This section provides an explanation of the dimensional standards for each building type, defines how to measure certain standards, and provides other requirements and reference information as necessary.
A. Number of buildings.
a. Notwithstanding the Littleton Subdivision Regulations, §
249-104 of the Code of the Town of Littleton, multiple buildings are permitted on each lot, subject to the maximum lot coverage permitted by §
173-220B, Standards for all lots.
B. Buildings.
a. Buildings are comprised of one or more primary massings and various optional building components that are assembled to make a single building complex. See §
173-221M, Building assembly, for more information on how primary massings and components may be assembled.
i. The primary massing(s) defines the principal form and scale of a building complex.
ii. Building components are accessory elements that are attached to the primary massing to increase a building’s usefulness and provide an important means for achieving variety and individuality in design.
b. The maximum amount of floor space permitted for any building is determined by the actual motor-vehicle parking provided on a lot in accordance with §
173-224A, Required parking spaces.
C. Primary massings.
a. The primary massing(s) of a building must be of rectangular form with a single type of pitched roof and may be oriented either with the narrow end or long side toward the front lot line, subject to §
173-221M, Building assembly.
b. Width of the primary massing is measured parallel to the facade, from the exterior plane of each side wall.
c. Depth of the primary massing is measured perpendicularly from the facade as the maximum length the longest exterior side wall of a building.
 Wide Example |  Deep Example |
D. Story height.
a. Each individual story of a building must comply with the minimum and maximum story height requirements specified for each building type and is measured independently for each story of a building.
i. The height of the ground story and second story of a building is measured vertically from the surface of the finished floor to the surface of the finished floor above, at all points.
ii. The height of a half story is measured vertically from the surface of the finished floor to the highest point of the ceiling above.
b. The roof rafters of a half story must intersect the wall plate or top of wall frame of the exterior walls at a height no more than two feet above the finished floor of the half-story.
E. Number of stories.
a. Buildings must comply with the maximum number of stories specified for each building type.
b. The ground story is always counted as one story, except that a single ground story over 16 feet in height is counted as two stories.
c. The second story is counted as one additional story, except that any upper story with a mezzanine or loft is counted as two stories.
d. Basements are not counted as one story unless the finished floor of the ground story is five feet or more above the average ground level of the lot.
e. Habitable space located directly under a pitched roof is counted as a half (0.5) story. Non-habitable attic space located under a pitched roof is not counted as a half story.
F. Building height.
a. Buildings must comply with the maximum building height specified for each building type. Building height is measured as defined in Article
II, Definitions.
G. Fenestration.
a. Fenestration must be provided as indicated for each building type and is calculated as a percentage of the area of a facade.
b. For buildings with ground story commercial spaces, ground story fenestration is measured between two feet and 12 feet above the finished floor of the ground story.
c. For all other buildings and all other stories, fenestration is measured independently for each story, corresponding with the top of a finished floor to the top of the finished floor above.
d. Fenestration enclosed with glass may be included in the calculation if it meets the following criteria:
i. For ground story fenestration, glazing must have a minimum 60% Visible Light Transmittance (VLT) and no more than 15% Visible Light Reflectance (VLR) as indicated by the manufacturer.
ii. For upper story fenestration, glazing must have a minimum of 40% VLT and no more than 15% VLR as indicated by the manufacturer.
iii. The Planning Board shall require applicants to submit the material specifications from window suppliers to confirm fenestration glazing is compliant with the above as a condition of any Site Plan approval.
H. Building separation.
a. Multiple buildings on a single lot must comply with the building separation distance specified for each building type at all points.
I. Roofs.
a. Non-habitable architectural features including, but not limited to, mechanical and stairwell penthouses; vents or exhausts; solar panels or skylights; belfries, chimneys, cupolas, parapets, spires, and steeples are permitted on roofs.
