Why Fixed Price Contracts Are Better Than Cost Plus Fixed Percentage Contracts
Key Advantages of Fixed Price Design-Build
Financial Protection:
- Known project budget established upfront
- Cost certainty before construction begins
- Client protected from cost overruns
- Enables proper financial planning
Aligned Incentives:
- Contractor motivated to control costs and work efficiently
- Incentive to negotiate best prices from subcontractors
- Client and contractor goals fully aligned
- Contractor bears risk, ensuring careful planning
Accountability & Transparency:
- Clearly defined scope of work
- Collaborative design process
- Enhanced accountability throughout project
- Stable financial commitment
Professional Excellence:
- Demonstrates contractor competence and well-defined processes
- Proven ability to deliver predictable results
- Minimized potential for disputes
Key Problems with Cost Plus Fixed Percentage
Financial Risk:
- No predetermined budget or guaranteed maximum price
- Uncertain final project cost
- All cost overruns passed to client
- Unlimited financial exposure
Misaligned Incentives:
- Contractor profits more when costs increase
- No economic motivation to control costs or work efficiently
- No incentive to negotiate best prices
- Higher costs = higher contractor profit
Limited Accountability:
- Client bears all project risks
- Complex cost tracking creates dispute opportunities
- Difficult to verify actual costs
- Unclear responsibility for overruns
Process Deficiency:
- Often indicates lack of well-defined contractor processes
- Non-binding estimates without guarantees
- Contractor uncertainty transferred to client
Bottom Line
Fixed price design-build protects clients through cost certainty, aligned incentives, clear accountability, and efficiency-driven execution.
Cost plus percentage contracts expose clients to unlimited risk, create conflicting incentives, and reward inefficiency—making fixed price the superior choice for predictable outcomes and controlled costs.
