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Architect additional services without an amendment: what the agreement says, and how to count the hours

Architect additional services done without an amendment start with an ordinary moment: in a meeting the client asks to see one more option, the team draws it, and the hours land on the original fee because writing the amendment was nobody’s job. The definitions are easy to find. This guide covers the office side that decides the money: where “one more option” sits in the 2017 AIA owner–architect agreement, what California requires in the contract of every architect and engineer, what the federal architect-engineer clause says about extra-fee work, a count a firm can run on its last ten projects, and the one-line log that turns a freebie into a decision. Lumina is not an architecture or engineering firm, and nothing here is legal advice; read the firm’s own agreements with its attorney.

By , founder of Lumina Business Advisory · Updated · Sources checked · Editorial standards

Basic, Supplemental and Additional Services: where “one more option” falls

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Hand-off 3 of 6 · Contract → Delivery

When signed work starts, does the team work from the same written scope the client signed?

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Answer it in the Self-Audit

If a firm’s agreement is AIA Document B101–2017, or a form built on it, the line is drawn in three places. Section 3.1 says that services not set forth in Article 3 are Supplemental or Additional Services. In the schematic design phase, Section 3.2.4 has the architect prepare and present a preliminary design for the owner’s approval — one design, in the singular.

Supplemental Services, in Section 4.1.1, are services listed in the agreement that are not part of Basic Services but may be needed. They are chosen when the agreement is signed, by designating who is responsible for each one, and the list includes “Multiple preliminary designs” (Section 4.1.1.2). If neither party is designated for a listed service, the agreement treats it as not being provided. So a second and third schematic option is not free by default under the standard form; it is either priced up front as a Supplemental Service or it arrives later as an Additional Service.

Additional Services, in Section 4.2, are the ones that arise after the agreement is signed. Except for services required by the architect’s own fault, they entitle the architect to compensation under Section 11.3 and a schedule adjustment. Section 4.2.1 lists the services that need the owner’s written authorization before the architect proceeds — among them work caused by a change in the owner’s previous instructions or approvals, a material change in the project’s size, quality, complexity, schedule or budget, and owner decisions not made in time. The architect is to notify the owner with reasonable promptness and explain the facts. Section 4.2.2 treats a short list of construction-phase services differently: they proceed to avoid delay, and the owner may stop them by written notice.

Public agencies and corporate clients may write their own agreements, and a firm may edit the standard form. The section numbers above are the standard 2017 text; the clause that binds a project is the one in its signed agreement.

California makes the additional-services procedure a contract requirement

In California, the procedure is not only good practice. Business and Professions Code section 5536.22(a) requires an architect to use a written contract, executed before work begins unless the client knowingly states in writing that work may start first. Among the items the contract must include, paragraph (a)(5) requires “a description of the procedure that the architect and the client will use to accommodate additional services and contract changes,” including changes to the project description, the services and the compensation.

Engineers have a parallel rule. Section 6749(a) requires a professional engineer to use a written contract with the same timing, and paragraph (a)(4) requires “a description of the procedure that the professional engineer and the client will use to accommodate additional services.” Subdivision (c) says a written contract includes one in electronic form.

Both sections carry exemptions worth reading in full. Section 5536.22(b) excludes, among others, work for a public agency on that agency’s own written contract and services an architect provides to a licensed engineer or land surveyor. Section 6749(b) excludes engineering services provided to an architect, a contractor or a public agency, and to a client with a current or prior engineering contract who has paid all the fees due under it. An engineering firm working as a sub-consultant to architects may therefore sit outside 6749 on those projects; whether it does on a given project is a question for its attorney.

The California Architects Board’s own page on the requirement lists “procedures for additional services” among the minimum contents. A procedure written into the contract helps only if the office follows it, and that is the part a records count can test.

Federal A-E work: no extra-fee service without written authorization

On a fixed-price federal contract for architect-engineer or other professional services, FAR 52.243-1, Changes — Fixed-Price, is used with Alternate III. The alternate lets the contracting officer, by written order, make changes within the general scope of the contract in the services to be performed, and adds paragraph (f): “No services for which an additional cost or fee will be charged by the Contractor shall be furnished without the prior written authorization of the Contracting Officer.”

