1.2 The Schematic Design Phase & Multi-Discipline Workflow

ARE 5.0 Project Planning & Design PPD

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1 Chapter 1: Exam Overview & Schematic Design Process

1.1 ARE 5.0 PPD Format, Scoring & Case Study Navigation 1.2 The Schematic Design Phase & Multi-Discipline Workflow 1.3 Regulatory Framework: Navigating Codes, Standards & Jurisdictions

2 Chapter 2: Site Analysis, Topography & Soil Conditions

2.1 Site Topography, Grading, Slopes & Cut/Fill Calculations 2.2 Geotechnical Reports, Soil Classification & Foundation Selection 2.3 Site Hydrology, Drainage & Stormwater Management Neighborhood Context, Historic Settings & Site Integration

3 Chapter 3: Climate, Microclimate & Solar Design

3.1 Solar Geometry, Sun Angles & Sun Path Diagrams 3.2 Microclimate Analysis, Prevailing Winds & Passive Ventilation 3.3 Passive Solar Heating & Thermal Mass Strategies

4 Chapter 4: Sustainable Principles & Energy Standards

4.1 Daylighting Metrics: Spatial Daylight Autonomy (sDA) & Annual Sun Exposure (ASE) 4.2 Building Energy Standards: ASHRAE 90.1, IECC & Energy Use Intensity (EUI) 4.3 High-Performance Frameworks: LEED v4.1, Net Zero & Embodied Carbon

5 Chapter 5: Zoning Regulations & Land Use Controls

5.1 Zoning Envelopes: Setbacks, Floor Area Ratio (FAR) & Lot Coverage 5.2 Parking Requirements, Access & Site Circulation Planning 5.3 Environmental Regulations: Wetlands, Flood Zones & Brownfields

6 Chapter 6: Building Code Fundamentals: Occupancy & Construction Types

6.1 IBC Occupancy Classifications & Group Characteristics 6.2 Mixed Occupancy Strategies: Nonseparated, Separated & Accessory 6.3 IBC Construction Types I Through V & Fire-Resistance Ratings 6.4 Allowable Building Height & Area Calculations (IBC Tables 504 & 506)

7 Chapter 7: Means of Egress & Fire Protection

7.1 Occupant Load Determination & Egress Sizing (IBC Chapter 10) 7.2 Egress Components: Common Path, Travel Distance & Exit Separation 7.3 Passive Fire Protection: Fire Walls, Barriers & Smoke Partitions 7.4 Active Fire Suppression: Sprinklers, Standpipes & Fire Alarms

8 Chapter 8: Accessibility & Universal Design

8.1 Accessible Routes, Curb Ramps & Parking Layouts (ADA / ICC A117.1) 8.2 Interior Accessibility: Doors, Maneuvering Clearances & Corridors 8.3 Accessible Plumbing Facilities: Restrooms, Grab Bars & Fixture Layouts

9 Chapter 9: Structural Systems: Wood, Steel, Concrete & Masonry

9.1 Structural Selection & Spanning Rules of Thumb 9.2 Steel Framing Systems: Beams, Girders & Open-Web Joists 9.3 Concrete Framing Systems: One-Way, Two-Way & Post-Tensioned Slabs 9.4 Wood Systems: Light-Frame, Heavy Timber & Mass Timber (CLT)

10 Chapter 10: Lateral Force Resisting Systems & Foundations

10.1 Lateral Load Paths: Wind vs. Seismic Forces 10.2 Shear Walls, Braced Frames & Moment Frames 10.3 Shallow vs. Deep Foundation Systems: Footings, Mats, Piles & Caissons

11 Chapter 11: Building Envelope: Physics, Assemblies & Moisture Control

11.1 Envelope Thermal Performance: U-Values, R-Values & Thermal Bridging 11.2 Moisture Management: Vapor Retarders, Air Barriers & Water Resistive Barriers 11.3 High-Performance Wall & Roof Assemblies: Rainscreens & Inverted Roofs 11.4 Fenestration & Glazing: U-Factor, SHGC, Condensation Resistance & VT Interior Materials, Durability & Program Performance

12 Chapter 12: Mechanical & HVAC Systems

12.1 HVAC System Types: All-Air, Air-Water, All-Water & VRF Systems 12.2 Central Plant Equipment: Chillers, Boilers, Cooling Towers & Geothermal 12.3 Ductwork Distribution, Air Handling & Plenum Space Requirements 12.4 Indoor Air Quality, Ventilation Rates & ASHRAE 62.1 Baselines

13 Chapter 13: Plumbing, Electrical & Life Safety Systems

13.1 Domestic Water Supply & Pressure Boosting Systems 13.2 Sanitary Drainage, Venting & Fixture Count Calculations 13.3 Electrical Service, Transformers, Switchgear & Backup Generators 13.4 Lighting Design, Controls & Lighting Power Density (LPD) Limits

