Steel Building Quote Comparison: The 5 Numbers That Actually Matter (Beyond Price Per Square Meter)

The Cheapest Quote Trap

You have three quotations on your desk. Supplier A: USD 82/m². Supplier B: USD 95/m². Supplier C: USD 78/m². The obvious choice is C. And it is probably wrong.

Here are the five numbers you should be comparing instead.

What to Check	The Trap	The Right Number
Steel tonnage (kg/m²)	Quoting 29–32 kg/m² = under-designed	38–42 kg/m² for 5,000 m² warehouse under GB 50017
Coating spec	"Painted finish" without DFT = 3–5 year lifespan	Epoxy zinc-rich + MIO + PU, DFT ≥ 250μm = 20+ years
Bolt grade	"Standard bolts" = field-weld dependency	Grade 10.9, CNC pre-drilled, 100% bolt-together
Purlin gauge	1.5mm to cut cost = wind uplift risk	2.0–2.5mm, matched to local wind load zone
Engineering docs	Excluded from quote = USD 3,000–8,000 "design fee" later	Included: structural calcs, shop drawings, MTCs, install manual

 

The Real Cost Formula

 

True cost = (Quote price × design adequacy factor) + (erection time × daily site cost) + (maintenance cost × building lifespan)

A building that costs USD 78/m² on paper and requires three weeks of field welding plus repainting in year five is more expensive than the USD 95/m² option that assembles in six weeks and requires zero maintenance for 25 years.

 

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