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Timber floor of a garden shed just fitted on the metal frame, raised above the lawn on T-Block ground screws.

Ground screws for garden sheds

A base for a timber garden shed, storage shed or log store without concrete: a few T-Block® screw foundations are driven in on a grid under the floor, and the frame is fixed on top. No digging, no pouring.

6–9
T-Block T4/T5 for a shed up to 3×4 m
By hand
up to the T6 series, no machinery
Removable
unscrewed, they leave no trace

Looking for foundations for a timber house to live in? That is a different job, sized on the project: go to Construction.

A shed base, from start to finish

Up to the T6 series the work is done by hand, with a socket and T-handle. Two or three people are enough for a garden shed.

  1. Close-up of the flange head of a T-Block ground screw driven into the lawn, with the frame rail bolted on top.

    Drive in the T-Blocks

    With a tape and string line, mark the grid points under the floor, then drive in each T-Block keeping it plumb. If the ground is hard, drill a small pilot hole first.

  2. Three parallel metal rails fixed on T-Block ground screws in a garden: the shed frame before the floor goes on.

    Level the frame

    The frame rails are fixed onto the heads. Check height and level with a spirit level and adjust the supports.

  3. Corner of the timber shed floor, raised above the lawn on the metal frame, with a T-Block ground screw visible underneath.

    Lay the floor

    The shed floor stays raised off the ground: the timber does not touch the soil and air circulates underneath.

  4. A timber wall of the shed being raised onto the frame that rests on T-Block ground screws; only the legs of the installers are visible.

    Build the shed

    The walls go up straight away, with no waiting for concrete to cure.

The steps of a real installation, July 2021: the base of a timber garden shed in a private garden. The full guide: installing by hand with the T-wrench.

Which T-Block, and how many

These are the rules of thumb our configurator uses. They give a first estimate; the right number depends on the size of the shed and on the soil.

Sheds up to 16 m²

Timber garden sheds, storage sheds and log stores of 3×3 or 3×4 m. One support every 2 m at most, on a grid under the floor, and never fewer than four.

Tip: 6 to 9 T-Block T4/T5

Larger sheds

Above 16 m² the grid opens up to 2.5 m and you move up a series. Up to T6 installation is still done by hand; the T7 requires a power driver and reaction bar.

Tip: T-Block T5/T6, one point every 2.5 m

Soft ground

In soft clay, silt or peat, take the model from the next series up. The configurator does this for you when you choose the soil type.

Tip: one series up
Indicative estimate: one of our engineers will confirm it.Ask for a quote
Work out your shed in the configurator

Garden shed or timber house?

A house to live in is not a garden shed: the foundation is sized on the project, with a check to the Italian NTC 2018 standards, together with the project engineer. Timber, modular and prefabricated houses are on the Construction page.

Why screws for your shed

No concrete slab

No digging, no formwork and no pour. You can build on the T-Blocks as soon as they are in.

A shed raised off the ground

An open gap remains between the floor and the ground: the timber does not touch the soil and air circulates under the base.

On sloping ground too

Each T-Block is driven to the depth needed to take up the difference in level, without levelling the ground or building retaining walls.

Unscrewed, they leave no trace

If the shed moves, the T-Blocks are unscrewed and can be reused. The ground goes back to how it was, with no block of concrete to break out.

Frequently asked questions

How do you make a base for a timber garden shed without concrete?
A few T-Block screw foundations are driven into the ground on a grid under the shed floor, and the base frame is fixed onto their heads. There is no digging and no concrete pour. The frame is levelled by adjusting the height of the supports, and the shed can be built straight away.
How many ground screws do I need for a 3×4 m shed?
For sheds up to 16 m² you place one support every 2 m at most, and never fewer than four: a 3×3 to 3×4 m shed usually needs 6 to 9 T-Block from the T4 or T5 series. Above 16 m² the grid goes up to 2.5 m with the T5 and T6 series. This is an estimate: the configurator works it out for your dimensions and your soil.
Can I install the shed foundations myself?
Yes. Up to the T6 series, T-Blocks are screwed in by hand with a socket and T-handle, with no machinery. Two or three people are enough for a garden shed, and each screw takes 5 to 15 minutes. The T7 requires a high-torque driver.
Do they work if the garden slopes?
Yes. Each T-Block is driven to the depth needed to take up the difference in level, without levelling the ground or building retaining walls.
Do I need a permit for a shed on screw foundations?
That depends on the shed, not on the foundation. A screw foundation is a removable work and for light structures the procedure is often simpler, but how the works are classified depends on the project and on local regulations: always check with your local authority or your designer.

In the garden there are also decks, pergolas, carports and fences, and gazebo anchoring. More answers in the FAQ.

Got a shed to put in the garden?

Tell us the size and what soil you have: we will tell you which T-Blocks to use and how many.

Use the configurator Ask for a quote