PEB vs Conventional Steel Frame: Cost Breakdown from 3 Projects

I get asked this question at least twice a week: should we go pre-engineered or stick with conventional steel frame? The answer depends on your project, but here are real numbers from three builds I was involved with in 2025.

Project 1: 5,000 sqm Warehouse in Riyadh

The client wanted a clear-span warehouse for logistics. No mezzanine, no crane, just open floor space with 12m eave height.

• Pre-engineered metal building (PEB): $42/sqm for structural steel + cladding
• Conventional steel frame: $58/sqm for the same scope
• Savings with PEB: 27.6%

The PEB won because the design was simple. Repetitive bays, no special loads, standard wind and seismic requirements for the region.

Project 2: 2,000 sqm Manufacturing Plant in Lagos

This one had a 10-ton overhead crane, heavy floor loads, and a 200 sqm office block attached.

• PEB with custom modifications: $67/sqm
• Conventional frame: $71/sqm
• Savings with PEB: only 5.6%

When you start customizing a PEB heavily, the cost advantage shrinks. The factory saves on fabrication time, but engineering hours eat into the margin.

Project 3: 8,000 sqm Cold Storage in Nairobi

Cold storage adds insulation thickness requirements that affect panel spans and purlin spacing. The client needed -25C capability across 6,000 sqm with a 2,000 sqm ambient loading dock.

• PEB: $55/sqm (structure only)
• Conventional: $52/sqm

Conventional actually won here. The non-standard purlin spacing needed for 200mm sandwich panels meant the PEB supplier lost their fabrication efficiency.

The Decision Framework

Use PEB when: clear spans under 60m, standard loads, repetitive bay spacing, and you need fast delivery (PEB ships 8-12 weeks vs 14-18 for conventional).

Use conventional when: heavy crane loads above 20 tons, non-standard geometry, or when local fabrication is cheaper than importing a PEB package.

The 30% cost saving that PEB suppliers advertise is real but only for projects that fit their standard parameters. Once you start adding exceptions, that gap closes fast.