In 40 seconds
A popular-size aluminium greenhouse in the UK (around 8x6) typically costs roughly £500–£1,500+ for the structure, with professional installation usually adding about £200–£500 and a base another £150–£800 depending on type and size. Glazing is a key choice: glass transmits more light and looks traditional, while polycarbonate insulates better and resists impact. On the frame, aluminium is the lower-priced, low-maintenance default, while wooden frames cost more and need upkeep but retain heat well and suit period gardens. For most gardens a domestic greenhouse is permitted development and needs no planning permission, provided it sits behind the house, stays under the height limits near a boundary, and does not cover more than half the garden. The honest answer is always a range, because it depends on size, frame, glazing and your site.
Most greenhouse guidance is published by firms selling them, so the numbers tend to be optimistic and the rules glossed over. The pages below give sourced cost ranges, set out what a base really costs, compare the glazing and frame options fairly, and explain the permitted-development planning rules — before you take a single quote.