When a PEO proposal lands on your desk, it usually arrives as a single monthly number. Maybe there’s a brief summary page, a few benefit plan options, and a signature block. What it rarely includes is a clear explanation of how that number was built, what’s driving it, and whether it’s reasonable for a firm like yours.
For architecture firm principals and HR leaders, this opacity is genuinely frustrating. You spend your professional life breaking project costs into detailed line items: consultant fees, reimbursables, construction administration hours, and contingency. You know that a single lump-sum number without a breakdown is not a number you can evaluate. PEO pricing works the same way, but most vendors don’t present it that way.
The goal of this article is not to hand you a vendor list or a benchmark price range. It’s to give you the diagnostic framework to read a PEO proposal rather than just receive one. That means understanding the fee structures PEOs use, the factors specific to architecture firms that push costs up or down, what the base fee actually covers, and how to structure a comparison that reflects your firm’s real situation.
The Two Fee Models Every Architecture Firm Will Encounter
PEO pricing generally follows one of two structures, and understanding the difference before you request quotes will save you a significant amount of confusion when proposals arrive.
Percentage-of-payroll pricing: The PEO charges a fee calculated as a percentage of your firm’s total gross payroll. The practical implication is that the fee scales directly with your compensation levels. For architecture firms, where licensed architects, senior project managers, and principals often earn well above median salaries, this model can produce a higher fee than firms in industries with lower average compensation. A firm with several principals earning substantial salaries will pay more under this model than a firm of the same headcount with a flatter pay structure, even if the services delivered are identical.
Per-employee-per-month (PEPM) pricing: The PEO charges a flat fee for each enrolled employee, regardless of what that employee earns. For firms with a wide compensation spread, this model behaves very differently. A principal earning significantly more than a junior drafter costs the same flat fee under PEPM. Depending on your firm’s specific mix of roles and salaries, this structure may produce a materially different total cost than a percentage-of-payroll quote from the same or a competing vendor.
Neither model is inherently better. The one that costs less depends on your firm’s compensation distribution. A firm with a concentration of high earners at the top and moderate salaries across the rest of the staff might find PEPM more predictable and less expensive. A firm with a relatively flat pay structure across all levels might find the opposite. The only way to know is to run both calculations against your actual payroll data.
The complication is that many PEOs don’t make this easy. Some vendors blend both approaches or quote an all-in rate that bundles the administration fee together with workers’ compensation costs and benefits premiums into a single number. When a quote is presented this way, direct comparison against other proposals becomes genuinely difficult. You can’t tell whether a lower all-in rate reflects a better administration fee, a cheaper workers’ comp arrangement, or simply a different benefits plan structure.
This is why unbundling the quote is the first step in evaluating any PEO proposal. If a vendor presents only a combined number, ask them to separate the components before you do any further analysis. A vendor that won’t break out the administration fee, workers’ comp cost, and benefits premiums separately is making it harder for you to make an informed comparison, which is not in your interest.
Architecture-Specific Cost Drivers Your Quote Reflects
PEO pricing is not one-size-fits-all, and architecture firms have several characteristics that directly influence what a PEO will charge. Understanding these before you sit down with a vendor puts you in a much stronger position to evaluate whether a quote is reasonable.
Workers’ compensation class codes: Architecture and engineering office staff typically fall under relatively low-risk workers’ comp class codes, which is a meaningful cost advantage compared to trades or construction. However, firms that employ staff in construction administration, site observation, or field inspection roles may find those employees classified under different codes with higher associated rates. The mix of office-based versus field-based roles in your firm directly affects the workers’ comp component of the PEO fee.
This matters in practice because class code assignments are not always accurate in initial proposals. A PEO may classify a construction administration architect under an office code based on their job title rather than their actual duties. That might seem like it saves money upfront, but it creates exposure at year-end audit when the actual work performed doesn’t match the classification. Conversely, some PEOs may over-classify field-adjacent roles, resulting in you paying more than necessary. Verifying that the codes in the proposal match how your staff actually spends their time is not a minor detail.
