What Is a Build-Out in Construction?

What the work actually includes

A landlord typically delivers commercial space in an unfinished condition. The build-out is everything that happens between that hand-off and opening day: interior framing and partitions, ceilings, mechanical and ductwork, electrical distribution and lighting, plumbing, fire protection, flooring, millwork, paint, and the finishes and fixtures specific to the business.

The scope depends heavily on the condition the space is delivered in and on what the business needs. A law office and a restaurant occupying identical square footage will have very different build-outs, because the restaurant adds grease interceptors, hood systems, additional gas and plumbing capacity, and health department requirements the office never touches.

Full build-out vs. partial build-out

A full build-out means the space is finished completely from an unfinished starting point, with every system and surface installed as part of the project. This is what a listing means when it describes a space as requiring full build-out, or a lease term as delivering in "full build-out condition."

A partial build-out means some of that work already exists. The space may already have restrooms, a finished ceiling, or distributed HVAC, and the project only adds what the incoming tenant needs on top of it. Partial build-outs are usually faster and less expensive, but they can carry constraints, because the existing layout and systems limit what the new floor plan can do.

Shell conditions you will see in a lease

Cold dark shell describes a bare space with no interior finishes and no distributed mechanical, electrical, or plumbing beyond a point of connection. Everything is part of the build-out.

Vanilla shell, sometimes called white box, describes a space delivered with basic finished conditions already in place — finished walls, a ceiling, basic lighting, HVAC distribution, and often a restroom. The tenant’s build-out then handles the business-specific work.

These terms are not standardized across markets, and two landlords can use the same phrase to mean different scopes. The lease language and the delivery condition exhibit govern, not the label, which is why the shell condition is worth confirming in writing before pricing a build-out.

Is a build-out the same as a tenant improvement?

In practice the terms are used interchangeably. Tenant improvement, often shortened to TI, is the term more common in leasing and finance, particularly around a tenant improvement allowance, which is the money a landlord contributes toward the work. Build-out is the term more common on the construction side. Both describe the same physical work.