Passive House Design & Sustainable Architecture in Colorado
Build a home that stays comfortable year-round, handles wildfire smoke, and cuts energy bills by 90%. We bring certified passive house expertise to Durango, Pagosa Springs, and all of Southwest Colorado's mountain communities.
Principles of Passive House Design in High-Altitude Climates
Building at 6,500–8,000 feet in Southwest Colorado means designing for conditions most passive house consultants never encounter. Thin air, intense UV radiation, 60°F daily temperature swings, and snow loads exceeding 100 PSF demand an approach that goes well beyond standard passive house plans. We've refined our methods across projects in Durango, Pagosa Springs, Bayfield, and throughout La Plata and Archuleta Counties to deliver homes that hit passive house metrics while standing up to everything these mountains throw at them.
Every passive house design we produce starts with site-specific energy modeling using WUFI Passive and PHPP software, calibrated for our local climate data — not generic Colorado averages. That modeling drives every decision from wall assembly thickness to window placement, ensuring each home achieves the 15 kWh/m²·year heating demand target that defines true passive house performance.
Extreme Thermal Insulation
Our wall assemblies deliver R-50 to R-70 values using continuous exterior mineral wool over double-stud cavities — eliminating the thermal bridges that destroy conventional insulation performance during Durango's sub-zero nights.
Triple-Pane Window Systems
We specify European-certified triple-pane windows with thermally broken frames, low-E coatings tuned for Colorado's solar intensity, and argon or krypton fill gas for maximum heat retention and UV protection at altitude.
Airtight Construction with ERV
Every joint, penetration, and connection is sealed to achieve 0.6 ACH50 or better. Energy recovery ventilation provides continuous fresh, filtered air at 80–90% heat recovery efficiency — critical during wildfire season.
Optimized Solar Gain
With 300+ sunny days per year, Durango and Pagosa Springs are ideal for passive solar house design. We engineer south-facing glazing ratios and overhang depths calculated to our 37°N latitude for free winter heating.
Sustainable Architecture and Modern Eco House Aesthetics
Passive house design doesn't mean boxy, generic buildings. Our sustainable architecture practice blends Mountain Modern aesthetics with certified high-performance metrics — creating homes that look like they belong in the San Juan Mountains while performing like precision-engineered instruments.
Locally Sourced Colorado Materials
We prioritize low-carbon, regionally harvested materials — beetle-kill pine from Colorado forests, locally quarried sandstone, and recycled steel. Shorter supply chains reduce embodied carbon while supporting the Southwest Colorado economy and giving each modern eco house an authentic regional character.
Mountain Modern Integration
Our design language pairs clean contemporary lines with natural Colorado materials — exposed timber, weathering steel, and native stone. Every element serves double duty: that stone accent wall isn't just beautiful, it's thermal mass storing solar heat. The timber frame isn't just structural, it's the defining aesthetic of your home.
Life-Cycle Material Analysis
We evaluate every material for its full life-cycle impact — manufacturing energy, transport distance, installation waste, service life, and end-of-life recyclability. At 7,000 feet, durability against UV degradation, freeze-thaw cycles, and moisture migration separates materials that last 50 years from those that fail in 10.
Ready to Explore Passive House Design?
Download our free guide to passive house construction in Colorado's mountains, or schedule a one-on-one energy consultation to discuss your project.
Why Southwest Colorado Is Ideal for Passive House Construction
Most people assume passive house design belongs in mild European climates. The opposite is true — Colorado's extreme conditions amplify every benefit of the passive house standard, making the investment even more worthwhile than in temperate regions.
Extreme Temperature Performance
When it's -15°F outside in January and 95°F in July, a conventional home's HVAC runs constantly. A passive house in Pagosa Springs maintains comfortable temperatures with a fraction of the energy — the superinsulated envelope does the heavy lifting, not the mechanical system.
Wildfire Smoke Protection
The 0.6 ACH50 airtightness standard means your home is sealed against smoke infiltration. During fire season, our ERV systems with HEPA filtration keep indoor air quality at healthy levels while neighbors struggle with smoke seeping through every crack and gap.