14 Chapter 14: Specialized Building Systems & Vertical Circulation

14.1 Architectural Acoustics: STC, NRC, RT60 & Noise Criteria (NC) 14.2 Elevator Systems: Traction vs. Hydraulic, Core Layout & Sizing 14.3 Building Telecommunications, Security & Building Automation Systems (BAS)

15 Chapter 15: Systems Integration & Coordination

15.1 Floor-to-Floor Height & Plenum Coordination (Structure + MEP + Architecture) 15.2 Structural Grid Planning & Spatial Adjacencies 15.3 Building Massing, Orientation & Envelope Integration 15.4 Case Study Strategy: Synthesizing Drawings, Code Sheets & Schedules

16 Chapter 16: Project Costs, Budgeting & Life-Cycle Analysis

16.1 Schematic Estimating Techniques: Area, Volume & Parametric Costs 16.2 Project Budgets: Contingencies, Overhead, Profit & Escalation 16.3 Life-Cycle Cost Analysis (LCCA) & Value Engineering

1.2 The Schematic Design Phase & Multi-Discipline Workflow

Key Takeaways Explain This Topic AI

Schematic Design establishes preliminary spatial relationships, scale and systems under the executed agreement.

Coordinate site, structure, MEP and envelope before fixing massing and floor heights.

Gross area equals net program plus circulation, services and other unassigned area; efficiency is net divided by gross.

An area or coverage check does not establish complete zoning or building-code compliance.

Last updated: October 2026

1.2 The Schematic Design Phase & Multi-Discipline Workflow

The Schematic Design (SD) phase represents the transition from abstract programmatic data to tangible architectural form. During SD, the architect evaluates the owner's program, schedule, budget, site conditions, and regulatory constraints to develop preliminary design solutions exploring spatial relationships, scale, building massing, and basic technical systems.

Because decisions made during Schematic Design establish fundamental structural grids, vertical core locations, mechanical plant strategies, and floor-to-floor heights, effective multi-disciplinary coordination at this early phase is essential to avoid catastrophic redesigns during Design Development (DD) and Construction Documents (CD).

Contractual Framework: AIA Document B101-2017

The executed owner–architect agreement establishes the architect's services. AIA B101-2017 Article 3.2 is a common framework for Schematic Design, but it may be modified. Review the actual agreement rather than treating a model contract as a statute.

Key Architect Obligations Under Article 3.2

Schematic Design includes reviewing the program and budget, evaluating site and regulatory constraints, exploring alternatives, and preparing documents and a preliminary cost estimate for the owner's review. B101 calls for submission of the Schematic Design documents and an estimate of the Cost of the Work and a request for owner approval. The executed agreement determines documentation and authorization requirements; do not invent a universal written-approval clause or rely on an unverified subsection number.

Standard Schematic Design Deliverables

Schematic Design deliverables communicate the project's conceptual scale, aesthetic character, and technical feasibility without documenting exact construction fastening or complete specifications.

Deliverable Item Typical Content & Level of Detail Interdisciplinary Contributors

Preliminary Site Plan Property lines, zoning setbacks, building footprint, vehicular/pedestrian circulation, parking stalls, preliminary grading contours, utility connections Architect, Civil Engineer, Landscape Architect

Schematic Floor Plans Single-line or early double-line walls, room titles, dimensioned functional spaces, programmatic adjacencies, primary circulation paths, structural grid layout, vertical core locations Architect, Structural Engineer, Program Planner

Preliminary Elevations Massing profiles, fenestration percentages, primary exterior materials, relationship to existing and finished site grades, overall building height Architect, Energy Consultant (fenestration ratio)

Building Sections Floor-to-floor heights, finished ceiling heights, preliminary plenum allowances, relationship of basement to water table, structural depth profiles Architect, Structural Engineer, Mechanical Engineer

Structural Narrative Proposed framing materials (structural steel, cast-in-place concrete, mass timber), primary bay spacing, lateral force-resisting system (shear walls vs. moment frames) Structural Engineer

MEP Systems Narrative Proposed heating/cooling plant (central chiller/boiler vs. VRF), air distribution strategy, main electrical service capacity, transformer and generator locations Mechanical, Electrical, and Plumbing Engineers

Outline Specifications High-level summary of proposed materials, systems, and performance standards organized broadly by MasterFormat divisions (rather than full 3-part CSI specs) Architect, Engineering Consultants, Specifier

Preliminary Cost Estimate Order-of-magnitude cost model based on gross square footage ($/GSF) or volume metrics, including appropriate schematic design contingencies Architect or Professional Cost Estimator

Loading diagram... Schematic Design Multi-Discipline Integration Workflow

Multi-Disciplinary Coordination Workflow

The architect acts as the primary integrator (the "master coordinator") of all engineering consultants. During Schematic Design, key technical inputs from each discipline establish fundamental spatial and financial boundaries:

1. Civil & Geotechnical Engineering

Geotechnical data : Use the geotechnical report to evaluate allowable bearing, total and differential settlement, seasonal groundwater, expansive or collapsible soils, and seismic site classification. Low bearing or high groundwater calls for comparison of engineered foundations, drainage, waterproofing and basement alternatives; a single bearing number does not automatically require piles or prohibit a basement.

