How Our Annexes Are Built
250mm double-insulated walls, BS 3632 residential standards, and a 10-year structural guarantee. Here's what goes into the construction.
WarmWall™ Insulation System
Our WarmWall system uses 250mm thick walls with two layers of insulation. That's significantly thicker than most competitors, and it makes a real difference to heating bills.
Wall Construction (Outside In):
- 1External cladding (various finishes available)
- 2Breathable membrane
- 3First insulation layer (100mm)
- 4Structural timber frame
- 5Second insulation layer (150mm)
- 6Vapour barrier
- 7Internal plasterboard finish
Total wall thickness
Excellent thermal rating
Why Insulation Matters
For older residents especially, keeping a steady temperature is about health as much as comfort. Good insulation also keeps bills low.
Warm in Winter
Heat stays in. Even on the coldest days, minimal heating keeps the annexe comfortable.
Cool in Summer
Insulation works both ways. Heat stays out during hot weather.
Lower Bills
Better insulation = less energy needed = lower running costs.
Health Protection
Consistent temperature reduces health risks for elderly residents.
Built to BS 3632 Standards
Our annexes are constructed to BS 3632:2015, the British Standard for residential park homes. This ensures they're suitable for year-round permanent living, not just seasonal use.
Permanent Residential Standard
Designed for 365-day-a-year occupation, not summer-only use
Thermal Performance Tested
Exceeds minimum insulation requirements by significant margin
Structural Integrity
Engineered to withstand UK weather conditions for decades
Zero VAT Qualification
BS 3632 compliance enables Caravan Act zero VAT benefit
What's Included
Foundations
We assess your site and recommend the best foundation solution. Steel screw piles, concrete pads, or traditional strip foundations depending on ground conditions.
- Site-specific engineering
- Ground condition survey
- Level, stable base
Roof System
200mm insulated roof panels built to the same standard as our walls. Weatherproof and built to last.
- 200mm roof insulation
- EPDM or tile finish options
- Integrated guttering
Windows & Doors
High-performance double or triple glazed units. Thermally broken frames prevent cold bridging. Secure, draft-proof, and energy efficient.
- Double/triple glazing
- Multi-point locking
- Various style options
Electrics
Full electrical installation to Part P regulations. Consumer unit, lighting, sockets, and connection to mains supply all included.
- Certified installation
- LED lighting throughout
- TV/data points
Heating
Efficient electric heating systems sized for the insulation levels. Low running costs thanks to WarmWall performance.
- Electric panel heaters
- Programmable controls
- Underfloor heating option
Plumbing
Complete plumbing installation including hot water system, kitchen supply, and bathroom facilities. Connected to mains or drainage as required.
- Hot water cylinder
- Macerator if needed
- Quality fixtures
10-Year Structural Guarantee
Every annexe we build comes with a 10-year structural guarantee covering the main structure, weatherproofing, and workmanship.
Structural Integrity
Walls, roof, floor, and frame covered
Weather Protection
External cladding and roofing
Workmanship
Quality of construction
Want to See the Build Quality?
We can arrange a visit to a completed annexe so you can see the quality for yourself.