SIP Range
Birch
Extended duo-pitch annexe with full self-contained living potential — multiple internal rooms.
Birch is an extended duo-pitch annexe designed for genuine day-to-day living. The long footprint allows for separate zones - sleeping, living and shower room - within one eco-friendly SIP shell.
- Roof type
- Duo-pitch
- Footprint
- From 2.6 × 6.2m
- Floor area
- from 16.12 m²
- Best for
- Guest annexe, multi-generational living, long-stay accommodation
Available sizes
- 2.6m × 6.2m16.12 m²
- 3m × 6.2m18.6 m²
Every size can be tailored, and we build fully bespoke to your site and brief.
Key features
- Self-contained layout
- Multiple internal rooms
- Kitchenette and shower options
- Eco-friendly ground screw foundations
- Eco-friendly roof options and responsibly sourced materials
- Full electrical package, lighting and heating options
Technical specification
Wall U-value
0.34 W/m²K
Exceeds Building Regulations
Roof U-value
0.26 W/m²K
Superior thermal performance
Panel thickness
97mm / 122mm
High-performance insulated core
Compliance
Part L compliant
UK Building Regulations
Air tightness
< 1 m³/hr/m²
At 50 Pascals
Installation
2–5 days
Professionally installed on site
Other designs in the range
Hazel
Mono-pitchCompact mono-pitch design, perfect for home offices and small studios. Clean lines with a contemporary aesthetic.
Willow
Mono-pitchWide mono-pitch with side entry. Perfect for art studios or yoga spaces — optimised for natural light.
Alder
L-shapedExtended L-shape for larger corner plots — multiple zones and a footprint optimised for character sites.
Start your project