NCCI class code 5403: carpentry, residential
NCCI class code 5403 covers residential carpentry on dwellings of three stories or less. The median rate across our dataset runs $4.80 to $9.20 per $100 of payroll, putting it near the top of the standard construction-code rate range. This page covers what 5403 includes, what it excludes, why the rate is so high, and the classification errors that trigger reclassifications at audit.
What 5403 includes
The NCCI Scopes Manual phraseology for 5403 covers residential carpentry on dwellings of three stories or less. Specifically:
- Framing: wall framing, floor framing, roof structure framing (when performed by the carpentry crew, not a separate roofing crew)
- Sheathing: wall sheathing, floor sheathing, roof sheathing (again, when performed by the framing crew)
- Exterior trim: fascia, soffit, exterior trim boards, siding installation when integrated with the framing operation
- Interior trim: door installation, baseboard, crown molding, casing
- Millwork installation: cabinets and built-ins (some states classify built-in cabinet installation under 5437; check state-specific rules)
The “three stories or less” cutoff matters. Most single-family homes and townhomes fall under 5403. Larger multi-family structures (apartment buildings of four stories and above) typically fall under 5645 or higher-rated codes.
What 5403 excludes
The most common exclusions:
- Roofing (NCCI 5551). Even when performed on a 5403-classified building, roofing operations carried out by a separate roofing crew belong in 5551. The dividing line is the crew, not the structure.
- Commercial structures (NCCI 5645). Office buildings, retail, light-industrial structures of any height require 5645 or related commercial-construction codes.
- Concrete and masonry (separate codes). Foundation work, concrete framing, and masonry exterior walls are not 5403. They carry their own codes (NCCI 5022 for masonry, separate codes for concrete formwork and finishing).
- Cabinetmaking shop work. Shop-only cabinet fabrication with no field installation is a manufacturing classification, not 5403.
- Painting. Painting work, even when performed in conjunction with carpentry, is NCCI 5474 (painting, NOC).
State-by-state rate range
Sample 5403 rate medians from our dataset across states where the code is filed [cells/cells-summary.json]:
- Indiana: approximately $5.20 to $7.10
- Wisconsin: approximately $5.80 to $8.20
- Illinois: approximately $6.40 to $9.10
- Texas: approximately $5.40 to $8.40
- Florida: approximately $6.20 to $9.80
These are bureau loss costs before carrier LCM and modifiers. Final policy rates after LCM, EMR, and schedule credit can run 1.5x to 2.0x the bureau base.
For California, WCIRB publishes advisory pure premium for the equivalent California carpentry classification. The CA-specific code may differ from 5403; check the current WCIRB filing.
Why 5403 rates are so high
Three exposures drive the 5403 loss cost:
1. Falls. Roof framing, second-story exterior trim, and ladder work produce a high frequency of fall claims. OSHA’s fall-protection standards (29 CFR 1926.501) require fall protection above six feet in residential construction. Compliance costs (harnesses, anchor points, training) directly affect loss frequency.
2. Cuts and amputations. Power-saw and pneumatic-nailer injuries are the dominant cause of upper-extremity claims in carpentry. Hand and finger amputations are scheduled-injury items in most state body-part schedules and produce significant PPD values.
3. Repetitive-strain and back injuries. Lifting framing lumber, sheathing sheets, and roof structures generates back, shoulder, and knee injuries. High frequency, moderate severity, with a long tail of medical and PPD costs.
The combination of high frequency (carpentry crews work in motion all day) and severe-claim exposure (falls, amputations) produces the highest construction-code rates in most states.
Common classification errors
The errors that trigger audit reclassifications for residential carpentry contractors:
1. Roofing crew under 5403. A carpentry contractor who employs a separate roofing crew for shingle work but classifies the roofers under 5403 is under-classified. Auditors reclassify roofers to 5551 at the higher rate.
2. Commercial work under 5403. A residential carpentry contractor who takes on a commercial tenant-improvement job and continues classifying the work under 5403 will be reclassified at audit. Commercial carpentry is typically 5645 or a similar commercial code.
3. Apprentices and helpers under clerical (8810). Field apprentices and helpers belong in 5403 regardless of their wage rate. Auditors reclassify if necessary.
4. Working owners under 5403 alone. A working owner who handles both field carpentry and office administration gets split allocations. Without time records, auditors default to 5403 for all owner payroll.
5. Subcontractor labor without COIs. General contractors who use uninsured carpentry subcontractors get the sub’s payroll added to the GC’s policy at audit, classified under 5403 in most cases. The COI requirement (current workers comp coverage from the sub, with the GC named as certificate holder) is the protection.
Loss-control levers that move EMR
Programs that move 5403 EMR favorably:
- Documented fall-protection program with anchor-point inspection, harness inspection, and competent-person training per OSHA 29 CFR 1926.502
- Power-tool training and saw-guard maintenance with documented annual refresher training
- Light-duty return-to-work program that allows injured workers to return on modified duty during recovery, reducing TTD weeks paid
- Pre-task hazard assessment at each new job site, documented in writing
- Job-site safety inspections with photo documentation, ideally weekly
A claim-free three-year history typically pulls EMR to 0.85 or below. A single severe claim (fall fatality, spinal injury) pushes EMR above 1.30 for the duration the claim sits in the calculation.
What this means for premium
A worked example:
A residential-carpentry contractor in Indiana with $750,000 annual payroll, $700,000 allocated to 5403 and $50,000 allocated to 8810 (office staff). Indiana 5403 bureau rate: $6.20 per $100. Indiana 8810 bureau rate: $0.30 per $100.
- 5403 manual premium: $700,000 / $100 × $6.20 = $43,400
- 8810 manual premium: $50,000 / $100 × $0.30 = $150
- Combined manual premium: $43,550
- Apply carrier LCM of 1.50: $65,325
- Apply EMR of 0.95 (3-year claim-free): $62,059
- Apply schedule credit of 10% for documented safety: $55,853
Final policy premium: approximately $55,853.
The same contractor in California, with substantially higher carpentry rates and the WCIRB framework, would produce a noticeably different final number.
This is a worked example for illustration only.
How 5403 differs from related codes
- 5645 (carpenter, dwellings, more than three stories): covers carpentry on dwellings of four stories or more. Higher rate than 5403 due to elevation exposure.
- 5651 (carpenter, dwellings, three stories or less, detailed): state-specific variant in some jurisdictions
- 5474 (painting, NOC): separate code for painting operations
- 5437 (cabinet installation): some states carve cabinet installation into 5437 instead of 5403
- 5551 (roofing): separate code for roofing crews
Related resources
This is general information, not legal or insurance advice. Consult a licensed broker or attorney for your specific situation.