Conservatory Cost Calculator UK 2026
Calculate the cost of a conservatory or garden room and how much value it could add to your property. Compare uPVC, aluminium and timber conservatory prices.
Conservatory Cost & Added Value Calculator
Frequently Asked Questions
How much does a conservatory cost in the UK in 2026?
A uPVC conservatory costs approximately £8,000–£15,000 for a small (3×3m) unit and £15,000–£25,000 for a medium (4×4m). Aluminium frames add around 30% to the cost; timber adds 40%. An orangery or glazed extension typically costs 50% more than an equivalent uPVC conservatory. Prices vary significantly by region: London installations can be 30% above national averages. Installation by a contractor typically adds 20–30% over self-build kit prices.
Does a conservatory add value to a UK home?
A well-built, properly insulated conservatory typically adds 5–7% to a property's value in the UK. On a £350,000 home that equates to £17,500–£24,500. However, a poorly built or underinsulated conservatory may actually reduce value if it is too cold in winter or too hot in summer. Estate agents note that a high-quality glazed extension or orangery (with proper insulation and underfloor heating) adds proportionally more value than a basic uPVC conservatory.
Do I need planning permission for a conservatory?
Most conservatories fall under permitted development rights and do not require planning permission, provided they: do not exceed 50% of the garden area around the original house; are not forward of the principal elevation (i.e. not facing the main road); are single-storey with a maximum height of 4m (3m within 2m of the boundary); and the roof is more than 75% translucent glazing. If you live in a listed building, conservation area or national park, you will likely need planning permission regardless of size.
uPVC vs aluminium conservatory — which is better?
uPVC is the cheaper option (£8k–£25k typical) and is low-maintenance, but is available in fewer colours and has a more traditional appearance. Aluminium is around 30% more expensive but offers slimmer profiles (more glass, more light), greater strength, a wider colour palette, and tends to look more contemporary. Aluminium is also more durable over the long term — 40–50 years versus 20–35 for uPVC. For a modern home or if aesthetics are important, aluminium is generally preferred by architects and estate agents.
How long does a conservatory last?
A uPVC conservatory typically lasts 20–35 years before requiring significant replacement. Aluminium conservatories can last 40–50+ years with minimal maintenance. The glazing units (double or triple glazed panels) may need replacing after 15–20 years if they mist up. The roof — particularly polycarbonate panels — may need replacing after 10–15 years, which is one reason why glass roofs or tiled roof conversions are increasingly popular upgrades.