How We Build Sustainably
We use responsibly sourced materials, keep waste low, and build annexes that are cheap to heat. Here's how that works in practice.
Materials and Methods
The annexes we build will be homes for decades. We use sustainably sourced materials, manufacture efficiently in our workshop, and design for low energy consumption over the building's lifetime.
This isn't a bolt-on. Material selection, construction methods, and energy performance are all part of the same process.
95%+
EPC Rating
FSC
Certified Timber
<2%
Timber Waste
Zero
Concrete Spoil
Sustainable Materials
What we use and why.
FSC & PEFC Certified Timber
95% of our timber comes from FSC or PEFC certified sources. These certifications ensure forests are responsibly managed and replenished.
- Sustainable forestry practices
- Chain of custody verified
- Carbon-negative material
Recycled & Recyclable Materials
Where possible, we use recycled materials. Our composite decking, for example, is made from almost entirely recycled content.
- Recycled composite decking
- Recyclable packaging
- Long-lasting materials
High-Performance Insulation
Our 250mm WarmWall insulation significantly reduces energy consumption over the building's lifetime.
- Low U-values (0.15 for walls)
- Reduced heating demand
- Long lifespan insulation
Minimal Waste Manufacturing
Building in our workshop rather than on site means precision cutting, less material waste, and fewer errors. Offcuts are repurposed or recycled.
Less Than 2% Timber Waste
Offcuts are repurposed for smaller components or recycled
Controlled Factory Environment
Precision manufacturing reduces errors and waste
Efficient Deliveries
Consolidated deliveries reduce transport emissions
Built for Low Energy Living
Most of a building's environmental impact comes from the energy it uses over its lifetime. We design to keep that as low as possible.
Thermal Performance
Our WarmWall system keeps heat in during winter and out during summer, which means less energy for heating and cooling.
- 250mm insulated walls (U-value 0.15)
- 200mm insulated roof
- Insulated floor construction
- High-performance glazing
- Airtight construction
Energy-Efficient Features
Standard features that reduce energy use and running costs.
- LED lighting throughout (90% more efficient)
- Efficient electric heating with smart controls
- A-rated appliances available
- Solar panel packages available
- Low-flow water fixtures
95%+ EPC Environmental Impact Rating
This means lower energy bills and a smaller carbon footprint for the lifetime of the building.
On-Site Practices
Screw Pile Foundations
Where ground conditions allow, we use screw pile foundations. These cause minimal ground disturbance, produce zero concrete waste, and avoid damage to tree roots. They can also be removed if ever needed.
Wildlife Consideration
Our planning process accounts for protected trees, hedgerows, nesting birds, and other wildlife on your site.
Responsible Water Management
All our builds comply with regulations for safe discharge of waste and surface water. We can also install rainwater collection systems for garden irrigation.
Minimised Site Traffic
Off-site manufacturing means most work happens in our facility, not your garden. This reduces site traffic, noise, and emissions from machinery and vehicles.
Solar Panel Packages
Add solar panels to your annexe to generate your own electricity and reduce running costs further.
Ask about our solar packages during your consultation. We'll assess your roof orientation and advise on the best setup.
Solar Ready
All annexes can accommodate solar panels
Want to Know More?
We're happy to answer questions about materials, energy performance, or anything else.