Journal
Journal
Field notes from the intersection of architecture, interior design, and human biology. Published when something is true and stable enough to publish, not on a calendar.
Notes from the WELL Executive fireside chat with Rachel Hodgdon at the WELL 2026 London Summit, and why the home is the building that matters most.
Kas Bordier
Most people choose paint by colour, finish and price. Your walls are among the largest material surfaces in your home. Five checks, and the one question to ask before you buy.
Kas Bordier · September 2026
Canyon Ranch now sells homes where purified air comes as standard. So who engineered yours? Three checks you can run yourself, starting in the next three minutes.
Kas Bordier · July 2026
The four things we check in a bedroom before we trust it, and most eight-figure homes fail at least two. Air, light, sound, materials, and the fixes that cost nothing.
Kas Bordier · July 2026
Michael Breus spends two hours tuning the sleeper. Then he stands up, walks into a bedroom, and starts naming the pillars.
Kas Bordier · July 2026
You spend more than ninety percent of your life indoors. Here are nine quiet things your home does to your body, and the fix for each one.
Kas Bordier · July 2026
Bryan Johnson measures almost everything about his body. The one system he breathes for eight hours a night mostly goes unaudited. Here are three checks you can run today.
Kas Bordier · July 2026
What Stockholm taught us about being superhuman. Notes from the Super Human summit, the science of growing old, and the room the body lives in.
Kas Bordier · June 2026
Enes Yilmazer just toured a twenty-three million dollar villa above the Pacific, and it is genuinely beautiful. I watched the whole thing waiting for the one thing a tour never shows you.
Kas Bordier · May 2026
Kayla Barnes-Lentz built a three million dollar home around her own biology. Usually I read a home tour to point out what the room is missing. This time, she did not miss it.
Kas Bordier · May 2026
David Sinclair calls ageing a loss of information: the cell still holds its original code but forgets how to read it. Reprogramming can restore the software. The room you live in is the static that keeps scratching the disc.
Kas Bordier · May 2026
Peter Attia shows fitness is the strongest lever there is, with up to a fourfold spread in mortality across cardiorespiratory fitness. It is built in the gym in about an hour a day. It is kept, or lost, in the twenty-three hours you spend at home.
Kas Bordier · May 2026
A wearable measures the body with remarkable precision. It cannot see the room those readings are made in. The most accurate tracker on your wrist is still blind to the single largest variable in the data: the building you sleep in.
Kas Bordier · May 2026
Martin Picard reframes mitochondria as information processors that turn everything you experience into the energy you feel. He counts the social and psychological load. The building is the load nobody counts.
Kas Bordier · May 2026
Dan Belsky changed the question from how old are you to how fast are you ageing right now, and built a clock that measures it. The pace is modifiable. The largest input nobody monitors is the room.
Kas Bordier · May 2026
The five pillars of exercise for longevity build the body in six to eight hours a week. The building it recovers in runs the other one hundred and sixty. One of these is authored by willpower. The other is authored by architecture, or by accident.
Kas Bordier · May 2026
There is a reason you instinctively choose the corner banquette in the restaurant, facing the door. The reason is older than language, older than architecture, older than the human family. A 1975 thesis from a British landscape geographer argued that we never stopped reading rooms the way our ancestors read landscapes. We are still looking for the cave with a view of the grass.
Kas Bordier · May 2026
Above 1000 ppm of carbon dioxide, decision-making and complex-task performance measurably degrade. A closed bedroom passes that threshold by mid-evening. The single highest-leverage architectural intervention in most homes is a window cracked one centimetre.
Kas Bordier · May 2026
Behaviour-change advice is endless; behaviour-change adherence is exhausting. The architecture of the home programmes habits before intention does. A walkable floor plan is the most reliable longevity protocol most people have ever followed without noticing.
Kas Bordier · May 2026
Bryan Johnson optimises his biology in greater detail than almost any human alive. The house his biology lives inside is, on the public evidence, a back-of-the-envelope. Here is the architectural specification a Blueprint practitioner is undoing every night they sleep.
Kas Bordier · May 2026
Bryan Johnson optimises the body. MAVI optimises the room the body lives in. The two halves describe the full longevity stack, and most practitioners are undoing one with the other.
