2026 buyer's guide
Polycarbonate vs solid conservatory roof
A solid conservatory roof outperforms polycarbonate on every meaningful measure — heat retention, noise, comfort and resale value. Polycarbonate is only cheaper on day one. This is the side-by-side comparison most homeowners ask us for.
| Feature | Polycarbonate roof | Solid (Smart-Roof) replacement |
|---|---|---|
| Typical U-value (heat loss) | 1.8–3.0 W/m²K | 0.15–0.18 W/m²K |
| Rain noise (heavy rain) | 70–85 dB (vacuum cleaner) | ≈ 35 dB (whisper) |
| Summer comfort | Often 35–45°C | Comfortable, room-temperature |
| Winter comfort | Cold, often unusable | Warm — usable every day |
| Lifespan | 5–10 years before yellowing & cracking | 30+ years |
| Building Regs U-value | Fails current standards | Meets / exceeds Part L |
| Effect on house value | Often valued at zero | Treated as a true extension |
| Typical cost (replace) | £1,500–£3,000 (like-for-like) | £6,500–£15,000 (full upgrade) |
Which is better, polycarbonate or solid roof?
A solid conservatory roof is the better choice for nearly every UK homeowner. Polycarbonate is around 10× worse at retaining heat (U-value 1.8–3.0 vs 0.15 W/m²K), gets unbearably noisy in heavy rain, overheats in summer and degrades within 5–10 years. A solid Smart-Roof costs more upfront but turns the conservatory into a year-round room and is treated as a genuine extension by valuers.
When does polycarbonate still make sense?
Only if you have an unheated, occasional-use garden room and an extreme budget constraint. Even then, glass is usually the better short-term fix. For any conservatory you actually want to use as living space — sitting room, dining room, snug, home office — a solid roof pays for itself in comfort and energy savings within a few years.
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