17.7 Quantity Takeoff Estimating, General Conditions, Overhead & Alternates

Architect Registration Examination ARE 5.0

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1 Chapter 1: ARE 5.0 Structure, Delivery & Scoring

1.1 The Six Divisions: Items, Durations, Sections & Objectives 1.2 Eligibility, PSI Delivery, Fees, Scheduling & Rescheduling 1.3 Cut Scores, Score Reports, Provisional Feedback & Retakes

2 Chapter 2: Licensure Path, Item Types & Test-Day Strategy

2.1 Education Standard, AXP Hours, Settings & Reporting Rules 2.2 The NCARB Record, Score Validity Policy & Reciprocity 2.3 Item Types, Case Studies, Exam Tools, Breaks & Pacing

3 Chapter 3: Practice Management — Firm Resources, Conduct & the Work Environment

3.1 Assessing Practice Resources: Staffing, Development & Capital Investment 3.2 Regulating the Work Environment: FLSA, Antidiscrimination Law, OSHA & ADA Title III 3.3 Ethical Standards, the NCARB Rules of Conduct & the Standard of Care 3.4 Business Structures, Firm Ownership Rules & Practice-Wide Methodologies

4 Chapter 4: Practice Management — Firm Finances & Financial Health

4.1 Utilization, Overhead, Break-Even & Net Multiplier 4.2 Liquidity, Solvency & Reading Firm Financials Strategically 4.3 Accrual vs. Cash Accounting & the Architectural Balance Sheet 4.4 The Income Statement, Net Operating Revenue & Cash Flow Management

5 Chapter 5: Practice Management — Risk, Insurance & Business Development

5.1 Risk Management & the Firm’s Insurance Portfolio 5.2 Contractual Risk Allocation, Intellectual Property & Dispute Resolution 5.3 Client Requests, Compensation Methods, Project Delivery & Project Risk

6 Chapter 6: Project Management — Team, Resources & Consultants

6.1 Assembling the Project Team: Roles, Authority & Selection Criteria 6.2 Allocating & Managing Project Resources: Hours, Rates & Leveling 6.3 Consultant Selection, Qualifications-Based Selection & Scope Boundaries 6.4 AIA C401: Flow-Through, Consultant Standard of Care, Insurance & Payment

7 Chapter 7: Project Management — Work Planning, Scheduling & Budget Control

7.1 The Project Work Plan & Phase Fee Allocation 7.2 Work Breakdown Structures, Scheduling Methods & Dependency Logic 7.3 Critical Path Calculations, Float & Schedule Compression 7.4 Project Communication: Paths, Instruments, Meetings & the Record 7.5 Monitoring the Project Budget with Earned Value Management 7.6 Scope Creep, Additional Services & Written Authorization

8 Chapter 8: Project Management — Contracts, Approvals & Quality Control

8.1 AIA B101: Initial Information, Standard of Care & Basic Services 8.2 B101: Owner Duties, Cost of the Work, Copyright, Termination & Compensation 8.3 The Owner-Contractor Agreement & A201 Contractor Responsibilities 8.4 A201: Architect Administration, Changes, Claims & Separate Contractors 8.5 Regulatory Compliance, Authorities Having Jurisdiction & Project Approvals 8.6 Documenting a Project for the Specified Delivery Method 8.7 Quality Assurance, Quality Control, Constructability & the Record

9 Chapter 9: Programming & Analysis — Site & Environmental Conditions

9.1 Climate Classification, Solar Geometry & Passive Site Opportunities 9.2 Microclimate, Wind, Topography, Grading & Site Hydrology 9.3 Environmental Due Diligence: CERCLA Liability & Phase I / Phase II Assessments 9.4 Soil Mechanics, Geotechnical Investigation & Foundation Selection 9.5 Vehicular Circulation, Access Management, Parking & Emergency Access

10 Chapter 10: Programming & Analysis — Zoning, Codes & Site Infrastructure

10.1 Pedestrian Circulation, Site Utilities & Contextual Constraints 10.2 Zoning Authority, Euclidean and Form-Based Codes & Bulk Standards 10.3 Non-Conforming Uses, Variances, Easements & Parking Feasibility 10.4 IBC Occupancy Classification, Mixed Occupancy & Incidental Uses 10.5 IBC Construction Types, Fire-Resistance Ratings & Compartmentation

