In 40 seconds
A conservatory is a glazed, single-storey addition to a house with at least 75 % glazed roof and 50 % glazed walls — and it often qualifies for permitted development without planning permission, provided it meets size and location rules. Most conservatories under 30 m² are also exempt from Building Regulations Part L (energy efficiency), as long as they are thermally separated from the main house. A typical uPVC conservatory costs £8,000–£18,000 installed; aluminium conservatories run £14,000–£28,000+. An orangery — with its mostly solid walls and central glazed lantern — costs £20,000–£50,000+ and is generally better for year-round use. The single biggest comfort decision is the roof specification: solar-control glass with an SHGC below 0.3 and adequate ventilation are the key to avoiding the classic overheating problem. For any project, get at least three written quotes from FENSA-registered installers and check deposit insurance before committing.