Core and Shell

In architecture and construction, core and shell refers to the parts of a building that get built before the interior is fitted out.

The core typically includes elevators, stairwells, and essential building services. The shell includes the structure, exterior walls, windows, and roof.

Once both are done, the rain can’t get in. But there isn’t necessarily anything in the building worth visiting yet — such as exhibitions, if the building is a museum.

It’s like an egg. One team builds the shell. Another handles what’s inside. (I guess it’s not exactly like an egg. But I do like eggs.)

One architect and contractor deliver the museum building, while separate teams fit out the restaurant, gift shop, and exhibitions.

As you might expect, having different teams handle the core and shell versus the interiors raises some issues.

Suppose an exhibition needs an electrical outlet in a particular location. Does the building contractor provide it? Or the exhibition fabricator?

Things like that are important to decide and track. Why?

> If both assume the other is responsible … nothing gets installed.

> If both include it … the museum might pay twice.

Here’s the thing:

The term core and shell exists to set up a typical division of construction responsibility. And that creates a boundary that needs coordination.

Whoever is responsible for core and shell — and whoever is responsible for everything else — the trick is to make sure nothing gets omitted, nothing gets duplicated, and everyone knows exactly where their work ends.

Warmly,
Jonathan

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MtM Word of the Day:
Core and shell. A construction term describing a building’s basic structure and exterior. It includes the building engineering systems — but excludes interior work. In museums, teams separate from the main building contractor often design and build the exhibitions. This requires careful coordination of responsibilities, budgets, and construction schedules.