Bioregional Construction: Do European Lessons Apply to Canada?

August 21, 2026

By Denis Koshelev

Canadian construction could be on the verge of a revolution. Things are set in motion, especially when it comes to new materials — or, more precisely, old materials. Inspired by Europe and its innovative new buildings, Canadians are starting to take an interest in local wood, clay and straw.

Proponents see these materials as key instruments in battling the twin crises of housing affordability and climate change. The core idea is a fundamental shift from fossil-fuel-intensive supply chains to locally sourced materials. Yet as Canada grapples with a housing shortage requiring 3.5 million new homes by 2030, a critical question emerges: can bioregionalism – a philosophy proposing that human societies and economies are most sustainable when organized around naturally defined geographic areas rather than political borders – scale from niche philosophy to mainstream practice? (Canada Mortgage and Housing Corporation, 2023)

What’s Old Is New Again: Taking Inspiration from Europe

Bioregional construction — materials sourced and processed within a region to cut transport, support local economies, and reduce embodied carbon — has deep roots in European building traditions, and that’s where many draw inspiration. Countries like Germany and Austria lead the way in prefabricated passive houses with wood frames, straw insulation and clay plasters.

The idea, says Joakim Kaminsky, the founder of Kaminsky Arkitektur from Gothenburg, is to avoid steel, plaster, and concrete and instead work with wood, clay and straw. (Fock, 2024) His company was the first in Sweden to design an apartment building with walls made of unfired clay (earth-based building materials that are air-dried). In Mallorca, projects integrate traditional techniques that mix clay, wood, and straw. (Munarq, 2024) Austria, Czechia, and many other countries already have multi-family housing projects using straw.

There’s a palpable uptick in interest for what had been seen as relics of the past — straw, clay and even seaweed are being used in construction, creating not only energy-efficient, but also aesthetically pleasing homes. [25]

There are many other inspiring examples. In Spain, there’s the 21st Century Vernacular House in Ayerbe, built almost completely from local materials, with only 20% imported.

Vernacular House, Ayerbe, Spain

In France, RFCP (Réseau Français de la Construction Paille) is actively promoting standards for straw construction. There’s an ongoing revival of “torchis,” the traditional technique of building using a mixture of water, clay, and natural fibres. (Le Fur, 2025) In Alsace, a 120 m² straw home was recently built, costing €170,000. (Garcia, 2025)

In the UK, prefabricated homes (homes manufactured off-site in advance) are all the rage. Companies like ModCell and EcoCocon use prefabricated straw bale panels in major projects. These panels are Passivhaus-certified, meaning they comply with stringent energy-efficiency standards. (Baraniuk, 2024) They are also surprisingly fire-resistant, achieving REI ratings of 45 to 120 (European fire resistance rating system). (Ecological Building Systems, n.d.; Earth Bound Homes, 2025)

The Canadian Movement Takes Root

Ryan McClanaghan, architect and associate at DIALOG, took these European lessons to heart. The winner of the 2023 Iris Prize, he travelled across the old world studying bioregional design in Germany, Switzerland and Belgium. These countries share some of Canada’s climate and economic conditions and have already found solutions. Danish thatched roofs backed by contemporary science, Brussels converting construction waste into earth blocks, and Basel's Herzog & de Meuron designing HORTUS, a five-story building using rammed earth, wood, and cellulose designed to achieve net energy-positive status within 31 years. (Choi, 2025; McClanaghan, 2025)

In British Columbia, McClanaghan created a demonstration wall and floor assembly from materials found in BC — timber, cellulose, wood fibre, earth, etc. His prototype generates only one-third the embodied carbon of traditional steel stud walls while improving thermal performance by 20 percent. The concept is compelling: abundant local materials, drastically reduced transportation emissions, carbon sequestration during plant growth, and support for regional economies.

