FAR 36.601-4—Implementation.
Plain-English Summary
FAR 36.601-4 explains how contracting officers should identify what counts as architect-engineer (A-E) services for purposes of the special procurement procedures in this subpart. It covers four major subject areas: professional architectural or engineering services required by state law to be performed or approved by a registered architect or engineer; professional A-E services tied to the design or construction of real property; other related professional services that logically require registered architects or engineers, including studies, investigations, surveying and mapping, tests, evaluations, consultations, comprehensive planning, program management, conceptual designs, plans and specifications, value engineering, construction phase services, soils engineering, drawing reviews, and preparation of operating and maintenance manuals; and the treatment of surveying and mapping services, including when mapping must be acquired under A-E procedures versus when it should be acquired under the general competition procedures in FAR parts 13, 14, or 15. The section also states that contracting officers may award A-E contracts to any firm legally permitted to practice architecture or engineering. In practice, this provision is a classification rule: it helps the contracting officer decide whether a requirement belongs in the Brooks Act/A-E procurement framework or in ordinary acquisition channels. That decision matters because A-E services are procured differently from most other services, and misclassification can lead to using the wrong source selection method, the wrong competition procedures, or the wrong pool of eligible firms.
Key Rules
State-Licensed A-E Services
Services that state law defines as architectural or engineering work and requires to be performed or approved by a registered architect or engineer should be treated as architect-engineer services. The key test is whether applicable state licensing law places the work within the professional practice of architecture or engineering.
Design-Construction Related Services
Professional services associated with the design or construction of real property are A-E services when they are part of the architectural or engineering function. This includes work that supports planning, design, or construction of buildings, facilities, or other real property improvements.
Incidental Professional Services
Other professional services may also be A-E services if they are incidental to architecture or engineering and logically require performance by registered architects or engineers or their employees. The rule expressly includes studies, investigations, surveying and mapping, tests, evaluations, consultations, comprehensive planning, program management, conceptual designs, plans and specifications, value engineering, construction phase services, soils engineering, drawing reviews, and preparation of operating and maintenance manuals.
Surveying Is A-E Work
Professional surveying services are treated as architect-engineer services and must be procured under section 36.601 from registered surveyors or architects and engineers. The section makes surveying a covered A-E service rather than a general professional service.
Mapping Depends on Context
Mapping connected to research, planning, development, design, construction, or alteration of real property is an A-E service and must be procured under section 36.601. Mapping that is not connected to traditionally understood A-E activities, is not incidental to them, or is not traditionally considered A-E work must be acquired under FAR parts 13, 14, or 15 instead.
Eligible Firms
Contracting officers may award A-E contracts to any firm that is legally permitted by law to practice architecture or engineering. This means eligibility turns on legal authority to practice, not on a special federal certification list in this section.
Responsibilities
Contracting Officer
Determine whether the requirement falls within the A-E category by applying the state-law, design/construction, incidental-services, surveying, and mapping tests. Use the A-E procurement procedures when the work qualifies, and use FAR parts 13, 14, or 15 for mapping that is outside the A-E scope.
Contracting Officer
Ensure the selected firm is legally permitted to practice architecture or engineering under applicable law before award. The contracting officer must also recognize that surveying and qualifying mapping are not ordinary commercial services for procurement-method purposes.
Contractor / A-E Firm
Hold the legal authority required to practice architecture or engineering, and for surveying or mapping work, be able to show that the firm is properly qualified or licensed as applicable. The firm should understand that its services may be procured under specialized A-E procedures rather than standard service contracting methods.
Agency
Structure requirements and acquisition planning so that A-E work is identified early and routed to the correct procurement process. Agencies should avoid packaging or describing work in a way that obscures whether the requirement is truly A-E in nature.
Practical Implications
This section is mainly a classification tool, but the classification drives the entire acquisition path. If the work is A-E, the contracting officer must use the special procedures in this subpart rather than treating it like a normal service buy.
Surveying is always treated as A-E work under this section, while mapping requires a closer look at its connection to real property and traditional A-E activities. A common mistake is assuming all mapping is automatically A-E or, conversely, assuming it is always a general service.
The phrase "logically or justifiably require performance by registered architects or engineers" is important because it broadens A-E coverage beyond pure design work. Services like studies, value engineering, construction phase support, and operating manual preparation may still fall under A-E procedures if they are tied to professional architectural or engineering judgment.
For mapping, the acquisition method changes depending on context. If the mapping is not tied to real property design, construction, or alteration, the contracting officer should use the normal competition rules in FAR parts 13, 14, or 15 instead of A-E procedures.
Eligibility is tied to legal authority to practice, so contracting officers should verify state licensing or other applicable legal authorization early. Failing to do so can create award risk, especially where state law controls who may perform or approve the work.
Official Regulatory Text
(a) Contracting officers should consider the following services to be "architect-engineer services" subject to the procedures of this subpart: (1) Professional services of an architectural or engineering nature, as defined by applicable State law, which the State law requires to be performed or approved by a registered architect or engineer. (2) Professional services of an architectural or engineering nature associated with design or construction of real property. (3) Other professional services of an architectural or engineering nature or services incidental thereto (including studies, investigations, surveying and mapping, tests, evaluations, consultations, comprehensive planning, program management, conceptual designs, plans and specifications, value engineering, construction phase services, soils engineering, drawing reviews, preparation of operating and maintenance manuals and other related services) that logically or justifiably require performance by registered architects or engineers or their employees. (4) Professional surveying and mapping services of an architectural or engineering nature. Surveying is considered to be an architectural and engineering service and shall be procured pursuant to section 36.601 from registered surveyors or architects and engineers. Mapping associated with the research, planning, development, design, construction, or alteration of real property is considered to be an architectural and engineering service and is to be procured pursuant to section 36.601 . However, mapping services that are not connected to traditionally understood or accepted architectural and engineering activities, are not incidental to such architectural and engineering activities or have not in themselves traditionally been considered architectural and engineering services shall be procured pursuant to provisions in parts 13 , 14 , and 15 . (b) Contracting officers may award contracts for architect-engineer services to any firm permitted by law to practice the professions of architecture or engineering.