Pollution, allergens and Covid have homeowners focusing on filtration systems and flexible designs to improve indoor air quality
7 min
Visitors to John Bautista and Pedro Salrach’s San Francisco home can’t get enough of the lap pool, sauna and movie theatre. But they also get a whiff of something else they value: clean air.
“The house smells new—and after two years it still smells new,” said Bautista, an attorney. “I know when I’m home because it smells clean and fresh.”
The six-bedroom home with seven bathrooms and two half-baths includes an elaborate air-filtration system meant to deal with the region’s varying air quality. The tightly sealed floor-to-ceiling windows and sliding doors offer hilltop views of the bay and access to the backyard without sacrificing air quality.
Bautista plans to further upgrade his system this year with the aim of filtering and recirculating indoor air rather than fresh outside air during periods of heavy pollution. Despite the home’s superior air quality, the family can still feel a difference on days when the outdoor air is filled with smoke. “We’ve suffered, as most people have in the Bay Area,” he said. “What we want to have is isolation.”
Developer Gregory Malin, who specialises in wellness-focused real estate, sold Bautista the home for $32 million, he said, plus an additional $5 million for fixtures and furnishings.
Luxury homeowners are known to splurge on sleek kitchens, custom decor and art, but they are increasingly turning their attention to something less visible. Forest-fire smoke, the pandemic and increased awareness of sensitivities to mould and other irritants are making their interior environment a priority.
Many are investing in complex systems and flexible designs that promise healthier indoor air but still include spaces, such as glass-enclosed rooms, that make being indoors feel natural.
Listings are increasingly touting pollution-fighting amenities to lure home buyers. In Santa Rosa, Calif., a 13-acre estate for sale at $15 million has a whole-home air purifier. This spring, the Dovecote building, under construction in Manhattan’s Harlem neighbourhood, will offer six, three-bedroom condos built to strict green and clean-air standards, starting at $1.5 million.
Malin, founder of Troon Pacific, a San Francisco-based developer of $15 million to $45 million properties that he calls healthy homes, said he focuses on the smallest details that can affect air quality. New tools allow for more-precise measurement of various particulate matter and carbon dioxide levels, he added. “Covid changed people’s perspective on connecting air quality to health, and the [wildfires] only enhanced that.”
His company’s newer homes have exhaust fans, tied to ventilation systems, in laundry rooms and under sinks, where there are various pollutants and harmful cleaning products, said Malin. Their garages have separate exhaust fans that go on long enough for three air exchanges after the door opens. Ionisation-based filtration systems also are included to eliminate airborne particles too tiny to see but hazardous when inhaled.
His homes also feature perforated piping with in-line fans to exhaust air from under slab foundations to keep contaminated soil vapours from entering the houses.
He said his company is considering building to the Living Building Challenge standard, in which homes have their own electricity, water and waste management. Demand is high for such standards, he said, including passive-home construction, where airtight homes are built using specific materials and energy-efficient systems that circulate highly filtered air. He said passive-home certification is costly, especially for big homes, and has limitations that some homeowners don’t want, like bulky windows. In the long run, however, he said eliminating most heating and cooling bills is probably worth it.
Clean air has become more of a talking point in homeownership, added Elliott Gall, an associate professor of mechanical and materials engineering who researches indoor-air quality at Portland State University.
While high-rises are often built to be airtight, there is a greater focus now on having windows that open while adding better filtration systems, he said. Units with outdoor access sometimes give homeowners another way to control the humidity and indoor air-pollution levels inside the home, he added.
To improve the air quality in her new Charleston, S.C., home, Caroline Smythe, 67, imported a hemp block covered in a mixture of lime and sand for the construction, rather than standard brick. Living in a high-humidity area means moisture can cause mould, said Smythe, whose 2,400-square-foot Lowcountry home was completed in 2023 for about $1 million, including $250,000 for the land.
Incorporating the new material allows the moisture to get absorbed in the walls and keeps humidity steady in the home. “It has very much an earthy feel,” said Smythe of her thick, soundproof walls.
Inside, the home’s two bedrooms and two offices have additional air-filtration elements, including stand-alone air filters for each bedroom. Smythe, a psychiatrist, chose a bamboo kitchen countertop and mineral-based wall paint to prevent any chemical off-gassing. “It makes a huge difference,” she said.
Homeowners have long tried to improve air quality. In the early 1900s, homes that let in fresh air were critical to good health, but by the 1950s some owners were trying to tame outdoor air pollution by focusing on better insulation. More recently, the pandemic made access to outdoor air essential, and turned the focus again to indoor-outdoor living.
Today’s picture is mixed. Climate change has made outdoor air quality less reliable, with the added problems of prolonged forest fires.
