Texas construction projects increasingly use two dominant delivery methods: Design-Bid-Build (DBB) and Design-Build (DB). Each method affects how estimators approach pricing, scope development, and risk management. Whether you’re bidding on a school in Austin or a highway project in El Paso, understanding the nuances of these models is essential for accurate estimating and successful execution.
This guide breaks down the key differences between DBB and DB, explains how they impact estimating workflows, and includes a comparison table to help Texas contractors choose the right approach.
What Are Design-Bid-Build and Design-Build?
- Design-Bid-Build (DBB): The traditional method where the owner hires a designer to complete plans, then solicits competitive bids from contractors. Estimators price based on finalized documents.
- Design-Build (DB): A single entity (often the contractor) is responsible for both design and construction. Estimators work with preliminary plans and collaborate with designers to shape scope and pricing.
Comparison Table: Estimating for DBB vs. DB
| Feature | Design-Bid-Build (DBB) | Design-Build (DB) |
| Timing of Estimate | After design is complete | During early design phases |
| Document Completeness | Full drawings and specs | Preliminary or evolving documents |
| Pricing Method | Competitive lump sum bids | Budgeting, GMP, or negotiated pricing |
| Estimator’s Role | Quantify scope from fixed plans | Collaborate with design team to shape scope |
| Risk to Contractor | Higher risk of scope gaps or missed details | Shared risk through design coordination |
| Flexibility | Low — scope is fixed | High — scope evolves with input |
| Owner Involvement | High during design, low during construction | Continuous throughout project |
| Texas Use Cases | Public schools, municipal buildings, TxDOT | Healthcare, higher education, private development |
Sources: Procore, 4M Analytics, SMAMEP Estimate
Estimating Challenges in Each Method
Design-Bid-Build
- Pros:
- Clear scope and specs
- Competitive pricing
- Easier to benchmark costs
- Cons:
- Limited flexibility
- Higher risk of change orders
- No input on design efficiency
Design-Build
- Pros:
- Early involvement in design
- Better cost control
- Fewer change orders
- Cons:
- Requires conceptual estimating skills
- Pricing may shift as scope evolves
- More collaboration needed
Estimating Tips for Texas Contractors
| Tip | DBB Projects | DB Projects |
| Use CSI formatting | Aligns with bid documents | Helps organize evolving scope |
| Validate quantities carefully | Prevents scope gaps | Supports budget development |
| Include allowances | Covers unknowns like testing or permits | Helps manage design uncertainty |
| Review specs line-by-line | Ensures compliance and avoids rework | Identify areas for value engineering |
| Coordinate with subs early | Confirms pricing accuracy | Helps shape scope and design decisions |
| Document assumptions clearly | Protects against disputes | Clarifies budget limits and scope boundaries |
Final Thoughts
Estimating for Design-Bid-Build vs. Design-Build in Texas isn’t just about pricing it’s about strategy. DBB requires precision and thoroughness, while DB demands flexibility and collaboration. Contractors who understand both models can tailor their approach to the project type, client expectations, and risk profile.
At MSB Estimating, we help Texas contractors navigate both delivery methods with confidence. Whether you need a competitive bid for a DBB project or a conceptual budget for a DB proposal, we deliver accurate, CSI-formatted estimates that help you win work and protect your margins.
Need Help Estimating Your Next Texas Project?
Contact MSB Estimating today to get expert support for DBB and DB projects across Texas.