J. Use and features.
a. Occupation of floor space by different permitted uses is limited or restricted for buildings dependent upon their position on a lot.
i. Any building contributing toward the frontage build out calculation must also provide ground story commercial space that is at least 20 feet in depth, measured as the distance from the facade towards the interior of the building, for 100% of the total width of the building. Only non-residential uses may occupy this commercial space.
ii. Any other building on a lot that does not contribute toward the frontage build out calculation is restricted only to residential uses.
b. Each primary massing must have at least one principal entrance.
i. The principal entrance of a building must be located on the facade for any building contributing toward the frontage build out calculation.
ii. The principal entrance of any other building on a lot should be located on the facade or, as an alternative, on the side wall oriented toward the parking lot provided for the building.
c. Multi-story buildings with ground floor commercial spaces must have one principal entrance for each commercial space in addition to any principal entrance(s) necessary for any upper stories.
d. The maximum number of dwelling units permitted for any building is determined by the actual motor-vehicle parking spaces provided on a lot as required by §
173-224A, Required parking spaces.
K. General building standards.
 |
Primary Massing | Use and Features |
| Width (max) | — | | Ground Story Occupation | Any Use, subject to the requirements of Article V and § 173-221J |
A | Narrow End Oriented Front | 45 ft | | Upper Story Occupation | Any Use, subject to the requirements of Article V and § 173-221J |
B | Long Side Oriented Front | 65 ft | | Ground Story Fenestration | — |
| Depth (max) | — | | | Commercial (min) | 60% |
C | Narrow End Oriented Front | 90 ft | | | Residential (min/max) | 15% | 25% |
D | Long Side Oriented Front | 45 ft | | Upper Story Fenestration | — |
Height | | | All Uses (min/max) | 15% | 25% |
E | Ground Story Height | — | Building Separation |
| | Commercial (min) | 14 ft | I | Distance from any other building (min) | 20 ft |
| | Residential (min/max) | 10 ft | 12 ft | |
F | Second Story Height (min/max) | 10 ft | 12 ft |
G | Half Story Height | — |
| | Commercial (min/max) | 10 ft | 16 ft |
| | Residential (min/max) | 10 ft | 12 ft |
| Number of Stories (max) | 2.5 Stories |
H | Building Height, Feet (max) | — |
| | Mixed Use | 36 ft |
| | All Residential | 32 ft |
L. Building components.
a. Building components are accessory features that increase the habitable square footage or enhance the usefulness of a building and are permitted according to the following schedule.
b. Building components that are not identified below are prohibited.
a. | Side Addition | b. | Rear Addition |
 |  |
A | Setback from Facade and Rear Wall (min) | 8 ft (long side) 4 ft (narrow end) | A | Setback from Side Walls (min) | 8 ft (long side) 4 ft (narrow end) |
B | Projection (max) | 18 ft or 50% of the width of the attached primary massing1 | B | Projection (max) | 18 ft or 50% of the depth of the attached primary massing1 |
C | Stories (max) | Same as the attached primary massing | C | Stories (max) | One (1) half story less than the attached primary massing |
D | Roof Ridge Offset (min) | 4 ft | | | |
| Design Standards: Side additions may attach only to the side wall(s) of a primary massing. Side additions must have a roof type matching the roof of the main massing. | | Design Standards: A rear addition may have a flat roof. |
NOTE: | NOTE: |
1 | Whichever is less. | 1 | Whichever is less. |
c. | Projecting Gable | d. | Projecting Storefront |
 |  |
A | Width (max) | Equal to the shortest side of the attached primary massing | A | Width (max) | 36 ft |
B | Projection (max) | 6 ft | B | Projection (max) | 10 ft |
C | Height (min) | Height of Building in Stories | C | Height (max) | 1 Story |
D | Front Setback Encroachment (max) | 6 ft | D | Front Setback Encroachment (max) | 6 ft |
| Design Standards: A projecting gable may attach only the facade of a primary massing. The roof ridge of a projecting gable must be perpendicular to the roof ridge of the attached primary massing. | | Design Standards: A projecting storefront may attach only to the facade of a primary massing. A projecting storefront may have a flat roof. |
e. | Dormer | f. | Cross Gable |
 |  |
A | Single Dormer Width (max) | Window(s) width + 18 inches | A | Width (max) | 50% of the roof eave below |
| Cumulative Width of all Dormers (max) | 50% of the roof eave | B | Height (min) | Equal to the height of the roof of the attached primary massing |