11 Chapter 11: Programming & Analysis — Building Programming & Feasibility

11.1 Programming Methodology, Net vs. Gross Area & Building Efficiency 11.2 Adjacency Matrices, Bubble Diagrams, Blocking & Stacking 11.3 Evaluating an Existing Building Against a Program 11.4 Reviewing Project Budget & Schedule Feasibility Against Scope 11.5 Identifying Building & Structural System Alternatives at Programming

12 Chapter 12: Project Planning & Design — Siting, Configuration, Codes & Life Safety

12.1 Building Siting, Neighborhood Context, Zoning Application & Configuration 12.2 IBC Allowable Area: Tabular Area, Frontage & Sprinkler Increases 12.3 Building Height, Story Limits, Mixed Occupancy & Unlimited Area Buildings 12.4 Means of Egress Components & Occupant Load Calculation 12.5 Exit Count, Remoteness, Egress Capacity, Travel Distance & Dead Ends 12.6 Accessible Routes, Slopes, Protruding Objects & Ramp Design 12.7 Door Clearances, Operating Hardware & Accessible Toilet Room Geometry

13 Chapter 13: Project Planning & Design — Structural & Mechanical Systems

13.1 Selecting Structural Systems: Steel, Concrete, Wood & Masonry 13.2 Lateral Force-Resisting Systems, Wind Loads & Seismic Design 13.3 Thermal Comfort, ASHRAE Standard 55 & Psychrometrics 13.4 HVAC System Typologies, Spatial Allocation & Central Plant Equipment 13.5 Potable Water Supply, Drainage, Waste & Vent Systems 13.6 Electrical Distribution, Emergency Power, Lighting & Daylighting 13.7 Fire Suppression, Standpipes, Conveying, Security & Communications

14 Chapter 14: Project Planning & Design — Envelope, Materials & Cost

14.1 Envelope Thermodynamics, Heat Transfer & Fenestration Performance 14.2 Thermal Bridging, Continuous Insulation & Thermal Mass 14.3 Passive Solar Heating, Natural Ventilation & Daylighting Architecture 14.4 Material Selection Criteria, Fire Performance & Vapor Permeance 14.5 Life Cycle Assessment, Embodied Carbon & Material Transparency 14.6 Galvanic Compatibility, Thermal Movement & Masonry Durability 14.7 Cost Estimating by Phase & Contingency Planning 14.8 Life-Cycle Cost Analysis, Present Value & Value Engineering

15 Chapter 15: Project Development & Documentation — Roofing, Waterproofing & Wall Assemblies

15.1 Low-Slope Roofing Systems, Membranes & Drainage Geometry 15.2 Flashing, Parapets, Copings & Roof Penetration Detailing 15.3 Steep-Slope Roofing & Below-Grade Waterproofing 15.4 Enclosure Control Layers & Rain Screen Cladding Systems 15.5 Vapor Retarders, Permeance Classes & Dew Point Control

16 Chapter 16: Project Development & Documentation — Connections, Coordination & Interiors

16.1 Structural Steel Connections & Base Plate Detailing 16.2 Concrete Reinforcing, Cover & Building Movement Joints 16.3 Sizing Structural, Mechanical, Electrical & Plumbing Components 16.4 Ceiling Plenum Coordination, Clash Detection & Level of Development 16.5 Vertical Chases, Shaft Walls, Through-Penetration Firestopping & Rated Joints 16.6 Interior Partition Framing, Head-of-Wall Details & Rated Gypsum Assemblies 16.7 Sound Isolation, STC, NRC & Reverberation Time 16.8 Door and Frame Construction & Fire Door Assemblies Under NFPA 80 16.9 Hardware Functions, Fire-Protection vs. Fire-Resistance Glazing

17 Chapter 17: Project Development & Documentation — Drawings, Specifications & Estimates

17.1 The National CAD Standard, Sheet Modules & Title Blocks 17.2 Drawing Cross-Referencing, Coordination & Revision Control 17.3 Documenting Site Features: Survey, Civil, Grading, Utilities & Landscape 17.4 The Project Manual & CSI MasterFormat Divisions 17.5 Section Numbering & the CSI Three-Part SectionFormat 17.6 Specification Methods & Document Precedence 17.7 Quantity Takeoff Estimating, General Conditions, Overhead & Alternates