Civil site utilities : Coordinate utility location, capacity and invert elevations. Fixtures that cannot discharge by gravity to an approved sewer connection may require an ejector system; a basement without such fixtures does not automatically require one merely because its floor is below the municipal sewer.

Stormwater Management : Site retention/detention pond footprints, pervious surfacing ratios, and bio-swale requirements determine buildable site boundaries.

2. Structural Engineering

Bay Spacing & Grid Alignment : Coordinating column grid spacing (e.g., 30 ft × 30 ft 30\text{ ft} \times 30\text{ ft} 30 ft × 30 ft for steel or 20 ft × 25 ft 20\text{ ft} \times 25\text{ ft} 20 ft × 25 ft for concrete flat slab) with subterranean parking layouts and upper-level partitions.

Member Depth Allowances : Rule-of-thumb structural depth sizing determines preliminary floor-to-floor heights. For example, a steel beam spanning 30 ft 30\text{ ft} 30 ft with a depth-to-span ratio of L / 20 L/20 L /20 requires a structural depth of 18 inches 18\text{ inches} 18 inches ( 360 inches / 20 360\text{ inches} / 20 360 inches /20 ), plus fireproofing.

Lateral Resisting System : Locating shear walls around vertical elevator/stair cores or positioning perimeter braced frames where they do not obstruct vision glazing or doors.

3. Mechanical (HVAC), Electrical & Plumbing (MEP)

Central Plant Space Requirements : Boilers, chillers, and primary air handling units (AHUs) typically require 2 % to 4 % 2\%\text{ to }4\% 2% to 4% of the building's gross area. Mechanical rooms must be positioned for outdoor air intake and exhaust louvers.

Vertical Shafts : Primary supply and return duct chases require approximately 15 to 25 square feet 15\text{ to }25\text{ square feet} 15 to 25 square feet per 10 , 000 square feet 10,000\text{ square feet} 10 , 000 square feet of conditioned floor area and must align vertically through all stories.

Electrical Service & Switchgear : Utility transformers (dry-type interior vs. liquid-filled exterior pad-mounted), main switchboard clearances, and emergency generator ventilation/fuel storage routing.

Plumbing Chases : Wet-column stacking for public restrooms, kitchenettes, and laboratory drainage, ensuring adequate gravity slope for sanitary piping ( 1 / 4 in/ft 1/4\text{ in/ft} 1/4 in/ft for pipes ≤ 2.5 inches \le 2.5\text{ inches} ≤ 2.5 inches ; 1 / 8 in/ft 1/8\text{ in/ft} 1/8 in/ft for pipes 3 to 6 inches 3\text{ to }6\text{ inches} 3 to 6 inches ).

Spatial Organization: Adjacency Matrices & Bubble Diagrams

Before drafting formal floor plans, architects use abstract diagrammatic tools to verify functional relationships:

Adjacency Matrix : A two-dimensional chart indexing every programmed space against all other spaces to designate degrees of required proximity: Direct Access (contiguous doors), Convenient Access (adjacent across a common corridor), Neutral / No Preference , or Separation Required (acoustic, visual, security, or hazardous contamination buffers).

Bubble Diagrams : Graphic translations of the adjacency matrix representing programmatic spaces as proportional circular bubbles connected by directional vectors representing circulation flows, sightlines, and acoustic boundaries.

Blocking & Stacking Diagrams : In multi-story structures, "stacking" determines the vertical assignment of program components (e.g., public retail on Ground Level, conference centers on Level 2, private offices on Levels 3–8), while "blocking" establishes horizontal departmental boundaries on individual floor plates.

Building Area Efficiencies & Net-to-Gross Calculations

A critical responsibility during Schematic Design is converting the owner's net functional program into a realistic gross building footprint that complies with zoning setbacks and Floor Area Ratio (FAR) caps.

Area Definitions

Net Assignable Area (NSF / Net Square Feet) : The actual usable floor space assigned to specific functional activities (e.g., private offices, classrooms, patient treatment rooms, retail sales floor). NSF excludes circulation, restrooms, and shafts.

