Purple thistles, California poppies, clover, and dandelions have all taken root in the roughly 10-inch-deep, lightweight humus and grape-husk soil in this 580-square-foot green roof. Designer Peter Liang says that he "wanted to plant a green roof for its thermal mass, but I wanted it to be as natural as possible."

Suzanne and Brooks Kelley at the back of their 1,100-square-foot guest cottage.

The owners toured this home, which surrounds a mature tipu tipu tree, while visiting relatives for the day. The brick is original to the 1947 construction.

Sliding doors by Quantum were made to look like the original panes that couldn't be saved, and they lead to a fire pit outside.

At the top of the stairwell, a sitting area is outfitted with a vintage Eames lounge, a large Jack Goldstein painting, and a 1970s light fixture found by Marcovitz in Paris.

The view!

The kitchen features a concrete island topped with marble. Deja-Vu stools by Naoto Fukasawa surround the island. A print by Guy Gormley, as well as a painting bought during holiday in St. Tropez, hang on the walls.

Take a look at some of the most exciting, sustainable buildings around the world, and you may notice something they have in common: green roofs, or rooftops covered with a thin layer of soil to allow for grasses and other low-lying plants to grow.

"It was rundown, dark, and divided," recalls Masaaki of his first impression of the warehouse, the ground floor of a multistory apartment building. But after some thought, Masaaki, a Japanese-born architect, and Esther, an artist from Minorca, realized that owning the combined 2,700 square feet would allow them to headquarter Mas-aqui, the architecture and design firm they were planning to start, on-site. They bought the property and within months transformed it into a bright, modern live/work space.

The dining area features a PH5 pendant by Poul Henningsen for Louis Poulsen, a T12 table by Hay, and Møller Model 77 side chairs. A 1960s rocking chair by Vladimir Kagan sets off the living area.

New Depths Inspired by a local winery, George Kyprianou wanted a glass top on his subterranean wine cellar. The interior is lit, casting soft light into the living space at night and revealing the 132-year-old stone foundation. The three-quarter-inch glass lid sits flush with the floorboards; it opens with an ingenious device that Kyprianou devised using a 12-volt air compressor and a remote-controlled switch. When you push the button, the glass lifts just enough to be removed by hand.

NOEM, a Barcelona–based architecture firm, created a metal-clad house for a young client just outside Madrid. It’s raised 12 feet off the ground to offer better views of the landscape, lending it "the futuristic feeling that it just landed," says Pol Guiu, one of NOEM’s cofounders.

Light Box Peter created a simple uplight at the top of the wood box by wiring together energy-efficient fluorescent fixtures typically used under cabinets and countertops. “The cheaper magnetic models hum unacceptably loudly, so make sure you get the electronic ballast types,” he warns. He then painted the cavity white to reflect light and covered them with quarter-inch-thick acrylic from TAP Plastics. homedepot.com tapplastics.com

“A building can have far greater impact than the space it stands in.”—William Carpenter, architect and resident

The view of Kapiti Island is fully revealed from the tower.

The Jorgensen's Menlo Park home is a model of green design with features that are smart for everyone to consider. "Every project is different, but there are some universal things that will apply from project to project," says Feldman about designing a green home. "The first—and most obvious thing—is to always try to build less, to have a smaller house and be smart about how the rooms are designed and oriented so that you can get by with less space. Smart design will lead to a smaller building, but it won't feel smaller."

New zoning allowed for a zero-lot-line structure, but required a public storefront, which Carpenter uses as an art gallery.

"Shane enjoys both cooking and entertaining so we maximized the counter space to make meal prep and hosting easy," Priftaj says. "It was also very important that the kitchen include a gas grill so he could quickly and conveniently grill without having to climb up five flights of stairs to use the bbq on the patio." Priftaj selected high-gloss acrylic white cabinets from bulthaup's b3 line with an aluminum backsplash and b3 prism drawer system to keep things tidy. A Wolf hood and gas cooktop with chargrill give Carslake the flexibility he desired for indoor grilling. The counters are polished white quartz.