Professional liability versus EPLI: Architecture firms carry professional liability (errors and omissions) insurance as a core business requirement, and PEOs do not cover this. It remains entirely your firm’s responsibility and should not be expected to appear in a PEO arrangement. This distinction is worth confirming explicitly, because some PEOs describe their risk management services in broad terms that could be misread as including E&O coverage.
Employment Practices Liability Insurance, or EPLI, is a different matter. EPLI covers claims related to employment decisions such as wrongful termination, discrimination, or harassment allegations. It is often included or available through the PEO’s group arrangement, and the cost within the PEO can be influenced by your firm’s size, claims history, and the states where you operate. If your firm has had employment-related claims in recent years, this is worth discussing directly with any PEO you’re evaluating.
Compensation concentration among principals: Under a percentage-of-payroll model, a firm where several principals earn high salaries will pay noticeably more than a firm with the same headcount but a more distributed compensation structure. This is a legitimate negotiating point. If your firm’s payroll is heavily weighted toward a small number of highly compensated individuals, it’s worth asking whether a PEPM structure would produce a lower total cost, and whether the vendor offers that option.
Multi-state operations: Architecture firms frequently have staff licensed in multiple states, employees traveling for project work, or remote employees based in states where the firm doesn’t have a physical office. Each of these situations creates employment law complexity: different paid leave requirements, unemployment insurance accounts, withholding rules, and in some cases, state-specific professional licensing employment rules. PEOs that operate across multiple states can address much of this, but the complexity also affects pricing. Firms with a multi-state footprint should expect this to be reflected in the quote and should ask specifically how the PEO handles compliance in each state where they have employees.
What the Base Fee Covers and What It Doesn’t
The administration fee is the core of what you’re paying the PEO for its services. Understanding what it includes, and what it doesn’t, prevents the kind of surprise that shows up in month three when an invoice line item appears that wasn’t in the original conversation.
The PEO administration fee typically covers payroll processing, federal and state tax filing, HR support and guidance, access to the PEO’s compliance resources, and enrollment in the PEO’s master workers’ compensation policy. For firms that currently manage these functions across multiple vendors or internally, this consolidation has real operational value. But the administration fee does not automatically include benefits premiums.
Benefits costs are often the largest single component of total PEO spend, and they are frequently quoted separately from the administration fee. This is where architecture firms need to apply careful scrutiny. The relevant question is not just what the benefits cost through the PEO, but whether those rates are genuinely competitive against what your firm could obtain independently. For licensed architects, engineers, and senior project managers who have market-level expectations around medical coverage, plan design and network access matter as much as the premium amount. A lower premium that comes with a narrower network or higher out-of-pocket costs may not represent better value for your staff.
Some PEOs pass benefits premiums through at their actual cost; others mark them up. Asking directly how the PEO structures benefits pricing is a reasonable question, and the answer should be clear. If a vendor is vague about whether any markup applies to benefits costs, that’s worth pressing on before you sign anything.
Beyond the administration fee and benefits, there are one-time and periodic fees that don’t always appear prominently in initial proposals:
Implementation or onboarding fees: Some PEOs charge a setup fee to onboard your firm, configure payroll, and enroll employees. These can vary considerably and are sometimes negotiable, particularly if you’re bringing a larger employee group or signing a multi-year agreement.
Annual open enrollment administration fees: Managing benefits open enrollment for your employees takes real effort, and some PEOs charge separately for this each year. Ask whether it’s included or billed as an additional fee.
Offboarding or termination fees: If your firm decides to exit the PEO arrangement before a contract term ends, some vendors charge a termination fee. This is not always disclosed prominently in the initial proposal, and it’s worth understanding before you commit to a multi-year agreement.
The Real Cost Comparison: PEO Versus Managing HR In-House
A common mistake in evaluating PEO pricing is comparing the PEO fee against only what you currently pay a payroll vendor. That’s an incomplete comparison. The relevant baseline is the full loaded cost of managing HR functions internally, which includes more than most firms initially account for.
A realistic in-house cost baseline should include the time cost of internal staff who handle HR, payroll, and compliance tasks, even if HR is not their primary role. In many architecture firms, this work falls on an office manager, a principal, or a part-time HR resource. That time has a real cost even when it doesn’t appear as a separate line item. Add to that any standalone HR software subscriptions, your current workers’ compensation premiums, and any fees paid to outside counsel or HR consultants for compliance guidance, and the actual cost of managing these functions in-house is often higher than the simple payroll vendor fee suggests.
