Mezzanines and Platforms in Metal Buildings
You already paid for the height. A building with a 24-foot eave and a single story of work underneath it is wasting a lot of air, and a mezzanine is the cheapest way to turn that air into floor. A mezzanine is a raised platform built inside the building, usually freestanding on its own columns, that adds a second level for offices, parts storage, a break room or a packing deck.
The economics are simple. Adding a second level to an existing shell costs a fraction of what it takes to build new square footage, because the foundation, roof and walls are already paid for. The catch is that a mezzanine is also a regulated structure. It carries people and stored goods, so it has to be designed for load, fire and exit, and it has to be approved by the city before you use it.
We design, supply and erect mezzanines and platforms in new and existing metal buildings across Texas. That includes simple storage decks, office levels with stairs and guardrails, and equipment platforms that serve a production line. The key is deciding what goes on top before a column is set.
The rules a mezzanine has to meet
Texas cities adopt their own commercial code editions on top of a statutory floor that points to the International Building Code. Dallas, to take one, lists the International Building Code and International Fire Code with local amendments. Which edition governs your mezzanine changes the exit, sprinkler and area limits, so we confirm it with the building department before design.
The model codes treat a mezzanine as a partial floor level inside a room, and generally limit its area to a fraction of that room, with conditions on openings and exits. You may also need a second means of egress, extended fire sprinklers or a rated enclosure, depending on use. Accessibility also applies: state accessibility standards require plan review on projects with a total cost of $50,000 or more, and an upper level that the public or employees use may need an accessible route. We flag these items in the first meeting so they do not arrive after the steel is bought.
What we build, and what it carries
The structure is usually a steel framework of columns, beams and joists, designed independent of the building frame so it does not load the walls. Columns land on a thickened slab or on their own footings, which we locate and size from the loads. The deck can be steel deck with concrete topping, bar grating for open-air platforms, or a panel floor for lighter use.
Live load is the number that drives cost. An office level is lighter than a storage deck for boxed parts, and a deck for heavy equipment is heavier still. Telling us what you will put up there, and where, is the most helpful thing you can do. We add stairs, landings, guardrails and gates, and we detail any pallet gate or lift where goods go up and down. If the project is larger, our industrial office buildouts work finishes the space with walls, ceiling, power and HVAC.
Fitting it into the building you have
On an existing building, we start by measuring. We check slab thickness and condition, column locations, sprinkler layout, lighting and the clearances overhead. We often find that the column grid has to be adjusted to miss a utility line or a sprinkler main, and it is cheaper to learn that on paper.
The install itself is quick and mostly quiet. Steel is delivered pre-cut and bolted together on site, so it does not shut down operations for long. We work in sections so forklift traffic can keep moving, and we protect the slab and racking while we work. For owners who also want more footprint, the building expansion and addition crews we coordinate can add floor area outward while we add it upward.
Warehouse bays, small suites and offices
Mezzanines show up in Houston-area logistics space for a reason. In Katy, a 97,000-square-foot warehouse along Highway 99 was reported to be divisible into spaces as small as 9,500 square feet, and a 131,300-square-foot warehouse and office facility was leased in a business park south of Interstate 10. In small and mid-size bays like those, tenants need office and storage areas on top of a working floor. A mezzanine delivers that without paying for a larger building.
That is the typical tenant story: a short-term lease, an owner reluctant to add permanent construction, and a user who needs to move in fast. Mezzanines can be built to be removed, and in many cases moved, which suits leased space. If you are in the Houston market, see our Katy page for what we do there, and our Dallas page for larger metro projects.
Who uses them
Light industrial and flex users are the largest group, and our flex and light industrial page explains how those buildings are laid out. Fleet operators like a second level for dispatch offices and parts rooms above a repair bay, which is why automotive and fleet users call us often.
Distribution and e-commerce operators put pick modules and packing stations on platforms. Manufacturers use them for control rooms and for access to equipment. In each case the design starts with the people and goods on the platform, not the steel catalog.
Add a second level
Tell us the building, the use of the upper level and the loads. We will measure, check code and send a price with a schedule that fits your operation.
Common Questions
Do I need a permit to add a mezzanine?
Yes, almost always. A mezzanine adds usable floor area and changes exit and fire requirements, so the city reviews it. We prepare the drawings and handle the submission. If the project cost reaches the state threshold, accessibility registration is also required.
How much weight can a mezzanine hold?
Whatever it is designed for. Office use takes a modest load, and storage use takes much more. We design to the use you tell us about, and we mark the rated load on the platform so no one overloads it.
Can a mezzanine be added to an existing building without stopping work?
Usually yes. We work in sections, protect equipment and coordinate with your operations. Some steps, like footing work or sprinkler changes, may need short shutdowns of a bay, and we schedule them with you.
Can the mezzanine be moved later?
Often. A bolted steel mezzanine can be taken down and reused, though some portions such as footings or stairs may be left behind. If you rent your space, tell us, and we will design.
Does a mezzanine need sprinklers?
It depends on the use, the area and the local code. Many existing sprinkler systems need to be extended or adjusted. Your fire marshal and sprinkler contractor will make the call, and we coordinate with them early.
