Here is a brief outline of the process that I would go through to construct a garden room or studio. Bear in mind a timber garden structure can mean many things; office, spare room, summer house, workshop, shed, sauna, studio etc. the possibilities are wide.
Here is an approximate guide to prices for timber buildings;
Sheds £250 to £400 per m2
Garages and workshops £350 to £600 per m2
Garden rooms and studios £750 to £2000 per m2
Typically I would use Douglas Fir for the frame, Larch cladding and wool insulation. I mostly do concrete piers or block foundations, this keeps use of concrete to a minimum, and makes for a versatile and affordable base. Internal finish can be anything from plywood lining to skimmed plasterboard.
Here’s an idea of the costs for some items;
Foundations on a level and clear site could cost £750 to £1,000.
Electrical installation; getting power to the building, sockets and lighting could cost from £1000 to £1,750.
Plumbing and drainage; getting water to and drainage from the building, fitting a toilet, basin and kitchen sink could cost between £2,000 to £3,000
Different cladding profiles can be specified and all are available in Larch, Chestnut, Cedar and Oak. Other options as mentioned could include kitchens and bathrooms, or you may want to consider a Green Roof as this adds insulation, can reduce water run off and increases biodiversity.
Overall price can vary widely with timber specified, quality of windows and doors, and customer input, see My Approach to get an idea of how you could also save costs and to understand the range of ways I work.
Contact me then we can discuss your project, costs and the best way to make it happen.