The Bio Twin Wall System from Sydenhams Timber Engineering combines high performance with natural, renewable materials. With BOPAS accreditation and REI 60 fire certification, it removes key barriers to offsite timber construction and offers an attractive, mortgageable alternative to traditional cavity wall systems.
BOPAS-accredited, REI 60 fire certified, and STA Gold status. Our system meets strict performance and warranty standards, giving full assurance to lenders, insurers & building control teams.
With UK-grown hemp insulation and timber frame construction, the system stores more carbon than it emits - helping projects meet low-carbon targets from day one.
Designed for open or closed panel delivery, with options for manual or crane installation. Manufactured off-site to significantly reduce construction periods, with flexible cladding system options.
Our system meets rigorous industry standards for fire safety, durability, structural integrity and mortgage acceptance, backed by leading accreditations from BOPAS and STA assure gold.
Tested to REI 60 from both sides, giving full assurance for Building Control and on-site safety requirements.
Our Bio Twin Wall System is fully approved for lenders, insurers and warranty providers.
Manufactured using timber and insulated with UK-grown hemp (alternatives available), designed to store more CO₂ than emitted during production and transport.
Compatible with a wide range of cladding options - including timber, render, brick and composite finishes.
This system is already being installed in flagship low-carbon developments. You can browse some examples below.
With 25+ years of timber frame experience and over 4,000 homes delivered across the UK, we combine trusted expertise with a long-term sustainability mission: to become the UK’s key provider of net zero timber frames by 2030.
We’ve supplied thousands of homes across the UK, including over 60% of all new housing on the Isle of Wight in last 20 years.
Our CAD/CAM production ensures what’s drawn is exactly what’s delivered; with tight tolerances and repeatable quality.
From digital twins to AR-guided installation, we invest in tools and ideas that make low carbon construction easier to adopt and scale in your project.
We work closely with architects, developers and public sector clients to simplify build programmes and support better project outcomes.
We prioritise renewable materials, UK-grown insulation, and smart manufacturing to reduce embodied carbon. From hemp to timber, every layer of the system is chosen to store more carbon than it emits – helping you meet sustainability targets with confidence.
Bridge House demonstrates how fabric-first design, low embodied carbon materials and on-site renewables can combine to create a net zero operational home. Built using the Bio Twin Wall system, the project delivers high performance, long-term durability and measurable carbon reduction.
At Nansledan in Newquay, Morrish Homes has delivered its first net zero ready semi-detached houses. Built using the Bio Twin Wall system and hemp insulation, the EPC A-rated homes combine reduced embodied carbon, passive house levels of airtightness and integrated renewable technology.
A new supported housing scheme in Newquay will provide high quality homes for people experiencing homelessness. Built to low carbon standards, the development uses the Bio Twin Wall system with UK-grown hemp insulation to create durable, energy efficient homes.
