The Original Contract Doesn't Cover Everything - Knowing How to Modify It Protects the Architect's Fee
Every architecture project involves some scope beyond what was anticipated at contract signing. The owner adds a building addition; the program expands after schematic design approval; a site condition discovered during design requires additional analysis; the building department requests significant plan revisions during permit review. When the architect's scope of work expands beyond the original agreement, the architect is entitled to additional compensation - but only if the additional work is properly identified, communicated, and authorized before (or promptly after) it is performed. Architects who perform additional work without written authorization and then request compensation after the work is done typically lose the fee argument. Understanding how additional services are authorized under the AIA B101 and how the contract is formally amended for larger scope changes is a practice management skill tested on the ARE PjM exam.
Additional Services in AIA B101
The AIA B101 Owner-Architect Agreement distinguishes between Basic Services (the core design and construction administration services included in the base fee) and Additional Services (services that the owner can request beyond the basic scope, for which additional compensation is due). Additional services identified in B101 Section 4.1 (listed additional services) are pre-authorized for the architect to perform if requested by the owner - no separate authorization is required, only notification to the owner before performing the service. Additional services listed in B101 Section 4.2 (contingent additional services) require the owner's written authorization before the architect performs them. These distinctions matter: if the architect performs a Section 4.2 contingent additional service without written owner authorization, the architect may not be able to collect the additional fee.
When Formal Amendments Are Required
Changes to the Owner-Architect Agreement that affect: (1) the total project scope beyond the original program; (2) the base compensation; (3) the project schedule; or (4) the insurance requirements or indemnification provisions - should be handled through a formal contract amendment signed by both parties. An amendment is a written modification to the original agreement, referencing the original agreement and clearly stating what is being changed and what the new terms are. For smaller scope additions (additional CA site visits, a feasibility study for a building addition, peer review services), a simpler Additional Services Authorization form (AIA G802) is often used - a lighter-weight document that authorizes the specific additional service, states the scope and fee, and requires the owner's signature.
Managing Additional Services Requests
The best practice: when a scope change arises, notify the owner in writing promptly (before performing the work if possible). Include a description of the additional scope, why it is beyond the original contract, and the estimated fee. Request written authorization. Keep a running log of all additional service requests, authorizations, and fees. If the client resists additional service authorization, the architect must decide whether to absorb the cost to maintain the relationship or to hold firm on the additional fee. This is a professional judgment call - but the architect who regularly performs unrecompensed additional work without raising it trains the client to expect free extra services.
Key Exam Points
- Basic services: included in base fee per B101; architect must perform without additional compensation.
- Additional services (Section 4.1): pre-authorized; notify owner before performing; additional fee due.
- Contingent additional services (Section 4.2): require owner written authorization BEFORE performing.
- Contract amendment: for significant changes to scope, fee, schedule, or contract terms; signed by both parties.
- AIA G802: simpler Additional Services Authorization form for smaller additional service authorizations.
AREprep's PjM project management content covers AIA B101 contract structure, additional services authorization, contract amendments, and scope management - giving ARE PjM candidates the contract modification knowledge the exam tests in practice management scenario questions about how the architect-owner agreement is maintained and modified as the project scope evolves through design and construction.
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