A Lake Washington contemporary is designed to take advantage of every view and scrap of light.

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A signature of Northwest architecture is a certain transparency between indoors and out. Perhaps it’s the Japanese influence here on the West Coast that inspires such an affinity for landscape. Or maybe the immediacy of mountain and water vistas lures architects to build with glass and more glass. To alleviate light deprivation in our dull, gray climate, architects here are masters at opening up buildings to scoop in as much illumination as possible.

Despite this regional prowess, I’ve never before seen a house open so widely and seamlessly to garden, water and sky as Liz Welch and Sam Wasser’s new home above Lake Washington. The oversized glass sliders appear to peel open as slickly and cleanly as if rolled with a key like the lid of an old-fashioned sardine tin.

Architect Peter Cohan designed the clean-lined cedar and concrete home for the couple and their four children. It hunkers onto the lot, angled to embrace the view, its 5,500 square feet minimized by a low profile and horizontal cedar siding.

Cohan set the house back from the steep bank to allow for active outdoor space. He conceived of the terrace and lawn as the most important “rooms” of the house, encircling them with a ring of activities. Breakfast room, kitchen, dining room, all less than 14 feet deep, plus the more cavernous library, are strung along an interior spine and oriented out to lawn and view. “I love the way the house and lake interact,” says Welch. “The house lets the lake in.”

The line between indoors and out is further blurred by pale oak flooring indoors mirrored by the creamy Texas limestone terrace just outside. Then there’s the ship-like prow of the upstairs deck jutting off the master bedroom. With the glass doors wide open, it’s as if the solidity of the home’s corner dissolves away, leaving the deck hovering above the terrace.

Interior designer Elizabeth Stretch kept the color scheme monochromatic to emphasize the view. Furniture and rugs are in soothing shades of grays, taupes and creams, with a pop of orange cushions and a rough stone fireplace. Upstairs, where the largest deck is given over to a Ping-Pong table, the kids chose their own furniture and fabrics in bright colors from Ikea.

“Liz and Sam bought this lot and realized a traditional house just wouldn’t suit,” says Cohan. Welch, formerly of Microsoft and now a consultant, owned a home in Broadmoor. Wasser, a conservation biologist at the University of Washington, moved from a Craftsman in Phinney Ridge. Now the family lives in a house with an open floor plan and a sleekly modern kitchen. The exterior is slanting planes of a metal roof, concrete as well as cedar walls, and rotund concrete cisterns to hold the water that runs off the roof.

This couple journeyed farther than a few miles north. They leapfrogged in architecture from the early 20th century to the new millennium.

“I grew up in an Eichler house in Northern California with lots of glass and radiant heat,” says Welch. “When the sun pours in here it feels like a trip back, and not such a departure.”

Valerie Easton is a Seattle freelance writer and author of “A Pattern Garden.” Her e-mail address is valeaston@comcast.net. Benjamin Benschneider is a Pacific Northwest magazine staff photographer.