Solar Gain Advantage
Durango's 300+ sunny days and high-altitude solar intensity make passive solar house strategies remarkably effective. Properly oriented glazing with calculated overhangs provides free heating from November through March — a resource most climates simply don't have.
Grid Resilience
Mountain communities face power outages from winter storms and summer lightning. A passive house holds its temperature for days without power — we've documented homes in Archuleta County maintaining 60°F+ interior temps through 48-hour outages in single-digit weather.
From Energy Modeling to Certified Passive House Plans
Building a passive house in Colorado's mountains requires precision at every stage. Here's how we take your project from concept to a certified, high-performance home.
1. Site Analysis & Climate Modeling
We study your specific lot — solar access, wind exposure, elevation, and surrounding topography. Combined with Durango or Pagosa Springs microclimate data, this analysis shapes every design decision from window placement to wall assembly specifications.
2. PHIUS Energy Modeling
Using WUFI Passive software, we model your home's energy performance before a single board is cut. We iterate on insulation levels, window sizes, and mechanical systems until the design meets the 15 kWh/m²·year heating demand and 0.6 ACH50 airtightness targets.
3. Detailed Passive House Plans
Our construction documents include thermal bridge details at every junction, air barrier continuity plans, and window installation sequences that general contractors can actually build from. No ambiguity, no guessing — every connection is drawn and specified.
4. Construction & Certification
We stay involved through construction, conducting mid-build blower-door tests, verifying air barrier installation, and coordinating PHIUS certification documentation. The result is a home with verified performance — not just design intent.
Explore Our Sustainable Building Services
Passive house design is one part of our comprehensive approach to high-performance building in Southwest Colorado. Explore these related services to find the right path for your project.
Energy-Efficient Retrofitting
Already own a home in Durango or Pagosa Springs? Our deep energy retrofits bring existing homes closer to passive house performance without starting from scratch.
Net Zero Home Construction
Pair your passive house envelope with solar production to achieve net zero energy — producing as much clean energy as your home consumes over the year.
Mountain Home Construction
Building on a steep lot or at high elevation? Our mountain construction expertise ensures your passive house handles the unique structural demands of Colorado terrain.
Our Passive House Projects
High-performance homes designed and built across Southwest Colorado
Small Residential Home Before Major Renovations
Modern Interior Design with Custom Staircase
Small Residential Home Before Major Renovations
Modern Blue Exterior Home Renovation Project
Modern Rustic Kitchen with Custom Island
Modern Rustic Kitchen with Custom Island
Modern Bathroom Renovation with Subway Tile
Custom Curved Glass Block Shower Wall
Custom Dark Wood Walk-In Closet Design
Your Passive House Design Team
Certified expertise in high-performance building for Colorado's mountain climate
Brad Hassel
Founder & Lead Designer
Brad brings over 20 years of high-performance building experience to every passive house project. As one of the first PHIUS-certified consultants in Southwest Colorado, he's guided dozens of homeowners through the passive house process — from energy modeling through final blower-door testing. His hands-on approach means he's on-site for every critical air-sealing detail.
