Prefabricated Steel Structure Garage

Prefabricated Steel Structure Garage: A Bolt-Together Parking Structure You Can Move

Fleet operators, dealerships and parking developers who lease their land run into the same problem: a conventional concrete parking structure takes 8-12 months to build, and when the lease ends the building stays behind. The capital is spent, the asset is gone, and the next site starts from zero.

This prefabricated steel structure garage is built to be taken apart. Q355B welded H-section columns and rafters form a portal frame that assembles entirely with bolts, so the same prefabricated steel structure garage can be dismantled, loaded into containers and re-erected on a new site. The bolted frame also keeps the foundation within standard strip or pad footing range instead of the deep piling a concrete deck would need.

The problem this prefabricated steel structure garage is designed around

Relocation is the pain point. A bolted portal frame with pre-drilled end plates can be unbolted joint by joint, and the members are light enough to be handled by a standard site crane. Members are fabricated to +/-2mm tolerance on CNC plasma cutting and robotic drilling lines, so the bolt holes line up again on the second site without re-drilling or field welding.

How the prefabricated steel structure garage solution works in practice

• Bolted connections throughout. Columns, rafters, purlins and bracing arrive pre-cut, pre-drilled and pre-welded. Site work is bolting, not fabrication.
• Modular 6-9m bays. Extend the prefab steel garage by bolting on another bay; no cutting into the standing structure and no shutdown of the operating area.
• Multi-level stacking. The frame supports 2-4 levels with integrated steel ramp modules at 10-15% gradient, so parking capacity rises on the same footprint.
• 12-24m clear spans. Column-free bays keep parking aisles, turning radii and door swing unobstructed.

How span and bay spacing work together

Two dimensions are often confused, so they are worth separating. The clear span (12-24m) is the distance across the building between the two column lines - it is the direction vehicles drive through, and it is column-free. The bay spacing (6-9m) is the repeating distance along the length of the building between one frame and the next. A typical single-level layout is an 18m clear span with 7.5m bay spacing, giving roughly 135 m2 of floor area per bay. The number of bays, the parking layout and the resulting steel tonnage are all set in the project structural drawing once your vehicle mix and turning radii are fixed - send us your parking capacity and site dimensions and we will return the layout and the steel weight for your configuration.

What changes when you stack a prefabricated steel structure garage

The 300-400 kg/m2 floor loading figure describes a single-level prefabricated steel structure garage. Once you stack 2-4 levels, the lower columns, floor beams and foundations carry the accumulated load of every level above, so they are re-checked against the full-load case of the upper decks rather than the single-level value. That is why the multi-level full-load case is confirmed in the project structural design per GB 50017 instead of being read off the single-level table. Tell us the number of levels and the vehicle mix and we will return the governing load case for the lower structure.

Technical Specifications

Product Advantages

• Relocatable bolted structure - the frame unbolts and re-erects at a new site; on leasehold land the prefab steel garage is an asset you can move, not a sunk cost.
• Modular bolt-together assembly - all members arrive pre-cut, pre-drilled and welded; no on-site fabrication and no welding equipment required.
• Multi-level stacking - 2-4 level configurations with integrated steel ramp modules at 10-15% gradient.
• Lateral expansion without demolition - 6-9m modular bays let you bolt on another bay without cutting into the existing structure.
• Column-free vehicle circulation - 12-24m clear spans remove interior columns from parking aisles and turning areas.
• Pre-engineered door and window openings - roll-up, sliding and sectional overhead door openings are designed into the frame, so no structural member is cut on site.
• Light foundation requirement - the bolted steel frame keeps foundations in the standard strip or pad range; a site soil survey is recommended to confirm.

Quality Control and Non-Destructive Testing

Welding procedures are qualified to ISO 15614-1 and welders hold ISO 9606 certification. Primary load-bearing welds undergo 100% ultrasonic testing per GB/T 11345; magnetic particle inspection covers secondary connections. Jidian runs its own inspection team for incoming raw material, weld ultrasonic inspection and derusting grade detection, and holds ISO 9001, ISO 14001 and ISO 45001 management system certification plus CE (EN 1090) factory production control certification. Certificate copies with issuing body and scope are available on request. SGS and BV are third-party inspection agencies we can engage for pre-shipment inspection on request; they are not certifications held by the company.

Each shipment includes mill certificates, weld and NDT records, and coating thickness reports.

Production Process and Factory Capability

Fabrication follows a fixed sequence: raw material inspection, CNC plasma cutting, H-section assembly and automated submerged-arc welding, robotic drilling of end plates, shot blasting to Sa 2.5, primer and topcoat application, then trial assembly of the frame before packing. Trial assembly is what catches a mis-drilled plate in the factory instead of on your site.

