Fit out is the term used to describe the process of making an interior space suitable for occupation. In other words, it’s the electrical, mechanical, decorating and furnishing that’s undertaken by the tenant that’s leasing the space from the developer or landlord.

It typically refers to activities making a commercial tenant interior space suitable for occupation. Often fit-out construction is performed by a tenant’s own contractor, as opposed to the landlord’s construction company. A contractor working for a commercial space landlord will typically develop an interior space as a “white box” or “shell.”