In expansion of the declaration of legislative intent and community development objectives contained in Article I of this chapter, the specific intent of this district is:
A. 
To preserve and build upon the strength of the Lower Frederick's villages as the core of the Township, both in terms of uses and densities/intensities of those uses.
B. 
To provide for the Township's fair share of population growth, by permitting medium-density development and a variety of detached and semidetached dwelling types.
C. 
To provide standards that permit orderly and efficient medium-density development while preserving and protecting adjacent areas from any negative impacts.
D. 
To promote the sense of neighborhood and promote community identity.
E. 
To encourage walking between buildings, and encourage automobile trips that serve more than one purpose, thereby reducing traffic volume.
F. 
To provide open space and recreation facilities for the benefit of residents of medium-density developments.
G. 
To further the general welfare by extending greater opportunities for better and more affordable housing to present and prospective residents of Lower Frederick Township.
H. 
To promote the objectives and policies of the Township Comprehensive Plan.
In the R-3 Medium-Density Residential District, a building may be erected, altered or used, and a lot may be used or occupied, for any of the following uses and no other:
A. 
Any mix of the following residential dwelling types with density based on the standards listed below. Maximum tract density shall be subject to further modification by the environmental adjustment factors in § 170-41 of this chapter, as determined by the formula in § 170-41B(2) of this chapter.
(1) 
Single-family detached dwelling: three dwelling units per acre.
(2) 
Lot line house dwelling: four dwelling units per acre.
(3) 
Village house dwelling: four dwelling units per acre.
(4) 
Patio house dwelling: four dwelling units per acre.
(5) 
Single-family semidetached dwelling: four dwelling units per acre.
(6) 
Two-family detached dwelling: four dwelling units per acre.
B. 
Open space uses, primarily passive in nature, including wildlife sanctuary, forest preserve, nature center, and similar uses.
C. 
Game farm, fish hatchery, hunting or fishing preserve; or similar uses designed for the protection or propagation of wildlife.
D. 
Parks and recreation areas in compliance with the standards and criteria of Article XIII, Institutional and Recreational Overlay District, when approved by the Board of Supervisors.
E. 
Institutions, by conditional use and in compliance with the standards and criteria of Article XIII, Institutional and Recreational Overlay District, when approved by the Board of Supervisors.
F. 
Government uses, public utility facility.
G. 
Accessory uses in compliance with § 170-24 of this chapter, including home occupations in compliance with § 170-25 of this chapter.
H. 
Residential conversion to not more than two dwelling units of any single-family detached dwelling that existed as of the date of adoption of this chapter, provided that the dimensional and development regulations for a two-family detached dwelling and all other zoning requirements are met.
[Amended 10-3-2023 by Ord. No. 2023-03]
A. 
Only one principal use shall be allowed on a lot.
B. 
Minimum buildable area for each building lot shall be equal to the minimum lot size specified in Table 170-56C below or 21,780 square feet, whichever is smaller.
C. 
The minimum lot area, minimum lot width, maximum building coverage, maximum impervious surface coverage, and minimum front, side and rear yard setbacks required for each permitted use in the R-3 Medium-Density Residential District are as prescribed in Table 170-56C herein.
Table 170-56C
Dimensional Regulations: R-3 Medium-Density Residential District
Dwelling/Use Type
Minimum Lot Area
(square feet)
Minimum Lot Width
(feet)
Maximum Building Coverage
(%)
Maximum Impervious Surface Coverage
(% of lot area)
Minimum Front Yard
(feet)
Minimum Side Yard
(feet)
Minimum Rear Yard
(feet)
Single-family detached
10,000
80
14
20
25
15
30
Lot line house
7,000
60
30
40
25
30 (one only)
30
Village house
6,200
55
20
30
15
10
30
Patio house
4,500
45
30
35
25
10
0
Single-family semidetached
5,000 per du
40 per du
25
35
25
20 (one only)
30
Two-family detached
5,000 per du
40 per du
20
30
25
15
30
All other uses (except parks, recreation areas, and institutions)
43,560 (1 acre)
150
20
50
30
20
30
D. 
Access to a public street. As an exception to the requirements of § 170-11 of this chapter, each and every lot in the R-3 District shall abut a public street at the ultimate right-of-way line for at least 50 feet or the minimum lot width requirement for the specific dwelling/use type, whichever is smaller, and said frontage must be usable for purposes of ingress and egress to the lot.
E. 
Additional setback regulations.
(1) 
A lot with multiple street frontages shall have a front yard setback along each frontage.
(2) 
If a standard building line has been established by previous development on adjoining streets, and it is less than the minimum front yard setback required for that dwelling type as set forth above, the minimum front yard setback for a new development shall be the average front yard setback of existing principal buildings within 500 feet to either side of the proposed development.