Credentials
Specializations
What Our Clients Say
Homeowners across Durango, Pagosa Springs, and Bayfield trust us with their passive house projects
"Louis Garday, Sr Pagosa Springs, CO 81147 Re: Positive Design - Mark Positiviata December 23, 2025 What I immediately learned when we first started renovating my 4,000 sf log home was that above and beyond everything else, MARK IS A CRAFTSMAN AND PROFESSIONAL in the truest meaning of those words. His work for the planned 10 months was all completed in several diverse areas, on time, on budget, adding a professional flair whenever possible, such that I can easily claim that his skill and craftsman like work on every aspect of the engagement, including concrete and tile work, fine detailed carpentry, building a new 30’ by 20’ TREX deck, electrical work, safety grab bars and plumbing, repairs of metal roof, painting and drywall, landscaping, and a complete home Code evaluation and corrective action. His professional work easily yielded an increase of my home's value at double what I spent on the project. That ROI clearly will show up if/when I sell the house in 2026 or beyond. In a highly confident and in an unqualified manner I strongly recommend Positive Design and Mark to anyone needing all manner of home construction from a true professional and frankly a nice guy. Louis J Garday Sr. More Background information: Sometimes you get lucky. I was introduced to Mark at a dinner in late 2024 and the conversation turned to the details of the multi-faceted work I needed need to renovate and upgrade my 4,000 sf home on ten acres preparatory to selling it in the Spring of 2026 (my best estimate at the time for the optimum timing to sell based on the political/economic chaos brought on by Fed, the then current administration and pending tax law changes during the four years ending in January 2025). I have a lifetime and some 50 years' experience in the construction and real property development businesses, know the trades and have built or developed multiple commercial properties and was impressed with his knowledge during our dinner. The following Monday I received a call from Mark asking if he could walk my property with me and organize my thoughts on what I characterized as extensive work. What followed was a long and detailed survey he compiled of what was needed to remodel and reposition a 30-year-old valuable and custom log home and natural 10-acre landscape of some 200 Ponderosa Pine Trees, surrounded by the San Juan National Forest. Mark made extensive notes and revisited me a few days later, with a detailed proposal, cost estimates, a few new ideas to maximize what I had in place, a time and materials schedule, work timing and scheduling (what us old time real estate guys call a PERT Chart). This being a new relationship and having just met Mark, I agreed to bite off the first phase immediately and Mark began the (bring it up to Code phase) the following Monday in December 2024. Work began immediately and he moved his equipment into my carport and began working. I need not have worried about Mark and the process. He did a great job from Day through the completion. Louis J Garday Sr. Pagosa Springs, CO 81147"
Louis
2025-12-23
"Mark remolded our home when we bought it to perfection!!! He built a corner fireplace; a new kitchen with built in cabinet with glass doors and lights for displays. We have the most amazing master bath as he built a round shower stall, walkin with 5 shower heads, a seat and all done in glass bricks. The window is all glass bricks to let the light in with an open small window at the top to let steam out and fresh air in if wanted. A beautiful tile inlaid floor rhat is heated as wanted that he designed. Many people have come to look at it and he built several more!! He comes to fix anything or make something better when ever he is needed. He builds remarkable original things which he designs to fit the space and to last for ever! He is an artist and a very talented guy!!! I would not have anyone else do the kind of work Mark does!! Leslie Hawkinson"
Leslie
2025-12-12
"Mark of Positive Design Build did a total remodel on a rental property I own. The property was rented for over 13 yrs to the former tenant and it was sorely in need of repairs & overall updating. He did a fabulous job & it looked like a new home!! All new kitchen, new wiring, a lot of new plumbing, new bathroom tub surround, new vanity & lighting , all new paint, floors refinished & new door locks & some new doors for closets & exterior doors. I was very pleased with his hard work & the finished project."
Kelly
2025-12-16
"Mark did a great job!!! He brought creativity and imagination to a job , where I did not see the possibilities. His experience added great skill and forethought in to designing my mudroom and bathroom. I highly recommend Mark Posiviata for whatever you need to do...."
Bill
2025-12-28
"4.5 stars - Mark Posiviata at Positive Design Build LLC did a beautiful job designing and building my laundry/mudroom. The cabinets, bench, and countertop are absolutely stunning, and the craftsmanship is truly top-notch. The quality of work and attention to detail really show — the space is both functional and gorgeous. Design-wise, Mark was excellent to work with. He listened carefully, offered great ideas/suggestions, and delivered a final result that exceeded my expectations. I’m thrilled with how the room turned out and receive compliments on it all the time. The only area for slight improvement would be communication and coordination with contractors during the process, which could have been smoother at times. That said, the end result was well worth it. I would absolutely recommend Mark and Positive Design Build LLC for anyone looking for high-quality custom work and thoughtful design."
