What Is Design-Bid-Build—and Why Contracts Matter
Design-bid-build is the most widely used project delivery method in construction. In this approach, the owner contracts separately with the design team and the contractor, creating a structured but segmented process.
The project unfolds in three phases:
- Design
- Bidding
- Construction
Because each phase involves different parties and contracts, alignment between agreements is critical. Without it, gaps in responsibility, communication breakdowns, and disputes can emerge.
AIA Contract Documents are designed to provide a coordinated framework that connects these phases into a cohesive system.
How AIA Contract Documents Work Together
AIA documents are not standalone forms. They are designed as an integrated system that defines relationships across the project team.
At a high level, the structure includes:
- Owner–Architect agreement (B101)
- Owner–Contractor agreement (such as A101)
- General Conditions (A201)
- Supporting documents for changes, payments, and administration
A201 is often considered the backbone of this system because it defines the rights, responsibilities, and relationships between the owner, contractor, and architect during construction.
Together, these documents create a single, coordinated framework for how the project is designed, priced, and built.
The Role of Each Party
In design-bid-build, responsibilities are clearly divided—but must remain aligned.
Owner
- Initiates the project
- Contracts separately with the architect and contractor
- Makes key decisions on scope, budget, and schedule
Architect
- Develops the design and construction documents
- Supports bidding and contractor selection
- Administers the contract during construction
Contractor
- Provides pricing during bidding
- Constructs the project
- Coordinates subcontractors and manages execution
Because these roles are defined across multiple agreements, consistency between documents is essential.
Key AIA Documents in Design-Bid-Build
B101: Owner–Architect Agreement
Defines the architect’s services across all project phases, including design, bidding, and construction administration.
This document establishes:
- Scope of services
- Standard of care
- Responsibilities during construction
A101 (or Similar): Owner–Contractor Agreement
Defines how the contractor is compensated and how the work is delivered.
This agreement:
- Establishes contract sum and payment terms.
- Defines the scope of construction work.
- Incorporates A201 by reference.
A201: General Conditions of the Contract for Construction
Defines how the construction contract operates.
It establishes:
- Relationships between owner, architect, and contractor.
- Procedures for payments, changes, and disputes.
- Responsibilities during construction.
A201 is incorporated into both the owner–contractor agreement and referenced alongside B101, creating a shared framework across the project.
How Documents Work Across Project Phases
The construction phase is where contract alignment is tested. If responsibilities are unclear, issues will surface quickly during submittals, payments, and change decisions.
- Design Phase: The architect works with the owner to develop drawings and specifications that define the project. These documents become the basis for bidding.
- Bidding Phase: Contractors submit bids based on the completed design documents. The architect typically assists the owner in reviewing bids and selecting a contractor.
- Construction Phase: The contractor builds the project, while the architect administers the contract. This includes reviewing submittals, observing the work, certifying payments, and interpreting contract documents.
The structure established by AIA documents ensures that these responsibilities are clearly defined and consistently applied.
Connecting Design, Bidding, and Construction
The strength of AIA Contract Documents lies in how they connect each phase of the project:
- B101 defines the architect’s obligations
- A101 defines the contractor’s obligations
- A201 connects both into a single construction framework
This coordination ensures that the design intent is carried into construction, the contractor understands expectations, and the owner has a consistent decision-making structure.
Common Challenges in Design-Bid-Build
Even with strong contracts, challenges can arise:
- Misalignment between design intent and construction execution.
- Incomplete or unclear documentation.
- Changes during construction.
- Communication breakdowns between parties.
Many of these issues stem not from the contracts themselves, but from how they are applied and coordinated.
How This Fits Into the Larger AIA System
Design-bid-build is just one delivery method supported by AIA Contract Documents. Within this method, coordination between agreements is essential.
To understand how these documents connect more broadly, see:
- Essential document pairingsÂ
- B101 and A201 in construction administration
- Preventing scope-related disputes
- Resolving construction disputesÂ
Build a More Connected Contract Framework
Design-bid-build projects rely on multiple agreements working together. With Unlimited Access to AIA Contract Documents, you can ensure your contracts are coordinated, consistent, and aligned across every phase of the project.
Explore how Unlimited helps you manage contracts with greater clarity and confidence.