Mezzanines
Warehouse Mezzanines: Double Your Usable Space Without Moving
Double your usable space without moving facilities. Engineered platforms that create a second (or third) level above your existing floor.
2× Floor Space
From the same building footprint
300 PSF
Engineered for your load profile
PE Stamped
Drawings and permit docs included
A warehouse mezzanine is a freestanding elevated platform that creates additional usable floor space within an existing building without expanding the footprint. Mezzanines are engineered for specific load requirements and typically require building permits, structural calculations, and fire code compliance.
The Right Application
When You've Run Out of Floor Space
Office and Support Space Above the Floor
Converting warehouse cube into office, break room, or support space above the operations floor reclaims the footprint for storage, without adding a separate facility.
Pick, Pack, and Value-Added Services
Pick-pack operations, light assembly, and kitting work don't need to compete with forklift traffic at floor level. A mezzanine creates a dedicated elevated work area with gravity conveyor or chute integration to the floor below.
Additional Storage Without Real Estate Costs
If your lease has years remaining and expansion isn't an option, a mezzanine is frequently the lowest cost per square foot of additional usable space, significantly cheaper than relocating or adding building square footage.
Technical Specifications
Key Specs & Configuration
| Load Capacity | 125 PSF (office/light use) to 250+ PSF (heavy storage or equipment) |
| Clear Height Below | Minimum 8' recommended; 14'+ ceilings ideal for storage underneath |
| Span | Custom-engineered, typically 20'–80' |
| Decking Options | Steel bar grating, concrete on metal deck, plywood on steel, or resin panel |
| Access | Stairs, material lifts, conveyor integration, safety gates, designed for your use case |
| Best For | Space-constrained facilities, pick/pack areas, office above warehouse, VAS operations |
| Cost Drivers | Priced by square foot of structure, then adjusted for load rating, height, decking type, and access components; electrical and permitting additional |
| Code Notes | Building permits required: occupancy classification, fire separation, egress, ADA, and structural calcs all reviewed; complex fire code review for occupied elevated spaces |
Brands We Carry
Built With Industry-Leading Components
How It Works
How We Design a Warehouse Mezzanine
A warehouse mezzanine is a steel platform built inside a building to create a second working level above the floor you already have, without touching the roof, the walls, or the lease. It stands on its own columns, carries its load down to the slab, and leaves the space underneath in use. Same footprint, twice the floor.
Three structures cover most of what gets called a mezzanine. A freestanding structural steel mezzanine stands on its own columns, which makes deck height, column grid, and load rating yours to specify rather than something inherited from a catalog. A rack-supported mezzanine builds the walkable level into the pallet rack itself, which is how a pick module is assembled. A shelving-supported mezzanine does the same at a smaller scale over hand-pick areas. Catwalks and equipment platforms are close relatives but not the same thing: they are access and equipment structures rather than added floor area, and building codes treat them under separate rules, which matters before anyone calls a platform a mezzanine on a permit application.
Design starts with what the level is for, because the use sets the load class. Office and light support space is typically designed around 125 PSF, heavy storage and equipment at 250+ PSF, and we engineer platforms up to 300 PSF where the application calls for it. Then the column grid, which is the decision most people underestimate. Columns have to land where they do not block forklift travel or cut across an aisle that already works, so the grid gets drawn against your traffic pattern before it gets drawn against the steel. Clear height below decides whether the space underneath stays useful, and we want a minimum of 8' clear, with 14'+ of building height being where storage underneath really pays. Deck type follows the work: steel bar grating, concrete on metal deck, plywood on steel, and resin panel each behave differently under rolling loads, spills, sprinkler water, and noise.
Access is the piece that gets left until last and rarely should be. Stairs set the egress path, pallet gates make loading the level safe, and a vertical reciprocating conveyor or material lift is what moves product between levels when a stair will not do it. Fire and egress belong in the first drawing too. The number and placement of stairs, travel distance to an exit, guardrail and kick plate details, sprinkler coverage above and below the deck, and how the building department classifies the occupancy on the new level all change the structure itself. Mezzanines carry the most complex permitting of any warehouse install, and our guide to mezzanine permit requirements walks through what the process involves.
Every mezzanine we install is a structural engineering project, not a modular kit assembled from catalog dimensions. Column spacing, deck load ratings, stair and guardrail configurations, and egress compliance are designed around your application and your jurisdiction's building code. We design, engineer, permit, and install, and the finished platform comes with stamped drawings and a permit record documenting the load ratings, which is useful the day an insurance carrier or a future tenant asks for it. To see the shape of one before you call, our 3D mezzanine configurator sets footprint, clear height, live load, and deck type and produces a spec sheet with the dimensions and design loads a permit package starts from.
Build Options
Framing, Decking, and Access, Specified Piece by Piece
A mezzanine is a set of decisions, not a catalog part. These are the components we specify on every platform, chosen around the load, the clear height underneath, and how people and product will move on and off the deck.
