At 100 employees, your construction company has hit a threshold where PEO economics and operational demands shift significantly. You’re no longer a small crew where the owner handles HR between job sites. You’ve got project managers, superintendents, laborers across multiple sites, and probably a mix of union and non-union workers. The workers’ comp exposure alone at this size can make or break your margins.
This guide walks through seven specific strategies for evaluating and selecting a construction PEO when you’re operating at this headcount—where the stakes are higher, the compliance requirements are more complex, and the wrong choice costs real money. We’ll skip the generic PEO overview and focus on what actually matters for a 100-person construction operation.
1. Audit Your Workers’ Comp Mod Rate Before You Shop
Your experience modification rate is the single biggest factor that determines which PEOs will even quote you—and what they’ll charge if they do. If you walk into PEO conversations without knowing your current mod rate, your loss history from the past three years, and how those numbers compare to industry benchmarks, you’re negotiating blind.
Construction companies with high insurance mod rates often get declined by PEOs that don’t specialize in high-risk industries. Others will quote you, but the pricing reflects the risk they’re taking on. The difference between a 0.9 mod and a 1.3 mod can mean thousands of dollars per month in PEO fees, even with the same headcount.
What You Need to Pull Together
Request your experience mod worksheet from your current workers’ comp carrier. This document breaks down your actual losses versus expected losses for your industry classification. You’ll also want copies of any open claims and their reserve amounts—these affect your future mod calculations even if they haven’t closed yet.
If you’ve had a bad year with injuries, understand how that’s trending. A single severe injury can spike your mod for three years. Some PEOs have safety programs that can help bring that number down over time, but they need to see you’re taking corrective action, not just shopping for cheaper coverage.
How This Affects PEO Selection
PEOs that specialize in construction typically have higher risk tolerance and access to workers’ comp programs designed for your industry. They understand that a framing crew will have different loss patterns than an HVAC installation team. Generic PEOs that serve mostly office-based clients often don’t have the appetite or expertise to properly underwrite construction risk.
If your mod rate is solid—say, below 1.0—you have leverage. You can negotiate better pricing and potentially access dividend programs where you get money back if the PEO’s overall workers’ comp performance is good. If your mod is high, focus on PEOs that offer robust safety programs and claims management, not just the lowest quoted rate.
2. Map Your Multi-Site Payroll Complexity First
Construction payroll isn’t straightforward. You’ve got crews working across state lines, certified payroll requirements on government contracts, union versus non-union rates, and prevailing wage laws that vary by project. At 100 employees, you’re almost certainly dealing with at least some of this complexity.
Before you talk to a single PEO, document exactly what your payroll operation looks like. Which states are you working in? How many projects require Davis-Bacon certified payroll? Do you have union workers whose wages get reported to trust funds? Are you tracking job costing by project, and does that need to integrate with your accounting system?
Certified Payroll Capabilities
Not all PEO platforms handle certified payroll natively. Some require you to export data and reformat it manually, which defeats the entire purpose of outsourcing payroll. Others charge extra for certified payroll as an add-on service, which can get expensive when you’re running multiple prevailing wage jobs simultaneously.
Ask potential PEOs to show you their certified payroll workflow. Can they generate the required reports automatically? Do they stay current with federal and state-specific formatting requirements? Have they handled projects in the jurisdictions where you operate?
Multi-State Registration and Compliance
Every state where you have employees working requires payroll tax registration, unemployment insurance, and workers’ comp coverage. When you join a PEO, they typically handle these registrations under their master accounts. But the transition process can get messy if they don’t have existing infrastructure in your states.
Construction companies that cross state lines frequently need PEOs with broad geographic coverage and experience managing the compliance nuances in each jurisdiction. A PEO that’s great in Texas might have zero presence in California, and that gap creates problems when your crew heads west for a six-month project.
3. Verify Construction-Specific Classification Code Experience
Workers’ comp classification codes in construction are granular and consequential. The difference between code 5403 (carpentry) and code 5645 (carpentry in connection with construction or repair of detached one or two family dwellings) can be hundreds of dollars per $100 of payroll. Misclassification—whether intentional or accidental—creates audit exposure and potential premium adjustments that can wreck your budget.
PEOs that don’t specialize in construction often struggle with proper class code assignment. They see “construction worker” and apply a generic code, not understanding that your electricians, roofers, and concrete finishers all carry different risk profiles and should be classified separately.
