Stop scope creep in architecture by writing down what is included at kickoff, counting the site visits, submittal reviews, and RFI (request for information) responses your contract actually limits, and sending the additional services request the week the extra work appears rather than after the project closes. Construction administration (CA, the phase after the permit when the building actually gets built) is where the bill comes due, because CA is last, its duration belongs to the contractor, and by then the fee is mostly gone.
The traditional AIA (American Institute of Architects) fee split gives CA 20% of the basic fee. Practitioner consensus puts the actual effort at 25% to 30%. Scope creep is what turns that gap into a loss instead of a nuisance.
What does scope creep in architecture actually look like?
Rarely a single dramatic request. Usually 30 small ones.
The owner approves design development, then brings the new operations director to a meeting and reopens the kitchen layout. The contractor sends 140 RFIs on a project you priced for 40. The plan checker wants the egress diagram on the cover sheet, which means a sheet reissue and a fresh consultant coordination pass. The client’s lender asks for a second set of exhibits nobody scoped.
Each one is defensible on its own. Refusing any single one makes you look difficult. That is exactly why the pattern works, and why the answer has to be a system rather than a mood.
The tell is not the request. The tell is the phase budget. When DD closes at 130% and nobody wrote anything down, you have not had a scope problem, you have had a documentation problem, and the two feel identical until you try to invoice.
Why does the CA phase absorb most of it?
Three reasons stack.
CA is last, so every earlier overrun has already eaten the reserve. If SD and DD ran long and CD ran to the wire, CA starts underwater regardless of what happens on site.
CA is open-ended in a way the design phases are not. You control how long CD takes. The contractor controls how long CA takes, and a two-month schedule slip is two more months of site visits, pay applications, and phone calls with no additional fee attached.
CA rewards responsiveness, which reads as free. AIA A201-2017 Section 4.2.14 requires the architect to respond to RFIs with reasonable promptness, and doing that well is good practice. It is also unpriced when the volume triples.
Set against Deltek Clarity 2026 (the 47th edition of Deltek’s annual study of architecture and engineering firms), which puts operating profit on net revenue at 16.7%, a CA phase running 50% over its budget can take the profit of the whole project with it.
Which numbers in B101 should you be counting?
AIA B101-2017 Article 4 is the part of the agreement most firms sign and never open again. Article 4.1 lists Supplemental Services with a table naming who provides each one. Article 4.2 covers Additional Services, the work you perform and bill beyond Basic Services.
Two provisions do the heavy lifting.
- Section 4.2.1. Changes in the Owner’s instructions, approvals, budget, or schedule after those items were previously given trigger Additional Services. A reopened DD approval is not a favor. It is a listed condition.
- Section 4.2.3. The agreement carries blanks for the number of site visits during construction, submittal reviews, and RFI responses included in the fee. Work beyond those counts is Additional Services.
Here is the practical failure: on most executed B101 agreements we have read, those blanks are either empty or filled in with a number nobody has tracked since the day it was signed. Fill them in during negotiation with a number tied to the construction duration, then track them from the first day of CA. A five-column log (date, RFI or submittal number, hours, cumulative count against the contract limit, notes) is enough.
Count in your phase budget as well as in the log. The count tells you when you are entitled to more fee. The budget tells you when you need it.
How do you ask for additional services without starting a fight?
Ask early, ask small, and ask in writing every time.
A request sent the week the change occurs is a business conversation. The same request sent at 90% construction is an accusation, and the client hears it that way. Timing does more for the outcome than wording does.
Structure the request the same way each time: what changed, why it falls outside Basic Services with the article cited, the proposed scope, the fee as a lump sum or an hourly not-to-exceed amount, the schedule effect, and a signature line. One page. No adjectives.
Two habits make it easier. First, tell the client at kickoff that additional services exist and that you will raise them promptly, so the first letter is not the first mention. Second, price small requests small. A $2,800 request signed in April is worth more than a $30,000 claim argued in November, and it sets the precedent that changes have prices.
If the client declines, you still gained something. You now have a written record that the work was outside the contract, which matters if the project ends badly, and you can decide whether to absorb it deliberately rather than by accident.
What should you set up at kickoff so this is easier?
Scope control is cheapest before anyone has drawn anything.
At project kickoff, confirm four things in writing: the named decision maker and the approval process, what is explicitly excluded, the site visit and review counts from Section 4.2.3, and the point at which a design change becomes a re-approval. Send it as a one-page memo, not buried in a 40-page contract.
Then put a standing line on the weekly internal review: anything logged this week that was not in the scope. Thirty seconds per project. The PM (project manager) either names something or does not, and the ones who name something get the letter sent that day.
Firms that hold their CA fee are not tougher negotiators. They just count things, and they send the letter in April. The rest of the profession discovers the problem in the project post-mortem, which is a fine place to learn and a terrible place to earn.
AECPulse Project Manager tracks logged hours against the CA budget and keeps the RFI and site visit counts against the contract limits, so the additional services conversation starts from a number rather than a feeling.