Kas Bordier · May 2026
A working vocabulary for designers, architects, and homeowners. Updated as the discipline matures.
MAVI Editorial · April 2026
A correctly designed wellness suite makes the immune system stop fighting the room.
Kas Bordier · April 2026
The science is unsettled. The architecture, conservatively, is not.
MAVI Editorial · April 2026
Why a single tree, framed correctly, lowers blood pressure measurably more than a bedroom full of houseplants.
Kas Bordier · April 2026
A bedroom held at 22°C overnight is metabolically expensive. The body has nowhere to put its heat.
Kas Bordier · March 2026
Why ambient noise, not the noise you hear, but the noise you have stopped hearing, is the largest unsolved problem in luxury residential.
Kas Bordier · March 2026
Filtered water at the kitchen tap is a 2010s consideration. The 2020s consideration is filtered water at every fixture, including the shower.
Kas Bordier · March 2026
The most consequential drug a luxury home delivers is light. Most homes deliver the wrong dose at the wrong time.
Kas Bordier · February 2026
Why the calmest rooms are not the quietest, they are the chemically silent ones.
Kas Bordier · February 2026
Why your bedroom, not your supplement stack, is the most consequential intervention you have on the rest of your life.
Kas Bordier · January 2026
\"I don't feel like myself.\" This is how perimenopause begins for most women. For 7 to 10 years, they will navigate the zone of chaos with virtually no support, in homes never designed for the transition.
Kas Bordier · January 2026
The spaces women inhabit either amplify hormonal chaos or provide biological refuge. Most homes were designed during an era when medicine was studied exclusively on male physiology.
Kas Bordier · January 2026
Thermal comfort is regulated by the hypothalamus. Disruption affects mood, performance, and productivity, with profound chemical changes when buildings are too cold or overheated.
Olga Turner Baker · January 2026
Most luxury homes feel healthy. Few can prove it. A verified home treats biology like a design requirement, not a vibe, with measurable targets, pass/fail thresholds, and a verification protocol at handover.
Shouka Amirsolimani · January 2026
Jefferies London Prime Real Estate says UHNW buyers are shifting from finishes to biology-first homes built for sleep, air quality, recovery, and performance. The benchmark for trophy property is changing.
Damien Jefferies · January 2026
Your home is not just where you live. It is the most consistent variable in your health equation, and likely the most overlooked investment in your wealth.
Kas Bordier · January 2026
Sleep is only one chapter of circadian health. Your home writes the rest. Daylight, electric light spectra, blackout, temperature, air, and acoustics, all commissioned to perform.
Shouka Amirsolimani · December 2025
For the world's most driven individuals, health has become a second job. The body is not the problem. The environment is.
Kas Bordier · December 2025
A building technique that has kept interiors cool for over 3,000 years without electricity. We know about it. Engineers have modelled it. And the standard response is still a sealed glass box.
Kas Bordier · December 2025
The water you drink is a fraction of the water your body encounters every day. The largest chemical exposure most people never think about is the water flowing through every room of their home.
Kas Bordier · December 2025
The home of the future will know you. It will understand your circadian rhythm, sense when you are stressed, monitor air quality in real time, and respond to your biology.
Kas Bordier · November 2025
Humans evolved in natural environments. Our nervous systems are calibrated to those conditions. Modern life has placed us somewhere radically different, and the mismatch has consequences.
Kas Bordier · November 2025
You are treating a biological problem with aesthetic solutions. You are putting a bandage on a building that is silently attacking your physiology.
Kas Bordier · November 2025
Not too much light or too little, but the wrong light at the wrong time. Modern lighting is reshaping your biology in ways you cannot feel until the damage is done.
Kas Bordier · November 2025
The air inside your home is likely more polluted than the air outside. This counterintuitive fact holds true even in cities with significant outdoor air pollution.
Kas Bordier · October 2025
You have tried everything: blue light glasses, sleep supplements, consistent bedtimes. Yet quality sleep remains elusive. The problem might not be your habits. It might be your home.
Kas Bordier · October 2025
A design philosophy that treats the built environment as the first layer of health, recognising that the spaces we inhabit shape our biology before any conscious behaviour enters the equation.
Kas Bordier · October 2025
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