How a project is procured shapes how it should be estimated. This guide surveys the major delivery methodologies used globally. ConstrCalc is compatible with all of them — you enter the values, ConstrCalc does the math.
Design-Bid-Build (DBB)
The traditional method. Owner commissions an architect for full plans, then invites contractors to bid competitively. Lowest responsive bidder typically wins. Best for clearly defined scopes, weakest for schedule pressure.
Design-Build (DB)
Owner contracts a single entity for both design and construction. Faster than DBB, better cost certainty early, but less design flexibility once contracted. Common for warehouses, standardized commercial, some residential.
Construction Management at Risk (CMAR)
Owner hires a construction manager during design to advise on constructability and cost. The CM then delivers the project under a Guaranteed Maximum Price (GMP). Common for large commercial, healthcare, education projects.
Turnkey
Contractor delivers a fully finished, immediately usable project — design, build, finishes, and often furniture. Owner writes one cheque. Common for factories, franchise buildouts, some hospitality projects.
Public-Private Partnership (PPP / P3)
Private partner finances, designs, builds, and often operates a public asset for a concession period. Used for highways, bridges, hospitals, airports globally.
Each methodology changes what goes into your Overhead, Profit, and contingency lines. ConstrCalc does not enforce a choice — enter your numbers based on your contract.