[Ord. No. 4190, 2-1-2021]
A.
The purpose of this Article is to provide uniform requirements for
measuring dimensional standards and to list any exceptions to the
dimensional standards in this Code.
B.
For the purposes of determining compliance with dimensional standards
of this Code, the following shall apply:
1.
Private streets shall be treated as if they are public rights-of-way.
2.
A structure or unit itself, or a structure or unit taken together
with any unimproved and contiguous common elements, shall constitute
the functional equivalent of a lot in the following circumstances:
a.
Condominium units and buildings.
b.
Townhomes and duplexes when each unit is located on an individual
lot.
c.
Nonresidential structures when each unit or structure is located
on an individual lot.
d.
Principal structures when located on a single lot containing
more than one (1) principal structure.
3.
Where a future right-of-way line is shown on a thoroughfare
plan adopted by the City, St. Charles County, or the Missouri Department
of Transportation, the future right-of-way line shall be used instead
of the existing right-of-way line.
C.
When calculations result in fractions, the following shall apply:
D.
Distances specified in this Code are to be measured as the length
of an imaginary straight line joining those points, unless otherwise
expressly stated.
[Ord. No. 4190, 2-1-2021]
B.
Lot Area Per Dwelling Unit.
1.
Lot area per dwelling unit is the minimum lot area that is required
for each dwelling unit on the property.
C.
Lot Width.
2.
On corner lots, lot width is measured between the side lot line
and the opposite front lot line along the front setback line.
3.
On lots located on a concave curve, lot width is measured between
the side lot lines along a line tangent to the midpoint of the front
setback line.
4.
On lots located on a convex curve, lot width is measured between
the side lot lines along the chord of the front setback line.
5.
On lake lots, the minimum lot width is measured at both the
front setback line and rear setback line.
D.
Lot Width Per Dwelling Unit.
1.
Lot width per dwelling unit is the minimum lot width that is
required for each dwelling unit on the property.
[Ord. No. 4190, 2-1-2021]
A.
Setback.
1.
A setback is the distance between a building, structure, improvement,
or site feature, and any lot line.
2.
Required setbacks shall be unobstructed from ground level to
the sky except as specified in Table 410.130.G, Permitted Setback Projections, or as provided
in this Code.
B.
Setback Line.
1.
A setback line is a line drawn parallel to a lot line at a distance
therefrom equal to the depth of the required setback. (See Figure 410.130.A.)
C.
Front Setback.
1.
A front setback extends across the full width of the front of
a lot, the required depth of which is measured from the front lot
line. (See Figure 410.130.A.)
2.
On corner lots and double-frontage lots each lot line with street
frontage is considered a front lot line and therefore has a required
front setback.
D.
Rear Setback.
1.
A rear setback extends across the full width of the rear of
the lot, the required depth of which is measured from the rear lot
line. (See Figure 410.130.A.)
2.
On corner lots, the lot line opposite the front lot line with
the least amount of frontage is the rear lot line and therefore has
a required rear setback.
3.
On double frontage lots and pie-shaped lots, there is no rear
lot line and therefore no rear setback.
E.
Side Setback.
1.
A side setback extends from the front setback line to the rear
setback line, the required depth of which is measured from the side
lot line. (See Figure 410.130.A.)
2.
Duplex and townhouse dwelling units sharing a common wall shall
not be required to comply with side setback requirements except for
the outside walls of the end units.
F.
Building Separation.
1.
Building separation is the required minimum distance between
the nearest portions of any principal structures on a single lot.
G.
Exceptions.
1.
The features listed in Table 410.130.G, Permitted Setback Projections, shall be permitted
to project into the required setbacks of the applicable zoning district.
The exceptions apply to all zoning districts unless otherwise stated.
2.
When a feature is not listed in Table
410.130.G, Permitted Setback Projections,
the feature may not be located in a yard or project into the required
setbacks unless the Community Development Director determines that
the feature is reasonably comparable to a feature that is already
listed.
3.
Projections shall not extend or encroach into a public or private easement or right-of-way, except as permitted in Section 510.010, Obstruction on Streets and Sidewalks - Easement Encroachment - Exceptions, of the Municipal Code, nor obscure a required visual clearance area as described in Section 425.080, Visibility at Intersections.
4.
The standards listed in Table 410.130.G, Permitted Setback Projections, may be waived or
modified through one of the following procedures, except where an
alternative procedure is specified in this Article:
c.
