Mezzanine Feasibility Screener
Before you pay for drawings, find out whether a deck actually fits. Enter the area you want to cover, your real clear height and what would go on top, and get the height check, the design live load your use implies, the egress and area rules that apply, and the fire-protection scope a deck creates — with the code sections cited so you can check them yourself.
Most mezzanine projects die on something nobody checked in the first week
The idea always starts the same way. There is twenty-six feet of clear height over an area doing one job, and somebody says the obvious thing: why are we not using the top half of this building? It is a good instinct, and it is often right. What follows is usually not.
What follows is a drawing, and then a series of discoveries. The deck is more than a third of the room, so the plan reviewer treats it as a second story. The occupant load needs a second stair, and the second stair lands in an aisle that cannot move. The ceiling sprinklers no longer protect what is underneath the deck, so the fire protection system needs re-designing. The clear height everyone quoted was to the roof, not to the duct running through the middle of the bay. Each of those is knowable on day one, and each of them is normally found on day ninety.
This screener asks for the handful of numbers that decide those questions and gives you the answers before you commit to anything: whether the height genuinely works, what live load your intended use implies, how many means of egress your occupant load indicates, whether the one-third area rule bites, and what a deck does to your fire protection. It cites the code sections it uses. It produces no pricing, makes no structural determination, and tells you plainly when the answer is that a deck is the wrong move.
Who this is for
- Plant and facility managers looking at a second level instead of a building expansion
- Operations leaders comparing a mezzanine against a lease or a move
- Facility engineers scoping a project before bringing in a structural engineer
- Distribution and manufacturing sites with real height and no floor
What you need to hand
- The area you want to deck over, in square feet
- The total floor area of the room it would sit in — this screens the one-third rule
- Clear height to the lowest obstruction, not the roof peak
- What goes on top: storage, offices, light manufacturing, a pick module or an equipment platform
- What stays underneath, and whether people work there
- How people and material would get up: stairs, a lift, or a forklift-loaded pallet gate
- Whether the building is sprinklered, and whether you own or lease it
Don’t have all of it? Every field that can be left blank, can be — the tool tells you which missing number would change the answer most.
Screen your mezzanine
The full feasibility read — the height check, the load, the egress and area findings and every open question — appears on this page immediately. We only ask for your details if you want a PDF copy, an engineering review, or to talk to a project specialist.
Prefer a full window? Open the mezzanine feasibility screener in a new tab.
How it works
Measure the real clear height
To the lowest obstruction over the area: sprinkler heads, joists, lights, ducts, a crane rail. This single number decides whether the project exists, and it is the one most often overstated by four or five feet.
Give the deck area and the room area
The deck footprint you want, and the total floor area of the room it sits in. The ratio between them is what a plan reviewer looks at first.
Say what goes above and below
The use above sets the design live load and the occupant load factor. Whether people work underneath turns headroom, lighting and under-deck sprinklers from preferences into requirements.
Read the checklist, not just the verdict
You get a flagged checklist — clear items, items to check, and blockers — each citing the threshold it used. It is the list of questions to bring to an engineer, and it is deliberately not a code determination.
How to read your screen
The height check is the first thing to read, because nothing else matters if it fails. A conventional occupied deck needs seven feet of clear height below and seven feet above the walking surface, plus the depth of the framing itself — so roughly fifteen and a half feet of clear height is the practical floor. Below that, the honest answer is usually density rather than a deck.
The design live load comes from what you put up there: light storage, heavy storage, offices, light manufacturing. The screen shows the value commonly specified for that use and multiplies it across your deck area so you can see the total load heading into columns, baseplates and your slab. The engineer of record sets the governing load — this is the order of magnitude, not the design.
Egress is screened from your area and the occupant load factor for the use. Past a small occupant load a second means of egress is normally required, and two stairs at opposite ends is a very different layout from one stair in a corner. Finding that out before the layout is fixed saves the most time of anything on this page.
The one-third area rule is the item that most often forces a redesign. A mezzanine is generally limited to one third of the floor area of the room it sits in; above that, the structure is often reviewed as a full second story, with different egress, fire-rating and permitting consequences. If your screen flags this, settle it with your AHJ before anything else.
Fire protection is the most common surprise cost. A solid deck creates a concealed space, and ceiling sprinklers generally do not protect what is under it — so heads and lighting beneath the deck become scope. In an unsprinklered building, adding a deck can change the allowable area calculation for the whole building.
What this tool does not do
This is a feasibility screen built from the numbers you enter. It is not a structural design, a code determination, a permit submittal or a quote.
- Nothing here replaces a licensed structural engineer or your local authority having jurisdiction, and every threshold cited has exceptions.
- Code references are given so you can check them yourself. Adopted editions, local amendments and AHJ interpretation all vary by jurisdiction.
- Live load values shown are those commonly specified for the stated use. The engineer of record sets the governing design load, including concentrated, equipment, impact and seismic effects.
- Slab capacity, footings, seismic category, lateral bracing and existing egress arrangements are not screened here and can all change the answer.
- No pricing is produced. Configuration, span, load, finish, freight and installation decide cost, and a person confirms every number on a quote.
Products and related tools
Mezzanines and work platforms
Free-standing, rack-supported and shelving-supported deck systems.
Industrial stairs and work platforms
Stairs, landings and guarded edges for a raised level.
Modular offices
Office space under or on a deck, built as a system rather than site construction.
Industrial shelving
Shelving-supported levels where the storage carries the deck.
Manufacturing Floor Space Recovery Calculator
The density answer to compare against a deck, when a deck does not fit.
Warehouse Opportunity Scanner
A broader read on what your building is not using.
Common questions
How much clear height do I actually need for a mezzanine?
Why does the size of the room matter?
Do I need two staircases?
Will a mezzanine affect my sprinkler system?
Can I put a mezzanine in a leased building?
Does this tell me what a mezzanine costs?
Request an engineering review of your mezzanine
Send this screen in with a layout or a few photos. We measure the real clear height and obstructions, look at the slab and the sprinkler design, and come back with what will actually pass — including telling you when a deck is the wrong answer and density is the right one.