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Assigning design responsibility for a complex building system means defining, in the contract documents, which work the designer of record (DOR) completes and which work a specialty contractor or specialty design professional completes. Done correctly, delegated design preserves a single, reviewable performance strategy; done vaguely, it can leave structural loads, movement, seals, connections, or installation details “to be designed by others” with no party clearly accountable.
The practical answer is to define the delegated system and its boundaries, state the design criteria and assumptions, assign every interface, route and approve the specialty package before installation, and verify that the approved design is what gets fabricated and installed. Code procedures, licensing duties, and the legal effect of a review vary by project location and contract, so the adopted code and local building department must be checked.
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What is delegated design?
Delegated design is a defined portion of a project’s design completed by a contractor, subcontractor, manufacturer, or specialty design professional rather than entirely by the project’s prime design team. The contract documents establish the system’s performance requirements and design intent; the delegated designer then develops the engineering, fabrication information, connection details, and installation information needed to complete that portion of the work.
Common examples include curtain walls, precast concrete, trusses, roof systems, stairs, fire-protection systems, specialty glazing, and other assemblies whose final geometry or connection details depend on the selected manufacturer and construction means. The specialty designer may be a licensed professional, depending on the work and the jurisdiction.
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Delegation can give the project team access to specialist knowledge and constructible solutions, and it can allow a contractor to coordinate fabrication earlier. Those are potential benefits, not automatic results. If the documents do not define the limits of the delegation, the process can create duplicated work, gaps in responsibility, or incompatible assumptions.
“The contract documents should clearly state who is responsible, not only for each portion of the design, but also for the interfaces between elements to be designed by different parties.” — Demetria Boatwright and Kurt Hoigard, Building Enclosure, April 5, 2019
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Who is responsible for delegated design?
Responsibility is divided by the contract and governing law, not by the label “delegated design” alone. The DOR generally establishes the overall design concept and the criteria that the delegated system must satisfy. The specialty designer is responsible for the portion it develops, within the stated scope and applicable professional-practice rules. The contractor remains responsible for procuring and installing the work in accordance with the approved documents and the construction contract.
Those broad descriptions are not a substitute for project-specific language. Some jurisdictions require a licensed specialty professional to prepare, sign, or seal delegated documents; others require DOR review, a DOR seal, or both for particular systems. Contract terms can also allocate coordination, shop-drawing preparation, means and methods, and field verification differently. Check the project’s licensing board, adopted building code and amendments, building-department procedures, and prime and subcontracts before assigning duties.
A DOR’s review of a delegated submittal is normally a review against the stated design criteria and design concept—not a complete redesign of the specialty system. Nor does a review automatically release the specialty designer, contractor, or manufacturer from obligations assigned by the contract or law. The submittal, review notation, and contract should say what the review does and does not cover.
How do you assign delegated design correctly?
Use a written assignment that is specific enough for a specialty designer to complete the work and for the DOR to evaluate it. The following sequence works for curtain walls, precast, and other high-consequence building systems.
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1. Identify the system and draw its boundaries
Name the delegated system and list what is inside and outside its scope. For a curtain wall, that may include mullions, infill, anchors, fasteners, glass, pressure plates, gaskets, sealants, thermal breaks, and perimeter conditions. State whether adjacent flashings, embeds, fire safing, waterproofing, interior finishes, and structural supports are part of the delegation or are designed by others.
Include a responsibility matrix or annotated details. A scope sentence such as “exterior wall system by others” is too vague to resolve who designs a sill pan, backer rod, end dam, fire-containment interface, or transition to a roof membrane.
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2. State the performance criteria and assumptions
Provide the criteria the specialty designer must use, including applicable gravity and lateral loads, wind pressures, seismic movement, story drift, thermal movement, tolerances, deflection limits, water and air-control requirements, thermal performance, energy, fire, acoustical targets, durability, and service-life requirements where applicable.
Identify the governing structural assumptions: support locations, slab-edge conditions, anchor capacities, allowable reactions, dead-load paths, and any limits on transferring load to adjacent construction. For a curtain wall, clarify whether the primary structure carries only lateral reactions or also gravity loads from the wall. A mismatch between the prime designer’s assumptions and the specialty designer’s calculations can affect the structure, anchors, and façade.
