Rustic Midcentury Lake Cabin in New Hampshire by KCS Architects

Top: Middle and second story floor plan. Bottom: Main level floor plan.

Stairs run up the south side of the cabin to the new deck, which sits atop the dining addition and is accessible from the primary suite. “The couple can go from the lake right up to their bathroom,” Sutherland says.

The redesign includes a new outdoor shower and deck on the north side of the house.

The owners commissioned Claypoole Hexsigns in Lenhartsville, Pennsylvania, to copy the cabin’s original hex sign, which hung in the same spot. “The original one was deteriorated, so we ultimately commissioned a new one,” the wife says. “It means ‘Good Luck in All Four Seasons of the Year.’”

Sutherland enlarged the window openings on the west facade. A new expanse of glass spans two stories, providing a stellar view of the lake from the living area on the main level and the new primary suite above it. The Haiku fan light is by Big Ass Fans.

The owners purchased the double chaise from ABC Carpet & Home for the downstairs living area, but it didn’t quite fit—so it lives in the corner of their bedroom.

Existing structural ties frame the upholstered Blu Dot bed in the new primary bedroom. The owners purchased the Heywood Wakefield nightstands from Strictly Hey-Wake in Hagerstown, Maryland. The duvet is made from fabric by MissPrint.

Sutherland added a skylight to new primary bath, which is located behind the couple’s bedroom. The custom maple vanity has a white concrete top and Kohler Purist fixtures. The glass Roku wall tile in Rain Gloss is by Walter Zanger, and the ceramic floor tile is Original Style Moonbeam penny round. The new door is a copy of the cabin’s original interior doors. “I love how the wood door plays against the modern tile,” Sutherland says.

A custom-colored concrete sink with integrated ledge completes the powder room under the stairs, which previously contained just a toilet. The den (pictured at the top of the stairs), guest room, bunk rooms, and family bath are a half flight up from the main level.

Sutherland added a large arrangement of windows facing the lake in the living room. The top windows are tilt-and-turn, and the bottom windows are fixed. The owners bought the sofas at ABC Carpet & Home in Manhattan, and the coffee table at Camden Market in London. The pillows are made from Dandelion Two fabric by Angie Lewin for St. Jude.

Doors flank the main seating area of the living space. The owners purchased the Heywood Wakefield chairs from Strictly Hey-Wake in Hagerstown, Maryland near the wife’s childhood home. “I’d always wanted Heywood Wakefield furniture, and it fits in really well here,” she says.

Sutherland removed the drop ceiling to cabin’s structural wood beams—between which she carefully hid the conduits for the Juno track lights. The family plays games and does puzzles at the picnic table, which is a relic from the original owners.

The newly renovated second story includes a laundry room and adjacent bath behind the primary bedroom. “The laundry and bath are floating in the middle of the space,” Sutherland says.

Mike Secore at MHS Architectural Millwork in Marlborough, New Hampshire built the kitchen cabinetry, which boasts panels in white and natural maple. Teal-colored concrete countertops fabricated and installed by Portland-based Zen Stoneworks add color and accentuate the midcentury-modern vibe.

The kids’ bath has a whole new look that includes orange glass subway tiles by Ann Sacks, ceramic penny tile, an orange trough sink, and sconces from Barn Light Company. The custom recessed medicine chest is made from mahogany with a butternut-colored finish.

The existing pine wall boards in the guest bedroom are painted white to reflect light. The windows look east. The furniture is from Room & Board, and the pendant light is by George Nelson. The pillows and duvet are made from fabric by MissPrint.

A new addition accommodates a spacious, sunny dining area. The wife, a huge Gillian Welch fan, purchased the silkscreen prints above the banquette specifically for the space. Michael Miritello of Century Design Workshop in Cincinnati made the dining table. The pendant light is from Barn Electric Company, the table lamp in the corner is from a local vintage shop, and the backsplash tile was designed by Angela Adams for Ann Sacks.

The owners preserved the existing bunk rooms on either end of the house for their son and daughter. Sutherland enlarged the windows for a better view of the lake.

Original pine wall boards are painted white to reflect light in the den. A George Nelson pendant hangs above a clean-lined sectional sofa atop carpet tiles by FLOR. The pillows are made from MissPrint Garden City fabric, and the quilt is from Haptic Lab.