Photo credit: MGA | Michael Green Architecture

He’s far from being the only one in this movement: The University of Toronto's Daniels Faculty now includes bioregional approaches in its curriculum. Research networks are emerging across provinces, connecting practitioners from British Columbia to Ontario who work with straw bales, hempcrete, and light-clay-straw construction. (Ecohome, 2025; University of Toronto, John H. Daniels Faculty of Architecture, Landscape, and Design, 2024) In Alberta, an Indigenous-owned company called Asinikahtamwak now has a hemp block manufacturing plant in Elk Point, producing 250 bio-fibre blocks per day with plans to scale up.

It’s still early days, but the Canadian bioregional sector is expected to grow in the coming years. Thanks to new pockets of innovation, the market is projected to grow from USD 210 million in 2025 to USD 1.06 billion by 2031. (Mobility Foresights, 2025)

Material Performance: Evidence from Research and Practice

The technical viability of natural materials is increasingly well documented. Straw bale construction delivers thermal conductivity ranging from 0.033 to 0.19 W/(m·K), with U-values between 0.11 and 0.28 W/m²K (Tlaiji et al., 2022). At 400mm thickness, straw bale walls achieve U-values of 0.13 W/m²K. (Cassels, 2014) Battle Lake Design Group and researcher Habib John Gonzalez have worked together since 2004 to perfect the straw bale construction, focusing specifically on Alberta’s harsh climate. As a result, many building inspectors accept it as a viable material.

Hempcrete shows promise as well. With an embodied carbon figure of -35 kgCO₂/m³ compared to straw bales at -135 kgCO₂/m³, both materials are carbon-negative—sequestering more CO₂ during plant growth than is emitted during processing, transportation, and installation. Hemp-clay composites, which replace lime binders with clay, achieve -196 kgCO₂/m³, dramatically outperforming conventional materials. Research from Western Australia found that hemp-based boards exhibit 164 percent lower carbon footprint than gypsum plasterboards. (Busbridge & Rhydwen, 2010; Cassels, 2014)

Light-straw-clay construction offers ductility valuable for seismic activity, with compression results of 11.9 psi at 5 percent strain and bend strength of 34 psi. The material's hygroscopic properties—absorbing and releasing moisture without degrading — help regulate indoor humidity while maintaining insulation qualities. (Natural Building Alliance, 2022)

Life cycle assessments consistently demonstrate advantages. A comparative study of three building variants — autoclaved aerated concrete, wooden frame with mineral wool, and straw-bale construction — found that straw-bale significantly reduced embodied energy and embodied carbon over a 40-year lifecycle. A Swedish study of a refugee house using local straw, reeds, wood, and clay achieved a negative carbon impact of -226.2 kg CO₂ eq/m², even when factoring in the full lifecycle. (Dabaieh et al., 2020; Węglarz & Pierzchalski, 2018)

Wikipedia Commons

The study of Ashley Lubyk showed that straw bale wall assemblies were able to meet PHIUS 2015 Passive House standards for each of the three Western Canadian locations where they were tested — Kelowna, Calgary and Saskatoon. The proposed wall assembly was able to meet the peak demand limits and came in below annual demand limits by 4%, 63.1% and 63.1% respectively. The successful achievement of these results also addressed several climate objectives since the use of straw bales as an agricultural by-product has a very low embodied energy and can be used to sequester atmospheric CO2 from buildings as opposed to the front-loaded greenhouse gas emissions associated with super-insulated buildings. (Lubyk, 2018)

One question remains: availability. Thankfully, the agricultural sector in Canada produces enough wheat, oat and barley straw as byproducts in many provinces (McKnight, 2024). Just a fraction of Canada’s annual straw production can offset a significant amount of building material, sequestering carbon and reducing waste.

The Regulatory and Production Landscape: Progress and Barriers

It’s promising, and it works, but there are still many obstacles, the main one being the building code. Despite straw bale and light-straw-clay construction being fully codified in the International Residential Code (IRC) (Nartker, 2025), it’s still nowhere to be found in Canada’s National Building Code. That means there’s always tension: while some building inspectors embrace natural materials, others remain unconvinced.