B | Exterior Wall Setback (min) | — | | Design Standards: The roof ridge of a cross gable must be perpendicular to the roof ridge of the attached primary massing. The rakes and ridge of the roof of the cross gable must be structurally integrated into the eave and ridge of roof of the attached primary massing. Cross gables may interconnect to provide access and continuity between the half stories of two attached primary massings that are oriented in the same direction. |
| | Roof with Eave | 0 ft | |
| | Roof without Eave | 1 ft | |
C | Setback from Gable (min) | 3 ft | |
D | Separation from another Dormer (min) | 50% of dormer width | |
| Design Standards: The face wall of a dormer window may not project beyond the exterior wall of the building and may not interrupt the eave of the roof. | |
e. | Bay Window | f. | Balcony |
 |  |
A | Single Bay Width (max) | 16 ft | A | Width (min) | 5 ft |
| Cumulative Bay Width (max) | 50% of the width of the exterior wall from which the bays project | B | Depth (min) | 4 ft |
B | Projection (max) | 3 ft | | Area (min) | 25 sf |
C | Stories (max) | Same as the attached primary massing | C | Front Setback Encroachment (max) | 5 ft |
D | Front Setback Encroachment (max) | 3 ft | | | |
| Design Standards: Bays may attach to any exterior wall of a primary massing, side addition, or rear addition. A bay window may have a flat roof. | | Design Standards: Balconies may attach to any exterior wall of a primary massing, side addition, or rear addition. Balconies may be recessed, projecting, a combination of the two, or terraced as part of the roof of a permitted building component. |
M. Building assembly.
a. Up to three primary massings are permitted per building complex.
b. Primary massings may attach as follows:
i. Directly to the side or rear of another primary massing; or
ii. To a side or rear addition building component.
c. The exterior walls of multiple primary massings of the same building complex must always be offset from one another by at least eight feet, even when connected by a side or rear addition.
d. No more than two primary massings may be oriented in the same direction for a single building complex. For example, if two primary massings orient their narrow ends toward the front lot line, a third primary massing must be oriented with its long side toward the front lot line.
Example Massing Combinations |
(optional side and rear additions in grey) |
1 Primary Massing  |
2 Primary Massing  |
3 Primary Massing  |
N. Frontage types.
a. Frontage types provide access to principal entrances and serve as the interface and transition between the private realm (building interiors) and the public realm (sidewalks and public spaces) and are defined by a combination of site features and facade characteristics.
b. Frontage types are permitted according to the following schedule.
c. Frontage types not expressly authorized are prohibited.
d. Multiple frontage types are permitted for buildings with more than one principal entrance.
a. | Gallery  | A frontage type consisting of a storefront(s) and an attached lightweight colonnade with a roof, open pergola, or balcony overlapping a paved sidewalk. A gallery may wrap around the corner of a building to create a veranda-like gallery. Projection from Facade (min): 8 ft Clearance (min): 8 ft |
b. | Entry Plaza  | A frontage type consisting of a storefront(s) and a highly paved frontage area. Plaza Pavement (min): 80% Seating (min): 1 linear foot/60 sf Bicycle Parking Spaces (min): 2 |
c. | Dining Patio  | A frontage type consisting of a storefront(s) and outdoor cafe seating in the frontage area. Depth (min/max): 6 ft/15 ft Pedestrian Access, Clear (min): 4 ft • Tables larger than three feet six inches in width or diameter are not permitted. • Standing or stooled table ledges, if provided, must be 18 inches in depth. |
d. | Front Garden  | A frontage type consisting of a storefront(s) and highly landscaped frontage area. Landscaped Area1 (min): 80% Pedestrian Access, Clear (min): 4 ft Bicycle Parking Spaces (min): 2 |
e. | Porch  | A frontage type consisting of a raised platform with a roof supported by columns, piers, or posts; an area for seating; and an optional set of stairs with a landing that provides access to the entrance of a building. Projection (min): 6 ft Clearance (min): 8 ft Furniture Area, Clear (min): 6 ft x 6 ft Bicycle Parking Spaces (min): 2 |
f. | Dooryard or Stoop  | A frontage type consisting of a zero-step entrance or a set of stairs with a landing that provides access to the entrance of a building. • Fencing up to 4 ft in height may delineate the boundary of a private front garden for individual ground story dwelling units. |
g. | Common Lobby  | A frontage type consisting of assembly of entry doors and windows providing access and light to the lobby of a building. Bicycle Parking Spaces (min): 2 |