Cobblelock Shed Base Dublin - A Premium Look for Your Garden Building (2026)

How We Build a Cobblelock Shed Base

Most cobblelock shed bases take a full day, sometimes a day and a half if the access is awkward. Here’s the rough process.

1. Excavate. We mark the shed footprint plus 100-150mm extra on every side for the edging. Then dig down around 200-250mm depending on the soil. North Dublin clay tends to need the deeper end of that range because the ground holds water and we want a generous hardcore depth to work as a soakaway.

2. Lay the sub-base. 150mm of compacted 804 hardcore, in two passes with the whacker plate. Compaction matters more here than on most other base types. Block paving sits on sand, sand sits on the hardcore – if the hardcore moves, the whole thing moves.

3. Install the edge restraint. Either a perimeter edging block bedded in concrete, or a concrete haunching around the full edge of the area. This locks the blocks in and stops them spreading out over time. Non-negotiable. We’ve never had a base fail in this part of the build, and it’s because we don’t skip this step.

4. Screed the sand bed. 30-40mm of sharp sand, screeded perfectly flat between the edging. This is the bit that gives the blocks their final level. Get it wrong and the whole surface looks wavy.

5. Lay the blocks. Pattern’s up to the customer. Stretcher bond is the most common – blocks laid like brickwork, offset by half. Herringbone gives a more decorative look but takes longer. We work from a corner outward, keeping the lines true with a string line. Cuts at the edges go in last.

6. Compact and joint. Once all blocks are laid, we run a plate compactor with a rubber mat over the whole surface to settle them into the sand. Then kiln-dried jointing sand is brushed across and worked into the gaps between every block. Final compaction. Job done.

A neighbour in Castleknock had us do one of these last summer. Existing cobblelock driveway, customer wanted a small 2.4m x 1.8m (8ft x 6ft) timber summerhouse to match. We dug out the corner of the back garden, laid 200mm of 804, perimeter edging haunched in concrete, sharp sand bed, and laid the blocks in a stretcher bond pattern using leftover stock from the driveway job five years earlier. Total cost was around €520. Looks like the summerhouse was always meant to be there.

Cobblelock vs Other Shed Base Types

Here’s the full picture. For a standard 2.4m x 1.8m (8ft x 6ft) shed in Dublin.

Pricing update, September 2026: our paving slab bases are now €125 – €190 per m², around 25% above an equivalent poured concrete base. Slabs use more materials and every one of them is bedded and levelled by hand. The final price depends on size, ground preparation and access.

So you’re paying a bit of a premium for the aesthetic. About €100-200 more than gravel, similar to concrete on raw cost. Where cobblelock wins is the way it sits in the garden. A concrete pad always looks like a concrete pad. Block paving looks like part of the landscaping.

For the full breakdown across all base types and how access affects pricing, our shed base cost guide has the detail.

What About the Damp?

Steel sheds especially need to be thought through here. Block paving has joints. Joints let air pass through, but they also let water reach the underside of the shed if there’s no membrane.

For any steel shed going on a cobblelock base, we always lay a DPM (Damp Proof Membrane) on top of the blocks before the shed itself goes down. The DPM stops rising moisture and condensation from below. Cut to fit, taped at the edges. Adds maybe €25-30 to the job and saves you from rust problems three winters down the line.

For timber sheds, the same logic applies but it’s less critical. Wood handles minor damp better than steel. We’d still recommend the DPM though – costs nothing in the grand scheme.

For more on how the choice between concrete and other base types interacts with the type of shed you’re putting on top, have a look at our concrete shed base Dublin page.

Drainage and Dublin Weather

Met Eireann reckons Dublin gets around 200 rain days a year. So drainage matters.

Cobblelock handles rain well. The joints between blocks are permeable – water runs down through the kiln-dried sand into the hardcore below, and from there into the ground. No surface puddles, no runoff problems. Compare that to concrete, which sheds water sideways and needs a drainage channel sorted around the edges.

The only real watch-out is the sub-base. If the hardcore’s compacted properly and the ground beneath has somewhere for the water to go, you’re grand. On heavy clay around Blanchardstown or Mulhuddart, we’d dig a bit deeper and lay a thicker hardcore layer underneath to act as a soakaway. Standard practice on those soils, and it keeps the cobblelock sitting flat for years.

Planning permission, updated 9 August 2026. Since 27 July 2026 garden structures of up to 30 m² are generally exempt from planning permission, up from 25 m². At least 25 m² of private open space still has to be left at the back or side of the house.

Full conditions for exempted development

Maintenance – What to Expect

Low maintenance, but not zero.

• Re-sand the joints every couple of years. Kiln-dried sand washes out slowly with heavy rain. A bag costs about €10-15 and a quarter of an hour with a stiff brush sorts it.
• Watch for moss or weeds in the joints. Easy to handle – either pull them, or use a path-friendly weed solution.
• Check the edge restraint annually. If a corner has loosened, get it re-haunched before the blocks start to migrate. Rare on a properly installed base, but worth the look.

That’s the lot. Honestly. Block paving is one of the lowest-maintenance hard surfaces you can put down.