In construction, “CD” is shorthand for construction documents, the final design-phase package of drawings and written specifications that tells a contractor exactly how to build a project. The CD set is both a technical instruction manual for every trade on site and a legal component of the contract between the owner and the builder. It is the most detailed, most expensive, and most consequential deliverable the design team produces, typically accounting for 35 to 50 percent of the architect’s total fee.
What a CD Set Actually Contains
A complete construction document package has two halves, and both are needed. Skip either one and the contractor is guessing.
The first half is the drawings. A typical set includes architectural plans showing room layouts, dimensions, and finishes; structural sheets detailing foundations, beams, and load-bearing connections; and MEP sheets covering mechanical, electrical, and plumbing systems. Larger or more complex projects also include civil site plans, landscape drawings, and fire protection sheets. Each discipline’s drawings are produced by specialists in that field, which is why coordination between them matters so much.
The second half is the project manual, which holds the written specifications. It uses the CSI MasterFormat system to organize material and performance requirements into standardized divisions numbered 00 through 49. Division 01 covers administrative and procedural requirements like submittals, quality control, and project closeout. Division 03 covers concrete, Division 09 covers finishes, and so on through all 50 divisions.1Construction Specifications Institute. MasterFormat Specifications tell the contractor not just what material to install, but the acceptable grade, the installation method, and the testing required to verify the work was done correctly.
When Drawings and Specifications Disagree
Conflicts between the drawings and the specifications surface on nearly every project. A wall section on the architectural sheet might call for one insulation type while the specification book names a different product. The contract’s “order of precedence” clause decides which document wins. Many construction contracts specify that the written specifications govern over the drawings when the two conflict.2Construction Specifications Institute. Interpretations and Clarifications Part 3 – Order of Precedence Clauses
AIA and EJCDC standard form contracts take a different approach. Rather than ranking one document type above another, they treat the entire set as “complementary,” meaning everything in the drawings and specifications carries equal weight. When a conflict surfaces, the architect or engineer determines which interpretation prevails.2Construction Specifications Institute. Interpretations and Clarifications Part 3 – Order of Precedence Clauses Read this clause carefully before signing, because it directly affects who pays when an ambiguity leads to rework.
Where CDs Fit in the Design Process
The American Institute of Architects organizes a building project into five sequential phases: Schematic Design, Design Development, Construction Documents, Bidding and Negotiation, and Construction Administration. CDs come third. By then, the big-picture decisions about size, shape, layout, structural systems, and overall look are already locked in. The CD phase is where the team shifts from “what are we building?” to “exactly how does it get built?”
Approximate layouts become exact dimensions. General material ideas become specific product selections with manufacturer names and model numbers. The architect, structural engineer, and MEP consultants all produce coordinated sheets that together form a single instructional package. Once the package is complete, the project moves into bidding, where contractors price the work, and then into construction, where the design team monitors the build against those same documents.
What Has to Be Decided Before CDs Can Be Drafted
Architects can’t start producing construction documents until certain upstream decisions are final. Changing a material selection or structural system after the CD phase has begun triggers expensive rework across multiple disciplines. The following inputs need to be locked down first:
- Site survey data: topography, property boundaries, utility locations, and soil conditions all shape how the building sits on its site. A survey error that surfaces after CDs are issued can force a full foundation redesign.
- Structural engineering calculations: engineers calculate wind loads, seismic resistance, and gravity loads based on the International Building Code, then translate those into specific beam sizes, connection details, and foundation depths on the structural sheets.3International Code Council. Chapter 2 Code Requirements for Wind and Seismic Forces
- Final material selections: insulation R-values, fire-rated assemblies, window performance ratings, and similar specifications must be confirmed before they appear in the project manual. Specifying a product that turns out to be backordered or discontinued delays the whole project.
- Energy code compliance: current energy codes require documentation showing that the building envelope, HVAC systems, and lighting meet minimum efficiency thresholds. The 2021 International Energy Conservation Code, for example, requires functional testing and commissioning documentation for commercial buildings.4International Code Council. IECC Compliance
Discrepancies between disciplines at this stage lead to permit denials, or worse, buildings that don’t meet code.
Seals, Signatures, and the Permit Submission
Construction documents submitted for permits must bear the professional seal and signature of a licensed architect or professional engineer. Each sheet is sealed by the professional responsible for the work shown on it, so the structural engineer seals the structural drawings, the electrical engineer seals the electrical drawings, and so on.5Indian Health Service. Chapter 24 – Final Document Stamp/Seal Requirements The seal carries legal weight. It certifies that the professional has reviewed the work, that it meets applicable codes, and that they are personally accountable for the design.
