Louisville - Marshall Net Zero
Address: 1115 W Enclave Circle Louisville CO 80027
Architect: Baseline Design Studio
Baseline Design Studio
An architectural design firm in Lafayette, Colorado founded by Juta & Kim Cinco, specializing in contemporary residential design. We focus on creating a thoughtful sense of place with conceptual clarity, and on designing high-performing and resilient buildings. We prioritize team collaboration and are passionate about designing spaces that people love.
Builder: Hammerwell
Structural: MC Squared
MEP: Bright Sense/NOCO Energy Solutions
PV: Buglet Solar Electric
PassiveHouse: Home Energy Services
Owners: Susan Nedell & Malcolm Fleming
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SUMMARY
Built: 2024
Size: 3,992-SF
Budget: Not disclosed
Type: New construction
Performance: All Electric, PHI Plus
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NARRATIVE
This project, completed in 2024, is Certified Passive House (PHI Plus). It is a new house for a family who lost their home in the Marshall Fire, a devastating fire that burned more than a thousand homes in Boulder County, Colorado, on December 30, 2021.
Sustainability and resilience are fundamental drivers of the design. The house is constructed with prefabricated structurally insulated panels from B.Public Prefab. The 14" thick, heavily insulated panels provide an insulation value of R-52 on the walls and R-59 on the roofs.
The house's design celebrates the thick walls with massing and material choices that nod to southwestern-style adobe houses, a typology that the owners particularly like. Clerestory windows and large glazed openings juxtapose the heaviness of the thick walls, flooding the home with light and opening it to mountain views.
The house is an all-electric, net-zero, Certified Passive House. It uses heat pump technology for heating and cooling (albeit low loads, given the insulation and air-tightness of the envelope), water heating, and an ERV system for natural ventilation. It includes PV panels and electric car charging, prioritizing environmentally responsible companies and material selections.
The Passive construction, clearstory windows, 8kW PV and 10kWh battery backup enabled the house to achieve net production of 607kWh from 8/1/2025-7/31/2026. That results in extremely low electric bills; all heating, cooling, hot water, charging two cars, and all other electric use cost a total of only $292.00 for the entire year (with most of that being Xcel Energy’s Service and Facility charges). In summer, the house stays at our comfortable setting of 73 degrees, even in recent 100 degree days, and in winter, it never goes below 68, even when below zero outside. Further, in the winter sun, the house warms to the mid-70s without the heat pump even coming on.
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MATERIALS & CONSERVATION
Fire resilient features: Non-combustible exterior materials (corrugated metal roof, fiber cement cladding panels, cementitious stucco, fiber-laminate accent siding planks). Minimized envelope penetrations (ventless dryer, recirculating kitchen hood, passive ventilation plumbing vent, unvented roof assembly and no eaves).
Materials: Prioritizes environmentally responsible companies and material selections. Includes: stucco, fiber-cement cladding, metal and EPDM roofing, wood, cork, clay tile.
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SPECIFICATIONS
WINDOWS
Spec: Viking SW14 / U Factor: 0.12 (avg)
ENVELOPE + INSULATION
Airtightness: 0.38ACH50 w/ Pro Clima
Slab: R-22 Atlas Geofoam EPS29
Wall underground: R-17 Atlas Geofoam EPS29
Wall aboveground: R-52 Dense-pack Cellulose
Roof: R-59 Dense-pack Cellulose
MECHANICAL
Heat Pump: Mitsubishi PUZ-HA36NKA
ERV: Brink Flair 400 ERV
Water heater: Rheem heat pump
ON-SITE RENEWABLES
PV: 8kW with 10kW whole-house battery backup
OTHER GREEN FEATURES
Induction Cooktop
EV Charging
Drip irrigated landscaping, including underground Netafim drip tubing for lawn.
Thank you!
