Architect Tamira Sawatzky used Ikea components—one-inch Lagan butcher block countertops and inexpensive Ekby Lerberg brackets—when designing the bookshelves along the living room wall in the home/studio he designed for himself and his wife in Toronto.

A sofa from Design Within Reach opposes a Hi Turn chair by Bensen in the living room.

Sheridan Coakley, owner of the London-based furnishings purveyor SCP, uses his circa-1970s home as a testing ground for the furnishings he carries in his company’s inventory. In the foreground, a Balzac lounge chair by Matthew Hilton is draped with a Donna Wilson blanket.

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.

Rodriguez, a designer and architect who runs the studio Agi Miagi, created the pendant lamp and terrariums in the dining area. The space is open to the living area, where Brown’s son, Hugo, sits on a Living Divani sofa. The countertop-table is by Bercy Chen Studio.

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The acclaimed Italian designers Ludovica + Roberto Palomba carved a serene retreat out of a 17th-century oil mill in Salento.

In the living room, spare Scandinavian design takes center stage. Hans Wegner’s Wishbone chairs surround an Essay dining table by Cecilie Manz for Fritz Hansen; a mostly wood palette is enhanced by slate-gray brick around the fireplace. The paper lanterns throughout the home are a mixture of classics by Isamu Noguchi alongside those picked up in Japan and France.

In the living area of actor Vincent Kartheiser’s Hollywood cabin, redesigned by Funn Roberts to maximize every last inch of space, an Eames lounge chair and ottoman mix with a couch and coffee table by Cisco Home from HD Buttercup. The table in the main room is from West Elm.

“We didn’t go out and buy a living room collection,” Sofie explains. “In our home, we tried to avoid trends. The furniture we have are things we have collected over many, many years.” Vintage Eames for Herman Miller lounge chair; Isamu Nuguchi table; and Rocking elephant by Rocking Zoo.

The living room is furnished with a Tolomeo Mega floor lamp by Artemide, a Milo Baughman Recliner 74, a Morsø 7648 wood stove, and a Hampton rug by Capel Rugs.

Two San Francisco art and travel addicts overhauled a loft—and customized a pair of shipping containers—to accommodate their collection and reflect their passions. The shipping containers were stacked, joined with steel tubes, and lashed to reinforced floor joints to make them earthquake-safe.

Walker carried the aquatic color palette over to the new den, which sits just off of the kitchen-dining area.

In the living room, a sofa by Vico Magistretti is next to a plywood armchair by Gerald Summers. The coffee table is by Enzo Mari; the Cesta lantern is by Miguel Milá for Santa & Cole. “It’s too expected for us to put Hans Wegner here,” Duncanson explains.

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Blanc took the term "living room" to a different level with this striking 20-by-23-foot interior wall for the Dimanche family's home in Paris.

The living and dining room look out to the central courtyard, promoting indoor/outdoor living. Here, five doors slide into a pocket in the wall to create a nearly 23-foot-wide opening on one side looking into the garden. Another set on the opposite side enhances cross ventilation.

Halfway through a pregnancy isn’t exactly the ideal time to buy a house. So after spending months scouting San Francisco’s Victorians and turnkey cookie-cutters—and almost defecting to the East Bay—Lorena Siminovich and Esteban Kerner decided to put the hunt on hold until after their baby was born. But then one afternoon Kerner, a design director with Old Navy, logged on to Craigslist on a whim. He saw a below-market listing for a single-family home in Noe Valley, their neighborhood of choice. With crumbly brick cladding, peeling rust-brown paint, and rotting garage doors, the house lacked curb appeal. But the Argentine couple was drawn to the interior. "It was amazing and strange at the same time," says Kerner of the 1,485-square-foot, multilevel, midcentury maze. "Mind-boggling," adds Siminovich. "It was just a knot of doors and a series of insane stairs to nowhere."

Builder Ross Percival helped finesse the finely tuned detailing that separates the internal slope from the rock outside (opposite). The Pedro wire stool is by Craig Bond for Candywhistle.