Jules
2025-12-05
Passive House Design Questions
Is passive house worth it in Colorado?
Absolutely — Colorado's extreme temperature swings make passive house design one of the smartest investments you can make. In La Plata and Archuleta Counties, winter nights drop well below zero while summer days climb into the 90s. A passive house envelope handles those swings without oversized HVAC, cutting energy bills by up to 90%. Our clients in Durango and Pagosa Springs report heating costs under $200 per year, plus the interior stays a consistent 68–72°F in every room, every season.
How much does passive house certification cost?
Certification through PHIUS (Passive House Institute US) typically adds $15,000–$30,000 to a project in Southwest Colorado, covering energy modeling, consultant fees, and mandatory blower-door and ventilation commissioning testing. The PHI (European standard) certification runs slightly higher due to stricter airtightness targets. We guide clients through the full PHIUS process and handle the energy modeling in-house, which keeps consultant costs lower than working with a third-party firm.
Do passive houses have heating systems?
Yes, but they're dramatically smaller than conventional systems. A passive house in Durango might use a single mini-split heat pump for the entire home — sometimes just a 9,000 BTU unit for a 2,000-square-foot house. The superinsulated envelope and ERV system retain so much heat from occupants, appliances, and solar gain that the backup system barely runs. Several of our Pagosa Springs passive house plans use a small wood stove as the sole backup, which owners love on snowy evenings.
How does a passive house handle mountain wildfire smoke?
This is where passive house design really proves its value in Colorado. The airtight building envelope — tested to 0.6 ACH50 or better — means smoke cannot infiltrate through walls, windows, or roof assemblies. All fresh air enters through the ERV system, which we equip with MERV-16 or HEPA filtration. During the 2024 wildfire season, our clients in Archuleta County reported clean indoor air quality readings while neighbors were sealing windows with tape.
How do you design for passive solar gain in Durango?
Durango gets over 300 days of sunshine per year, making passive solar design incredibly effective here. We orient the primary glazing within 15 degrees of true south to maximize winter solar gain, then engineer roof overhangs calculated to the 37°N latitude to block summer sun while allowing the low winter sun to penetrate. Thermal mass elements — concrete slab floors or interior stone walls — absorb heat during the day and release it through the night, reducing heating loads by 30–40% before the envelope even factors in.
What is the difference between Net Zero and Passive House?
Passive House is an efficiency-first standard — it minimizes the energy a building needs through insulation, airtightness, and heat recovery. Net Zero means a building produces as much energy as it consumes, usually through solar panels. You can have a poorly insulated Net Zero home that needs a massive solar array to offset high consumption. We recommend the passive house approach first: reduce demand by 80–90%, then add a modest solar system to reach Net Zero. It's a more resilient, cost-effective path, especially at Colorado's high altitude where heating loads dominate.
Are passive house plans more expensive?
Passive house plans typically cost 10–15% more than conventional construction plans due to detailed thermal bridge analysis, WUFI hygrothermal modeling, and precision detailing at every junction. However, the long-term ROI is substantial: mechanical systems cost less, energy bills drop by 80–90%, and resale value increases significantly. On our recent projects in Bayfield and Pagosa Springs, clients have recouped the design premium within 5–7 years through energy savings alone.
Can you build a timber frame passive house?
Yes — we've completed several timber frame passive houses in Southwest Colorado using hybrid structural systems. The timber frame provides the aesthetic and structural skeleton, while a continuous SIPs (Structural Insulated Panel) or exterior mineral wool wrap creates the unbroken thermal envelope required for passive house certification. The key is airtight detailing at every timber-to-panel connection, which we manage with European-grade tapes and membranes. The result is a home that looks like a classic Colorado timber lodge but performs like a thermos.
Still have questions?
We're here to help you find the answers.
Start Your Passive House Journey
Whether you're planning a new build or exploring a deep energy retrofit, we'll help you understand the costs, timeline, and performance benefits of passive house design for your Southwest Colorado property.