## Common ground
All options are types of caravan annexes based on their primary construction material.
## Options at a glance
**3926.90 – Plastic material**
- **Defining trait:** Constructed primarily from rigid or flexible plastic (e.g., PVC, polyethylene).
- **Typical examples:** Lightweight, foldable plastic sheds; waterproof side extensions with plastic frames.
- **Best fit when:** Durability in wet conditions and low weight are priorities; common for temporary or seasonal use.
**6307.90 – Textile material**
- **Defining trait:** Made from fabric (e.g., polyester, canvas) with a supporting frame or tension system.
- **Typical examples:** Tent-style annexes; roll-up textile extensions with zip doors.
- **Best fit when:** Portability, ease of setup, and low cost are key; often used for short trips.
**7610.90 – Aluminium**
- **Defining trait:** Built with aluminium frames and cladding, offering high strength-to-weight ratio.
- **Typical examples:** Rigid, semi-permanent annexes; high-end models with windows and insulation.
- **Best fit when:** Long-term use, weather resistance, and structural stability are essential.
## Key differences
| Feature | 3926.90 (Plastic) | 6307.90 (Textile) | 7610.90 (Aluminium) |
|------------------|-------------------|-------------------|---------------------|
| Material strength | Low to medium | Low | High |
| Weather resistance | Good | Moderate | Excellent |
| Portability | Medium | High | Low |
| Lifespan | Short to medium | Short | Long |
## How to choose
- Is the annex made mostly of fabric or flexible material? → 6307.90
- Does it use rigid plastic panels or a plastic frame? → 3926.90
- Is it built with metal (aluminium) frames and cladding? → 7610.90
## Overlaps & pitfalls
A caravan annex may combine materials (e.g., textile walls with an aluminium frame), which could fit both 6307.90 and 7610.90. In such cases, the **main structural material** determines the correct HS Code. If unclear, prioritize the **primary load-bearing or defining component**. Do not assume that a plastic roof on an aluminium frame defaults to 3926.90—aluminium frames dominate in classification