Concrete shed and garage bases in London & Kent, poured in a day.
We dig out, compact, reinforce and pour a level concrete base for your shed or garage, then take the muck away. Our own mini diggers fit through a gate of around 80cm.
Free quote. No deposit. Mon–Sat, 7:30am–5pm.
What a proper shed base is made of
A shed is only as good as the ground under it. Timber bearers on a few paving slabs will move, rot and let the door drop out of square. A reinforced concrete slab stays flat, keeps the floor off damp soil and gives you a base that will outlast the shed standing on it.
For sheds and garages we pour 100 to 150mm of concrete with A142 steel mesh sitting on a compacted MOT Type 1 sub-base. We set the exact thickness by the size and weight of what is going on top. A small garden shed is at the lighter end; a garage, workshop or a shed full of machinery is at the heavier end.
- Dig out the topsoil and soft ground to the depth needed
- Compact an MOT Type 1 sub-base in layers
- Fix timber shuttering to set the edges and the level
- Lay A142 mesh on spacers so it sits in the slab, not under it
- Pour, level and finish the concrete surface
How the job goes, start to finish
You send a photo of the spot and the access, plus a rough width and length in metres. We give you a guide price on WhatsApp, usually within 30 minutes, then confirm a fixed price once we have seen the site.
On the day we mark out, excavate, compact the sub-base, set the formwork and pour. Most standard shed bases are dug, prepared and poured in one day. Spoil goes into the dumper and off site, and the shuttering comes off once the concrete has set enough to hold its edges.
Getting the machines in
A lot of London and Kent back gardens can only be reached down a side passage. Our smallest digger and tracked dumpers need around 80cm of clear width, so a normal gate is usually enough. We run machines from 0.8T up to 5T and send the size that fits your access.
If the passage is narrower than that, tell us the measurement. We can often still do it with smaller kit or by barrowing the material through by hand, though that takes longer and we will say so before you agree anything.
Sizing and siting your base
Make the slab the same size as the shed floor, or a touch smaller, so rain running off the cladding drops onto the ground rather than pooling on the concrete around the walls. Most shed makers give a recommended base size, so send us the model or the floor dimensions and we will pour to suit.
Think about where water goes. A slab with a very slight fall away from the shed and any neighbouring wall keeps the floor dry. If the garden slopes, say so when you send photos, because we may need to cut into the high side or build up the low side first.
After the pour
The concrete is firm enough to walk on after 24 to 48 hours. We recommend waiting about 7 days before putting a heavy shed or garage on it. Keep it free of heavy loads and, in hot or frosty weather, ask us how to protect it while it cures.
If you want the shed assembled too, we do that once the slab is ready, so there is one team and one point of contact for the whole job.
Where we work
We build concrete bases across all of London and Greater London and throughout Kent, from Croydon, Bromley and Bexley out to Dartford, Sevenoaks, Maidstone, Tunbridge Wells and Canterbury. Send your postcode and we will confirm. Builders and landscapers also use us for the groundworks stage.
Related services
Questions
How big should a shed base be?
Usually the same size as the shed floor, or a touch smaller, so rainwater runs off the cladding instead of pooling on the slab around the walls. Most shed makers give a recommended base size. Tell us the model or the shed dimensions and we will size the slab to suit.
Can you put a concrete base on a slope?
Yes. We either cut into the high side, build up the low side with compacted sub-base, or a mix of both, then pour a level slab. Send a photo showing the slope and we will say which approach suits your garden.
Do I need planning permission for a shed?
Most garden sheds fall under permitted development, but not always. Check with your council if you are in a conservation area, the property is listed, or the shed will be tall or close to a boundary. The base itself is rarely the issue.
Concrete base or timber base: which is better?
Concrete lasts longer, stays level and suits heavy sheds, garages and workshops. A timber frame on compacted ground is lighter and cheaper for a small, light shed, but it can move and rot over time. We can advise from your photos.