Tare Area (Unassignable Area) : The supplementary space required to service the net functional areas, including corridors, lobbies, exit stairs, elevators, mechanical/electrical rooms, pipe chases, public restrooms, and structural column/wall thicknesses.

Gross Square Footage (GSF) : The total constructed building area measured to the exterior face of enclosure walls, encompassing all enclosed floor plates: GSF = NSF + Tare Area \text{GSF} = \text{NSF} + \text{Tare Area} GSF = NSF + Tare Area .

The Efficiency Ratio Formula

The relationship between net and gross area is expressed through the Efficiency Ratio :

Efficiency Ratio = Net Assignable Square Feet (NSF) Gross Square Feet (GSF) \text{Efficiency Ratio} = \frac{\text{Net Assignable Square Feet (NSF)}}{\text{Gross Square Feet (GSF)}} Efficiency Ratio = Gross Square Feet (GSF) Net Assignable Square Feet (NSF) ​

Gross Square Feet (GSF) = Net Assignable Square Feet (NSF) Efficiency Ratio \text{Gross Square Feet (GSF)} = \frac{\text{Net Assignable Square Feet (NSF)}}{\text{Efficiency Ratio}} Gross Square Feet (GSF) = Efficiency Ratio Net Assignable Square Feet (NSF) ​

Typical Building Type Efficiency Benchmarks

Building Typology Typical Efficiency Ratio Primary Drivers of Tare Area

Commercial Office Building 75%–85% Central elevator core, dual exit stairs, core restrooms, multi-tenant perimeter corridors

Multi-Family Residential 80%–85% Double-loaded residential corridors, dual exit stair towers, elevator vestibule

Higher Education / University 65%–72% Wide circulation corridors for class change surges, public breakout lounges, restrooms

Laboratories & Research 55%–65% Massive chemical fume hood exhaust plenums, utility chases, hazardous storage, ante-rooms

Acute Care Hospitals 50%–60% Wide 8-foot gurney corridors, interstitial mechanical floors, massive MEP shafts, isolation airlocks

Museums & Performing Arts 50%–60% Monumental atrium circulation, acoustic sound locks, public lobbies, loading docks

• Worked Scenario: Net-to-Gross Sizing for a Municipal Branch Library
• Scenario

A municipal library authority provides a functional program requiring 28 , 000 NSF 28,000\text{ NSF} 28 , 000 NSF of functional space (reading rooms, stacks, children's pavilion, staff offices, and meeting halls). Historical data indicates that branch libraries achieve a building efficiency ratio of 70 % 70\% 70% ( 0.70 0.70 0.70 ). The zoning ordinance limits maximum lot coverage to 40 % 40\% 40% on a 50 , 000 square foot 50,000\text{ square foot} 50 , 000 square foot parcel, and restricts building height to two stories.

Step-by-Step Resolution

Step 1: Calculate Total Required Gross Square Footage (GSF)

Required GSF = NSF Efficiency Ratio = 28 , 000 NSF 0.70 = 40 , 000 GSF \text{Required GSF} = \frac{\text{NSF}}{\text{Efficiency Ratio}} = \frac{28,000\text{ NSF}}{0.70} = 40,000\text{ GSF} Required GSF = Efficiency Ratio NSF ​ = 0.70 28 , 000 NSF ​ = 40 , 000 GSF .

Unassignable Tare Area = 40 , 000 − 28 , 000 = 12 , 000 square feet 40,000 - 28,000 = 12,000\text{ square feet} 40 , 000 − 28 , 000 = 12 , 000 square feet (dedicated to lobbies, stairs, elevator, mechanical rooms, restrooms, and wall footprints).

Step 2: Determine Footprint for a 2-Story Massing

Assuming equal floor distribution: Building Footprint = 40 , 000 GSF 2 stories = 20 , 000 square feet \text{Building Footprint} = \frac{40,000\text{ GSF}}{2\text{ stories}} = 20,000\text{ square feet} Building Footprint = 2 stories 40 , 000 GSF ​ = 20 , 000 square feet .

Step 3: Verify Zoning Lot Coverage Compliance

Maximum Allowable Lot Coverage = 50 , 000 sq ft parcel × 0.40 = 20 , 000 square feet \text{Maximum Allowable Lot Coverage} = 50,000\text{ sq ft parcel} \times 0.40 = 20,000\text{ square feet} Maximum Allowable Lot Coverage = 50 , 000 sq ft parcel × 0.40 = 20 , 000 square feet .

The proposed footprint ( 20 , 000 sq ft 20,000\text{ sq ft} 20 , 000 sq ft ) exactly matches the maximum allowable coverage ( 20 , 000 sq ft 20,000\text{ sq ft} 20 , 000 sq ft ), satisfying this coverage test. Setbacks, FAR, access, height, area and other applicable requirements still require separate checks.