Choose what you want to build. Each guide covers typical sizes, costs and the UK installers who specialise in it.
A garden office is a fully insulated, year-round outbuilding designed as a permanent workspace at the bottom of your garden. Most are built under permitted development, fitted with power and data, and ready to use in 4–8 weeks.
£15,000–£35,000 · 8–20m²
Garden rooms are versatile insulated outbuildings used as offices, snugs, hobby spaces or guest rooms. Built to last 25+ years, they add usable square footage without the cost or disruption of a brick extension.
£18,000–£45,000 · 10–25m²
A garden studio is purpose-built for creative work — art, music, photography, yoga or therapy. Designs prioritise natural light, acoustic insulation and a calm, distraction-free environment.
£16,000–£38,000 · 10–20m²
Garden gyms are reinforced outbuildings designed to take heavy equipment, with rubber flooring, mirror walls, ventilation and high ceilings. A great way to reclaim space inside the house.
£17,000–£40,000 · 12–25m²
Dedicated garden cinema rooms feature blackout glazing, acoustic treatment, tiered seating and pre-wired AV. The ultimate weekend project for film fans short on indoor space.
£22,000–£50,000 · 12–20m²
Garden annexes (sometimes called granny annexes) include a kitchenette, bathroom and sleeping area for self-contained living. They typically need planning permission and full building regulations sign-off.
£45,000–£95,000 · 20–40m²