What Drives the Cost of a Portal Frame Workshop: A Buyer’s Breakdown

What actually drives the FOB price of a portal frame workshop?

Buyers usually ask for “price per square metre” first. The honest answer is that the figure moves within a wide band — our own quotations for complete main and secondary framing land between $55 and $95 per m² FOB — and three project inputs decide where you sit in that band: local peak wind speed, snow load, and whether an overhead crane is specified. A 10,000 m² shed in a 250 km/h typhoon zone with a 20 t crane is a fundamentally different structure from the same footprint in an inland logistics park.

This is why a quote issued without your load data is worthless. We ask for the 50-year peak wind speed at your site before an engineer touches the model.

Why crane capacity changes the column, not just the runway beam

A frequent misunderstanding: buyers assume adding a crane only means adding a crane beam. In a portal frame, the H-section columns must be pre-welded with heavy-duty corbels, and the frames in the crane bay need rigid bracing to control lateral drift under dynamic load. For workshops running cranes 24/7, we perform anti-fatigue dynamic calculations on the columns and corbels rather than a static check — that is the difference between a structure that survives ten years of high-frequency lifting and one that develops fatigue cracks at the corbel weld.

Practical range we build to: 5 t to 50 t overhead cranes, with the corbel welded and inspected in the factory, never on site.

The hidden cost most quotes ignore: ocean freight

For long-span steel, freight can quietly rival the steel bill. Two decisions in the design phase control it:

• Beam segmentation. Main beams over 12 m are split into two or three sections during detailing so every component fits the 11.8 m internal length of a 40HC container. This avoids Open Top containers and break-bulk vessels entirely.
• 3D nested loading. Before dispatch our logistics engineers simulate the load: slender secondary members are nested into the web grooves of large H-beams, and 3D trusses are flat-packed into 2D frames. Container utilisation is pushed past 90%.

On a recent 15,000 m² warehouse for a Malaysian EPC contractor, nested loading removed two 40HC containers from the shipment.

Coastal sites: what an upgraded coating system actually specifies

“Marine grade” means nothing without numbers. For high-salinity sites we mandate: surface preparation to Sa 2.5 (ISO 8501-1) with a 45–75 µm anchor profile, then a multi-layer system under ISO 12944 for C5/CX environments — zinc-rich epoxy primer, micaceous iron oxide intermediate, polyurethane or fluorocarbon topcoat. Dry film thickness is verified on 100% of members against the 90/10 rule. Secondary purlins move to galvanised coil with a Z275 zinc coat.

Which documents your third-party inspector will actually ask for

Approval delays are usually paperwork, not steel. The Manufacturing Data Report we issue with each shipment contains mill test reports to EN 10204 3.1, ultrasonic testing records for every complete-joint-penetration weld (ISO 17640 / ASTM E164, acceptance to ISO 11666 Level 1 or AWS D1.1), coating inspection logs, and the Declaration of Performance for CE marking under EN 1090. A UAE procurement director we supply had his third-party inspector release the shipment on the first visit because the MTR chain was complete.

Realistic lead time, broken down

For a 10,000 m² heavy portal frame workshop the standard cycle is 40 to 50 days: 1–2 weeks from contract to 3D models and shop drawings for your approval, then 4–5 weeks for procurement, CNC fabrication, welding, coating and container loading once drawings are frozen. The drawing-approval window is the part buyers control — every day of review sits directly on the critical path.