Reston is fortunate to have many contemporary style homes. Washingtonians often tell me they are frustrated that they find so few contemporary style homes in the metro area and are overwhelmed with the abundance of colonials. The use of shed roofs in contemporary home design was popular in the 1970’s and early 1980’s and is often attributed as originating with the work of architects Charles Moore and Robert Venturi. Reston, being a forward-looking planned-community, sought out these modern home designs. In this contemporary style various blocks, each with a shed roof, were arranged in functional groupings to create a visually pleasing and sculptural appearance. As you have described with your home, entrances are often recessed or obscured for privacy.
You are right to be careful about how you handle the design of your addition. The design of shed roof style homes require that the massing of forms and their proportions be aesthetically pleasing. A badly handled design will diminish your home’s value. Most shed roof contemporaries utilize two or three shed roofs in an asymmetrical arrangement.
In terms of the design for your new addition, I suggest that the existing house remain the dominant form within the design. I see three ways that the addition can be designed depending upon site conditions. In each scheme the new addition should be subordinate to the original house and the new roof pitch should resemble the existing.
A shed roof has the benefit of the large vaulted interior space it creates. As you mentioned, your home has a dramatic interior with large expanses of glass. With your new addition it is possible to have a vaulted ceiling in your kitchen or breakfast room which greatly enhances the drama of the space.
The contemporary nature of the shed roof style home requires that the exterior materials be simple, often uniform and accentuate the simple block forms of the design. For this reason, architects Charles Moore and Robert Venturi typically utilized wood-shingles as an exterior skin. Cladding for most contemporary shed roof homes ranged from wood-shingle, horizontal, vertical and diagonal boarding, which is sometimes mixed with brick veneer or stucco. Occasionally the shed roofs are clad in metal or wood-shingles. Most frequently these homes utilize a cost-effective asphalt shingle.
The window styles for shed roof contemporary homes are usually simple. Large expanses of glass without mullions are used in the designs to maximize views, natural light and bring the outdoors inside. Casement windows, awning windows, slide-by windows, or fixed glass panels are typically found. Double-hung windows, common in Colonial style homes, are rarely used in contemporaries. Sliding glass doors and double French doors can also be found. In recent years homeowners have begun to replace the old single-glazed windows of the 1970s with energy efficient double glazed units.
You mentioned building the new kitchen addition in the footprint of your existing deck. However, your old deck will not be structurally appropriate for your new kitchen addition, so it must be removed. You can add a new deck beyond the addition if local zoning laws allow for it. Every addition requires a proper foundation and ideally it should be masonry.
These design guidelines will help you in planning your home’s new addition and when communicating with the design professional of your choice. For further design and construction guidelines contact your local neighborhood association.
Bruce Wentworth, AIA, is the principal of Wentworth, Inc, a residential architecture, interiors and construction practice. For questions about architectural style considerations in the greater Washington area, consult our free resources at www.wentworthstudio.com or call 240-395-0705.