Managing Additional Services Requests and Contract Modifications

How architects identify, document, and negotiate additional services beyond the original scope of work, including the contractual tools, fee structures, and risk management strategies that protect the firm while maintaining strong client relationships.

ARE · Project Management

Overview

Every project changes. Owners revise programs, jurisdictions add requirements, site conditions surprise everyone. The question isn't whether additional work will arise. It's whether you get paid for it.

Managing additional services is one of the most consequential skills in project management because it sits at the intersection of scope, money, and trust. Done well, it protects the firm's revenue while keeping the client relationship intact. Done poorly, it creates unpaid labor, legal exposure, and resentment on both sides.

The AIA contract document family provides specific tools for this: G801 for notifying the owner that additional services are being triggered, and G802 for formally amending the owner-architect agreement when scope, compensation, or terms need to change. Understanding when each tool applies, and how to use them before the work is performed rather than after, separates profitable practices from firms that quietly absorb scope creep.

For the ARE, you need to know how to distinguish basic services from additional services, what triggers the right to additional compensation, and what documentation steps protect both parties. You also need to recognize the difference between a legitimate scope addition and scope creep that should have been caught during contract negotiation. Getting this wrong doesn't just cost the firm money. It exposes the practice to disputes that consume time, erode trust, and distract from the actual work of designing buildings.

Essential

What Separates Basic Services from Additional Services The line between basic services and additional services is drawn in the contract. It sounds obvious, but this is where most disputes originate. If the contract doesn't explicitly include a service, and the architect performs it anyway, recovering payment becomes an uphill fight. Basic services typically cover the standard phases of design: schematic design, design development, construction documents, bidding/negotiation, and construction administration. Additional services are anything the architect performs beyond that defined scope. Here's what commonly falls outside basic services. According to public agency fee guidelines, excluded services can include detailed cost estimating, detailed fire protection permit drawings and hydraulic calculations, fire alarm system permit drawings, LEED certification work, specialized structural evaluations like non-linear analysis, testing agency services, geotechnical engineering, building information modeling, historic preservation services, and furniture, furnishings, and equipment design.

Professional

Consider a mid-size architecture firm working on a mixed-use development. During design development, the owner decides to pursue LEED Gold certification, a service not included in the original agreement. The project architect recognizes this as additional work, but the principal hesitates to send a formal notice because the client relationship is going well and the firm wants the repeat business. This hesitation is where firms lose money. The right move is to send AIA G801 promptly, framing the notice as professional documentation rather than a confrontation. The notification should reference the specific contract section that defines basic services, identify what falls outside that scope, and propose how the additional work will be compensated. Most clients respect this approach because it demonstrates the architect is managing the project professionally. Once the owner agrees, the firm prepares AIA G802 to formally amend the agreement.

TLDR

Additional services = anything outside the scope defined as basic services in the contract. If the contract doesn't include it, you bill separately for it.
AIA G801 = notification to owner that additional services are being triggered. Send this BEFORE you do the work.
AIA G802 = formal amendment to owner-architect agreement for scope, compensation, or term changes.
AIA G803 = same concept but for modifying architect-consultant agreements.
Owner's written authorization is required before performing additional services. No written request = weak claim for payment.
RFIs that weren't prepared per the contract documents or that ask for information already in the drawings entitle the architect to additional compensation (B101 Section 4.2.2.2).
Common excluded services: LEED certification, BIM, detailed cost estimating, geotechnical engineering, historic preservation, specialty structural analysis.
Reimbursable expenses: some agencies cap markup at 1.1x direct vendor cost. Specialty consultant service charges capped at 10% in some jurisdictions.
Scope precision in the original contract is the single best defense against unpaid scope creep.
Don't confuse additional architect services (G801/G802, owner-architect) with construction change orders (G701, owner-contractor). Different relationships, different documents.

ELI5

Think about hiring someone to paint your living room. You agreed on a price for the living room. Then halfway through, you say, "Hey, can you also paint the hallway?" The painter has every right to say, "Sure, but that's extra." That's what additional services are in architecture. When an architect signs a contract with a building owner, the contract spells out exactly what work the architect will do. Schematic design, design development, construction documents, and so on. That's the "living room" they agreed to paint. But projects change. The owner wants to add a floor. Or the city requires a special environmental study nobody expected. Or the contractor keeps sending questions about things that are already clearly shown in the drawings. When any of these things happen, the architect needs to say, "That's extra work, and here's how we're going to handle it.

AREProject Management

Managing Additional Services Requests and Contract Modifications

2 min read224 words

Managing Additional Services Requests and Contract Modifications

Want to track your progress and access more study tools?

Create a free account