SERVICES · CUSTOM HOME CONSTRUCTION
Custom homes built with precision, transparency, and lasting craft.
Mafic provides full-service general contracting for custom homes in the Gallatin Valley and surrounding Montana communities — combining 25+ years of hands-on experience with modern building science on every project.
WHAT SETS US APART
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Passive House expertise informs every build — even when full certification isn't the goal. Better envelopes, smarter details, more durable homes.
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Transparent budgeting throughout. You see where every dollar goes and why. No surprise change orders at the end.
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We work with a limited number of clients so every project has Stefan's direct involvement.
Montana's housing stock is under-performing. We can fix that.
Most homes in the Gallatin Valley were built well before modern building science. Drafty envelopes, inadequate insulation, and oversized mechanical systems aren't just uncomfortable — they're expensive. A targeted deep energy retrofit can cut heating costs by 60–80% and make your home dramatically more resilient and comfortable.
Our approach to custom home construction
We manage every aspect of the build — from initial site review to final walk-through — with a focus on craftsmanship, communication, and performance.
Solid and precise work
Performed thoughtfully by our carpenters and trusted subcontractors. Every detail considered, not just the ones that show.
Collaborative process
We work closely with you, your architect or designer, and all project partners. No silos, no surprises.
High-performance envelopes
Building science applied to insulation, airtightness, and window placement — even on projects not pursuing Passive House certification.
Field engineering
Anticipating and resolving constructability challenges before they become expensive problems on-site.
OUR PROCESS
From groundwork to move-in.
A custom home is the most significant investment most people make. Our process is designed to keep you informed and in control at every stage — with no surprises at the end.
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We understand your vision, site, timeline, and budget. This forms the foundation of your project plan.
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Full review of architectural drawings for constructability, precise budget development, and a detailed construction schedule.
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We map the build sequence proactively — identifying challenges and resolving them before they cost time or money.
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Skilled on-site teams, meticulous detail, and regular client communication throughout the build.
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Thorough walk-through, quality checks, and complete handover documentation. Plus ongoing support after move-in.
TRANSPARENCY
Open books, throughout.
Construction budgets are notoriously opaque. We run every project with full financial transparency — you see the actual costs, the contingencies, and the reasoning behind every line item. No markups hidden in subcontractor invoices.
This isn't just ethical — it builds the kind of trust that makes complex projects go smoothly.
Detailed pre-construction budget
Line-by-line cost breakdown before work begins
Transparent subcontractor costs
You see actual bids and invoices, not marked-up summaries
Change order process
Every change documented, priced, and approved before work proceeds
Regular financial updates
Budget vs. actual tracking shared throughout construction
Interested in Passive House performance?
Many clients start with a custom home project and choose to pursue Passive House certification once they understand the long-term benefits. We can model both paths so you can make an informed decision early.
Common questions
Do you work with our existing architect?
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Yes. We operate as general contractor alongside your architect or designer, integrating our building science expertise and construction management throughout. Or we can provide full design-build services — see our Design-Build page.
What size projects do you take on?
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We focus on custom residential projects in the Gallatin Valley and surrounding communities. Because we work with a limited number of clients per year, we're selective about fit — the best projects are ones where the client values quality and craft over lowest cost.
How do you handle budget overruns?
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With open books and proactive communication, we rarely have surprise overruns. When costs shift — due to material changes, site conditions, or owner requests — we document and discuss before proceeding, not after.
Can we incorporate energy efficiency without full Passive House certification?
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Absolutely — and we encourage it. High-performance insulation, airtight construction, and smart window placement add modest cost and significant long-term value. Full Passive House certification is one path; high-performance construction is available on every project.
Let's talk about your custom home.
Tell us about your project — site, timeline, and what matters most to you — and we'll schedule a conversation.