The purposes of the Forest Hills Tree and Slope Protection Residential R-10 zone are to:

  • Preserve and enhance the park-like setting of designated neighborhoods bounded by Connecticut Avenue and Thirty-Second Street on the west, Rock Creek Park on the east, Fort Circle National Park and Nevada Avenue, N.W. on the north, and Melvin C. Hazen Park and adjacent to streams and parks on the south, by regulating alteration or disturbance of terrain, destruction of trees, and the ground coverage of permitted buildings and other impervious surfaces. It includes Soapstone Valley Park as well as Melvin C. Hazen Park;
  • Preserve the natural topography and mature trees to the maximum extent feasible in the Forest Hills neighborhoods;
  • Prevent significant adverse impact on adjacent open space, parkland, stream beds, or other environmentally sensitive natural areas; and
  • Limit permitted ground coverage of new and expanded buildings and other construction, so as to encourage a general compatibility between the siting of new buildings or construction and the existing neighborhood.



The Forest Hills Tree and Slope Protection zones have a significant quantity of steep slopes, stands of mature trees, are located at the edge of stream beds and public open spaces, and have undeveloped lots and parcels subject to potential terrain alteration and tree removal. Few lots are developed on a rectangular grid system.

The R-10 zone is intended to:

  • allow for areas of detached dwellings;
  • Retain the single dwelling-unit nature of these areas; and
  • Prohibit denser types of residential development.


Development Standards
Height (ft.)1/
Minimum Lot Width (ft.) Area (sq. ft.) Lot Occupancy Front Setback Read Yard (ft.) Side Yard (ft.)2, 3 Pervious Surface (minimum)4 Zoning Regulation Reference
R-10 40 40 (detached) 4,000 (detached) 30% A front setback shall be provided within the range of existing front setbacks of all structures on the same side of the street in the block where the building is proposed. 20 24 ft. in the aggregate, with no single side yard having a width less than 8 ft. 50% Subtitle D, Chapter 5
32 (IZ detached) 3,200 (IZ detached)
30 (semi-detached) 3,000 (semi-detached)
3 25 (IZ semi-detached) 2,500 (IZ semi-detached)
40 (all other structures) 4,000 (all other structures)

Use Permissions Parking Inclusionary Zoning
Subtitle U, Chapter 2 Subtitle C, Chapter 7 Subtitle C, Chapter 10
R- Use Group B

1 Institutional buildings or structures may be erected to a height not exceeding 90 ft., provided that the building or structure shall be removed from all lot lines of its lot a distance of not less than 1 ft. for each foot of height in excess of that authorized in the zone in which it is located.

2 A building with a side setback less than 8 ft. wide, an extension or addition may be made to the building; provided, that the width of the existing side setback shall not be decreased; and provided further, that the width of the existing side setback shall be a minimum of 5 ft..

3 When a single household dwelling, flat, or multiple dwelling is erected that does not share a common division wall with an existing building or a building is  being constructed together with the new building, there shall be a side yard on each resulting free-standing side.

4 This requirement shall not preclude enlargement of a principal building in existence as of May 18, 2007; or create nonconformity of a structure as regulated by this title.