SERVICES · PASSIVE HOUSE CONSTRUCTION
Build a home that performs like nothing else in Montana.
Most builders hire a consultant to model energy performance. We design it, model it, and build it in-house — so nothing gets lost between the plans and the field.
80–90%
reduction in heating & cooling costs
0–10%
typical cost premium over standard build — paid back through energy savings
Dual certified
CPHDC + CPHT — designer and tradesperson, one team
Designed for Gallatin Valley's climate extremes.
At -20°F in January and 95°F in July, your home's envelope does the heavy lifting. Passive House construction — continuous insulation, triple-pane windows, airtight membranes, and controlled ventilation — means your home stays comfortable in every condition, with or without active heating.
WHY PASSIVE HOUSE
What you get with a Passive House build
Every benefit is modeled before construction and verified by a third party at completion. These aren't estimates — they're documented outcomes.
Air Quality
Continuous filtered fresh air via ERV/HRV. No stale air, no mold risk, no pollen infiltration.
Consistent comfort
No cold spots, no drafts. Every room holds temperature without hot/cold cycling.
Resilience in outages
Passive homes maintain comfortable temps for days without active heating — critical in Montana power events.
Path to net zero
Low energy demand means a small solar array can power your entire home. No oversized systems needed.
Quiet
Triple-pane glass and thick insulation block road noise and wind — noticeably quieter than standard construction.
Durability
No condensation inside walls means no mold, no rot. Built to last generations with minimal maintenance.
OUR PROCESS
From first conversation to certified home.
Passive House isn't just a construction technique — it starts at the design stage. Here's what working with Mafic looks like from day one.
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We learn your goals, site, budget, and timeline. We explain what Passive House means for your specific project — no jargon.
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Using PHPP or WUFI Passive, we model your home's energy performance before design is finalized. You see predicted heating demand, comfort metrics, and path to certification.
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Our team implements Passive House details in the field — airtight membranes, thermal bridge-free connections, precise window installation. This is where most builders fall short; we don't.
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A blower door test and independent certifier confirm your home performs to spec. You get documented proof — not a promise.
CREDENTIALS
Certified to design it and build it.
Stefan Mitrovich holds both Passive House certifications — designer and tradesperson. That's uncommon in Montana and means your project doesn't depend on handoffs between separate consultants and contractors.
Certified Passive House Designer/Consultant
CPHDC · Passive House Institute
Certified Passive House Tradesperson
CPHT · Passive House Institute
Associate AIA · NCARB
MSU Earth Sciences & Architecture
NAPHN Rocky Mountain Chapter
North American Passive House Network
Common questions
Does Passive House cost significantly more to build?
1
Typically 0–10% more upfront than conventional construction, depending on design complexity and site. The premium pays back quickly through 80–90% lower heating and cooling costs — and never needs a replacement furnace.
Can I get a Passive House certified home in Gallatin County?
2
Yes. We handle the full certification process — energy modeling, documentation, and coordinating third-party verification through PHIUS or PHI. You receive a certified, documented home.
Are there tax incentives for building a high-performance home?
3
Yes — the Inflation Reduction Act includes federal tax credits for energy-efficient new construction and mechanical systems. We help you understand which credits apply to your project at the design stage.
Do you work with our architect, or do you provide design too?
4
Both. Mafic offers full design-build services, or we can work as builder alongside your existing architect or designer. Our Passive House expertise integrates at either stage.
Ready to build Montana's most efficient home?
Most builders hire a consultant to model energy performance. We design it, model it, and build it in-house — so nothing gets lost between the plans and the field.