Groundworks vs Oversite: What’s the Real Difference?

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Jul 4
2 min read

Updated: Jul 7

ShellCo explains the structure behind your structure

When planning a build, most people get confused between groundworks and oversite — but they’re actually two distinct, crucial stages. At ShellCo, we specialise in both, and we’re here to break it down so you know what’s happening beneath your feet.

Groundworks are the very first phase of construction — everything that happens before the actual structure begins.

They include:

Site clearance
Trenching
Foundations and footings
Drainage installation
Utilities groundwork
Earthworks (levelling, compaction)

Groundworks are all about preparing the land so the building above stays solid, dry, and long-lasting.

What Is Oversite?

Oversite is what comes after the foundations are in.

It’s the layer that forms the base of your ground floor, bridging the gap between the ground and the building’s internal surface. Most commonly, this is where we install a block and beam floor, damp-proof membrane, insulation, and a concrete topping.

Oversite makes the structure:

Stable
Level
Insulated
Protected from moisture and gas ingress

Why It Matters to Get Both Right

If groundworks are off — your foundations will fail.If oversite is poor — your floors will crack, your insulation will be pointless, and you’ll fight damp forever.

That’s why ShellCo handles both with absolute precision — giving you a build that’s stable from the ground up.