The top container contains Wardell's office—and a "napping nook" above that.

In the dining area, a one-of-a-kind table with a reclaimed Carrara marble top by NET—themultidisciplinary design firm of architect Alejandro Sticotti, with whom Nicolas works—is surrounded by prototypes of the company’s Board chair. The family dog, China, sits on a floor made of travertine tiles.

Rian and Melissa Jorgensen's 2 Bar House in Menlo Park boasts all the usual green design suspects: energy-efficient lighting, good insulation, renewable material finishes, radiant heat, and the roof is pre-wired for future PV panels. Executed by Feldman Architecture, the house requires only natural lighting during the day which keeps energy costs way down. Still, the most stunning aspect of the green design is the living roof planted with succulents, aloe, viviums, and ice plants. "I'm absolutely glad that we did it," says Melissa. "It turned out so well and I really enjoy sitting up there and taking advantage of it as much as I can. It's very peaceful." Read more about this total remodel here.

The architects added a small circular skylight to serve as a vertical focal point in the center of the fifth floor. The quarter-sawn white oak risers produce a beautiful rippled grain highlighted by the abundant natural light.

The Kelleys furnished the cottage with help from Suzanne’s daughter Betsy Burbank of Betsy Burbank Interiors. Classic modernist icons, such as a Saarinen Womb chair for Knoll, a Herman Miller Eames lounge chair, and an Eileen Grey E1027 side table look at home alongside present-day pieces such as an Encore sofa (which handily folds down into a sleeping surface) from Room & Board and a Doka rug designed and produced by Stephanie Odegard. The Wohlert pendant lights from Louis Poulsen were designed by Vilhelm Wohlert in 1959, but grouped as such, they appear distinctly contemporary.

The living room, dining room and kitchen are in one open space. The flooring is bamboo. The cabinetry is a mix of bamboo, walnut, and maple, and was fabricated by City Cabinetmakers out of San Francisco.

The countertops in the kitchen are a mix of quartz surfaces and custom and salvaged stainless steel. "We use the kitchen all of the time, it turned out really nice," says Melissa. "It's very open, certainly one of the central focuses of the house, and is fun for entertaining."

Despite the cast-on-site concrete dividers, there's still an airy sense of space; the dividers support, instead of overwhelm. This approach came from the architects' constant sense of experimentation and playfulness, a deliberate approach that helped them find new ways to use recycled and salvaged materials.

"It was supposed to be as naked as possible," says Alexandru Popescu, one of the members of R3Architetti who helped design and build the 3 Vaults apartment. "The furniture is absolutely included in the architecture; it’s more like an indoor landscape instead of a typical open plan." The kitchen exemplifies their approach, with textured concrete walls contrasting with wood panels and salvaged industrial lighting. The table, custom built by R3Architetti, is made in part from pipes procured from one of their fathers, a plumber.

The exterior of Connect 4L 1,600 sf 3 bed 3 bath 2 story modern prefab.

The playroom later became Xenia’s office.

The yellow North Face tent looms over the top of the main building.

Yvette, Adrian, and their son Julian survey the view from the top-floor terrace. “I’ve never been fond of modernism—I find it cold,” Adrian admits. “But having this house, I have to say, it’s growing on me.”

Still, it’s possible to remove or relocate non-structural walls in a home with good bones.

Shelter No. 2, Broisson Architects, 2008 This prefab made mostly of recycled materials is modest, but not too modest for a spiral staircase. Three levels culminate in a large skylight, which filters natural light all the way down to the ground floor's hydroponic garden.

The master bedroom occupies a private space on the top floor.

It Will Get Loud: A Small Speaker That's Big on Sound Home audio companies are managing to make speakers smaller, more portable, and more wallet-friendly while keeping sound quality as robust as their larger (and pricier) brethren. Soundfreaq's co-founder and creative director Matthew Paprocki will demo and deconstruct the award-winning Sound Stack and demo Sound Platform 2 to let you in on the technology behind making big sound come from a tiny package. See this Saturday, June 22, at 12:30 p.m. on the Demonstration Stage.