Most states exempt certain small residential projects from the seal requirement, though the threshold varies. A single-family home under a certain square footage might not need an architect’s stamp, while any commercial or multi-family building almost always does. Check with the local building department before assuming an exemption applies.
Once the set is sealed, the owner or architect submits it to the local building department for plan review. Most jurisdictions now accept digital submissions through online portals, though some still require physical sets. Reviewers check the documents against local building codes, zoning requirements, and fire safety regulations. Review typically takes several weeks; complex commercial projects take longer.
Permit fees vary widely. Many building departments calculate the base fee as a percentage of the project’s total construction value, commonly in the range of 1 to 3 percent, with a plan review surcharge on top. A modest residential project might run a few hundred to a few thousand dollars. Large commercial buildings can run well into five figures.
How CDs Are Used During Bidding and Construction
Once permits are moving, the CD set is distributed to prospective contractors through a process called tendering. Contractors use the drawings and specifications to calculate their material quantities, labor hours, and subcontractor costs, then submit a formal bid. Because every bidder works from the same documents, the process depends on those documents being complete and unambiguous. Gaps in the CDs produce wildly different bid prices, which defeats the point of competitive bidding.
Questions always come up during the bidding period. When a contractor spots a conflict or needs clarification, the architect issues an addendum that modifies or supplements the original documents. Addenda become part of the construction contract and carry the same legal weight as the original CDs. Every addendum must go to all bidders so no one has an information advantage.6eCFR. 23 CFR 635.112 – Advertising for Bids and Proposals On federally funded projects, major changes to the plans or specifications during advertising require approval from the relevant federal division administrator before the addendum can be issued.
Once construction starts, the CD set remains the reference for almost every decision on site. When a contractor finds something unclear or hits a condition that doesn’t match the drawings, they submit a Request for Information. An RFI is a formal written process where the contractor asks the architect or engineer to clarify a gap, conflict, or missing detail. The design team responds in writing, sometimes with revised drawings or supplemental sketches.
Submittals are the other major touchpoint. Before installing key materials, the contractor sends product data, shop drawings, or samples to the architect for review. The architect checks whether the proposed product matches what the specifications require. A spec might call for a particular fire rating or acoustic performance, and the submittal process is where the architect verifies the contractor’s proposed product actually meets that bar. Rejected submittals send the contractor back to find a compliant product, which is why getting material selections right during the CD phase saves everyone time later.
Liability and Ownership
Construction documents carry real legal consequences for everyone involved. Three principles shape who bears the risk when something goes wrong.
The Spearin Doctrine
When an owner hands a contractor a CD set and says “build this,” the owner is implicitly promising that those documents are adequate for the job. The principle comes from a 1918 Supreme Court case, United States v. Spearin, and it still governs construction liability today. Under the Spearin Doctrine, a contractor who builds according to the owner’s plans and specifications cannot be held responsible for defects caused by errors in those documents.7EJCDC. Spearin and the Standard of Care The doctrine applies most directly to traditional design-bid-build delivery, where the owner provides CDs and the contractor prices them. In design-build projects, where the contractor also controls the design, the risk allocation shifts.
The Architect’s Standard of Care
No CD set is perfect, and the architectural profession doesn’t promise error-free work. The standard form agreement between owner and architect requires the architect to perform services “consistent with the professional skill and care ordinarily provided by architects practicing in the same or similar locality under the same or similar circumstances.”8American Institute of Architects. Standard of Care – Confronting Errors and Omissions Up Front That language is deliberately flexible. An architect isn’t liable for every error in the CDs, but when a design decision is proven unreasonable, or when the cost of correcting errors becomes disproportionate to the construction cost, liability attaches. Violating a building code, committing fraud, or exceeding the scope of the architect’s authority can also trigger liability.
Who Owns the Documents
Paying for construction documents does not mean you own them. Under AIA standard form contracts, the architect and the architect’s consultants retain all ownership rights, including copyright, in the documents they produce. The owner receives a license to use those documents solely for constructing, maintaining, altering, and adding to the specific project they were created for.9AIA Contract Documents. The Rights of an Architects Instruments of Service That license typically does not extend to using the same drawings for a second, identical building on another site. Owners who want broader reuse rights need to negotiate them into the contract before design work begins, not after the CDs are finished.