18 Chapter 18: Construction & Evaluation — Procurement, Bidding & Preconstruction

18.1 Procurement Methods & AIA A701 Instructions to Bidders 18.2 Addenda Mechanics & Surety Bonds 18.3 The Preconstruction Conference & Administrative Protocols 18.4 Submittal Schedules, Long-Lead Items, Permits & Special Inspections 18.5 Bid Opening, Bidder Qualification & Discrepancy Rules 18.6 Alternates, Allowances, Unit Prices & Contract Award

19 Chapter 19: Construction & Evaluation — Observation & Contract Administration

19.1 The Architect’s Site Observation Role & the Means and Methods Firewall 19.2 Rejecting Non-Conforming Work, Special Inspections & Field Reports 19.3 Submittal Workflow, Review Responsibility & Action Stamps 19.4 Delegated Design, Design-Assist & Deferred Submittals 19.5 Requests for Information & Architect’s Supplemental Instructions 19.6 Change Orders, Construction Change Directives & Instrument Comparison

20 Chapter 20: Construction & Evaluation — Payment, Closeout & Evaluation

20.1 The Schedule of Values & the Application and Certificate for Payment 20.2 Stored Materials, Retainage, Certification Duties & Withholding 20.3 Substantial Completion & the Punch List Protocol 20.4 The Certificate of Substantial Completion & Its Legal Consequences 20.5 Final Completion, Final Payment & the Closeout Package 20.6 Warranty Administration, the Eleven-Month Walk-Through & Post-Occupancy Evaluation

17.7 Quantity Takeoff Estimating, General Conditions, Overhead & Alternates

Key Takeaways Explain This Topic AI

A quantity takeoff measures actual quantities from the documents and prices each with labor, material, and equipment, making it the most accurate estimating method.

Net measured quantities must be increased by a waste factor appropriate to the material and the installation geometry.

General conditions costs are project-specific field overhead such as supervision, temporary facilities, and cleanup, carried in Division 01.

Contractor overhead and profit covers home-office overhead and margin, applied as a percentage on top of the cost of the work.

An add alternate prices scope added to the base bid and a deduct alternate prices scope removed from it, and both must be described so precisely that every bidder prices the same thing.

Last updated: September 2026

Complementary Documents, Conflict Resolution & Precedence

During bidding and construction, discrepancies inevitably arise between graphic representations on the drawings and written requirements in the Project Manual.

The Doctrine of Complementary Documents (AIA Document A201)

A central canon of standard American construction contracts is codified in AIA Document A201 Section 1.2.1 :

"The Contract Documents are complementary, and what is required by one shall be as binding as if required by all; performance by the Contractor shall be required only to the extent consistent with the Contract Documents and reasonably inferable from them as being necessary to produce the indicated results."

Under this complementary doctrine, the Contract Documents are legally designed to be interpreted as an integrated whole. The architect is not legally obligated to duplicate every item on both the drawings and specifications. If an item is depicted on the drawings (e.g., an acoustical tile ceiling shown in a reflected ceiling plan) but inadvertently omitted from the finish schedule or specifications, or vice versa, the contractor is contractually bound to provide that item without an increase in the contract sum or contract time.

Order of Precedence: AIA Standard vs. Customized Contracts

AIA Philosophy (No Precedence Clause): Standard AIA contract documents (such as AIA A101 and A201) intentionally omit an Order of Precedence clause . The AIA asserts that establishing an artificial legal hierarchy (such as declaring that specifications always supersede drawings) encourages careless document coordination and can allow an outdated, generic boilerplate specification clause to override a carefully resolved, site-specific architectural detail. Instead, A201 obligates the contractor to examine the documents carefully and promptly submit a Request for Information (RFI) to the architect upon discovering an error, inconsistency, or omission (Section 3.2.2). The architect then issues an official written interpretation or clarification (Section 4.2.11).

Judicial Common-Law Rules of Interpretation: When an irreconcilable conflict between documents ends up in litigation or arbitration without an explicit contractual precedence clause, courts apply established common-law rules of contract interpretation:

Specifications Govern Quality; Drawings Govern Quantity: Written specifications determine materials, quality standards, finishes, and workmanship; drawings determine quantities, geometric dimensions, physical locations, and spatial relationships.

Specific Governs General: A large-scale detailed drawing (e.g., a 1-1/2" = 1'-0" wall section detail) governs over a small-scale general plan (e.g., a 1/8" = 1'-0" overall floor plan).

Written Words Govern Figures: Explicit spelled-out text notes govern over graphic symbols; figured numerical dimensions govern over dimensions scaled directly with a ruler.

