Do conservatory roof replacements need Building Regs?
Yes. Replacing a translucent (polycarbonate or glass) roof with an opaque solid roof changes the thermal and structural classification of the room. It's a notifiable change in England and Wales, and the work must comply with current Building Regulations — specifically Part L (conservation of fuel and power) and Part A (structure).
Part L — thermal performance
Part L sets the minimum U-value (heat loss) the new roof must achieve. A modern \n reaches 0.15–0.18 W/m²K, comfortably exceeding the requirement. The installer must show this calculation in the application to Local Authority Building Control (LABC).
Part A — structural
Part A requires that the existing conservatory frame, dwarf walls and base can safely support the new roof. Modern lightweight composite tiles weigh a fraction of clay or slate, and the engineered aluminium structure is designed specifically for conservatory frames — so reinforcement is rarely needed, but the survey confirms it before quoting.
Who arranges Building Control?
A reputable installer arranges everything: the application, the inspections during the build, and the final sign-off. \n installations include LABC sign-off as standard — never as an optional extra. Walk away from any quote that excludes it.
What certificate should I receive?
On completion you should receive a Building Regulations completion certificate from your local council. Keep it filed safely — your solicitor will want to see it when you sell the house. Without it, surveyors may flag the roof as unauthorised work and lenders may request retrospective approval.
Do I need planning permission as well?
In nearly all cases, no. A like-for-like roof replacement on an existing conservatory normally falls under permitted development in England and Wales, provided you don't increase footprint or height. Listed buildings and conservation areas are the main exceptions — your installer will flag them at survey.