Steel building kits provide a flexible and cost-effective way to construct a wide range of structures, including garages, workshops, commercial warehouses, and agricultural barns. But if you’re considering buying one, there’s one question you’ll want answered upfront:
“What exactly comes in the kit – and what will I need to get separately?”
In this guide, we’ll break down the standard components of a steel building kit, clarify common misconceptions, and help you prepare for a smooth and successful installation.
What Is a Steel Building Kit?
A steel building kit is a pre-engineered package of components manufactured off-site, delivered to your property, and assembled like a puzzle. These kits are designed for durability, fast construction, and cost savings compared to traditional building methods.
But not all kits are created equal – some are basic shells, while others include added insulation, ventilation, or aesthetic upgrades.
Understanding what’s included by default and what’s optional or excluded is key to avoiding surprises.
What’s Included in a Kit
At US Patriot Steel, every kit is engineered for quality, safety, and ease of installation. While specific inclusions can vary depending on your building’s size and purpose, here’s what a standard steel building kit typically includes:
Engineered Building Plans
These are essential, certified drawings that comply with local building codes and load requirements (wind, snow, seismic, etc.). A licensed engineer often stamps plans and may be required to obtain permits.
Includes:
- Foundation plans (if selected)
- Framing layout
- Anchor bolt plan
- Erection drawings
- Connection details
Primary Framing System
The core structural system includes the main frames that support the roof and walls.
Includes:
- I-beams or rigid frames (columns & rafters)
- Base plates
- Connection bolts & hardware
- Frame bracing
These frames are typically hot-rolled or cold-formed steel, pre-punched and pre-welded for on-site assembly.
Secondary Framing System
Secondary framing provides support for walls and roofing panels, adding structural stability.
Includes:
- Girts (wall supports)
- Purlins (roof supports)
- Eave struts
- Bridging, flange bracing
Roofing Panels
Durable metal roof panels are included in every kit, cut to size and matched to the building dimensions.
Includes:
- 26-gauge or 24-gauge steel panels
- Fasteners & closures
- Ridge caps and trim
- Self-drilling screws with sealing washers
You’ll also typically choose the roof pitch, panel style (such as R-panel, standing seam, etc.), and coating (e.g., Galvalume, color, etc.).
Wall Panels
Similar to roofing panels, the wall cladding is made of steel panels in your preferred finish and color.
Includes:
- Horizontal or vertical panels
- Wall trim
- Base trim
- Corner trim
Fastening System & Bolts
All structural bolts, nuts, and fasteners needed to assemble the building frame and attach panels are included in the kit.
Includes:
- Anchor bolts (in some packages)
- Panel screws
- Frame bolts
- Sealing washers
Framed Openings
Your kit will come with framed openings for the doors and windows, tailored to your custom order. These are pre-engineered into the wall framing.
Includes:
- Door/window framing
- Header beams
- Jambs and trim
- Pre-cut openings for exact dimensions
Trim Package
Aesthetic and protective trim pieces are provided to seal edges, corners, and transitions between panels.
Includes:
- Corner trim
- Eave and rake trim
- Base trim
- Ridge caps
- Closure strips (foam closures for sealing)
Sealants & Closures
Sealants help protect the building from water, pests, and air infiltration.
Includes:
- Butyl tape
- Foam closures
- Weather stripping (if applicable)
What’s Not Included in a Kit
Now that we’ve covered what’s standard, here’s a list of what typically is not included – and what you’ll need to source separately or request as add-ons.
Concrete Foundation or Slab
While building plans may include foundation designs, the concrete slab itself is not part of the kit.
You’re responsible for:
- Excavation
- Concrete pouring
- Reinforcement (rebar, mesh)
- Vapor barrier (optional)
Some companies offer turnkey packages with foundation installation, but standard kits do not include materials or labor for this step.
Doors and Windows
Steel building kits typically include framed openings, but not the doors or windows themselves, unless they are specifically ordered.
Optional upgrades available:
- Roll-up garage doors
- Walk-in doors
- Sliding doors
- Insulated windows or skylights
If you’re sourcing your own doors/windows, make sure the dimensions match the framed openings.
Insulation
Insulation is essential for energy efficiency and condensation control – but not included by default in most basic kits.
Add-on options:
- Vinyl-backed fiberglass rolls
- Spray foam
- Rigid foam board
- Vapor barriers
Insulation packages can be customized for roof and wall panels and are highly recommended for climate-controlled buildings.
Interior Finishes & Partitions
If you’re planning to build out interior rooms, add electrical, plumbing, drywall, or HVAC, these are not included in a standard steel kit.
You’ll need contractors for:
- Interior framing
- Drywall or OSB
- Electrical/plumbing rough-in
- Heating/cooling systems
Site Work and Equipment
Your kit arrives as a shipment of materials, but the tools, labor, and heavy equipment for erection are your responsibility (or that of your contractor).
Common site needs:
- Forklift or crane for unloading
- Ladders, lifts, or scaffolding
- Impact drills and wrenches
- Licensed erection crew
Permits and Fees
US Patriot Steel provides engineered drawings; however, you’ll be responsible for acquiring all local building permits and paying any applicable municipal fees.
Pro tip: Always contact your local building authority before purchasing to understand zoning and compliance requirements.
Summary Table
| Component | Included in Kit | Optional / Not Included |
| Engineered Building Plans | Yes | |
| Primary & Secondary Framing | Yes | |
| Roof and Wall Panels | Yes | |
| Fasteners, Bolts, and Trim | Yes | |
| Framed Openings | Yes | |
| Doors & Windows | Optional | |
| Insulation | Optional | |
| Concrete Foundation | Not Included | |
| Interior Build-Out | Not Included | |
| Site Work / Erection Labor | Not Included | |
| Permits | Not Included |
Final Thoughts
Before placing your order, always ask your steel building supplier these questions:
- What exactly is included in this kit?
- Will I need to provide my own foundation or erection crew?
- Can I upgrade to include insulation or doors?
- Are stamped plans provided for my specific location?
At US Patriot Steel, we’re committed to full transparency and outstanding customer support. Whether you need a basic shell or a fully insulated, ready-to-use structure, we’ll guide you through every step of the process.