The 4m x 4m Mercia Rufford Insulated Garden Room is designed for all-year use, so its ideal for a garden office or guest space. It is made with 100mm thick double-skinned walls containing Eco-quilt multi-foil insulation for comfort in all seasons. The key features include:. *Free Home Installation *14 mm double-glazed windows with 2top opener and 2 fixed windows *Ultra-modern wing design *EcoQuilt insulated walls and roof *Air Tec Insulated floor *Customisable design *16mm Tongue and groove floor *Interlocking Tongue and Groove Roof *10-year anti-rot guarantee