The concrete wall mimics the slope of the hill outside as a reference to early Maori structures that were dug into the land. The simple kitchen has strandboard cabinetry and an MDF island that conceals a fireplace at one end. The ceramic works on the built-in seat at right are by Raewyn Atkinson and Robyn Lewis.

In the living room, an Eames lounge chair is matched with a Richard Conover–designed fiberglass chair in similar proportions. A custom coffee table by Asher Israelow com-plements the industrial lighting by Workstead, affixed to walls painted in Farrow and Ball’s Manor House Gray. The sliding doors leading into the home office were fabricated by Markus Bartenschlager.

In the dining area, Splügen Bräu pendant lamps for Flos hang over a Super-Elliptical table by Piet Hein and Bruno Mathsson for Fritz Hansen.

Zebra-print cushion covers from H&M Home and a pair of tables by Patricia Urquiola for B&B Italia provide a colorful counterpoint to the neutral palette of the living area’s B&B Italia sofa and Pernilla 69 armchairs by Bruno Mathsson for Dux. A Lotta Döbling painting from Domeij Gallery hangs on the wall.

Three small pavilions connected by a deck form a summer retreat that balances privacy with a panoramic view—all in less than 900 square feet. Among the three pavilions are the standard comforts of any home: a kitchen, living space, and dining area are situated in an open floor plan in the main cabin, where a collection of vintage pieces—including leather lounge chairs from Belgium and a modern fireplace by Preway (whose chimney stretches into the tall ceilings)—mix with white Bertoia wire chairs and Noguchi table lamps.

In the flat’s living room, midcentury modern art and furniture harmonize with the rich floor tiles, opulent molded ceilings. and original pine wood doors. Prints by Gordon Matta-Clark line the wall near a 1950s Danish dining table that’s paired with Eames chairs. A painting by Kuuti Lavonen hangs above a pink chair and ottoman by Ronan and Erwan Bouroullec.

The picture wall is adorned with images collected from family, colleagues, and estate sales. ”I kill plants, so cacti are our friends,” Peter says of the succulents along the low table behind the Design Within Reach sofa, just over which an Established & Sons Font clock keeps time.

Interior designer Anne Sophie Goneau gave an apartment in a former factory a bright makeover. The minimal gas fireplace is from Ortal, acting as a focal point in the room, complete with integrated shelving.

Architect William Massie built a hybrid prefab home for vintage retailer Greg Wooten, who handled the interiors. In the living room is a 1950s Franco Albini rattan chair, a Crate chair designed by Gerrit Rietveld in 1934, and a 1970s sofa by Edward Axel Roffman. The tall ceramic piece is by Bruno Gambone.

A Movie sofa, by CB2, and a Rais wood-burning stove are in the living room.

Rather than go with the expected hardwood treatment, Scenario installed springier vinyl flooring on the home's top level. Its open circulation incorporates areas for study, eating, and lounging—a key fulfillment of the client’s directive for an engaging environment that maximizes contact and interaction.

The entrance to the living room includes a seating area where guests can remove their shoes.

Yeo descends the spiral staircase that connects the public and private spaces while Ian relaxes on a pair of Cappellini Superlight 750 sofas designed by Barber Osgerby. The Gwapa lounge chair and ottoman in the corner were designed by Marcel Wanders.

Howard and Shumate in the living room, where Commune designer Steven Johanknecht introduced custom built-in daybeds with storage beneath. The carpet-fragment pillows are from Commune, as is the table, designed by Joshua Tree–based sculptor Alma Allen. The poster is by Mike Mills.

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For the seating area, the couple selected a Charles sofa by Antonio Citterio for B&B Italia in addition to CH07 Shell chairs by Hans Wegner, a PK61 coffee table by Poul Kjærholm, and a Nesta rug from Design Within Reach. The dining table, an original design by Burnette, is surrounded by stools that belonged to a previous owner.

Otto is a handsome complement to the Persian Sarouk rug and Gray’s sophisticated interior design work.