Two operating lessons follow from the text. Authorization comes from the contracting officer, in writing, before the work; a request from a project reviewer in a design meeting is not the same document. And the basic clause’s paragraph (c) gives the contractor 30 days from receipt of a written change order to assert its right to an adjustment, though the contracting officer may act on a proposal submitted before final payment if the facts justify it. A firm working as a subcontractor to a prime gets its rights from its subcontract, which may flow these clauses down or set its own notice periods.

A caution on dates: the FAR is being rewritten under the Revolutionary FAR Overhaul, and acquisition.gov lists the overhauled parts and agency deviations. The text quoted here is the clause as published on acquisition.gov on October 17, 2026 (FAC 2026-01, effective March 13, 2026). The version that binds a firm is the one in its contract, and its attorney can say which applies.

Why the amendment does not get written

Nobody in the firm decides to work for free. The request arrives somewhere the amendment process is not looking, and the work starts before anyone connects the two. The usual entry points are easy to list:

  • A design meeting, where the client asks to see another option and the project architect says yes because the meeting is going well.
  • An email to the project manager — “can you also look at…” — that never reaches the principal who signs agreements.
  • A consultant’s question that turns into a redesign of the structural grid or the mechanical layout to match the new option.
  • A timesheet that offers only the contract phases, so new work is coded to Schematic Design or Design Development and blends into the original fee.
  • An awkward ask: the client is pleasant, the change seems small, and writing a price for it feels like an argument nobody wants.

Each of these is a gap in the process, not in anyone’s character. The fix is a place for the request to land and a person whose job is to price it.

Count it: hours coded after the scope was fixed, last ten projects

Before writing a new procedure, find out how large the problem is. The count needs no new software — only the agreements, the amendment or additional-service-request log, time entries and invoices for the last ten projects, closed or active.

  • For each project, write down the scope date: the day the agreement, or the last signed amendment, fixed the services and the fee.
  • List every client-directed change after that date, from meeting minutes, emails and revised drawing sets: another option, a changed program, a new consultant, a budget change.
  • Next to each change, record whether an amendment or additional-services request was written, the date it went out, the date the client authorized it, and the amount.
  • Pull the hours coded to the project in the weeks after each change, by phase, and compare each phase’s hours with the fee the agreement assigned to it.
  • Mark each unbilled change as one of three things: the firm’s own error (no charge, correctly), a recorded decision not to bill, or nothing — work that happened with no decision at all.

Illustrative example: across ten projects, four had a client-directed change after the scope date. One became an amendment. One was the firm’s own coordination error. Two produced about 120 hours with no request and no decision. At a hypothetical $150 an hour, that is $18,000 of work on the original fee. Replace every number with the firm’s own; if the records cannot produce a scope date or a change list for a project, that gap is the first finding.

The recorded decision not to bill

Giving a good client a small extra can be the right call. The leak is not the gift; it is the gift nobody decided on. One row in an additional-services log fixes that: the date, what was asked, who asked, an estimate of hours, the decision — bill it, waive it, or our error — and the name of the person who decided. A waived item still gets a line on the next invoice at no charge, so the client sees what was given.

The same log becomes the request itself when the decision is to bill. Keep the request to one page: the description, the cause in the agreement’s own terms (owner change, late information, code change), the fee or the hourly method, the schedule effect, and a line for the client’s written authorization. Proposals can carry the other half of the fix by naming what the fee covers — for example, how many schematic options are included before a second is priced — so the conversation in the meeting can be “that’s a priced option” instead of a silence.

On federal work, the log row is the contracting officer’s written authorization or nothing. In California, it is the procedure the contract already promised to follow.

How do I stop scope creep in a fixed-fee engineering proposal?

Write the limits into the proposal before it is signed: what the fixed fee includes, in counts; what it excludes, by name; what it assumes the client will supply; and how anything outside those lines gets priced. A request can be priced as extra only against a scope that says what was included.

In California, section 6749, covered above, already requires an engineer’s written contract to describe the services and the additional-services procedure, so these lines do double duty. Where 6749 does not apply, as on work for an architect, a contractor or a public agency, the firm’s own proposal and subconsultant agreement carry the whole job.