Table 410.130.G
Permitted Setback Projections
| |||||||||||||||
---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
Front
|
Side
|
Rear
| |||||||||||||
Permitted Encroachment
|
Attached or Freestanding
|
Covered or Uncovered
|
Enclosed or Unenclosed
|
Permitted in Yard
|
Permitted in Setback
|
Maximum Setback Encroachment
|
Minimum Setback
|
Permitted in Yard
|
Permitted in Setback
|
Maximum Setback Encroachment
|
Minimum Setback
|
Permitted in Yard
|
Permitted in Setback
|
Maximum Setback Encroachment
|
Minimum Setback
|
Agricultural structures
|
Freestanding
|
Covered
|
Enclosed
|
Yes
|
No
|
—
|
—
|
Yes
|
No
|
—
|
—
|
Yes
|
No
|
—
|
—
|
Architectural features
|
Attached
|
—
|
—
|
Yes
|
Yes
|
2 feet
|
None
|
Yes
|
Yes
|
2 feet
|
None
|
Yes
|
Yes
|
2 feet
|
None
|
Awnings and canopies
|
Attached
|
—
|
—
|
Yes
|
Yes
|
None
|
None
|
Yes
|
Yes
|
None
|
None
|
Yes
|
Yes
|
None
|
None
|
Balconies
|
Attached
|
Covered or uncovered
|
Unenclosed
|
Yes
|
Yes
|
6 feet
|
None
|
Yes
|
No
|
—
|
—
|
Yes
|
No
|
—
|
—
|
Basketball goals
|
Freestanding
|
—
|
—
|
Yes
|
Yes
|
None
|
10 feet from edge of pavement or back of curb
|
Yes
|
No
|
—
|
—
|
Yes
|
No
|
—
|
—
|
Boat docks
|
Freestanding
|
—
|
—
|
Yes
|
Yes
|
None
|
None
|
Yes
|
Yes
|
None
|
None
|
Yes
|
Yes
|
None
|
None
|
Decks
|
Attached or freestanding
|
Uncovered
|
Unenclosed
|
No
|
No
|
—
|
—
|
Yes
|
Yes
|
1/2 of the required setback
|
None
|
Yes
|
Yes
|
1/2 of the required setback
|
None
|
Decorative fences or walls (less than 18 inches), retaining
walls
|
Freestanding
|
—
|
—
|
Yes
|
Yes
|
None
|
None
|
Yes
|
Yes
|
None
|
None
|
Yes
|
Yes
|
None
|
None
|
Donation collection bins
|
Freestanding
|
—
|
—
|
Yes
|
No
|
—
|
—
|
Yes
|
No
|
—
|
—
|
Yes
|
No
|
—
|
—
|
Fences (Refer to Section 425.110, Fences.)
|
Freestanding
|
—
|
—
|
—
|
—
|
—
|
—
|
—
|
—
|
—
|
—
|
—
|
—
|
—
|
—
|
Flagpoles
|
Freestanding
|
—
|
—
|
Yes
|
Yes
|
1/2 of the required setback
|
None
|
Yes
|
Yes
|
1/2 of the required setback
|
None
|
Yes
|
Yes
|
1/2 of the required setback
|
None
|
Gasoline station canopies, multi-pump dispensers, and service islands (Refer to Section 420.090(A), Gasoline Stations.)
|
Attached or freestanding
|
—
|
—
|
—
|
—
|
—
|
—
|
—
|
—
|
—
|
—
|
—
|
—
|
—
|
—
|
Gazebos
|
Freestanding
|
Covered
|
Unenclosed
|
No
|
No
|
—
|
—
|
Yes
|
Yes
|
1/2 of the required setback
|
None
|
Yes
|
Yes
|
1/2 of the required setback
|
None
|
Mechanical equipment
|
Attached or freestanding
|
—
|
—
|
No
|
No
|
—
|
—
|
Yes
|
Yes
|
3 feet
|
None
|
Yes
|
Yes
|
1/2 of the required setback
|
None
|
Outdoor dining, outdoor display and sales
|
Freestanding
|
—
|
—
|
Yes
|
Yes
|
None
|
None
|
Yes
|
Yes
|
None
|
None
|
Yes
|
Yes
|
None
|
None
|
Parking spaces
|
Freestanding
|
—
|
—
|
Yes
|
Yes
|
None
|
10 feet
|
Yes
|
Yes
|
None
|
10 feet
|
Yes
|
Yes
|
None
|
10 feet
|
Patios and terraces
|
Attached or freestanding
|
Uncovered
|
Unenclosed
|
Yes
|
Yes
|
6 feet
|
None
|
Yes
|
Yes
|
None
|
None
|
Yes
|
Yes
|
None
|
None
|
Pergolas and arbors
|
Attached or freestanding
|
Covered
|
Unenclosed
|
No
|
No
|
—
|
—
|
Yes
|
Yes
|
1/2 of the required setback
|
None
|
Yes
|
Yes
|
1/2 of the required setback
|
None
|
Play equipment and recreational courts (outdoor)
|
Freestanding
|
—
|
—
|
No
|
No
|
—
|
—
|
Yes
|
Yes
|
1/2 of the required setback
|
None
|
Yes
|
Yes
|
1/2 of the required setback
|
None
|
Porches and porte cocheres
|
Attached
|
Covered
|
Unenclosed
|
Yes
|
Yes
|
