General contractors run a workforce that's mostly project managers, superintendents, and field crews wrapped around a substantial subcontractor network. The PEO comparison hinges on workers comp class-code accuracy across multi-trade work, certificate-of-insurance discipline for subs, prevailing-wage compliance on public projects, and benefits depth that helps you retain the PMs and supts who actually run your jobs. This page covers what actually matters when you're shopping providers.
Three things push GC owners off generic payroll software:
The first is workers comp class-code over-coding. The single biggest pitfall for GCs: defaulting all field labor to the highest-rate class code when legitimate splits exist. Concrete crews shouldn't be on a carpentry code; supervisory time shouldn't be on a labor code; office staff shouldn't be on a construction code. PEOs with construction experience know how to split this honestly. Generic ones don't, and the over-coding can cost a mid-sized GC $30K–$80K a year.
The second is prevailing-wage admin. If you do federal or state public work, you're filing weekly Davis-Bacon WH-347 certified payroll with fringe-benefit documentation. Generic payroll vendors often don't support this. PEOs experienced with trades handle WH-347 as routine, often with fringe optimization built in.
The third is PM and superintendent retention. The construction labor market is tight for experienced PMs and supts — they're the recruiting battleground. Group health, 401(k), and EPLI coverage at PEO pool rates often closes the benefits gap between you and larger competitors.
The single biggest workers comp pitfall for GCs: defaulting all field labor to the highest-rate class code when legitimate class splits exist. PEOs with construction experience know how to split this honestly — concrete on its code, carpentry on its code, supervisory time on executive-supervisor (5606), office on 8810. Generic PEOs often don't ask, and the over-coding can cost a mid-sized GC $30K–$80K a year.
Your class codes depend on the work you actually self-perform. Most GCs see some mix of NCCI 5645 (residential carpentry), 5403 (commercial concrete/carpentry), 5474 (painting if self-performed), with PMs and supts ideally on 5606 (executive supervisor) and office staff on 8810. State variations apply.
What drives your number:
Class-code accuracy. The biggest single lever. A PM who spends 80% of time on jobsite management and 20% on hands-on work shouldn't be coded as a laborer. A specialist PEO will split this honestly; a generic one won't ask.
Mod handling. Carry, blend, or replace. Cleanest with carry if your mod is favorable.
Subcontractor COI discipline. If a sub's workers comp policy lapses and an injury happens on your jobsite, the carrier can come after you for coverage gap. PEOs with construction experience integrate with COI-tracking platforms or handle it via HRIS. Generic ones don't.
Claims management for falls and struck-by. Construction's severe-claim profile. Specialist PEO claims infrastructure matters for mod outcomes.
Replacing a senior project manager costs $35K–$80K in recruitment, ramp-up, and project disruption — and the disruption can derail multiple active jobs. Replacing a superintendent costs $25K–$60K with direct project-schedule impact.
The PEO pull on retention is mostly about benefits depth competing with larger GCs. Larger firms offer better health plans, 401(k) matching, EPLI coverage, and parental leave that mid-sized GCs can't economically match standalone. PEO pool benefits close that gap. Vehicle allowance and per-diem coordination — common GC comp components — also flow cleanly through PEO payroll.
| Where you are | Honest answer |
|---|---|
| Under 10 employees, single market | Workable on payroll software. Revisit when prevailing-wage exposure grows or PM/supt retention pressure mounts. |
| 10–30 employees, any prevailing-wage work | WH-347 admin eats time fast. Trades-experienced PEO usually pays back. |
| 30–80 employees, multi-state commercial | Usually clear PEO case. Sweet spot for GCs — class-code accuracy + benefits + compliance offload. |
| 80+ employees, established | In-house HR + benefits broker often economic. PEO viable; some firms transition to ASO. |
PEOs handle W-2 employees only — subs stay outside payroll. The PEO can support COI tracking, sub onboarding paperwork, and 1099 issuance if you process those payments. Sub-vs-W2 classification scrutiny (IRS, DOL, state) is increasingly real for construction; a PEO with GC experience flags risk patterns.
The PEO handles HR and payroll. AIA contract administration (G702 pay apps, G706 contractor's affidavits, change orders, payment certifications) stays with your contracts admin or accounting team. The PEO doesn't replace your construction-accounting workflow — it handles the people side.
For unionized GCs, the CBA governs wage rates and benefits for bargaining-unit employees. A PEO can handle payroll, HR compliance, and supplemental benefits for non-bargaining-unit office staff. Confirm during demo how the PEO supports CBA wage rates and union-dues remittance.
Quality construction PEOs handle multi-class work routinely — splitting labor between classifications when work actually changes, applying executive-supervisor (5606) coding to PMs and supts. Walk through a specific project example during the demo to verify the PEO handles your work patterns correctly.
The three mod-handling models, class-code mechanics, claims management for construction-injury exposure.
Workers comp deep diveRelated trade with prevailing-wage and Davis-Bacon overlap; class-code mechanics translate.
Electrical deep diveSeven-dimension framework, questions to ask, red flags to watch.
Read the buyer's guideIf you're shopping PEOs for the topic on this page, these adjacent verticals share workforce, regulatory, or buyer dynamics worth comparing alongside it.
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Compare PEOs for general contractors