occupied by the primary use, whichever is most permissive. Accessory buildings shall comply with Section 400.2770. On a lot where the primary building has not been constructed, the total square footage of all accessory buildings shall not exceed twelve hundred (1,200) square feet.
C. 
Accessory buildings that are two hundred (200) square feet or less shall be set back at least fifteen (15) feet from the rear property line.
[Zoning Order §8.070, 4-2-2008]
In the "R-20", "R-10" and "R-7" residential districts a greenhouse may not exceed twenty-five percent (25%) of the ground floor area of the residential structure it serves. All plants grown in the greenhouse shall be only for private, non-retail or wholesale use. In the "RA-5" and "LR-2" residential districts, a greenhouse shall be treated as an accessory structure as provided in Section 400.2870.
[Zoning Order §8.080, 4-2-2008]
A. 
Home occupations shall be permitted as an accessory use in residential dwellings and accessory structures conforming to this UDO in any district, subject to the following provisions:
1. 
Purpose and intent. It is the purpose and intent of these requirements to:
a. 
Maintain neighborhood integrity and preserve the residential character of neighborhoods by encouraging compatible land uses;
b. 
Provide residents of the County with an option to utilize their residences as places to enhance or fulfill personal economic goals, as long as the choice of home occupations does not infringe on the residential rights of neighbors;
c. 
Establish criteria for operating home occupations in dwelling units and accessory structures; and
d. 
Ensure that public and private services, such as streets, sewers, water or utility systems, are not burdened by home occupations to the extent that usage significantly exceeds that which is normally associated with a residence.
2. 
General provisions.
a. 
Home occupations shall be permitted as accessory uses within principal residential dwellings and accessory structures, conforming to this UDO, in any residential district; provided that they meet the following conditions and all requirements of the district in which they are located:
(1) 
The home occupation must be clearly incidental and secondary to the primary residential use of the dwelling;
(2) 
The home occupation must not change the outside appearance of the dwelling(s);
(3) 
Exterior signage for a home occupation shall be in accordance with Article XIII;
(4) 
The home occupation must not generate traffic, parking, sewage or water use in excess of what is normal or customary in a residential neighborhood;
(5) 
The home occupation shall not create a hazard to person or property, result in electrical interference or become a nuisance;
(6) 
No outside storage of any kind related to the home occupation shall be permitted;
(7) 
No persons other than self or family members residing on the premises, plus one (1) additional person not residing on the premises, shall be employed or involved in any business activity related to the home occupation on the premises;
(8) 
No more than thirty-three percent (33%) of the gross floor area of the dwelling unit shall be used for the operation of the home occupation inside the residential dwelling or accessory structure;
(9) 
Deliveries of materials to and from the premises in conjunction with the home occupation shall not require the use of vehicles other than parcel post or similar parcel service vehicles;
(10) 
Noise, vibration, smoke, odors, heat or glare, as a result of a home occupation, which would exceed that normally produced by a single residence, shall not be permitted;
(11) 
The lot upon which the home occupation is operated shall not be utilized to park or maintain more than two (2) private commercial single-axle vehicles not to exceed a one (1) ton rating;
(12) 
Home occupations shall maintain required licenses and permits mandated by applicable County, State and/or Federal laws;
(13) 
Persons intending to operate a home occupation should notify their applicable Home Owners Association ("HOA"), if one exists, of their intent prior to beginning operations; said notification is to provide the HOA with notice of intent only.
b. 
Permitted home occupations. Home occupations shall be approved by the Director upon his/her determination that the requirements of this UDO can be satisfied. In the event a home occupation is denied by the Director, the reasons for the denial shall be given to the applicant in writing. This decision for denial may be appealed to the Planning and Zoning Commission within fourteen (14) days of the date of the letter from the Director.
B. 
Any proposed home occupation not specifically permitted in Table 5-1 of Article V, Zoning Districts, of this UDO shall be prohibited.
[Zoning Order §8.090, 4-2-2008; Resolution 1-14-2010A Exh. A, 1-14-2010; Ord. No. 10-0145 §§1 — 2, 2-18-2010]
A. 
A kennel with outside runs as an accessory use to a veterinarian clinic/hospital shall be located at least one hundred (100) feet from any property zoned or used for residential purposes.
B. 
A kennel facility and outdoor runs on residentially zoned property shall not encroach within the building setback areas of the zone lot.
[Zoning Order §8.100, 4-2-2008; Ord. No. 07-30-2008A §§1 — 2(8.100 C), 7-30-2008]
A. 
A single loft dwelling unit above a detached garage is permitted as an accessory use to a permitted residential use provided:
1. 
Additional parking is provided on site to accommodate the separate dwelling unit, other than the driveway for the principal structure;
2. 
Building codes can be met as they relate to the separation requirements between the garage and the residential dwelling unit(s); and
3. 
Loft dwelling units above a detached garage are prohibited in the "R-10" and "R-7" zone district(s).
[Zoning Order §8.110, 4-2-2008]
A. 
Outside storage of vehicles, motor homes, equipment, materials, boats or personal watercraft, etc., whether in open or enclosed yards, shall stay behind the front building line and shall meet the following conditions:
1. 
The outside storage shall be located on land owned by, leased by or under the control of the users;
2. 
All storage areas and access drives shall be paved (includes pervious pavement), rocked or constructed with crushed stone; and
3. 
Outside storage of inoperative vehicles or equipment (no more than two (2) shall comply with all other County codes and regulations. Inoperative vehicles or equipment shall be stored in an enclosed, sight-proof area or covered with a fitted vehicle cover (not a tarp).
[Zoning Order §8.120, 4-2-2008; Ord. No. 07-30-2008A §§1 — 2(8.120), 7-30-2008]
A. 
Windmills for power generation incidental to any permitted residential or agricultural uses may be located in an "RA-5", "LR-2" or "R-40" zone district.
B. 
Windmills shall comply with the building setbacks and height limitations of the zone district in which located.
C. 
Windmills shall comply with the Building Code.
D. 
Windmills shall comply with all other applicable local, State and Federal regulations.