4.2 AIA B101: Services Structure & Compensation

Structuring Services in the B101

The AIA B101 carefully categorizes the work an architect performs to ensure clear expectations and fair compensation. Services are divided into three main buckets: Basic Services, Supplemental Services, and Additional Services. Properly scoping these services is fundamental to practice management and financial health.

Basic Services

Article 3 of the B101 defines the Architect's Basic Services. These form the traditional five phases of architectural design and delivery. The architect is responsible for managing the project, coordinating consultants, and communicating with the owner throughout these phases.

1. Schematic Design (SD): Developing the preliminary design, evaluating alternatives, and establishing the general scale and relationship of project components based on the owner's program, schedule, and budget. The Architect submits a preliminary estimate of the Cost of the Work.
2. Design Development (DD): Refining the design, finalizing materials, structural, mechanical, and electrical systems. The documents become more detailed, establishing the size and character of the project. The cost estimate is updated to reflect this greater detail.
3. Construction Documents (CD): Producing the detailed drawings and specifications required for bidding and construction. These documents must set forth in detail the requirements for the construction of the project. The cost estimate is updated again.
4. Procurement (Bidding/Negotiation): Assisting the Owner in obtaining competitive bids or negotiated proposals, and awarding contracts for construction. This includes distributing bid documents, answering bidder questions, and helping evaluate the results.
5. Construction Phase Services (CA - Construction Administration): Acting as the Owner's representative during construction. Crucially, the B101 limits the Architect's site visits in Basic Services to intervals appropriate to the stage of construction (not constant supervision). The Architect reviews submittals, answers RFIs, issues Architect's Supplemental Instructions (ASIs), and certifies Applications for Payment to verify that work is progressing according to the contract documents.

Basic Services typically include standard structural, mechanical, and electrical engineering services. The Architect hires these consultants directly and is responsible for coordinating their work.

Supplemental Services

Article 4 lists Supplemental Services. These are services that are not part of Basic Services but are known to be required at the time the contract is signed.

Examples include:

• Programming and space planning
• Multiple preliminary designs or complex site evaluations
• BIM management and detailed modeling
• Landscape architecture and civil engineering
• Interior design and FF&E selection
• Detailed cost estimating (beyond the standard preliminary estimates)
• Fast-track design services or phased construction coordination
• LEED or sustainability certification administration

When filling out the B101, the Architect and Owner go through a matrix and assign responsibility for each Supplemental Service to either the Architect, the Owner, or "Not Provided." If assigned to the Architect, compensation for these services must be explicitly added to the contract as a distinct line item or separate fee structure.

Additional Services

Additional Services, also found in Article 4, are services that become necessary after the contract is executed, usually due to unforeseen circumstances, Owner-driven changes, or failures by other parties.

The Architect must notify the Owner promptly and wait for written authorization before proceeding with Additional Services. Failing to get written authorization can result in the Architect performing the work for free, as the Owner can claim they did not approve the extra cost.

Examples of Additional Services include:

• Revising previously approved documents due to a change in the Owner's instructions or budget.
• Responding to an excessive number of RFIs or submittals due to a poorly performing contractor.
• Preparing for and attending dispute resolution proceedings.
• Evaluating an extensive number of contractor substitution requests.
• Providing services more than 60 days after the originally scheduled date of Substantial Completion (meaning the project is severely delayed through no fault of the Architect).

Compensation Models

Article 11 covers compensation. Architectural fees are not one-size-fits-all, and the B101 accommodates several compensation models tailored to the project's complexity and risk profile.

1. Stipulated Sum (Fixed Fee): A specific, total dollar amount for the Basic Services. This is common when the scope is clearly defined. It incentivizes the Architect to be efficient, but shifts the risk of scope creep or prolonged design iterations onto the Architect if not carefully managed through Additional Services clauses.
2. Percentage Basis (Percentage of the Cost of the Work): The fee is calculated as a percentage of the final construction cost. As the project size or quality increases, the fee increases. However, if the project is heavily value-engineered down, the Architect's fee decreases, even though redesigning for value engineering often requires more effort. This can create a misalignment of incentives.
3. Hourly Billing Rates (Time and Materials): Compensation is based on the actual hours worked by the firm's staff, multiplied by agreed-upon hourly rates. This is often used for undefined scopes, Supplemental Services, or Additional Services. Owners often request a "Not to Exceed" cap on hourly contracts.

Fee Allocation by Phase: When using a Stipulated Sum or Percentage Basis, the total fee is typically allocated across the five phases. While the exact percentages can vary by practice and project, a standard historical breakdown often looks like this:

• Schematic Design: 15%
• Design Development: 20%
• Construction Documents: 40% (The most labor-intensive phase)
• Procurement: 5%
• Construction Phase: 20%

Invoicing, Reimbursable Expenses, and Withholding Payment

Payments are typically due monthly, in proportion to the services performed. The architect submits an invoice detailing the progress made in each phase.

Reimbursable Expenses: The contract also covers Reimbursable Expenses, which are costs incurred by the Architect directly related to the project. These include printing, travel, permitting fees paid on the owner's behalf, and specialized postage. These are usually billed to the owner at cost plus a small markup to cover administrative handling.

Right to Withhold Services: A critical protective mechanism for the Architect is the right to withhold services. If the Owner fails to make payments according to the contract (e.g., they are 90 days late on an invoice), the B101 allows the Architect to suspend services after providing 7 days' written notice. The Architect is not liable for delay damages resulting from a valid suspension for non-payment.

Furthermore, if the project is suspended by the Owner for more than 90 cumulative days, the Architect may terminate the agreement, protecting the firm from being locked into an indefinitely stalled project.