Most homes meet code.
That does not mean they are healthy.
On this episode of Built. Trusted. Chosen., I sat down with Craig Leonard, owner of Leonard Crafted Homes in Texas. Craig is a third-generation builder who grew up on job sites, stepped away to teach for nearly a decade, and returned to the family business in 2018.
Two years ago, everything changed.
Craig’s wife began showing symptoms that mirrored MS and rheumatoid arthritis. Their children developed issues. Craig experienced brain fog. After extensive testing, they discovered widespread mould contamination in their home. They ultimately tore it down to dirt.
That experience forced Craig to question standard construction practices.
Here’s what trades and construction leaders need to understand.
Modern “Energy Efficient” Homes Can Trap Moisture
Over the last few decades, homes have become tighter in the name of energy efficiency. Air exchange with the outside has been reduced. Temperatures are kept constant year-round.
But when you create a sealed box and fill it with people who cook, shower and breathe moisture into the air every day, you create an internal ecosystem.
Humidity builds. Condensation forms. Mould can begin growing at just 55% relative humidity, even when it doesn’t feel humid.
Craig explained that green construction has focused heavily on efficiency, but not enough on conditioning air properly for moisture, particulates and contaminants.
Efficiency without system thinking creates risk.
HVAC Systems in Unconditioned Attics Become Mould Distribution Networks
In Craig’s previous home, the HVAC system was installed in an unconditioned attic. In Texas summers, that attic reached around 150 degrees. Inside the cooling coil, temperatures sat around 50 degrees.
That extreme temperature difference created heavy condensation inside the ductwork.
The result was microbial growth inside the HVAC system. And because HVAC distributes air throughout the home, it also distributed mould spores and mycotoxins everywhere.
This is not a rare scenario.
For builders and trades, system placement matters. Conditioning attic spaces and reviewing duct materials are not small technical details. They directly impact indoor air quality.
Windows, Shower Pans and Hidden Water Failures
Craig also identified common risk areas that are often overlooked.
Windows that are not properly sealed or water tested during framing can allow infiltration into wall cavities. Aluminium window frames can create condensation that runs into walls.
Tile showers with inadequate waterproofing allow water behind the tile because grout itself is not waterproof.
These issues often pass inspection. They look fine. But moisture accumulates over time.
Water testing windows during framing, installing proper waterproofing systems and treating moisture management as a primary design consideration should be standard practice.
Healthy Construction Adds 3–5% but Protects Families
Craig is upfront about cost.
Healthy, high-performance construction typically adds around 3–5% to the total build price.
After losing his home and receiving no insurance support because mould is excluded, that 3–5% feels like inexpensive insurance.
His rebuilt home is larger, fully conditioned, includes improved ventilation systems and actually costs less per month to operate than the original.
For growth-oriented construction leaders, this is more than a technical upgrade. It is a strategic positioning opportunity.
Competing on price is fragile. Competing on performance, protection and long-term value is powerful.
Niche Positioning Creates Strength
Craig does not try to serve everyone.
Leonard Crafted Homes builds eight to ten luxury custom homes per year, with a median price around 2.7 million dollars. Their marketing clearly communicates their philosophy around high-performance and health.
That clarity attracts the right clients.
When you stand for something specific, you stop competing purely on cost. You create differentiation.
For builders navigating tight margins and market pressure, that shift can mean survival.
Next Step
If you are in trades or construction, ask yourself:
Are you building to meet minimum code, or are you building to protect people?
The future of construction will favour those who think beyond efficiency and focus on performance, health and trust.
Craig Leonard is the owner of Leonard Crafted Homes, a Texas-based luxury custom home builder specialising in high-performance, health-focused residential construction. After losing his own home to mould contamination, Craig became a building biologist and now integrates advanced ventilation and moisture management systems into every home he builds.
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