What an industrial bay actually is

The word bay does two jobs in industrial real estate, and almost every misunderstanding between a tenant and a landlord starts with the two meanings being swapped.

A structural bay is a module of the building's frame — the distance from one column line to the next. It is a construction fact, fixed when the building was designed, and it is the same whether the space is leased to one occupant or ten.

A demised bay is a unit of occupancy — the space behind one door, with its own address or unit number, its own utilities and its own lease. It is a legal and commercial fact, and it can be changed by moving a demising wall.

Why the difference matters

When a listing says a building is built on 30-foot bays, that is the structure. It tells you where the columns are, how wide a rack aisle can be, and roughly how the roof loads come down. It does not tell you what you can rent.

When a listing says a 3,000 square foot bay is available, that is the tenancy. It might occupy one structural bay, or two, or two and a half — the demising wall does not have to land on a column line, though it usually does because building it there is cheaper and the fire separation is simpler.

A tenant who asks for "a two-bay unit" without saying which meaning they intend can be shown anything from 1,800 to 8,000 square feet. Ask for square feet and a door count instead.

The parts of a demised bay

• Warehouse floor — the open working area, usually a concrete slab on grade with a clear span to the underside of the structure above.
• Loading — one or more overhead doors, at grade or at dock height. A bay with no overhead door is not really an industrial bay, whatever the lease calls it.
• Office — a built-out area at the front, typically with a separate entrance, glazing to the street and its own heating and cooling.
• Mezzanine — a raised floor over part of the space, often over the office. Whether it counts as rentable area is a negotiation, not a rule.
• Services — the electrical panel, gas meter, water and sewer connection, and the unit heater or make-up air unit that serves that bay alone.
• Yard and parking — the apron in front of the door, the stalls assigned to the unit, and any fenced compound.

Bay, unit, suite and condo

These words are used loosely, and in a lease they mean whatever the lease defines them to mean. As a rough guide to how the market uses them:

What these datasets do not establish

The Calgary and Edmonton datasets used on this site describe assessment accounts, parcels, permits and licence citations. They do not establish a bay's area, clear height, loading doors or current availability. Confirm those details with a named source and a site inspection.

That is why the evidence side of this site publishes buildings, and the bay facts on this site come either from this reference layer, which teaches how bays are generally built, or from the featured layer, where a named party has supplied and authorised the details.