Chronological Hierarchy: Addenda issued during bidding supersede original drawings and specifications; fully executed Change Orders signed by the Owner, Architect, and Contractor supersede all prior contract documents.

Customized Owner Precedence Clauses: Private corporate and public institutional clients frequently amend standard agreements to insert a rigid legal Order of Precedence Clause . A typical hierarchy reads: (1) Signed Change Orders, (2) Signed Owner-Contractor Agreement, (3) Addenda, (4) Supplementary Conditions, (5) General Conditions (A201), (6) Division 01 General Requirements, (7) Technical Specifications (Divisions 02–49), (8) Large-Scale Detail Drawings, (9) Small-Scale Drawings. Architects must strictly align their documentation practices with any precedence clause contained in the owner's customized agreement.

Contractor Quantity Takeoff Estimating & Cost Structure

To prepare a competitive, profitable lump-sum or Guaranteed Maximum Price (GMP) bid, general contractors and commercial cost estimators perform a comprehensive Quantity Takeoff (QTO) . The quantity takeoff converts two-dimensional architectural drawings and three-dimensional BIM models into an exhaustive bill of materials and discrete labor activities. ANATOMY OF A CONTRACTOR LUMP-SUM BID

┌─────────────────────────────────────────────────────────────────────────────┐
│ DIRECT CONSTRUCTION COSTS (Hard Costs) │
│ • Net Material Takeoff Quantities + Material Waste Factors (5% to 10%) │
│ • Direct Trade Labor (Hourly Wage + Burden + Productivity Rates) │
│ • Trade Subcontractor Lump-Sum Bids (Mechanical, Electrical, Concrete) │
│ • Construction Equipment Rental (Scissor lifts, backhoes, concrete pumps) │
├─────────────────────────────────────────────────────────────────────────────┤
│ GENERAL CONDITIONS COSTS (Division 01 Jobsite Field Overhead: 6% to 12%) │
│ • On-site Project Superintendent, Project Manager, Field Engineer salaries │
│ • Jobsite Field Office Trailer, computers, printers, internet │
│ • Temporary Utilities (Electric power, water, winter heating, lighting) │
│ • Site Security, perimeter fencing, barricades, signage │
│ • Waste Management (Dumpsters, debris hauling, recycling mandates) │
│ • Scaffolding, staging, hoists, cranes, safety equipment │
│ • Building permits, plan check fees, testing and inspection services │
├─────────────────────────────────────────────────────────────────────────────┤
│ CONTRACTOR OVERHEAD & PROFIT (OH&P: 8% to 15% combined) │
│ • Home Office Overhead (Corporate office rent, executive salaries, legal) │
│ • Contractor Net Profit Margin (Risk reward, return on capital) │
├─────────────────────────────────────────────────────────────────────────────┤
│ CONTINGENCY & BONDS │
│ • Contractor Estimating Contingency (design refinement allowance) │
│ • Performance and Payment Bonds (typically 1% to 2% of total contract) │
└─────────────────────────────────────────────────────────────────────────────┘
Net Takeoffs vs. Material Waste Factors

Estimators measure net physical dimensions directly from the drawings using specialized takeoff software (e.g., Bluebeam Revu, On-Screen Takeoff) or direct BIM model quantification:

Cubic Yards (CY): Concrete foundations, footings, structural slabs, mass excavation, and backfill. (Calculated as Length [ft] × Width [ft] × Thickness [ft] / 27 \text{Length [ft]} \times \text{Width [ft]} \times \text{Thickness [ft]} / 27 Length [ft] × Width [ft] × Thickness [ft] /27 ).

Square Feet (SF) or Squares: Drywall partitions, acoustic ceilings, ceramic tile, resilient flooring, wall sheathing, building wraps, exterior insulation, paint, and roofing membranes. (One roofing "square" = 100 sq ft 100\text{ sq ft} 100 sq ft ).

Linear Feet (LF): Cold-formed steel studs, wood framing plates, interior baseboards, millwork moldings, plumbing piping, electrical conduits, and perimeter flashing.

Piece / Unit Count (Each): Doors, frames, locksets, luminaires, plumbing fixtures, roof drains, and kitchen equipment.

Weight in Tons / Hundredweight (cwt): Structural steel wide-flange beams and columns (calculated by multiplying member linear footage by its nominal pound-per-foot weight; e.g., 100 LF 100\text{ LF} 100 LF of W14x90 steel weighs 9 , 000 lbs 9,000\text{ lbs} 9 , 000 lbs , or 4.5 tons 4.5\text{ tons} 4.5 tons ).