On a job for an architect, match the exclusions to the architect’s agreement with the owner. For example, if that agreement includes three schematic options and the engineering proposal prices one, the other two arrive at the engineer as unpriced requests. The clause wording is the firm’s attorney’s. Not legal advice. Five lines to put in the proposal:

  • Counts, not adjectives: the number of design alternatives, review submittals, plan-check response rounds, meetings and site visits the fee includes. “Coordination as required” has no number to hold the line.
  • Named exclusions: work the client may expect that the fee does not cover — for example, topographic survey, geotechnical investigation, permit and agency fees, redesign after a phase is approved, and construction-phase visits beyond the listed number.
  • Assumptions the price rests on: the information the client supplies, such as existing drawings, survey or a geotechnical report, and the date it is due. If it arrives late or differs from what was assumed, the fee reopens through the change route.
  • The change route, priced in advance: the hourly rates or unit prices extra work will be billed at, and the rule that it starts only after the client’s written authorization. With the rates already in the signed proposal, pricing a change is arithmetic, not a negotiation.
  • A time box: the fee holds through a stated date or phase; work stretched past it by client delays is priced through the same change route.

When not to hire anyone for this

If the count across ten projects turns up one or two unbilled changes, nobody needs a consultant. Add the log, add a time code for client-directed changes, name the person who prices them, and recount in a quarter. A firm where one principal runs every meeting and writes every agreement may already have the system in one head; the log simply writes it down.

Call the firm’s attorney rather than a consultant when there is a live dispute — a client refusing to pay for work done on an email request, an agreement with no additional-services clause at all, or a federal change where the 30-day window may have passed. We give no legal advice and read no agreement for its legal effect.

If additional services are one of several places fee slips between the signed agreement and the cleared payment — next to phases waiting on a milestone to bill, consultant invoices passed through a month late and receivables that age — that is where an architecture & engineering business consultant earns a fee, and it is what the Revenue Review counts. It is $4,500 fixed, $2,250 to begin and the balance when the report arrives, two weeks, with read-only access to agreements, amendments, time entries, invoices and the aging; drawings and models stay where they are. It ends in a written report with a monthly dollar figure wherever the records support one, a ranked list of fixes and a 90-day plan. We are not architects or engineers, and there is no published A/E client case study on this site yet. The free self-check comes first, then a 20-minute call that says plainly when the arithmetic does not justify the fee.

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Start with the Review.
If the causes are debatable, the problem crosses departments or systems, or the economics are unclear — diagnose before anyone builds. The Revenue Review: $4,500 fixed, two weeks, computed from your own records. Read a sample finding before you decide — free, no email.

Asked right after

What are additional services in architecture?
They are services beyond what the agreement’s fee covers that arise after it is signed. In AIA B101–2017, Section 4.2 calls them Additional Services and, except where the architect is at fault, entitles the architect to compensation and a schedule adjustment. The services listed in Section 4.2.1 need the owner’s written authorization before the work starts.
What is the difference between supplemental and additional services in B101?
Timing. Supplemental Services (Section 4.1.1) are listed in the agreement and chosen when it is signed — “Multiple preliminary designs” is one of them. Additional Services (Section 4.2) arise after signing, such as owner changes, late owner decisions or new code requirements.
Does an architect need written authorization before doing additional services?
Under the standard B101–2017, the services listed in Section 4.2.1 require the owner’s written authorization before the architect proceeds. On federal fixed-price A-E contracts, FAR 52.243-1 Alternate III says no extra-fee service is furnished without the contracting officer’s prior written authorization. The firm’s own agreement governs; ask its attorney about a specific project.
Does California require architects and engineers to use written contracts?
Yes, with exemptions. Business and Professions Code 5536.22 (architects) and 6749 (engineers) require a written contract before work begins, unless the client states in writing that work may start first, and both require the contract to describe the procedure for additional services. Each section lists cases where it does not apply.
Can a firm bill for additional services after the work is done?
Whether a client owes for work done without a written request is a question for the firm’s attorney, and the answer depends on the agreement and the facts. Operationally, the firm’s position is strongest with a dated log entry, the client’s request in writing and the hours coded to the change.
Do I need a written contract for every project?
In California, yes by default for paid architecture and engineering work, but both statutes exempt some repeat-client projects. Business and Professions Code 5536.22(b)(2) exempts an arrangement implied because the architect’s services are “of the same general kind which the architect has previously rendered to and received payment from the same client,” and 6749(b)(2) exempts an engineer with a current or prior contract with a client who has paid all the fees due under it. Even where no statute requires one, a short signed scope for each project is where the fee, the exclusions and the additional-services procedure get written down; outside California, the rule comes from that state’s law and the firm’s own agreements, so ask the firm’s attorney. Not legal advice.

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