Ground Screws vs Concrete: Which Shed Base is Right for Edinburgh Gardens?

Choose ground screws if you have a sloping garden, tree roots, soft or boggy ground, want a same-day install with no mess, or expect to relocate the shed later. Choose a concrete pad if you have flat ground, want the lowest long-term cost, are fitting a heavy workshop or insulated garden room, and don't mind a 48–72 hour curing wait.

Ground screws are heavy-duty galvanised steel screws — typically 600–1,200mm long — driven deep into the ground with a hydraulic driver. The shed bearers bolt directly onto the screw heads, lifting the floor cleanly above ground level. For a typical Edinburgh garden shed we use 6 screws (8×6) or up to 12 screws (12×10 garden room). Our day-rate for ground screws is £1,800 + VAT, which works out at roughly £300 per screw installed — and the whole base goes in inside a single day.

A concrete pad is a poured slab — usually 75–100mm thick for sheds, 100mm reinforced for garden rooms — laid over a compacted MOT Type 1 sub-base. It creates a perfectly level, immovable foundation that lasts decades. In Edinburgh, our concrete pads run from around £1,200 + VAT for a small 8×6 pad up to £3,200 + VAT for a 12×10 reinforced garden-room base. Pour day takes around 6 hours and the slab needs 48–72 hours to cure before the shed can sit on it.

Ground screws (6 screws / 8×6 shed): around £1,800 + VAT. Concrete pad (8×6 shed): around £1,200 + VAT. Ground screws (10–12 screws / garden room): £2,400–£3,600 + VAT. Reinforced concrete pad (10×8–12×10 garden room): £2,500–£3,200 + VAT. For smaller standard sheds, concrete is cheaper. For garden rooms and larger workshops, the two pricing methods land within the same window — and the choice usually comes down to ground conditions and timescale rather than cost alone.

Ground screws win comfortably here. We arrive in the morning, drive the screws in a few hours, and the shed can go on the same day — no concrete mixer, no spoil heap, no curing wait. A clean job, ideal if your garden is the only access to the rear of the property. A concrete pad requires excavation, sub-base prep, formwork, the pour itself, then 2–3 days of curing before installation. Total elapsed time is normally 4–5 days.

Ground screws shine in conditions concrete struggles with: • Sloping Edinburgh gardens — common in Morningside, Fairmilehead, Liberton, Juniper Green and Penicuik. Each screw is set independently to a precise height, so we level a slope without retaining walls or stepped pours. • Soft, boggy or clay ground — the screws transfer load to firmer soil deeper down. • Tree-rich gardens — we work around root systems without trenching, which is ideal for The Grange, Blackford, Comiston and Trinity villas. • New-build estates with shallow topsoil over hardcore — screws bite straight through. • Listed properties or conservation areas where you want the option to remove the shed without leaving a permanent slab behind.

Concrete remains the gold standard for: • Heavy workshops with cast-iron tools, vehicle storage, or anything over 1 tonne load. • Insulated garden rooms used as offices, gyms or studios — the thermal mass and dead-flat surface help with door alignment, flooring and long-term stability. • Flat gardens with good drainage where the cost advantage of concrete shines. • Customers who want a permanent, set-and-forget foundation that will outlast multiple sheds.

Drainage matters in Edinburgh. Heavy rain on clay soils — particularly in West Lothian, Midlothian and the Pentland-foot suburbs — can pool water against a poured slab unless you've designed in a fall and a French drain. Ground screws sidestep this problem entirely by lifting the shed clear of the ground. Wind also matters. Coastal sites in Joppa, Portobello, Newhaven and South Queensferry need solid anchoring. Both options work — but ground screws are mechanically anchored deep into the ground, which gives excellent uplift resistance for exposed sites.

For a standard 6×4 to 8×6 garden shed on flat ground, a concrete pad is usually the most cost-effective long-term choice. For anything on a slope, near trees, on soft ground, or where you want a same-day install with zero mess, ground screws are worth the extra spend. For garden rooms, the two systems are comparably priced — we'll recommend ground screws if access is tight or the garden is sloped, and reinforced concrete if you have flat ground and want maximum thermal mass under your floor.