Mandatory Waste Factors: Estimators never purchase raw net takeoff quantities. Unavoidable geometric cutting losses, edge trimmings, drop-off scrap, transport breakage, and material lap joints require adding realistic waste allowances:

Gypsum Board: 5 % 5\% 5% to 10 % 10\% 10% waste (elevated to 12 % 12\% 12% to 15 % 15\% 15% in spaces with complex curved soffits, angular walls, or high reveals).

Ceramic / Porcelain Tile: 10 % 10\% 10% to 15 % 15\% 15% waste (required for perimeter cut tiles, grout alignment, pattern matching, and owner-mandated attic stock).

Cast-in-Place Concrete: 5 % 5\% 5% to 8 % 8\% 8% waste (accounting for trench over-excavation, formwork deflection, and spillage).

Framing Lumber & Studs: 10 % 10\% 10% to 15 % 15\% 15% waste.

General Conditions Costs (Division 01 Field Overhead)

General Conditions costs encompass the indirect, operational expenses incurred on the physical jobsite that cannot be allocated to a single trade or material. These costs represent the logistical infrastructure required to execute the work specified in Division 01. On typical commercial projects, General Conditions represent 6 % 6\% 6% to 12 % 12\% 12% of the direct construction cost .

Contractor Overhead and Profit (OH&P)

To the sum of direct trade costs and General Conditions costs, the contractor applies markups for overhead and profit:

Home Office Overhead (Indirect Overhead): Recoups corporate operating costs incurred off-site, including corporate headquarters rent, executive and accounting salaries, marketing, legal counsel, and general corporate liability insurance; typically 2 % 2\% 2% to 5 % 5\% 5% .

Contractor Profit: The net financial return earned by the contractor for assuming construction risk, managing capital, and delivering the project; typically 3 % 3\% 3% to 6 % 6\% 6% .

Combined OH&P: In commercial construction bidding, combined OH&P typically ranges from 8 % 8\% 8% to 15 % 15\% 15% , fluctuating based on local economic competition, project complexity, and delivery method.

Bid Alternates and Unit Prices

To safeguard the owner's budget against market volatility on bid day, architects utilize Bid Alternates and Unit Prices structured within Division 01 (Section 01 20 00 Price and Payment Procedures).

Add Alternates vs. Deduct Alternates

An Alternate is a clearly defined, modular package of work for which the bidder submits a separate, discrete price addition or deduction from the base bid:

Add Alternate: Specifies an additive item of work that the owner may choose to incorporate into the contract if the base bid comes in below the owner's budget (e.g., "Add Alternate 1: Provide high-performance standing-seam zinc roofing in lieu of standard SBS-modified bitumen roofing").

Deduct Alternate: Specifies a scope reduction or material downgrade that the owner may select if base bids exceed the budget (e.g., "Deduct Alternate 1: Delete finished acoustical wood ceiling panels in the auditorium and provide standard painted drywall").

Professional Standard of Care: Architects should strongly prefer Add Alternates over Deduct Alternates. When contractors price deduct alternates during competitive bidding, they frequently offer disproportionately small financial credits—often withholding the labor savings, general conditions, and profit margin originally baked into that work. Conversely, add alternates foster fierce competitive pricing among bidders eager to win the contract, resulting in fair market valuations for the added scope.

Unit Prices

A Unit Price is a predetermined fixed price per unit of measurement (e.g., per cubic yard of mass rock excavation, per linear foot of helical micro-pile, per square foot of concrete slab scarification) established in the bid documents:

Unit prices are utilized when the exact physical quantity of a required item of work cannot be reliably determined prior to field construction (most commonly in subsurface foundation conditions, utility relocations, or structural concrete restoration).

The contractor's quoted unit price includes all necessary material, labor, equipment, waste, general conditions, overhead, and profit for that specific unit.

If the geotechnical engineer encounters 150 CY 150\text{ CY} 150 CY of unexpected subterranean bedrock during basement excavation, the contractor is reimbursed based on the predetermined unit price (e.g., 150 CY × $ 180 / CY = $ 27 , 000 150\text{ CY} \times \text{\textdollar}180/\text{CY} = \text{\textdollar}27,000 150 CY × $ 180/ CY = $ 27 , 000 ), completely avoiding contentious change order disputes and schedule delays.