Architecture firm NADAAA planned a striated addition to a brick neo-Georgian house in Boston with the owners’ primary goal in mind: to engage with the outdoors year-round. The walls of the rear kitchen and living space are virtually all glass, allowing sight lines to the existing gardens and new pool house through a series of framed vignettes onto the backyard landscape. The glass box is bookended by uniform “fins” that mark the edge of each picture window, as shown here. Photo by John Horner.

The dramatic rear elevation showcases the open-plan living and dining room. Apart from the addition, the rest of the home maintained its “traditional” layout, with bedrooms branching off from a central hallway. Windows on all sides of the addition bring light in and make the space feel bright and expansive. Tonal and textural contrast can be seen between the burnt ash cladding at the exterior and the engineered European oak flooring at the interior. Through thoughtful design and space planning, the architects and owners made the biggest impact possible with only 500 square feet of added living space.

White was used extensively throughout the addition, a choice that the architects say enhances the spacious feel of the rooms and draws attention to the views.

The courtyard is just one of many open spaces that will be highly utilized—in the non-winter months anyway. Concrete worked well with developing the language of FlatPak. The second level is a wood panel that can be clad in corrugated metal or cedar—different layers that can be plugged in like covers on your cellphone.

Modern bathroom vanities in white bathe the room in light, creating a relaxing atmosphere. Mirroring the kitchen of this home, the bathroom features custom wooden cabinetry and Brodware faucets.

When the Ferguson Sauder family—parents Meg, a school counselor, and Tim, a design instructor, plus kids Cole, Olive, and Asher—wanted a multifunctional backyard addition, they decided to build it themselves. Two Liftoff chairs by Tim Miller, one of Tim’s former students, surround an oil-drum fire pit set in granite dug up on the property. On the deck, the Panamericana chair is by Industry of All Nations.

Gaffney's cousin lives in the house just in front. To give a bit of perspective, this photo was likely taken just feet in front of the waist-high wall that runs between the two houses's yards.

A familiar scene in the Benoit home: Peter paints at the Steelcase desk—"I do all my work here," he says—while Ando sits nearby, waiting for attention.

The building retains its original footprint; this was an important detail for the homeowners who wanted to be as environmentally-friendly as possible. “The biggest element I work with is to use the existing structure when I remodel,” says Juilland.

The owners’ goal was to transform the 19th-century building into a bold single-family residence. Historical architectural details were made modern with a striking black facade, while inside, a flexible living space that opens into an exterior garden enables a simplified lifestyle.

Claire and Ken Stevens approached architect Ko Wibowo to create a modern addition to their 1970s home in Tacoma, Washington. The couple’s needs had changed since Ken was diagnosed with Alzheimer’s a few years ago.

From the street, only the main house and one adjoining addition are visible, belying the spacious extension at the back. The architects call this the “Tardis effect,” named for the time machine on Dr. Who that looks much smaller on the outside than it does within.

The couple's house, designed by architect L. Jane Hastings in the early 1970s, is located on a steeply sloped site that backs up to a state park.

The bungalow had beautiful bones but some major problems, including a poorly designed addition to the back that had to be removed. In its place, Tribe Studio designed a gray brick box that connects directly to the garden. “The owners love the fact that the extension is compatible with the old part of the house, and is completely different from many renovations of this type, which simply open up the back in a single move,” Tribe says.

The outbuilding serves as a studio, a guest house, and a playroom. A Murphy bed sourced from Craigslist was customized with a birch surround to give it a built-in appearance.

A found Eero Saarinen Executive chair was restored with help from a local auto body shop.

A good dose of inspiration from Luis Barragán turned a dark and beleaguered midcentury house into a family home for the ages. The paint colors chosen by the residents and architect Linda Taalman are American Cheese and Blushing Bride, both by Benjamin Moore, creating a tapestry of color and texture.

The back of the house has sliding doors that open far enough to expose the entire livingroom to the families' back yard.

The glass balustrade and floor were sourced in Germany and installed by James Aiken. Angelique, the founder of Papillon Designs and Landscaping, clustered plantings around the exterior glass addition.

Architect Gregory Phillips connected the original house to a new modern extension that doesn’t interfere with the surrounding houses. “I try to be true to the location,”he explains, “so it doesn’t seem like some spaceship has landed.”

A new addition to Sea Ranch’s enclave of utopian homes, this structure (and the separate guesthouse seen here) clad in rough concrete and Cor-ten steel seamlessly blends in with its half-a-century-old California neighbors. Designed by the dean of the Woodbury School of Architecture and the head of the University of Oregon’s architecture department, its spaces flow into one another underneath an angled plywood ceiling and illuminate built-in furniture crafted from vertical-grain Douglas fir.

The roughly 5,000-square-foot Lens House renovation, which was finished in 2012 and just won a 2014 RIBA National Award, required six years, major remedial work on the roof and walls, approval from the planning committee, and even a sign-off from a horticulturalist to guarantee the backyard excavation didn't interfere with a walnut tree. "These things aren’t for people who are in a hurry," says architect Alison Brooks. The focus is the ten-sided trapezoidal office addition. "It wraps itself around the house with a completely different set of rules than the Victorian building," she says.

“It’s a great house for a young family—playful, practical and different,” Tribe says. “You can sit on the windowsill in the sun and feed the baby, kids can climb in and out, often through the windows, and you can see everything that is going on.”

The clients had an impressive collection of Scandinavian midcentury teak furniture that now pops beautifully against the concrete floors, white-painted brick, and pine v-joint walls.

For the the living room, the architects designed a cluster of picture windows that frame unique views—a jacaranda tree or a patch of sky—and block out neighbors from a nearby apartment building.

The custom kitchen cabinets sit on legs for easy sweeping underneath. They’re topped with white Corian counters and paired with sleek Brodware fixtures.

A 1960s midcentury home in Austin was renovated by local practice Webber + Studio, with a second story added while preserving the home’s original character.

Thellend Fortin Architectes designed this two-story addition in the OUtremont neighborhood of Monteal to capture views from the steeply sloping lot.

The Perth residence of Renee Coleman via the Design Files.

Roberto Burneo designed this home for his eldest niece, her husband, and their three young children in a suburb outside Quito, the capital of Ecuador. The house is set on a flat expanse of land with fruit trees, and Burneo's design "guides the social areas inward in order to link them to the gardens.”

On one side of the house, a white central staircase leads to a split-level landing the Robertsons call "the reading room." "We needed a place to hang out and for the kids to read," explains owner Vivi Nguyen-Robertson. Awaiting the birth of the couple's son, she relaxes in a built-in reading nook in the library.

To keep the project close to their $10,000 budget, the family looked for bargains whenever possible. The circular window was a misorder they snagged for 90 percent off from a local building supply store. The mahogany siding is a mix of Craigslist purchases and Dumpster finds.

Burneo took advantage of the perpendicular orientation of the volumes to create outdoor spaces that look out to the gardens.

The Mazess House first “addition”—considered such for the retention of a portion of the original 1919 home’s footprint—was incorporated in 1996 by AIA Award–winning Michael W. Folonis.

The ground-floor sauna, one of the home’s central gathering spots, is built from stained alder. The electric heater is from the Finnish company Iki.

Designed in 1960, the house was originally a lodge to accommodate horse trails. Throughout the years, the house has expanded with various additions and renovations.