2026/27 STATUTORY & COST AUDIT • ICO REG ZC136598
Lightweight Tiled Warm Roof vs Solar Control Glass vs 35mm Polycarbonate (2026 UK Matrix)
Should I replace my conservatory roof with solid tiles or solar control glass?
A lightweight tiled warm roof (£340/m², U-value 0.15 W/m²K) reduces winter heat loss by 90% and eliminates summer greenhouse glare, turning the room into a year-round extension (requires £380 LABC sign-off). Solar control self-cleaning glass (£245/m², U-value 1.0 W/m²K) retains maximum sky light into the adjoining kitchen/diner and remains Building Regulations exempt as a translucent replacement.
| Performance Metric | Tiled Warm Roof (0.15 W/m²K) | Solar Control Glass (1.0 W/m²K) | 35mm Polycarbonate (1.6 W/m²K) |
|---|---|---|---|
| Installed Cost per m² (Roof Footprint) | £325 – £360 / m² | £230 – £265 / m² | £150 – £180 / m² |
| Winter Heat Loss U-Value | 0.15 W/m²K (Extension Grade) | 1.0 – 1.1 W/m²K (78% Solar Heat Rejection) | 1.6 – 2.4 W/m²K (High Heat Loss) |
| Heavy Rain Acoustic Noise | Silent (Insulated Plaster Vault) | Moderate | Loud Drumming Noise |
| LABC Building Control Certificate Needed? | Yes (£380 Mandatory for Solid Roofs) | No (Translucent Glazing Exemption) | No (Like-for-Like Exempt) |
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