Jidian is headquartered in Xiamen, Fujian, China, and operates heavy steel, light steel and sandwich panel production lines with a company-wide annual capacity of 360,000 tons of steel structure and 1,000,000 m2 of enclosure output. The company holds China's Steel Structure Manufacturing Special Level Qualification and participates in the formulation and review of Chinese national steel structure standards.

On the company side, prefabricated building and steel structure projects have been delivered to 50+ countries across Europe, the Middle East, Southeast Asia, Africa and the Americas, with 2,000+ completed projects worldwide. These are company-level steel structure figures covering all product lines, not garage-specific case counts. Company-level steel structure references include the 2022 Beijing Winter Olympics venues, the China Academy of Launch Vehicle Technology special steel structure, Beijing Daxing International Airport and the Asian Infrastructure Investment Bank - these are plant, public and commercial building references, not garage product cases. Garage-specific references and the supply scope of each project can be confirmed with our sales team.

Delivery, Transport and Installation

The delivery cycle has three separate stages, and the production figure does not include the other two:

• Production: 15-25 days after drawing confirmation, covering fabrication of the steel structure only.
• Transport: quoted per project by destination and container count; shipped in 40ft HQ containers from Xiamen Port. Container count depends on the final steel weight and member lengths in your drawing, and is confirmed against the packing list before shipment.
• Installation: modular bolt-together assembly on site. As a planning reference, a single-level prefab steel garage of roughly 1,000-2,000 m2 is typically erected by a crew of 6-10 workers over about 15-25 working days, depending on site access and whether a crane is available; larger or multi-level configurations take proportionally longer. This estimate covers unloading, frame erection and cladding only - it excludes foundation and ground works, crane hire, electrical or lighting installation, weather downtime and customs clearance waiting. These are estimates for budgeting only and are confirmed in the project plan before production starts.

Foundation, Installation and Maintenance

Foundation design depends on the steel weight, the number of levels and local soil conditions, so a geotechnical investigation is recommended before finalizing the foundation. Our engineers provide foundation design guidance based on your site report.

Every order includes assembly drawings, connection sequence videos and remote support. On-site engineer supervision is available for multi-level or large projects at the buyer's expense. Maintenance depends on the surface treatment selected: standard coated structures should be inspected periodically and touch-up coated as needed, while galvanized structures require minimal maintenance in most environments.

Warranty and After-Sales Service

Warranty terms are set per project in the supply contract rather than as a single fixed figure, because the applicable scope depends on the surface treatment and the site environment. The framework we work to is:

• Structural steelwork: defects in fabrication and materials are covered for 12 months from delivery, with the structural design life of 50+ years stated separately as a design figure rather than a warranty period.
• Coating system: the standard epoxy zinc-rich primer plus topcoat system is warranted for 5 years against blistering and peeling under normal atmospheric exposure; the hot-dip galvanized option carries a longer term, confirmed per project.
• Common exclusions: damage from impact, overloading beyond the design load, unauthorised cutting or welding on site, and corrosion where the coating system was not matched to the site corrosivity category.
• After-sales response: technical questions are answered within 24 hours on working days. If a fabrication defect is confirmed, replacement members are produced and shipped at our cost; site labour is not included.
• Spare parts: bolts, sealing washers, flashing and panel offcuts can be supplied with the original order or reordered later against the project drawing number.

The exact warranty scope, duration and exclusions for your project are written into the contract before production; contact our sales team for the wording that applies to your configuration.

Purchasing FAQ

What is the MOQ?
One prefab steel garage unit. Price per m2 improves above 300 m2; the exact step is confirmed in the quotation against area and configuration.

What is the production lead time?
15-25 days from drawing confirmation. This is production time only; transport and installation are quoted separately for your project.

How is the prefab steel garage shipped and packed?
Steel bundled with strapping and small parts in iron boxes, loaded in 40ft HQ containers from Xiamen Port. Components are packed in assembly sequence so the crew unloads them in the order they are needed.

What are the payment terms?
T/T (30% deposit, 70% before shipment) or L/C at sight. Alibaba Trade Assurance is supported.

Can I get a sample?
A full prefab steel garage cannot be sampled, but we can supply a cut sample of the H-section steel and a sandwich panel offcut so you can check material and coating before the order.

Do you offer OEM/ODM and custom branding?
Full OEM/ODM. Custom dimensions, door types, colors, and branding on components and packaging.

Do you provide installation support?
Assembly drawings, connection sequence videos and remote support come with every order. On-site engineer supervision for multi-level or large projects is available at your expense.

What do I need to provide for a quote?
Parking capacity (number of vehicles), site dimensions, number of levels, vehicle type (passenger or light commercial), local wind and snow loads, door requirements and cladding preference. Structural design and price within 24 hours.