This is a big contrast with the United States, where the International Residential Code has included straw bale-specific provisions in Appendix BJ since 2015. (Nartker, 2025) Things change slowly: Ontario's 2025 Advanced Wood Construction Action Plan is one such positive note, minor as it is. Another sign of the changing times is the Canada Green Buildings Strategy, which recognizes this gap, though implementation timelines extend beyond immediate housing needs. (Ontario Natural Building Coalition, n.d.) Curiously, in New Brunswick, people in rural areas can construct a small personal residence without having to meet building codes (Regulation 2021-02, clause 8). (Southwest New Brunswick Service Commission, 2024)

Regulations are one problem; another is potential scalability. Can bioregionalism scale up to meet the ever-growing housing demands in Canada? Currently, a scale-up is feasible with factory-based production, at least according to McClanaghan. After all, mass timber companies already own forestry plots and mills — why not use this model with other bioregional materials? (Choi, 2025) Progress is slow, and even mass timber is not a fairy tale story yet: products such as CLT panels are still being imported en masse from Europe rather than Canadian manufacturers. (Transition Accelerator et al., 2024) Still, domestic capacity has grown; lessons from that build-out can inform bio-based panels.

One thing mass timber has on its side is the known knowledge transfer mechanisms like government-funded demonstration projects (such as Green Construction through Wood (GCWood) Program [Natural Resources Canada, 2025], NRCan’s Tall Wood Building Demonstration Initiative [Natural Resources Canada, 2021], etc.) and collaboration projects with Europe. Things are slowly changing, though, albeit not without help from Europe. For example, the INGUMA project (INGUMA, 2025) is a European-funded research initiative focused on developing and promoting bio-based materials, particularly wood, for sustainable construction. It brings together international experts, including Canadian partners like Laval University and prefabricated housing manufacturer Maison Laprise,

Can — and should — Canada follow suit?

Europe presents a lot of compelling lessons, but is it possible for Canada to follow suit with its extreme climate and rigid regulatory framework?

An easy answer is not an option, but straw bale and light straw-clay have demonstrated excellent performance both in the mild BC climate and severe winters of the Prairies. A study by Canada Mortgage and Housing Corporation (CMHC) has confirmed that Straw Light Clay (SLC) is incredibly fire-resistant and showcases impressive thermal properties. (Thornton, 2010)

The issue might not be fire-resistance; it’s the opposite, although even then, the problem isn't the material itself, but the design: according to the Pilot Study of Moisture Control in Stuccoed Straw Bale Walls research, field testing has shown that six out of nine houses (67%) passed with acceptable moisture readings, but two houses showed borderline to unacceptable conditions due to minimal overhangs, no capillary breaks and other design flaws. That might mean that while straw bale construction is ill-fitted for high-humidity and precipitation climates, it can work in northern climates if used with adequate roof overhangs. A British Columbia coastal project documented by Natural Building Blog in 2024 reported that straw-clay walls take about two months to dry on the coast, which is challenging given the relatively short dry season Canada Mortgage and Housing Corporation, 2007; Hart, 2024)

Northeastern China research on straw bale walls in a warm, humid continental climate—similar to parts of Ontario and Quebec—found that straw inside walls showed no serious degradation concerns except for moderate concerns 2 to 3 centimetres deep behind lime render. The research developed prediction models for straw degradation that can help builders assess long-term durability. [34] The Prairie provinces with abundant straw and relatively dry climates seem perfect for this revolution. But European lessons on breathing walls, vapour permeability, and humidity regulation remain highly relevant for all Canadian provinces.

Things need to change, and it’s hard not to get optimistic while looking at Europe or even the McClanaghan demonstrations. But, as it usually happens, Canada moves slowly, and for now, the progress has been small. Still, construction changes are inevitable: we are seeing it with mass timber. The bioregional sector is expected to grow. With more pockets of innovation every year, the future is looking up.

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