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3. Assign every interface
Interfaces deserve their own assignment, not a footnote. Name the party responsible for each transition between the delegated system and the structure, roof, below-grade waterproofing, doors, windows, louvers, fire-resistance assemblies, interior air barrier, and exterior cladding.
Require interface details to show continuity of water, air, vapor, thermal, and fire-control layers. Boatwright and Hoigard describe a failure mode in which each adjacent designer assigns a seal or transition “to be designed by others.” The result is an incomplete enclosure even though each individual package appears finished.
4. Define the calculation, drawing, and sealing package
Specify the documents required from the specialty designer: calculations, design drawings, schedules, material and finish information, fabrication drawings, panelized layouts, connection details, installation instructions, field dimensions, allowable modifications, and maintenance information as appropriate. Require a coordinated package rather than separate drawings that do not share the same geometry or assumptions.
State who must sign or seal each document and identify the professional license required in the project jurisdiction. The package should show actual spans, anchors, connection constraints, fastener requirements, movement joints, tolerances, and any field adjustments that are permitted. Manufacturer literature alone is not a project-specific delegated design.
5. Set the routing and approval sequence
Establish one formal path for submittals: specialty designer or subcontractor, general contractor, DOR, and building department when required. The 2019 Building Enclosure article recommends that the specialty package reach the DOR and, as applicable, the building official for review before installation.
Define review durations, required responses, resubmittal procedures, and the point at which fabrication may begin. “Approved as noted” should identify which comments must be resolved before fabrication or installation. No field crew should rely on an informal email or an unapproved fabrication revision when the change affects load, movement, fire, air, or water performance.
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6. Coordinate before fabrication and mock-up
Bring the specialty designer, DOR, structural engineer, contractor, manufacturer, and relevant adjacent trades together while dimensions and interfaces can still change. Coordination should cover survey control, embeds, slab edges, tolerances, sequence, access, lifting, temporary support, sealant joints, fire containment, and the location of tests and inspections.
For complex enclosures, a project-specific mock-up can expose conflicts before production. If a standard assembly is customized, modified, or fabricated or installed differently from the tested configuration, evaluate whether the change affects the tested performance. A tested standard assembly does not automatically validate every project alteration.
7. Verify fabrication and field installation
Match the inspection effort to the system’s risk and the changes made to it. Useful controls include shop inspections, dimensional checks, unit and fastener inspections, anchor verification, field observation, and air- and water-performance testing. Third-party special inspections may be appropriate where required by code or where the consequences of a defect are high.
Keep a current record of approved revisions, field fixes, test reports, nonconformance resolutions, and as-built dimensions. The final record should show what was actually installed, not merely what was issued for bid.
What are deferred submittals, and when can work begin?
A deferred submittal is a design or documentation package submitted after the main construction documents, usually because the final information depends on a selected specialty contractor or manufacturer. Under the framework described in the 2019 article, the construction documents identify the deferred items for building-official approval, then the DOR and building department review the package before installation.
The article cites International Building Code Section 107.3.4.1 and reports that, among the building departments that responded to the authors’ inquiries, only about 40 percent required deferred submittals to be received and approved by both the DOR and building official before installation. That figure describes those respondents; it is not a representative national estimate and should not be treated as a current rule.
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Who reviews delegated design submittals?
The review team is determined by the contract and jurisdiction. The DOR typically checks whether the submittal conforms to the project’s design concept, performance criteria, dimensions, interfaces, and specified materials. The structural engineer, enclosure consultant, fire-protection designer, or other discipline specialist may review the portions within their expertise. The building department reviews for code compliance when its procedure requires that review.
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Review comments should be traceable to a criterion, drawing, calculation, or interface. A reviewer should not silently assume responsibility for means and methods, fabrication quality, or field installation. Conversely, a specialty designer should not treat a DOR review as permission to ignore unresolved comments or contract requirements.
What can go wrong when interfaces are not assigned?
Interface failures are often more damaging than an error confined to one component. The DOR may design the structure for one curtain-wall gravity-load assumption while the specialty designer designs the wall for another. A seal may be assigned to adjacent packages that each exclude it. A precast connection may fit the calculation but conflict with a slab edge, firestop, or waterproofing transition.
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The same paper warns that customization can change a tested assembly. Changes in mullion geometry, anchors, gaskets, sealants, panel joints, or installation sequence may alter air, water, structural, thermal, or fire performance. The project-specific delegated package should identify such modifications and establish how their effects will be evaluated.