Ask About Their Construction Client Base
How many construction companies does the PEO currently serve? What types—residential, commercial, heavy civil? Do they have clients in your specific trades? A PEO with 200 construction clients has seen the classification scenarios you’re dealing with. A PEO with five construction clients is learning on your dime.
Request references from construction companies similar to your size and scope. Ask those references whether they’ve experienced classification issues, audit problems, or disputes over how workers were coded. This is where you find out if the PEO’s construction expertise is real or just marketing language.
Audit Protection and Code Accuracy
Most PEO contracts include language about workers’ comp audits and who’s responsible if codes were wrong. You want clarity on this before you sign. If the PEO misclassifies your workers and an audit generates a $50,000 premium adjustment, does that fall on you or them?
Better PEOs will guarantee their code assignments and cover audit adjustments that result from their errors. They’ll also have a formal process for reviewing classifications annually as your workforce mix changes. Weaker PEOs will bury liability clauses in the contract that push audit risk back onto you.
4. Negotiate Safety Program Integration, Not Replacement
If you’ve been operating at 100 employees for any length of time, you’ve already built safety protocols. You have toolbox talks, site-specific hazard assessments, equipment inspection procedures, and OSHA recordkeeping systems. These aren’t generic—they reflect the actual risks your crews face on your projects.
Many PEOs show up with their own safety programs and expect you to adopt them wholesale. The problem is these programs are often designed for broad applicability across industries, not tailored to construction realities. A generic ladder safety module doesn’t replace the site-specific fall protection plan you need for a five-story steel erection project.
Preserve What’s Working
The right approach is integration, not replacement. Your existing safety protocols should remain in place, and the PEO’s resources should supplement them—additional training content, updated OSHA compliance tracking, access to safety consultants when you need specialized expertise.
Clarify upfront which safety responsibilities stay with you and which transfer to the PEO. In most co-employment arrangements, you retain day-to-day safety management because you control the work sites. The PEO provides support, templates, and compliance oversight. If a PEO tries to take over your entire safety program remotely, that’s a red flag.
OSHA Recordkeeping and Liability
OSHA recordkeeping in a co-employment relationship creates questions about which entity is the “employer of record” for safety violations. This needs to be spelled out contractually. If OSHA shows up at your job site and issues citations, who’s named? Who’s responsible for abatement? Who pays the fines?
Most construction-focused PEOs understand this and have clear protocols. They’ll help you maintain your OSHA 300 logs, provide guidance on recordability determinations, and support you through inspections—but they’re not taking legal responsibility for your site conditions. Understanding PEO risk mitigation helps you set realistic expectations for what protection you’re actually getting.
5. Structure the Benefits Package for Field vs. Office Split
Your workforce at 100 employees isn’t homogeneous. You’ve got salaried project managers and estimators in the office. You’ve got hourly field crews, some of whom work year-round and others who are seasonal. You might have union workers whose benefits come through trust funds, and non-union workers who need coverage through the company.
A one-size-fits-all benefits package doesn’t work for this mix. Office staff expect robust health insurance, 401(k) matching, and paid time off. Field workers care more about immediate take-home pay and may prefer higher wages over expensive benefits they won’t use. Seasonal workers often don’t qualify for benefits at all under standard eligibility rules.
Eligibility Rules and Waiting Periods
PEO benefits plans come with eligibility requirements—typically full-time status and a waiting period before coverage starts. For construction companies with variable work schedules and project-based employment, these rules can create gaps. A laborer who works 50 hours one week and 20 the next might not meet the full-time threshold consistently.
Negotiate flexibility in how eligibility is calculated. Some PEOs will work with you to define full-time based on hours over a measurement period rather than week-to-week status. Others offer tiered plans where field workers can access basic coverage without meeting the same requirements as office staff.
Union Trust Fund Coordination
If you have union employees, their benefits typically flow through union trust funds, not your company plan. The PEO needs to handle the required contributions accurately and on time—these aren’t optional, and mistakes create serious problems with the unions.
Verify that the PEO’s payroll system can track and remit trust fund contributions by union, by classification, and by project if needed. Ask how they handle reporting requirements and whether they’ve worked with the specific unions you deal with. A PEO with no union experience will struggle with this, and the burden falls back on you to clean up the mess. Proper benefits administration outsourcing should simplify this process, not complicate it.
