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Bespoke composite garden rooms built in Marlow, Buckinghamshire. Garden offices, annexes, gyms & leisure rooms. Fully insulated, installed in under a week. Free consultation.

Looking for a premium garden room in Marlow? Garden Rooms Online designs, builds, and installs bespoke composite garden rooms across Marlow and the surrounding Buckinghamshire area. From our base in Flackwell Heath — just a few miles down the road — we've been building garden rooms for Marlow homeowners for years.
Marlow is a town that appreciates quality. From its riverside setting to its mix of period properties and contemporary new builds, Marlow homeowners want garden rooms that look the part and perform year-round. That's why our composite-clad, fully insulated garden rooms are a natural fit.
We build all our garden rooms with premium composite cladding — rot-proof, warp-proof, UV-stable, and maintenance-free. Combined with full insulation in the walls, floor, and roof, our rooms are genuinely usable 365 days a year, whether as a garden office, home gym, or self-contained annexe.
Our signature design named after the town — The Marlow is a contemporary garden room with clean lines, a flat roof, and bifold doors across the front elevation. Available in anthracite grey or warm oak composite cladding. Sizes from 3m x 3m to 6m x 4m.
See our full range of garden room designsWe cover all of Marlow (SL7) and nearby areas including Marlow Bottom, Bisham, Little Marlow, Harleyford, and Lower Bisham. Being based in Flackwell Heath means we're close by — typically on-site within 30 minutes for consultations.
Most garden rooms in Marlow fall under permitted development and don't require planning permission — as long as they're single-storey, under 2.5m tall (if within 2m of a boundary), and cover no more than 50% of your garden. We'll advise on this during your free consultation and can handle any planning applications if needed.