Commercial & Industrial Electrical Estimating (CSI Division 26)
Price complex electrical tenders with speed and accuracy. InSite Estimating provides electrical contractors with itemized conduit and wire takeoffs, lighting fixture schedules, feeder summaries, and NECA-aligned labor hours across commercial, industrial, and institutional projects.
Scope Overview & Specification Context
Electrical contracting is characterized by thousands of discrete components concealed within conduits, walls, and ceiling plenums. Estimating electrical systems by superficial square-foot averages is dangerous; differences in feeder lengths, gear amperage, transformer sizing, specialized lighting controls, and harmonic mitigation can create six-figure budget variances.
InSite Estimating analyzes electrical floor plans, one-line distribution diagrams, panelboard schedules, and lighting specifications. We quantify primary electrical services, feeder runs, branch circuitry, lighting controls, wiring devices, and emergency generator systems.
Who Relies on Our Electrical Estimating Services
Our takeoff deliverables directly support trade contractors and general builders during critical bidding windows:
- Electrical Subcontractors: Electrical Subcontractors bidding on commercial, industrial, and institutional projects
- Industrial Electrical: Industrial Electrical Contractors pricing motor control centers (MCC), process automation, and substations
- General Contractors: General Contractors validating electrical proposals and leveling competing trade subcontractor bids
Contract Drawings & Details Audited
To ensure complete trade quantification without missed scope or overlapping division boundaries, we review:
Itemized Quantities & Units Measured
Our takeoff sheets itemize all materials according to recognized trade fabrication and installation units:
- Conduit linear footage categorized by type (EMT, Rigid, PVC, MC Cable) and trade size (1/2" to 4")
- Conductor linear footage (THHN, XHHW) by wire size (#14 AWG to 750 kcmil) and conductor counts
- Lighting fixture counts cross-referenced to fixture types on architectural RCPs
- Wiring device counts: duplex receptacles, GFCI, USB receptacles, occupancy sensors, toggle switches
- Electrical distribution gear: main switchboards, panelboards, dry-type transformers, safety switches
Labor Burdens & Equipment Allocations
Trade pricing requires factoring labor productivity curves, crew composition, and specialized installation equipment:
- National Electrical Contractors Association (NECA) Manual of Labor Units alignment
- Installation height adjustments for high-bay warehouse and gym lighting requiring scissor lifts
- Conduit bending and pulling labor for large commercial feeder conduit banks
Standard Trade Deliverables Included
Every trade package is delivered in editable, audit-ready digital formats for immediate contractor use:
Division 26 Electrical Master Takeoff Workbook in Excel with live formula cells
Electrical Feeder Schedule detailing conduit sizes, wire gauges, ground wire, and run lengths
Color-Coded Vector PDF Electrical Plan Markups showing all branch home runs and fixture counts
Trade Inclusions & Boundary Demarcations
Preventing trade overlaps and unfunded scope gaps through crystal-clear inclusion and exclusion schedules:
Standard Trade Inclusions
- Main electrical utility service entrance, switchgear, metering, and transformer connections
- Distribution feeders, step-down transformers, subpanels, and motor connection hookups
- Complete lighting systems, emergency battery units, exit signs, and daylight harvesting controls
- Branch circuit wiring for convenience power, mechanical equipment connections, and specialty loads
Standard Trade Exclusions
- Utility company connection fees and transformer capital contribution costs
- Telephone, data, and audio-visual active network hardware (covered under Division 27)
Trade Takeoff & Quality Audit Workflow
Our systematic 6-phase review guarantees mathematical consistency, proper scale calibration, and spec alignment:
Single-Line Diagram Audit
Reviewing utility service entrance, main switchboard amperage, feeders, transformers, and panel schedules.
Feeder & Service Takeoff
Measuring feeder conduit and wire runs from one-line schematics and physical routing layouts.
Lighting & Control Quantification
Counting lighting fixtures, sensors, relay panels, and emergency battery units.
Branch Circuitry & Devices
Measuring branch home runs, conduit, wire, receptacles, motor connections, and disconnects.
CSI Trade Estimating & Quality Control Protocols
To protect trade subcontractors from bid-day omissions and disputed change orders, our estimators follow a multi-tier technical verification procedure:
Digital Planimeter & Scale Calibration
Every drawing sheet is calibrated against known architectural or structural dimensions before takeoff begins. We audit PDF scaling across sheet revisions to detect unannounced scaling distortions.
Cross-Division Scope Demarcation
We audit intersecting division notes—such as embedded anchor bolts, weld plates, penetrations, backing plates, and flashing—ensuring no scope is omitted between trade jurisdictions.
Material Waste & Lapping Calculations
Net in-place physical measurements are clearly isolated from gross installation material requirements, explicitly accounting for fabrication cuts, rebar lap splices, end-matching, and geometric site waste.
Addenda & RFI Scope Reconciliation
All issued addenda, engineer response RFIs, and revised drawing clouds are cross-checked against base sheets, ensuring your bid package reflects the latest contract documentation on bid day.
Frequently Asked Questions About Electrical Estimating Services
Frequently Asked Questions
Direct, technically accurate answers to common preconstruction estimating questions.
We measure home runs back to assigned electrical panels, add vertical drops and ceiling risers, and calculate circuit lengths based on designated circuit numbering. We then convert circuit lengths into conduit footage and wire footage (hot, neutral, and ground conductors) plus makeup allowances in junction boxes.
Get an Itemized Takeoff for Electrical Estimating Services
Upload your plans and project manual specifications. Our preconstruction team will provide an audit-ready takeoff package for your upcoming bid deadline.