The real problem: everyone reads the percentage differently
You get a transmittal that says "90% CDs" and you still don't know what you're holding. Is the set ready for the owner's rep to mark up? Can the cost estimator price it? Is the mechanical contractor going to find ducts routed through beams? The percentage on a CD submission is not a measure of how many sheets exist — it's a contract about completeness and coordination that two firms have to agree on, and the friction is that nobody wrote that contract down. A PM who treats 90% as "basically done" and an owner's rep who treats it as "final QC pending" are looking at the same stack of paper and budgeting completely different amounts of review time. The percentages only stop costing you billable hours once your team and your consultants share one definition of what each milestone is supposed to deliver — and what it is explicitly allowed to still be missing.
- The number describes the *state of the documents*, not effort spent or sheets issued.
- It is a coordination checkpoint, not a celebration — its main job is to surface gaps early enough to fix them cheaply.
- Confusion almost always comes from skipping the up-front agreement on what each milestone owes.
Where the percentages come from: there is no single standard
First, the honest caveat: CD milestone percentages are an industry convention, not a code-defined or AIA-defined deadline. The AIA defines the *phases* — Schematic Design, Design Development, and Construction Documents — but it does not legislate that CDs must be submitted at 50% and 90%. The percentages are how owners, lenders, and construction managers carve the CD phase into reviewable chunks. You'll see several common cadences, and which one you're on is set by your owner's agreement or CM contract, not by any universal rule.
- 30-60-90: common on public and institutional work, where 30% is essentially advanced DD, 60% is the heavy coordination pass, and 90% is near-final.
- 50-90-100: a leaner private-sector cadence — one substantial mid-point, one near-final QC set, one final.
- 50-75-95-100 / IFC: used on larger or fast-tracked projects that want an extra checkpoint before the final issue.
- Design-assist / CM-at-risk jobs often add pricing sets (e.g., a 50% set for a GMP estimate) on top of the design milestones.
What 50% actually represents
At 50% CDs, the building is decided but the documentation is openly incomplete. Plans, sections, and major elevations are drawn and the design intent is locked — you should not be relitigating layout or massing at 50%. But the set is deliberately *uncoordinated and under-specified*: details are partial, schedules are roughed in with holes, specifications may be an outline rather than full sections, and clashes between disciplines have not yet been resolved. A 50% set is for a reviewer to confirm direction and for an estimator to price scope with assumptions — it is not something anyone should try to build from. Reviewing a 50% set means checking that the right things are *present and headed the right way*, not red-lining every missing dimension. Marking up absences that everyone already knows are absent at 50% just burns the design team's time.
- Expect: floor plans, RCPs, building sections, primary elevations, a sheet index, key details started.
- Expect to be missing: full detailing, finalized schedules, coordinated MEP routing, complete specs.
- Reviewer's job: confirm design intent, code approach, and scope — flag direction problems, not gaps.
What 90% (and 100%) actually represent
A 90% set is nearly issue-ready. Disciplines have been coordinated — architectural, structural, and MEP should be talking to each other on the same sheets, with major clashes resolved or flagged. Details are largely complete, schedules are populated, and the specification is substantially written. What remains at 90% is final quality control: catching the last dimension strings that don't close, the door in the schedule that isn't on the plan, the keynote pointing at the wrong detail, and incorporating the owner's and consultants' final comments. This is the review where a meticulous owner's rep or QA/QC lead earns their fee, because it's the last realistic chance to catch errors before they become RFIs and change orders in the field. **100% CD** means the design team considers the set complete and internally coordinated — every comment resolved, the package self-consistent. It is the finish line for the *design* effort.
- 90%: coordinated, detailed, specified — final QC and last-comment incorporation only.
- 100%: complete and internally coordinated; the design team's deliverable is done.
- The jump from 90% to 100% is QC and cleanup, not new design work — if it isn't, your 90% wasn't really 90%.
100% CD is not the same as Issued for Construction
This is the distinction that trips up junior staff and even some PMs. **100% CD** is a statement about the documents' completeness. **Issued for Construction (IFC)** and **Issued for Permit (IFP)** are statements about *authorization* — what the set is officially released to do. A 100% CD set can still need permit-review corrections from the Authority Having Jurisdiction before it becomes IFP, and it may absorb owner-directed changes, value-engineering, or addenda before it's stamped IFC and handed to the builder. In practice the same drawings can carry a 100% CD title block on one issue and an IFC title block on a later one, after permit comments and final coordination land. The practical rule: 100% answers "is the set finished?"; IFC/IFP answers "is the set released, and for what?" Keep them as separate fields on your issue log so a downstream contractor never builds off a set that was complete but not yet authorized.
- 100% CD = documents complete and coordinated (a completeness state).
- IFP = released for the AHJ's permit review (an authorization).
- IFC = released to the contractor to build from (an authorization), usually after permit comments and final addenda.
- Track milestone (%) and issue status (CD / IFP / IFC) as two separate columns on every submission.
| Milestone | Drawings | Coordination | Specifications | What reviewers check | Build from it? |
|---|---|---|---|---|---|
| 50% CD | Plans, sections, primary elevations, key details started; schedules roughed in | Largely uncoordinated; clashes not yet resolved | Outline or partial sections | Design intent, code approach, scope completeness — not missing dimensions | No — pricing/direction only |
| 90% CD | Details largely complete; schedules populated; keynotes in | Disciplines coordinated; major clashes resolved or flagged | Substantially complete | Final QC: closure errors, schedule-to-plan mismatches, last owner/consultant comments | Almost — final QC pending |
| 100% CD | Complete and self-consistent across the set | Fully coordinated; comments resolved | Complete | That every comment is incorporated and the set is internally consistent | Design complete — but check issue status |
| IFC / IFP | Same set, released under permit/construction authorization | Final, post-permit-comment | Final, with addenda | Authorization and version control — is this the released set? | Yes — this is the authorized set |
Frequently asked
Is there an official standard that says CDs must be submitted at 50% and 90%?
No. The AIA defines the Construction Documents phase, but the percentage milestones are an industry convention set by your owner agreement or CM/GC contract, not by code or by the AIA. Cadences vary — 30-60-90, 50-90-100, and 50-75-95-100/IFC are all common. Always confirm which cadence and which definitions govern your specific project before the first submission.
Can a contractor build from a 90% set?
They shouldn't. A 90% set is coordinated and nearly complete but is still subject to final QC and last comments, and it has not been authorized for construction. Building from a 90% set means building from drawings that may still change, which generates avoidable RFIs and change orders. Wait for the Issued for Construction (IFC) set.
What's the difference between 100% CD and Issued for Construction?
100% CD describes completeness — the documents are finished and internally coordinated. Issued for Construction (IFC) describes authorization — the set is officially released for the builder to construct from. A 100% CD set often still goes through permit review (becoming Issued for Permit) and may absorb addenda before it is stamped IFC. Track the milestone percentage and the issue status as separate fields.
What should I actually mark up when I review a 50% set?
Confirm design intent, code strategy, and scope completeness — make sure the right rooms, systems, and assemblies are present and headed the right direction. Don't red-line missing dimensions, incomplete details, or unresolved clashes that everyone already expects to be absent at 50%; that just burns the design team's time. Save the line-by-line QC for the 90% review.
Who decides which milestone percentages a project uses?
The owner's agreement or the construction manager's contract. Public and institutional projects often mandate 30-60-90; private and design-assist projects frequently use 50-90-100 or add pricing sets. As the PM or owner's rep, pin down the cadence and the per-milestone definitions at the start so every consultant submits to the same standard.