Organize before you measure
Split the conduit takeoff by category, because each is measured and priced differently and carries different labor units:
- Feeders: from the one-line and feeder schedule; size by feeder; routed lengths from plans plus vertical risers. Measure each feeder individually.
- Branch circuits: homeruns and device-to-device runs from the power and lighting plans. Often measured by homerun plus assemblies.
- Special systems: fire alarm, low voltage, security and controls pathways, if in your scope.
- Underground and site: duct banks, PVC with concrete encasement, trench and backfill from site and electrical site plans, with burial depths from NEC Table 300.5 or the spec.
Then split each by raceway type and installation condition, because labor differs: EMT concealed in walls, EMT exposed, RMC or IMC in exposed or hazardous areas, PVC underground or in slab, and MC cable where the spec allows it (many commercial specs limit MC to final drops of a set length; check the spec).
Measuring runs
Measure horizontal runs along realistic routing, not straight lines between points: around structure, along corridors, avoiding duct mains. Then add vertical: drops to devices, rises into panels, and risers between floors from the riser diagram.
Fittings, bends and supports
Conduit length is only part of the takeoff. The NEC sets rules that turn length into fittings and supports:
- Couplings: EMT, IMC and RMC come in 10 ft lengths, so couplings follow stick count.
- Connectors: one at each box or enclosure entry.
- Supports: for EMT, NEC 358.30 requires securing within 3 ft of each box, cabinet or termination and at intervals of no more than 10 ft. RMC and IMC have their own spacing tables. Add hangers, rod, strut and seismic bracing if the spec requires it.
- Bends: no more than the equivalent of four quarter bends (360 degrees total) between pull points. Long feeder runs with many offsets need pull boxes; count them. The 2026 NEC adds Section 300.24 to make clear the 360-degree limit applies across transitions between raceway types.
- Expansion fittings: where runs cross building expansion joints, and on long PVC runs exposed to temperature change.
Many estimators carry fittings and supports in assemblies per 100 ft of conduit by size and type. That works on typical branch work; check assemblies against actual runs on complex feeders, exposed industrial work and racks.
Fill and sizing: price what is drawn, flag what is wrong
NEC Chapter 9, Table 1 limits conduit fill to 53% for one conductor, 31% for two and 40% for three or more. If a feeder on the drawings looks undersized for its conductors, write an RFI rather than resizing it silently. Price what is shown and state the question; resizing on your own makes your number non-comparable and the change ownership unclear.
Cable tray
Tray is measured by type (ladder, ventilated trough, solid bottom, wire mesh), width, depth and length, with fittings (horizontal and vertical elbows, tees, crosses, reducers) counted separately, supports by spacing, splice plates and bonding jumpers, and covers where specified. Conduit-to-tray connections are counted per conduit entering the tray. The 2026 NEC adds a minimum 12 in. access space above cable tray (Section 392.18(F), with exceptions), which can affect routing and supports in congested ceilings once your jurisdiction adopts it.
Waste and allowances
Apply waste per conduit type and installation from your own history rather than one blanket percentage. Large conduit and underground runs usually carry less waste than branch EMT, which loses an offcut at nearly every device. Keep waste on material; labor follows the installed footage and fittings.
Worked example
A second-floor homerun: 85 ft routed from the panel to the first receptacle in a group of six, 22 ft average between devices, conduit above a ceiling at about 10 ft, devices at 18 in. to center.
If the spec allows MC cable for drops, the 51 ft of drops become MC with fittings and the EMT drops to about 195 ft. That single spec sentence changes both material and labor. Each group should be traceable to its sheet and circuit numbers so a reviewer can check it.
Turning footage into labor
Most electrical estimators price labor from unit databases rather than crew-day guesses: the NECA Manual of Labor Units (the 2025–2027 edition is now delivered as an online database) or the labor units inside estimating systems such as Trimble Accubid, ConEst or McCormick. Labor units assume normal conditions; adjust for height, congestion, exposed versus concealed, existing buildings, and crew size. A homerun in a finished, occupied building takes far longer than the same footage in an open new floor.
Checks
- Feeder lengths against one-line distances and riser diagrams.
- Homeruns against panel schedules: every circuit shown has a homerun or is accounted for.
- Pull boxes where feeder bends exceed 360 degrees between pull points.
- Raceway types by location per the spec: exposed, wet, hazardous, underground, in slab.
- Spare and empty conduits shown on plans counted even though nothing is pulled.
- 2026 NEC items if adopted locally: listed cable ties for support, paired locknuts on RMC and IMC.
Common conduit takeoff mistakes
- Measuring straight lines instead of routed paths.
- Forgetting vertical runs at panels and risers between floors.
- Mixing feeder and branch conduit in one total so they price at the same labor unit.
- Ignoring raceway type changes by location.
- Leaving out spare conduits, sleeves and empty raceways for other trades.
- Applying branch assemblies to exposed industrial runs.
How AI speeds conduit takeoff
Conduit is repetitive measurement across many sheets, which is a good fit for AI-assisted takeoff with estimator review. RenderDraw proposes conduit and feeder runs by size and links every length to its sheet so the estimator reviews routing and allowances instead of tracing every run. Try it on a set with a free sample takeoff, or use the electrical takeoff guide for the full order of work.