Which project controls reduce delegated-design risk?
For complex building-enclosure systems, the IIBEC recommendations support controls that begin in conceptual design rather than at the first shop-drawing review:
- Early enclosure commissioning: involve commissioning personnel while performance requirements, details, and specifications can still change.
- Peer review: use an independent specialty-engineering or enclosure review for complex delegated designs.
- One coordinated, sealed package: combine calculations, fabrication drawings, panel layouts, connection information, and installation instructions.
- Explicit performance coordination: reconcile structural movement, wind, water, air, thermal, energy, fire, and sound requirements.
- Manufacturer review: require the manufacturer to review the project-specific delegated package, not merely issue generic literature.
- Pre-fabrication meetings: resolve dimensions, anchors, tolerances, field modifications, sequencing, and testing before production.
- Inspection and testing: use shop and field quality checks, unit and fastener inspections, dimensional verification, and field air/water testing where appropriate.
- As-built documentation: preserve approved changes, field fixes, test records, and supporting calculations.
These are recommendations described in the cited IIBEC paper, not universal code mandates. The contract, code, risk profile, and owner’s requirements determine which controls are required.
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How does delivery method affect delegated design?
Delivery method changes when the specialty contractor joins the team and who contracts with the specialty designer, but it does not remove the need to assign interfaces and criteria. In traditional design-bid-build, the specialty designer may enter after the main design is complete, increasing the importance of clear criteria and constructible details. Design-assist can bring the contractor and manufacturer into design earlier, allowing better coordination while the DOR retains defined design responsibilities. Integrated project delivery can create still earlier collaboration, but the agreement must specify professional obligations, review authority, and ownership of the final design.
Compare the options by asking: when does the specialty contractor participate; who retains the specialty designer; who owns component and interface design; how are assumptions recorded; what is the approval path; when can fabrication start; and who commissions, inspects, tests, and documents the installed system?
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What should the contract documents say?
A robust specification or delegated-design exhibit should identify:
- the exact delegated systems, exclusions, and adjacent work;
- required licenses, seals, calculations, drawings, and manufacturer approvals;
- design loads, movement, tolerances, performance targets, and structural assumptions;
- each interface owner, including transitions between air, water, vapor, thermal, and fire-control layers;
- submittal routing, review durations, resubmittals, and approval-before-installation rules;
- fabrication-release restrictions and procedures for substitutions or field changes;
- inspection, testing, mock-up, commissioning, and special-inspection requirements; and
- as-built, operation, maintenance, and warranty documentation.
Use a responsibility matrix that names organizations and disciplines, not just generic phrases such as “contractor” or “designer.” Have counsel and the project’s design professionals reconcile the matrix with the prime contract, subcontracts, insurance requirements, and local licensing rules.
Further reading and code reference
The deferred-submittal discussion in the source article references the 2018 International Building Code, including Section 107.3.4.1. That edition is a useful reference phrase when researching the cited framework, but it does not establish the code for every project. Confirm the edition and amendments adopted at the project location, then follow the local building department’s submittal and approval procedure.
For implementation guidance, see the IIBEC papers Strategies for Successfully Implementing Delegated Design and Delegated Design Dilemmas.
Frequently Asked Questions
Does delegated design change who signs the building permit drawings?
Not automatically. Signing and sealing duties depend on the adopted code, state or provincial licensing rules, permit procedures, and the contract; some jurisdictions require review or a seal by the DOR, the specialty professional, or both. Confirm the requirement with the project’s building department and licensing board before submission.
Can a specialty contractor delegate its delegated design to a manufacturer?
The contract can require a manufacturer or another licensed specialty professional to prepare the package, but the original contractor remains responsible for the obligations assigned to it. The documents should identify the actual design professional, scope, seal, review path, and coordination duties rather than treating a manufacturer’s catalog as the design.
What should be included in a delegated-design responsibility matrix?
List each component, interface, design criterion, document, review, inspection, test, and final record, with one named responsible party and any required reviewer. Include transitions at structure, roof, openings, fire barriers, and adjacent cladding so no seal, flashing, anchor, or movement joint is left under “by others.”
When should the building-enclosure commissioning agent be involved?
For a complex enclosure, involvement should begin during conceptual design, before performance requirements and interface details are fixed. Early participation lets commissioning address criteria, mock-ups, testing, and documentation instead of discovering conflicts only after fabrication or installation.
