What Is Design-Build? (And What Is Traditional Construction?)
Traditional construction (design-bid-build) is the model most people know: you hire an architect or engineer to design the project, produce drawings, then send those drawings to multiple contractors for competitive bids — at least two contracts, and you're the bridge between them.
Design-build collapses those contracts into one. A single entity — the design-builder — is responsible for both the design and the construction. One contract, one point of accountability, one team managing the project from concept to completion.
Design-Build
- One contract, one accountable team
- Design + construction overlap (faster)
- Continuous pricing during design
- Builder shapes design for constructability
- No finger-pointing between designer and builder
Traditional (Design-Bid-Build)
- Separate contracts for design and build
- Sequential phases (design → bid → build)
- Price known only after bidding
- Competitive tension on price
- More owner control over design
The Cost Comparison: What the Numbers Actually Say
According to the Design-Build Institute of America, design-build projects cost an average of 6.1% less per unit than traditionally managed construction. In Ontario specifically, design-build projects routinely cost 15–20% less overall than traditional methods — even when initial proposals look similar.
“A major residential remodel in Ontario might cost $80,000 via design-build, but $92,000–$111,000 managed through a general contractor in the traditional model.”
Timeline: Design-Build Is 30–35% Faster
In traditional construction, the phases are sequential: design → bid → build. Design-build overlaps design and construction — construction can begin on the foundation while the interior finishes are still being detailed.
Which Project Types Fit Which Model in Ontario?
| Project Type | Best Method | Why |
|---|---|---|
| Custom home | Design-Build | Cost control during design, faster delivery, single accountability |
| Residential addition | Design-Build | Tight urban sites need constructability input from day one |
| Commercial renovation | Design-Build | Phased construction while business operates; coordination critical |
| Industrial facility | Design-Build | Complex MEP and structural coordination benefits from integrated team |
| Municipal / public building | Traditional | Procurement rules mandate competitive bidding |
| Heritage restoration | Traditional | Independent design process needed before construction decisions |
MAY Engineering: Ontario's Complete Design-Build Partner
MAY Engineering offers true design-build delivery — a single team handling engineering, architectural drawings, permit applications, and construction management from concept to closeout. No handoffs, no gaps, no finger-pointing. Licensed Ontario Builder. P.Eng.-supervised. Ontario-wide.
Planning a project in Ontario? Book a free consultation — we'll walk you through which delivery method fits your project and budget.
Ready to build smarter in Ontario?
MAY Engineering delivers complete design-build projects — engineering + design + construction, one team, one contract.
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