6 feet
|
None
|
Yes
|
No
|
—
|
—
|
Yes
|
No
|
—
|
—
|
Steps, railings, and accessibility ramps
|
Attached or freestanding
|
Uncovered
|
Unenclosed
|
Yes
|
Yes
|
None
|
None
|
Yes
|
Yes
|
None
|
None
|
Yes
|
Yes
|
None
|
None
|
Swimming pools (outdoor)
|
Freestanding
|
—
|
—
|
No
|
No
|
—
|
—
|
Yes
|
Yes
|
1/2 of the required setback (pool apron)
|
15 feet (pool lip or edge)
|
Yes
|
Yes
|
1/2 of the required setback (pool apron)
|
15 feet (pool lip or edge)
|
Trash enclosures (detached houses, duplexes and townhouses)
|
Attached or freestanding
|
Uncovered
|
Unenclosed
|
Yes
|
No
|
—
|
—
|
Yes
|
Yes
|
1/2 of the required setback
|
None
|
Yes
|
No
|
—
|
—
|
Trash enclosures (multi-unit, mixed-use and nonresidential uses)
|
Attached or freestanding
|
Uncovered
|
Unenclosed
|
Yes
|
Yes
|
10 feet
|
None
|
Yes
|
Yes
|
None
|
10 feet
|
Yes
|
Yes
|
None
|
10 feet
|
Trellises
|
Freestanding
|
—
|
—
|
Yes
|
Yes
|
None
|
None
|
Yes
|
Yes
|
None
|
None
|
Yes
|
Yes
|
None
|
None
|
Vestibules
|
Attached
|
Covered
|
Enclosed
|
Yes
|
Yes
|
2 feet
|
None
|
Yes
|
Yes
|
2 feet
|
None
|
Yes
|
Yes
|
2 feet
|
None
|
Wall cladding
|
Attached
|
—
|
—
|
Yes
|
Yes
|
5 inches
|
None
|
Yes
|
Yes
|
5 inches
|
None
|
Yes
|
Yes
|
5 inches
|
None
|
[Ord. No. 4190, 2-1-2021]
A.
Height.
1.
For buildings, height is the vertical distance above finished
grade at the front of the building measured to the highest point of
a flat or mansard roof, or to the midpoint of the highest gable of
a pitched or hipped roof. (See Figure 410.140.A.)
2.
For other structures, height is the vertical distance above
finished grade of the base of the structure measured to the highest
point, including the main structure and all the attachments thereto.
3.
Exceptions.
a.
The following structures and features shall be permitted to
project beyond the maximum height requirements of the applicable zoning
district:
(1)
Agricultural structures.
(2)
Architectural features, such as spires, belfries,
parapet walls, cupolas, domes, flues and chimneys.
(3)
Structures such as elevator penthouses, gas tanks,
grain elevators, radio, roof-mounted mechanical equipment, cooling
towers, fire towers, and smoke stacks.
(4)
Structures related to utility services, such as
water towers, electric power and communication transmission lines,
traffic signals, and light poles.
(5)
Wireless facilities and wireless support structures, in accordance with Section 420.110(A), Wireless Communications.
B.
Floor Area Ratio.
1.
Floor area ratio is the total gross floor area of the building
or buildings on any lot divided by the total lot area.
C.
Gross Floor Area.
1.
Gross floor area is the sum of the gross area of every story
of a building measured from the exterior limits of the faces of the
structure, excluding unfinished basements, garages, porches, attics,
parking structures and parking areas.
D.
Lot Coverage.
1.
Lot coverage is the total area of a lot occupied by buildings,
structures, and impervious surfaces, expressed as a percentage of
the total lot area.
E.
Net Density.
1.
Net density is the number of dwelling units permitted per acre
of land, excluding land dedicated for street right-of-way, floodways,
retention and detention basins, areas which exceed slopes of three
to one (3:1), access easements, and land cut off from the main parcel
by a road, railroad or major stream such that common use is hindered
or that the land is unavailable for building purposes.