6. Model the True Cost Against Your Current Burden Rate
PEO pricing looks simple on the surface—usually a percentage of payroll or a per-employee-per-month fee. But the real question is whether that cost is better or worse than what you’re paying now when you account for everything: payroll taxes, workers’ comp, health insurance, retirement plan administration, HR software, and the internal time your team spends managing all of it.
Construction companies typically carry labor burden rates between 35% and 50% of gross wages, depending on workers’ comp costs and benefits offerings. Before you can evaluate a PEO proposal, you need to know your current burden rate with precision.
Calculate Your Fully Loaded Labor Cost
Start with gross payroll for a typical month. Add payroll taxes—FICA, federal unemployment, state unemployment in every state where you operate. Add workers’ comp premiums. Add health insurance costs, retirement contributions, and any other benefits you provide. Add the cost of your payroll software, HR staff time, and any outside consultants you use for compliance or benefits administration.
Divide that total by your gross payroll. That percentage is your current burden rate. Now compare it to what the PEO is quoting. If they’re proposing 8% of payroll but your current burden is 42%, you need to understand what’s included in that 8% and what you’re still paying separately. A detailed PEO cost forecasting guide can help you model these scenarios accurately.
Hidden Costs and Add-Ons
PEO pricing often excludes certain items that get billed separately. Workers’ comp may be quoted at cost-plus, meaning you pay the actual premium plus an administrative fee. Benefits may require employee contributions that aren’t reflected in the per-employee rate. Certified payroll, multi-state tax filings, or union reporting might carry additional charges.
Ask for a complete cost breakdown that shows every fee, every add-on, and every scenario where you’d pay more than the base rate. Run the numbers for a full year, including your busy season when headcount spikes and your slow season when it drops. Make sure the pricing structure works in both scenarios.
7. Plan the Exit Before You Sign
PEO contracts typically run one to three years, with auto-renewal clauses that extend the term unless you provide notice within a specific window. If you don’t plan your exit strategy before you sign, you can get locked into a relationship that’s not working with no clean way out.
Termination terms matter as much as pricing. What’s the notice period—30 days, 60 days, 90 days? Can you terminate mid-contract if the service isn’t meeting expectations, or are you stuck until the renewal date? What are the financial penalties for early termination?
Workers’ Comp Policy Portability
When you leave a PEO, your workers’ comp coverage ends with them. You need to secure new coverage immediately, and your loss history under the PEO affects your ability to get competitive quotes. Some PEOs make it difficult to obtain your loss runs and claims data in a timely manner, which delays your ability to get new coverage in place.
Clarify in the contract that you have the right to your workers’ comp data, including detailed loss runs, open claims information, and any safety documentation that affects your risk profile. You want this deliverable within 15 days of providing termination notice, not 90 days after your coverage ends.
Data Ownership and System Access
Your payroll records, employee files, benefits enrollment data, and time tracking history all live in the PEO’s system. When you leave, you need all of that data in a usable format so you can transition to a new provider or bring HR back in-house.
Most PEOs will provide data exports, but the format and completeness vary. Some give you raw data dumps that require significant cleanup. Others provide structured files that import cleanly into other systems. If you’re considering PEO integration with an HRIS platform, negotiate the data export format upfront and include it in the contract. You don’t want to discover after you’ve given notice that your historical payroll data is trapped in a proprietary format you can’t use.
Moving Forward with Confidence
Selecting a construction PEO at 100 employees isn’t about finding the cheapest per-employee rate—it’s about finding a partner that understands prevailing wage complexities, can handle your workers’ comp exposure without flinching, and won’t create operational friction for your project managers.
Start with your mod rate audit so you know where you stand on workers’ comp. Get clear on your multi-state footprint and certified payroll requirements so you’re not stuck with a PEO that can’t handle your operational reality. Run the real numbers against your current burden rate—if the math doesn’t work, the relationship won’t either.
If the economics make sense and the operational fit is there, a PEO can genuinely reduce your administrative load and improve your risk profile. If it doesn’t, you’re better off knowing that before you sign a multi-year agreement that’s difficult to exit.
Before you sign that PEO renewal, make sure you’re not leaving money on the table. Many businesses unknowingly overpay because of bundled fees, hidden administrative markups, and contracts designed to limit flexibility. We give you a clear, side-by-side breakdown of pricing, services, and contract terms—so you can see exactly what you’re paying for and choose the option that truly fits your business. Don’t auto-renew. Make an informed, confident decision.
