Cost & Financing

CFS vs. Wood Framing: True Cost per Square Foot in Multifamily Construction

Cold-formed steel (CFS) framing costs more per square foot on raw material ($12–16/SF vs. $8–12/SF for wood), but delivers lower total project cost through podium elimination, fire-retardant treatment avoidance, and lower builder's risk insurance — routinely 24% less expensive than wood at elevated lumber prices according to SFIA 2023 market data.
  • 9-minute read
Who this article is for: Multifamily developers, general contractors, and estimators comparing structural framing systems for 4–8 story multifamily projects in New England.

Full-scope cost comparison of CFS and wood framing for 4–8 story multifamily construction, covering podium elimination, material price volatility, insurance differentials, and schedule compression.

Podium Elimination: The Per-Floor Advantage

Under IBC Chapter 5, Type IIIB wood-frame construction above three stories requires a concrete podium — a non-combustible transfer structure that adds $25–40/SF per podium level (RSMeans 2024). A typical 4-story, 200-unit multifamily project built as Type IIIA wood-over-podium carries at least one full concrete level that exists purely to satisfy code.

Cold-formed steel framing, designed to AISI S100-22 and AISI S240-20, qualifies as non-combustible under IBC Section 602.2. That classification lets panelized CFS walls go from foundation to roof without a podium break — saving an estimated $730K+ per eliminated floor (BuildSteel.org Case Study Library). On a separate 4-story Ohio hotel project with 400 units — fabricated by a different panelizer using a comparable workflow, not an AAC Steel project — the developer documented $1.3M in total savings by switching from wood podium to full-height CFS panels.

For Massachusetts developers facing MGL Chapter 148 fire-safety overlays on top of IBC, the podium math is even more compelling. CFS framing packages that achieve Type IIA or Type IIB classification eliminate podium requirements entirely.

Material Price Volatility: CFS Stability vs. Lumber Swings

Between 2020 and 2023, softwood lumber experienced 300% price swings — from roughly $350/MBF to over $1,700/MBF and back again (Random Lengths, CME Futures Data). Those swings are not academic; they blow up pro formas mid-entitlement and force developers to re-bid after permit.

CFS pricing, tied to flat-rolled steel coil, has historically moved in a narrower band. Steel is recyclable, globally traded, and sourced from multiple domestic mills — giving fabricators the ability to lock pricing 90–120 days out with mill-direct contracts. That budget certainty has measurable value: developers who switch to CFS report fewer change orders and tighter contingency draws (SFIA Member Survey 2023).

Insurance and Risk: Savings Over 30 Years

Builder’s risk insurance premiums reveal how underwriters actually price combustibility. CFS-framed projects carry builder’s risk rates of 1–1.1 cents per $100 insured per month; wood-framed projects run 5–6 cents per $100 per month (SFIA Insurance Benchmark Report) — a 4–5× premium differential during the construction phase alone.

Over a 30-year hold period, CFS-framed multifamily buildings deliver 38% average insurance savings compared to wood-frame equivalents when factoring builder’s risk, property, and liability coverage (BuildSteel.org Lifecycle Cost Analysis). For a 200-unit asset valued at $40M, that translates to hundreds of thousands in cumulative savings.

Code Compliance and Fire Rating Advantages

CFS framing achieves non-combustible classification under IBC Section 602.2 without chemical treatment. Wood framing requires fire-retardant treatment (FRT) for Type IIIA, adding $1.50–3.00/SF and introducing long-term concerns about FRT chemical degradation documented in AWPA standards.

UL-listed CFS wall assemblies (e.g., UL U425, U431) achieve 1-hour and 2-hour fire ratings with standard gypsum layers, arriving on site pre-engineered for consistent fire-rated assembly quality that field-framed wood cannot match. Wind and seismic loads are addressed per ASCE 7-22, with CFS shear walls designed to AISI S400-20 providing ductile lateral resistance.

Panelized CFS framing is fabricated off-site with CNC precision, arriving labeled and sequenced for erection — eliminating the skilled-carpentry bottleneck that slows wood stick-framing in today’s labor market. Field data from CFS panelizers shows 20–30% schedule compression versus stick-frame wood (SFIA Speed-to-Market Report). On a 150-unit project, that can mean 8–12 weeks of saved carrying cost on construction loans — worth $15K–$25K per $10M in project value, per month saved, at current interest rates.

