If you live in England and Wales, conservatories are usually exempt from building regulations. As a general rule to qualify for this exemption, your conservatory should meet the following criteria laid out under the 1991 Building Regulations:
- The extension has a completely transparent or translucent roof.
- The extension's walls are substantially glazed (no more than 25% of its wall area should be brickwork).
- The extension has a floor area not exceeding 30m2.
- The extension is sited at ground level.
- The conservatory is separated from the house by external quality door(s).
- Glazing and any fixed electrical installations comply with the applicable building regulations requirements.
Disclaimer: This is an introductory guide and is not a definitive source of legal information. You should contact your local planning and building authority before undertaking any work.
You can also visit Direct Gov for further information.