The high-performance closed-panel timber frame system engineered for the future of UK housebuilding.
Sigma® Zero combines speed, quality and sustainability, delivering faster build times, measurable performance and lower carbon, without compromise.
Factory-finished for precision, each panel arrives ready to install with insulation, membranes and service zones pre-fitted, cutting waste, labour and prelims while achieving airtightness below 3 m³/h·m², U-values down to 0.12 W/m²K, and a certified 60-year design life.
Backed by NHBC Accepts, BOPAS+, BBA and STA Gold accreditations, Sigma II offers complete confidence in performance and compliance.
Built on over 50 years of Donaldson Timber Systems expertise, Sigma II delivers:
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Faster programmes: weathertight in half the time of masonry.
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Smarter delivery: reduced site labour, storage and supervision.
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Better outcomes: verified PMV 55–58%, lower embodied carbon, higher energy efficiency.
Supported by local installation teams and offsite automation, Sigma II is the intelligent choice for housebuilders and contractors who need to meet today’s standards and tomorrow’s carbon targets efficiently, reliably and sustainably.
The benefits
High-performance building, without compromise.
Sigma Zero is a high-performance, closed-panel timber frame system, engineered to deliver net zero ready homes with speed, certainty and consistency, without adding complexity to design, manufacture or installation.
Built for today’s regulatory demands and tomorrow’s performance expectations, Sigma Zero combines precision offsite manufacture with a practical, delivery-focused approach that gives customers confidence from first project to full rollout.
The demands placed on new homes are increasing rapidly:
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Higher fabric performance
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Lower embodied and operational carbon
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Greater programme certainty
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Fewer skilled trades available on site
For many housebuilders and affordable housing providers, the challenge isn’t ambition. It’s how to deliver higher performance without increasing risk or exceeding budgets. Sigma Zero was developed to solve that problem.
What makes Sigma Zero different
High performance, engineered in.
Sigma Zero is designed to support excellent thermal performance, airtightness and fabric efficiency helping projects meet current and future standards without relying on site based solutions.
Manufactured in controlled conditions, Sigma Zero delivers consistent quality, reduced variability and predictable outcomes.
Closed panel construction accelerates the journey to weathertight, reducing exposure to weather, labour availability and site disruption.
Sigma Zero aligns with MMC requirements and is well suited to projects supported by Homes England.
Sigma Zero has been developed to work within real construction programmes, commercial constraints and site conditions.
Who is it for
Sigma® Zero is ideal for:
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Private housebuilders of all sizes from smaller bespoke developments to large scale schemes
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Affordable housing providers, Local Councils and contractors building varied affordable homes, aiming to achieve high performance standards
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First-time timber frame users
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Customers moving into higher performance / net zero projects
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Customers worried about lack of skills, lengthy programmes or risk
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Build-to-rent and partnership delivery
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Apartments and multi-unit dwellings
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Education, care, and community buildings requiring high energy performance
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Mixed-tenure sites targeting MMC and sustainability benchmarks
Sigma® Zero by Donaldson Timber Systems: proven, accredited, and engineered for the future of offsite timber frame construction.
Fire and acoustic performance
Sigma® II is available with 30-minute and 60-minute fire-rated wall build-ups.
Acoustic performance is verified in accordance with Approved Document E, providing robust separation and compliance for party-wall configurations.
Fire-rated solutions are achieved through enhanced sheathing materials and detailing around junctions, openings, and service zones.
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