Full Cost Comparison: CFS vs. Wood

Cost Category Wood Frame (Type IIIA/IIIB) CFS Frame (Type IIA/IIB)
Framing material ($/SF) $8–12 $12–16
Podium structure ($/SF) $25–40 (1 level required) $0 (not required)
Fire-retardant treatment $1.50–3.00/SF $0 (inherently non-combustible)
Builder’s risk insurance 5–6 cents/$100/mo 1–1.1 cents/$100/mo
Schedule (months) 14–18 10–14

Over a 30-year hold period: insurance savings run 38% lower with CFS (BuildSteel.org), podium cost avoidance runs $730K+ saved per floor (BuildSteel.org), and total documented project savings reached $1.3M on a 400-unit reference project (SFIA Case Study), with comparative framing cost at elevated lumber prices running 24% less expensive with CFS (SFIA 2023).

Frequently Asked Questions

Is CFS framing more expensive per square foot than wood?

On a raw framing-material basis, yes. RSMeans 2024 shows CFS at $12–16/SF vs. wood at $8–12/SF. But total project cost — including podium elimination, insurance, schedule savings, and FRT avoidance — typically makes CFS 24% less expensive at elevated lumber prices.

Does CFS meet fire code for multifamily?

Yes. CFS is classified as non-combustible under IBC Section 602.2. UL-listed assemblies such as U425 and U431 achieve 1-hour and 2-hour fire ratings.

How much does podium elimination save on a multifamily project?

Eliminating one concrete podium level saves an estimated $730K+ per floor according to BuildSteel.org case study data. On a separate 4-story, 400-unit reference project, a developer documented $1.3M in total savings by switching from wood-over-podium to full-height CFS panels. For Massachusetts developers facing MGL Chapter 148 fire-safety overlays on top of IBC, the podium math is even more compelling because CFS Type IIA/IIB classification eliminates the podium requirement entirely.

What is the builder’s risk insurance differential between CFS and wood?

CFS-framed projects carry builder’s risk rates of 1–1.1 cents per $100 insured per month. Wood-framed projects carry 5–6 cents per $100 per month — a 4–5× premium differential during the construction phase alone. Over a 30-year hold period, CFS-framed multifamily buildings deliver 38% average insurance savings compared to wood-frame equivalents.

References

  • RSMeans — Building Construction Cost Data, 2024 Edition.
  • Steel Framing Industry Association (SFIA) — 2023 Market Report; Insurance Benchmark Report; Speed-to-Market Report; Member Survey 2023.
  • BuildSteel.org — Case Study Library; Lifecycle Cost Analysis.
  • Random Lengths / CME Futures Data — Softwood lumber pricing 2020–2023.
  • International Code Council — IBC 2021: International Building Code, Chapter 5, Section 602.2, Section 1207.
  • American Iron and Steel Institute — AISI S100-22, AISI S240-20, AISI S400-20.
  • American Society of Civil Engineers — ASCE 7-22.
  • ASTM International — ASTM A653.
  • American Wood-Preservers’ Association — AWPA standards for fire-retardant treatment of wood.
  • Underwriters Laboratories — UL Fire Resistance Directory: UL Designs U425, U431.

Get a CFS Cost Comparison for Your Next Project

AAC Steel provides free design-assist estimates for multifamily developers evaluating cold-formed steel framing. Our Franklin, MA facility serves projects across New England with panelized CFS wall systems engineered to IBC, AISI, and ASCE 7-22 standards. Contact our engineering team at nick@aacsteel.com or 617-560-0349 to request a project consultation and full-scope cost comparison for your specific project.

About AAC Steel

AAC Steel is a cold-formed steel (CFS) framing company headquartered in Franklin, MA, founded by engineers and builders with two decades of experience on Northeast jobsites. The company designs, fabricates, and installs precision CFS structural systems — including PE-stamped engineering, BIM and shop drawings, and panelized fabrication — for 5+ story multifamily developments across Massachusetts, Rhode Island, and Connecticut.

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