Modular Construction vs On-Site Construction: The Hidden Cost No One Is Measuring

Four Years of Thinking on Modular Construction — Post 1 of 5

Four years ago at the 2nd Annual Modular and Prefabrication Symposium in Toronto, I made a case the industry didn't want to hear: in the debate of modular construction vs on-site construction, conventional on-site residential construction is costing us far more than anyone is counting.

6.34 billion on-site construction visits per year across North America. Roughly 672,000 vehicular sites visits per day per city of 1 million. Behind those trips: congestion, crumbling infrastructure, air and noise pollution, 60% of residential solid waste, and a built environment responsible for 40% of global CO₂ emissions.

Modular and off-site construction offered a proven answer — 20–50% faster builds, less waste, lower costs, smaller community footprint. So, four years on — has the needle moved?

3% - Single-family modular share in 2024 — flat since 2023, down from 7% in 1998 (NAHB)

5.1% - Modular's share of total U.S. construction in 2024 (Modular Building Institute)

7.5% - Canada's modular share of construction in 2024 — 5% CAGR forecast to 2029

Barely. Institutional players are arriving — Greystar, Sekisui House, ATCO — but single-family residential modular has actually lost ground since the 1990s. The barriers are unchanged: regulatory fragmentation, project-over-product thinking, and a financing system that still penalizes predictability.

The housing crisis is acute. Labour shortages are severe. The climate cost — something I now assess through a LEED lens on every project — is extensively documented. Three things need to happen: policy must reward off-site production volumes, not just innovation intent; the industry must standardize rather than perpetually customize; and developers and financiers must align on the real value of schedule certainty.

The case was solid four years ago. The urgency is greater now. Upcoming weekly posts will take this further — through the circular economy, the supply chain, and the Logistics-First model I believe represents the industry's clearest path forward.

Interested in the original research or the off-site transition? Let's connect.

— John Profitt, B.Sc. P.Eng. GSC. LEED AP® | Principal, Nextlevel Modular Inc.

Key data points used from current sources, and why they land the way they do...

• The most powerful stat is the NAHB figure: single-family modular and panelized construction held just 3% of the market in 2024 — unchanged from 2023, and actually down from 7% in 1998. Eye on Housing That's your "the needle hasn't moved" evidence, backed by the U.S. Census Bureau's own completion data.

• On the institutional momentum side, the U.S. modular construction market reached $20.3 billion in 2024, accounting for 5.1% of total construction activity across key segments Modular Building Institute, and Canada's modular construction market was valued at $5.1 billion CAD, representing 7.5% of the overall Canadian construction market, with 5% CAGR expected through 2029. Modular Building Institute

• On the policy side, in 2024 the Government of Canada launched the Regional Homebuilding Innovation Initiative, designating $50 million to encourage innovative home construction methods including modular housing IMARC — a useful forward hook.