Carpentry — Detached One/Two Family Dwellings
Carpentry work on detached single or two-family residential dwellings. One of the most common construction codes.
💡 Example: $15,000 estimated annual premium
For a business with $100,000 in annual payroll under class code 5645, expected workers' comp premium is approximately $15,000 per year. Actual rates vary by state, carrier, and your experience modification factor.
What is class code 5645?
NCCI class code 5645 (Carpentry — Detached One/Two Family Dwellings) is used by workers' compensation insurance carriers to classify the work performed by your employees. Class codes determine the rate per $100 of payroll that you pay for coverage. Codes with higher injury risk (like roofing or tree care) have higher rates; clerical and office work has the lowest rates.
The construction industry typically falls in hazard group F (High risk). Many businesses in this category are misclassified by previous carriers — if your current policy lists a different code, it's worth a free review to make sure you're not overpaying.
How premium is calculated for code 5645
Your premium for class code 5645 starts with your gross annual payroll for employees doing this type of work. Divide by 100, multiply by the state-approved rate (typically between $$8.00 and $$22.00 for this code), then multiply by your experience modification factor (mod). New businesses start with a 1.0 mod; after a few years your mod reflects your actual claims history.
Related codes to consider
Some operations split between multiple class codes. Review these:
Common questions about code 5645
Is my business correctly classified under 5645?
Misclassification is one of the most common ways businesses overpay for workers' comp. We do free policy reviews and can dispute incorrect classifications with the carrier. Submit your business info above and we'll check at no cost.
Why is the rate range so wide?
Workers' comp rates for 5645 vary by state, carrier appetite, your experience modification factor, payroll size, and claims history. The range $$8.00-$$22.00 per $100 covers typical national pricing — your actual rate may be lower if you have clean claims history or larger payroll.
Can I get pay-as-you-go workers' comp for this class code?
Yes — most carriers offer pay-as-you-go for class code 5645, meaning premium is based on actual payroll each pay period instead of a large upfront deposit. This is especially useful for seasonal or growing businesses.