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.

The view!

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 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.

Lightroom 1.0, a photography studio, is a freestanding structure on the property. “Together, they represent an autobiography of my career,” Carpenter says.

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.

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.

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

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

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."

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

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

Fashion designer Josie and her husband Ken Natori are big fans of traditional Japanese architecture, so when Brooklyn-based practice Tsao & McKown Architects designed their home in Pound Ridge, New York, they used a heavy, exposed-timber structure, and included Japanese-style gardens and landscaping.

The owners of this 2,300-square-foot converted loft in SoHo have a penchant for color and collections. To make way for these elements, BC-OA kept new materials simple and desaturated with super white walls; oil-finished, white oak flooring; and white lacquered cabinetry. In the dining area, a custom designed, built-in, tufted banquette adds soft juxtaposition against the live edge dining table. The velvet upholstery is meant to provide contrast against the exposed, white-washed original brick in both texture and era. Overhead a brass chandelier with exposed Edison bulbs references the former Swan Incandescent Electric Light Co. which occupied the loft after construction was completed in 1897.

A look at the home's front facade. In a Melbourne suburb, Splinter Society Architecture designed the versatile home for Mark and Cara Harbottle and their three young children.

Inspired by modern Japanese minimalism, Hong Kong practice JAAK demolished the walls of this two-bedroom apartment and remodelled it into a studio with an

The living area boasts nearly 10-foot-high ceilings that impart a feeling of airiness and spaciousness. Discreet, built-in storage in the floor at the top of the steps prevents clutter from accumulating.

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"In this project, we got so much benefit out of this 'secret garden' for the master suite along with all of these environmental benefits that the residents were excited to embrace. It's one of the pieces we are happiest about," says architect Jonathan Feldman.

Living in between the woods

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 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 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."

The renovated rear portion of the home is connected to the front bedroom and new bathroom via a split staircase leading up to the main bedroom and a studio, and down to the living space. A tiled and plant-filled courtyard divides the dwelling’s public and private spaces, with one side bordering the main living area and the other adding a window to the bathroom and the stairs.

The kitchen island is topped with a five-by-10-foot slab of Carrera marble.

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

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.

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.”