Many people are realising their indoor air quality is often compromised by a combination of poor indoor airflow, activities like cooking and cleaning, and outdoor pollutants that settle into confined spaces, said Gall. Homeowners now want better control over their wider living space, including modifiable systems that deal with both indoor and outdoor pollution, he added.
Jason Glatt, a commercial window contractor, and his wife, Lauren Glatt, a stay-at-home mom, of North Bethesda, Md., built a $2.5 million home that includes a children’s slide into a basement playroom, an attic-level cigar room and plenty of entertaining space.
The 11,000-square-foot home’s most striking feature, however, may be the five HVAC units tucked inside utility closets and other closed rooms, controlled by eight thermostats that regulate the air quality as well as temperature in each part of the home. Their $120,000 HVAC system also includes UV lights to prevent mold.
Seth Ballard, an architect who worked with the Glatt family, said individually controlled temperature zones and more return-air vents promote better air flow. Costs can be $100,000 to $200,000 for a 10,000- to 15,000-square-foot house. “They are choosing this over a kitchen countertop,” he said of homeowners in general.
Charlotte of the Upper West Side, a building in Manhattan that opened in 2023, has seven full-floor units, each with a private entrance. The building has airtight construction with enhanced insulation. Each unit has an independent heating-and-cooling system with fresh-air filtration directly into the home that isn’t shared with other spaces.
The system can achieve full air exchange 13 times a day in normal-use mode and more than 28 times a day in boost mode, said the building’s developer John Roe of the New York-based Roe Corp. The building uses louvers outside the windows to deflect the heat of the sun and cut energy use on summer days.
Roe, who lives in one of the building’s 3,570-square-foot, four bedroom, 4.5-bathroom homes, said the air-filtration system and strict passive-home construction added 15% to the building cost.
Three of the building’s units are on sale, from $8.35 million to $17 million.
He said there is little dust in the home, and he swears it now takes longer for his cut white hydrangeas to wilt.
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Kit Braden, an executive at French beauty empire L’Occitane, has spent every winter for the past 13 years at the stone vacation home.
2 min
A historic Barbados estate with a 300-year-old villa and 11 acres overlooking the Caribbean Sea is now for sale with a guide price of $22.5 million.
The seller is Kit Braden, chairman of the U.K. branch of French beauty empire L’Occitane Group, whose family has spent every winter for the last 13 years at the island property, known as Fustic Estate.
“It’s very much a family house,” Braden said. “We love having a lot of people there. It’s a collection point to keep everyone together.”
The main villa dates to 1712, though it’s been reimagined and expanded substantially over the years.
It spans 13,000 square feet and features seven en suite bedrooms across three wings, as well as expansive verandas, stone courtyards and rows of louvered doors in gay Caribbean pastels.
In the 1970s, when the home was owned by Charles Graves—brother of British poet Robert Graves—it was reimagined by stage designer Oliver Messel, one of the foremost theater designers of the last century. Messel expanded the home, added a lagoon pool with a natural waterfall and other theatrical features, according to Braden.
“The whole place is a little bit magical,” he said.
The home sits about 350 feet above the water, and surrounded by lush gardens that slope towards the water.
“We look down through our garden—which is about 12 acres of tropical gardens and palm trees and wonderful old mahogany trees—onto the Caribbean,” Braden said.
He and his wife first saw the property on New Year’s Eve 2013, during a quick trip from where they were staying in Grenada.
The couple spent an hour walking the perimeter, some of it still untouched jungle, in the pouring rain.
“By the time we got back, I had fallen in love with it,” Braden said.
His wife, however, wasn’t so sure. But in Braden’s telling, a second visit in sunnier weather with two of their children brought her around.
“She had to be talked into that it was a jolly good idea; now she absolutely loves it,” he said.
When they bought the property, the edge that runs along the waterfront was a jungle, so they cleared the ridge and transformed it into gardens.
They also bought an additional sea-level parcel with two beach cottages, giving the property direct access to the water and the town below via a five-minute walk.
The property also has a 15-person staff, a reflecting pond, an outdoor pavilion suitable for yoga and a commercial grade kitchen that can serve more than 100 guests, according to a brochure from Knight Frank, which posted the listing in March. They did not provide further comment.
For Braden, the property is special because of its natural beauty, its proximity to the town of Saint Lucy and its history—which dates way way back to when the island of Barbados was first formed via tectonic activity.
“It was basically tectonic plates that collided about a million years ago so the seabed is the top of the hill,” Braden said. “We’re on coral rock.”
As a result, Fustic Estate includes an extensive network of caves that were likely used by the Arawaks, a Venezuelan fishing tribe that followed the fish to these islands about a thousand years ago.
“If the fish were good they’d camp here,” Braden said. “There’s evidence that they stayed there in those caves, they lived there in good winters.”
Now it’s someone else’s turn to live on the land shared by Arawaks, the plantation owners of 1712, Charles Graves and the Braden brood.
