Airedale Garden Rooms / Guides
Guide
Garden room bases: which one, and why it matters
A garden room is only as good as what it sits on. On the sloping, wet or tree-lined plots common across the valleys, the base is often the biggest decision.
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Concrete slab
A concrete slab is the traditional base: solid, flat and long-lasting. It suits level gardens and heavier buildings.
On a slope it means digging out the high side or building up the low side, which can turn into a big groundworks job. It also needs access for concrete, which can be awkward in back gardens with no side entrance, such as many terraces.
Ground screws
Ground screws are large steel screws wound into the ground, with the building's frame fixed on top. They need very little digging, can be adjusted to level the building on a slope, and do less damage to tree roots than a dug slab.
They're quick to install and leave no concrete behind if the building is ever removed. The installer will check the ground first, because very rocky ground can be hard to screw into.
Timber frame on pads or adjustable supports
A treated timber frame sitting on concrete pads or adjustable pedestals is another way to get a level floor without a full slab. It works well on gentle slopes and keeps air moving under the building, which helps keep it dry.
Slopes and height limits
Whatever the base, height is measured from the ground. On a sloping plot, raising the low side to get the building level adds to its height there, and within 2 metres of a boundary the whole building must stay under 2.5 metres. A raised platform or veranda over 30 cm isn't permitted development either.
This catches people out on the hillside gardens around Keighley, Baildon and Otley, so ask the builder to check the heights against your plot.
Drainage and damp
On low, wet ground, such as near the Aire or the Wharfe, the base needs to keep the building clear of standing water and let rain drain away. A damp-proof membrane or an air gap under the floor stops moisture rising into the room.
This guide is general information, not legal advice. Rules can change; check with your council before you build. Updated October 2026.
Questions
Quick answers
Which base is cheapest?
It depends on the ground. On level, easy-access ground a slab can be straightforward. On a slope, ground screws or a timber frame often save a lot of digging. The builder will recommend one after seeing the plot.
Can a garden room go near a tree?
Often, with care. Ground screws or pads disturb roots far less than a dug slab. Trees in conservation areas or with a Tree Preservation Order are protected, so check before any work near them.
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