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This Kirkland guest suite turned unused space under a modern home into a bright, comfortable lower-level addition with a guest suite and an exercise room. A new stairwell with custom steel railings connects the main floor to the lower level. It also brings in natural light and matches the home’s modern style. Polished concrete floors with radiant heat keep the space comfortable all year. The guest suite has a luxury en suite bathroom with a steam shower, and it can also work as a home office. In addition, large NanaWall doors open the exercise room to the outdoors and the sauna, and a built-in beverage station keeps refreshments close.

The project took creative problem solving. Structural limits and property setbacks meant we had to fit a code-compliant staircase into a tight space. We also excavated a crawlspace to reach full ceiling height and worked around foundation walls to make the most of the space. As a result, the addition is practical, cohesive and beautifully detailed.

Crescent Builds Design-Build Project | Photos by PorchLight Imaging

Explore more home additions by Crescent Builds.

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New stairwell bump-out with a black metal railing linking a Kirkland mudroom to the lower level

A new stairwell bump-out connects the main-floor mudroom to the lower-level guest suite. Its form and details follow the home’s existing modern design, so the addition feels built in rather than added on.

Kirkland lower level home gym with a climbing wall bars and exercise bikes

Once an outdoor play area, the lower level is now a guest suite with a workout room and direct access to the outdoor sauna. A NanaWall bi-fold door opens the space up, blending privacy, wellness and indoor-outdoor living.

Kirkland side yard with horizontal wood fencing and the new stairwell bump-out
Exterior wood stairs with a cedar railing along a Kirkland home's side yard
Kirkland stairwell with a black horizontal metal railing and tall narrow window
Wood stair treads and black metal railing in a Kirkland stairwell bump-out
Close-up of a black horizontal bar railing on wood stairs in a Kirkland home
Outdoor cedar sauna built into the hillside of a Kirkland backyard
Kirkland lower level home gym with a folding glass wall opening to a side yard
Kirkland lower level home gym with rubber flooring, treadmill, and wall bars
Kirkland lower level kitchenette with a wine fridge and door to the side yard
Kirkland lower level guest suite entry with white storage and stair access
Kirkland lower level home office with dual monitors and white bookshelves
Kirkland guest suite bathroom with a marble look tile shower and gray floating vanity
Kirkland guest suite steam shower with marble-look tile walls and floor and a linear drain
Marble look tile shower niche in a Kirkland guest suite bathroom