Concrete slab, pad-and-beam or screw pile, specified to the ground you have, not to a one-size-fits-all kit.
A garden room is only as good as what's holding it up. We survey the ground, check for services and tree roots, and pick the foundation that matches the site, a concrete raft where it makes sense, pad-and-beam where you want to minimise disturbance, or screw piles where access is tight.
The foundation is the bit you can't revisit. Everything above it can be replaced, upgraded, re-skinned; the foundation you pour or drive on day one is there for the life of the building. Which is why we survey the ground before we quote, not after, and match the foundation type to what we find.
For most South-East gardens on firm clay or gravel with no drainage issues, a reinforced concrete raft is the right answer: a 150mm slab on compacted sub-base with A252 mesh, ring beam edge thickening, and a continuous damp-proof membrane under the slab. It's the most forgiving foundation type and gives the warmest, flattest floor zone.
Where access is tight, existing tree roots can't be disturbed, or the ground is made-up fill with unknown bearing, we switch to screw piles: steel helical piles driven into the ground by a small hand-operated rig, with a steel frame bolted to the pile heads supporting the timber floor structure. Minimal excavation, minimal waste, minimal disturbance to existing roots, and a very stable platform on the right ground.
Foundation picked to match the ground, not because it's what we always use.
Root protection zones and existing drainage respected.
Laser-levelled set-out so your finished floor isn't a subtle slope.
Cladding, internal finishes, flooring, lighting, HVAC, one crew through to handover.
Insulated, fully wired, broadband-ready, with a dedicated circuit from the main consumer unit and optional climate control.
Reinforced flooring, ventilation, soundproofing and mirror walls, sized to fit your kit, not the other way around.
Tell us about your project, we'll come back the same working day.