Framing
Beam-and-beam, beam and C-section, or bar joist framing. The choice trades column count against depth: longer spans put fewer columns on the floor below but take more clear height out from under the deck.
Decking
Bar grating lets light and sprinkler water through. Resin board or plywood over steel deck gives a smooth surface for carts and foot traffic. Concrete on metal deck carries the heaviest rolling loads.
Stairs
Straight runs where there is room, switchbacks where floor space is tight, sized and placed to set the egress path from the deck rather than added after it.
Guardrail and Kick Plate
Square or round tube rail around every open edge, with wire mesh infill wherever product could be pushed off the deck onto the floor below.
Pallet Gates
Pivot gates keep a barrier between the worker and the open edge the whole time a forklift sets a pallet on the deck. Swing and slide gates suit lighter, less frequent loading.
Material Lifts
A vertical reciprocating conveyor moves pallets and carts between levels when a stair cannot, planned into the structure and the gate layout from the first drawing.
What You Get
Built In, Not Bolted On
Structural Steel Construction
Hot-rolled steel columns and beams, grated or plywood deck, code-compliant guard rails and stair towers. Built to last decades, not years.
Custom Configured
Column spacing, deck height, stair locations, and load ratings designed for your application, not constrained to catalog dimensions.
Full Permit Package
Stamped structural drawings, building department permit, fire marshal sign-off, and final inspection record. Complete documentation from day one.
Best Suited For
Common Applications and Industries
Warehouse Distribution
Pick-pack and value-added services elevated above the warehouse floor.
Commercial Real Estate
Adds usable square footage to a building without construction, and it shows in the listing.
Third-Party Logistics
Office and VAS space that doesn't consume warehouse floor area.
Manufacturing
Parts storage, QC inspection areas, and packing stations above the production floor.
Related Services
We Handle Design, Installation & Permitting
Hammerhead provided a turnkey rack solution that I needed in my warehouse. From design and permitting to installation. Very professional and will use them again in the future!
Kaitlyn Biver
Google Review
Other Systems to Consider
Related Storage Systems
Vertical Reciprocating Conveyors
Material lifts that move pallets and carts between the floor and the deck, planned into the platform from the first drawing.
Learn More →
Pick Modules
Multi-level integrated pick systems that combine mezzanine structure with flow and conveyor components.
Learn More →
Guardrails & Barriers
Floor-level barriers protecting mezzanine columns and stair landings from forklift traffic below the platform.
Learn More →FAQ
Common Questions
What is a warehouse mezzanine?
A warehouse mezzanine is a freestanding elevated platform built inside an existing building to add a second working level without expanding the footprint. It carries its own load on its own columns down to the slab, so the floor underneath stays usable for storage, staging, or forklift travel. Mezzanines are engineered to a specific load rating and almost always require a building permit. For how building codes draw the line between a mezzanine and a story, see what a mezzanine floor is.
What are the types of warehouse mezzanines?
Three structures cover most projects. Freestanding structural steel stands on its own columns and is the most flexible, because deck height, column grid, and load rating are all specified to your building. Rack-supported builds the walkable level into the pallet rack, which is how a pick module works. Shelving-supported does the same at a smaller scale over hand-pick areas. Catwalks and equipment platforms are related structures that building codes treat differently.
How much weight can a warehouse mezzanine hold?
It is specified, not fixed. Capacity is stated as a uniform live load in pounds per square foot, and the rating comes from what the level will be used for. Office and light support space is typically designed around 125 PSF, heavy storage and equipment at 250+ PSF, and we engineer platforms up to 300 PSF. Concentrated loads from equipment are reviewed separately from the uniform rating.
Does a warehouse mezzanine need a building permit?
Almost always, yes. Building departments treat a mezzanine as new floor area inside the building, which brings structural calculations, occupancy and egress review, fire protection, and ADA into the permit. That is separate from any high-pile storage permit the facility already holds. Our mezzanine permit requirements guide covers what plan review asks for, and we handle permitting as part of the project.
What does a mezzanine cost?
Mezzanines are priced by the square foot of steel structure, with access components (stairs, material lifts, safety gates) and decking type (grating, plywood, concrete) added on top. What moves the total most is size, height, load rating, and how complex permitting is in your jurisdiction, which varies more than people expect. We quote after reviewing your building conditions, because a per-square-foot estimate without them is not meaningful enough to plan against.
How long does mezzanine design, permitting, and installation take?
Design and permitting typically takes 6–14 weeks, more in jurisdictions with complex review processes. Installation takes 1–3 weeks depending on platform size. We manage the full timeline and set realistic expectations at the start of the project, not after permits are submitted.
Can a mezzanine be relocated if we move facilities?
Yes, structural steel mezzanines can be disassembled and reinstalled in a new facility, provided the new space can accommodate the structure. Re-permitting is required in the new jurisdiction. We design with future disassembly in mind when clients anticipate a potential facility change.
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