(3) 
Lot line house. Only one side yard is required for lot line houses. Unless a side yard having a minimum setback of five feet is provided for the second side yard, a five-foot-wide maintenance easement shall be provided along the side lot line. Minimum distance between a lot line house and another dwelling shall be 30 feet.
(4) 
Two side yard setbacks are required for single-family and two-family detached dwellings, and one side yard setback is required for single-family and two-family semidetached dwellings.
F. 
Zoning district boundary setback. A minimum setback of 50 feet is required between any semidetached principal building in the R-3 Medium-Density Residential District and any Township boundary or any boundary of a residential zoning district with a maximum permitted density of two units per acre or lower. This setback may be part of a required yard area and shall include landscaping and/or berming according to the provisions of Chapter 145, Subdivision and Land Development.
G. 
Unless specifically regulated elsewhere in this chapter, the maximum height for all accessory buildings and structures is 15 feet and is 35 feet for all other buildings and structures. (See § 170-24 and § 170-32 for additional height regulations.)
H. 
Subdivision and land development. All applicants seeking subdivision and/or land development approval shall comply with and follow the requirements of § 170-41, Environmental adjustment factors, to determine the development capacity of the site.
A. 
All development in the R-3 Medium-Density Residential District shall be served by public water and sewer.
B. 
All development shall comply with the provisions of Chapter 145, Subdivision and Land Development.
C. 
All development shall comply with the parking requirements of Article XVII of this chapter.
D. 
Open space. All developments in the R-3 Medium-Density Residential District with patio house, single-family semidetached, and two-family detached dwelling types, and with 12 units or more, shall have required permanent open space, according to the following standards:
(1) 
Amount of open space.
(a) 
The amount of the open space shall be as follows:
Dwelling Type
Required Open Space
Patio house dwelling
25% of tract area
Single-family semidetached dwelling
30% of tract area
Two-family detached dwelling
30% of tract area
(b) 
For mixed dwelling type developments, the open space shall be calculated according to the acreage for each particular dwelling type. For example, a development with half patio house dwellings and half two-family detached dwellings shall be required to have 27.5% open space. A development with half village house dwellings and half two-family detached dwellings shall be required to have 15% open space.
(2) 
Ownership. The open space shall be conveyed in accordance with one or more of the following methods, as approved by the Board of Supervisors:
(a) 
Dedication in fee-simple to Lower Frederick Township, at the option of the Board of Supervisors.
(b) 
Conveyance of title (including beneficial ownership) to: an association, condominium, conservancy, corporation, funded community trust, individual or other legal entity for maintenance purposes.
(c) 
Fee-simple ownership with conveyance of restrictive covenants, conservation easements, or other suitable legal device to: Lower Frederick Township, an association, condominium, conservancy, corporation, funded community trust, individual or other legal entity for maintenance purposes. The terms of such instrument of conveyance shall include provisions to the Township for guaranteeing the continued use of such land for open space and recreation.
(3) 
Design. The open space shall not include required setback areas, except for the zoning district boundary setback required by § 170-56F herein, shall have adequate access, and shall be designed in one or more of the following ways, as approved by the Board of Supervisors:
(a) 
Buffer area, to buffer the impact of new development from existing, adjacent development.
(b) 
Preservation of natural features, such as woodlands, stream valleys, wetlands, or steep slopes.
(c) 
Central green or parkway, which shall be located in a central position in the neighborhood, surrounded by streets and/or building lots on at least three sides, and designed and landscaped as a space for common neighborhood use.
(d) 
Up to 50% of the area of a stormwater basin may be counted towards the open space requirement, according to the following criteria:
[1] 
The slope of any part of the basin shall not exceed 5:1.
[2] 
The basin shall be designed to incorporate curvilinear features that blend with the surrounding topography.
[3] 
The basin and surrounding areas shall be planted with a variety of cover vegetation such as lawn grass or naturalized plantings specifically suited for stormwater basins. Plantings shall not interfere with the proper function and stability of the basin.
A. 
The siting of all required parking spaces in the side and rear yard areas of the lots is strongly encouraged. If an alley exists to the rear of the lot, parking off the alley is strongly encouraged. The use of shared or common driveways is also encouraged.
B. 
If the front yard setback includes parking, there shall be a minimum five-foot buffer between the end of the driveway or parking area and the dwelling unit (except in case of a driveway leading to a garage or carport). The buffer area shall be landscaped and shall not be paved.
C. 
Parking shall not interfere with driveways, accessways, sidewalks, or pedestrian walkways.