Design Phase Milestones, Deliverables, and Phase Gate Reviews

The standard design phases (SD, DD, CD), their expected deliverables, completion criteria, and the gate review processes that control phase transitions and authorize advancement of a project through design.

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Overview

Every architectural project moves through defined design phases, each with specific deliverables and a review gate at the end. These phases aren't arbitrary. They represent a deliberate progression from broad concepts to precise construction instructions, with structured checkpoints that let the owner, design team, and stakeholders confirm the project is on track before committing more resources.

The traditional sequence runs through five phases: Schematic Design, Design Development, Construction Documents, Bidding/Negotiation, and Construction Administration. For the PjM exam, you need to know what gets produced at each phase, what gets reviewed, and what criteria must be met before advancing to the next phase.

Phase gate reviews serve as quality control checkpoints. They verify that design decisions align with the project's program requirements, budget constraints, and code compliance obligations. Skipping or rushing through a phase gate creates downstream risk: errors not caught in design development become expensive change orders during construction.

The fee distribution across phases reflects the effort profile. Schematic design might represent 15-18% of the total fee. Design development accounts for roughly 20%. Construction documents, where the bulk of the technical documentation gets produced, commands the largest share at approximately 31-40%. Understanding this distribution helps project managers plan staffing and workload across the project timeline.

Essential

Architectural projects don't progress on a smooth continuum. They advance through distinct phases, each with its own purpose, deliverables, and exit criteria. Getting the phase structure right matters because it drives scheduling, staffing, budgeting, and client communication. ## The Design Phase Sequence The traditional architectural services model follows five phases, as described in AIA B101: 1. Schematic Design (SD) 2. Design Development (DD) 3. Construction Documents (CD) 4. Bidding and Negotiation 5. Construction Administration (CA) For scheduling purposes, the first three phases (SD, DD, CD) are the design phases where the architect produces the documents that define the project. Each phase builds on the previous one, progressively refining the design from conceptual to constructible. Some delivery methods modify this sequence. Integrated Project Delivery (IPD) redefines the phases as Conceptualization, Criteria Design, Detailed Design, Implementation Documents, Agency Review, Buyout, Construction, and Closeout.

Professional

Consider a 40,000 SF community center designed by a mid-size firm under a design-bid-build contract with a public agency. The project has a $12 million construction budget, a 14-month design schedule, and formal review gates at each phase transition. Here's how the milestone and gate review process plays out in practice. ## Schematic Design Gate The SD phase lasts about 10 weeks. The architect produces three preliminary design alternatives, presents them at two community meetings, and refines the selected scheme based on stakeholder feedback. At the SD gate review, the agency evaluates whether the selected scheme meets the programmatic requirements, whether the preliminary cost estimate is within budget, and whether the design direction has community support. What makes this gate review valuable isn't the approval itself. It's the discipline of having a defined checkpoint where scope questions get resolved. Without a formal SD gate, scope creep starts early and accelerates.

TLDR

SD (18% of fee): Establishes scope, scale, spatial relationships. Deliverables: site plan, floor plans, sections, elevations, preliminary cost estimate. Conceptual in character.
DD (20% of fee): Fixes size and character of the project. Building areas/volumes locked. Structural, MEP systems laid out. Consultant coordination in full swing.
CD (31% of fee): Complete construction documents for permitting and bidding. Largest phase by effort and staffing. Everything gets finalized.
Review milestones: 30% (major systems established), 60% (constructability review, major features frozen), 90% (near-complete, cost estimate tight), 100% (final documents, all comments addressed)
Phase gates are formal go/no-go decisions authorizing investment in the next phase; the DD gate is the last practical opportunity for major design changes
Value engineering should happen at or before 30% CD / end of preliminary engineering; VE after 90% CDs rarely saves enough to justify the rework
Post-bidding VE is limited (one agency caps it at revisions corresponding to 10% of pre-bid construction budget)
IPD phases differ from traditional: Conceptualization, Criteria Design, Detailed Design, Implementation Documents, Agency Review, Buyout, Construction, Closeout
Staffing ramp follows the fee curve: plan team additions before each phase transition, not after

ELI5

Think about writing a big school report. You don't start by writing the final version. You go through steps. First, you pick your topic and make an outline. That's like Schematic Design. You're figuring out what the report is about and how it's organized. You show your teacher the outline, and they say "looks good, keep going" or "change this part." That's the phase gate review. Next, you write a rough draft. You fill in the sections, add your arguments, include your sources. That's Design Development. The rough draft isn't perfect, but it shows what the final report will look like. Your teacher reviews it again: "The structure is solid, but expand section 3 and check your sources in section 5." Another checkpoint. Finally, you write the final version. Every sentence is polished, every citation is formatted, every page number is correct. That's Construction Documents.

AREProject Management

Design Phase Milestones, Deliverables, and Phase Gate Reviews

2 min read205 words

The Rhythm of Design: Phases, Gates, and Deliverables

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