Architecture firms that are growing, adding employees in new states, or navigating the complexity of multi-state licensing and employment law often find that the compliance support included in a PEO arrangement has real value that a simple fee comparison doesn’t capture. A PEO that handles state tax registrations, unemployment accounts, and paid leave compliance across multiple states can prevent the kind of errors that generate penalties and legal exposure. That said, this value depends heavily on how well the specific PEO actually delivers on its compliance support, which is a service quality question as much as a pricing question.
On the other side, firms that are stable, single-state, and already running efficient HR operations may find that a PEO fee adds cost without a proportional benefit. If your firm has a dedicated HR professional, established vendor relationships, and a workers’ comp policy with favorable rates, the PEO’s bundled offering may not improve on what you already have. The honest answer is that the value calculation is specific to each firm’s situation, which is why comparing multiple PEO proposals against a realistic in-house cost baseline, rather than just against each other, produces a more useful decision.
Reading a PEO Proposal Without Getting Lost in the Numbers
Once proposals arrive, the way you read them matters as much as the numbers themselves. A few specific practices will help you evaluate what you’re actually looking at.
Request an unbundled quote from every vendor. Ask each PEO to provide a breakdown that separates the administration fee, workers’ comp cost, benefits premiums, and any pass-through taxes or fees as distinct line items. A proposal that presents only a single all-in number cannot be compared fairly against other proposals or against your current costs. Any vendor unwilling to provide this breakdown is making evaluation harder than it needs to be, and that itself is useful information.
Verify the workers’ comp class codes. Ask each PEO to identify the class codes they’re using for your employees and confirm that those codes match how your staff actually works. If you have architects or project managers who regularly perform construction administration site visits, confirm how those roles are classified. Misclassified employees can result in either overpaying now or facing an audit adjustment at year-end when actual payroll data is reconciled against the policy. Either outcome is avoidable with a direct conversation upfront.
Ask about renewal rate history and what triggers fee increases. PEO pricing is not static. Administration fees can increase at annual renewal, and benefits costs typically adjust based on claims experience and market conditions. Before signing a multi-year agreement, ask the vendor what their renewal rate history looks like and what contractual protections, if any, exist against significant fee increases after the first year. A vendor with a consistent and reasonable renewal history is a different risk profile than one that quotes aggressively to win the business and adjusts sharply at renewal.
Confirm the CPEO status of any vendor you’re seriously considering. The IRS certifies certain PEOs as Certified Professional Employer Organizations (CPEOs) under IRS Revenue Procedure 2016-33 and subsequent guidance. CPEO status carries specific federal tax administration responsibilities and provides certain protections related to tax liability. It’s not the only factor in evaluating a PEO, but it’s a meaningful distinction that’s worth confirming directly with any vendor under serious consideration.
Building a Comparison That Holds Up
Comparing PEO proposals effectively requires a consistent framework. Without one, the lowest-quoted number may not reflect the lowest actual cost, and the differences between proposals can obscure rather than reveal the right choice.
Start by establishing a common basis for comparison across all proposals: the same employee count, the same payroll figures, the same benefits plan tier, and the same workers’ comp class code assumptions. When vendors quote against different assumptions, their numbers aren’t directly comparable. Establishing a shared baseline before you request proposals, rather than after they arrive, produces cleaner comparisons and gives vendors less room to structure quotes in ways that obscure true cost.
Price is one dimension. Service quality is another, and for architecture firms it deserves real weight. The difference between a dedicated HR contact who understands professional services firms and a generalist call center model becomes apparent when you have an urgent compliance question or an employment situation that needs careful handling. Ask each vendor specifically about their support model: how HR support is accessed, what response time commitments they make, and whether your firm would have a named contact or work with a rotating team.
Technology platform capabilities also vary meaningfully across PEOs. For firms managing project-based time tracking, multi-state payroll, or frequent onboarding of project staff, the quality of the PEO’s platform affects day-to-day operations in ways that don’t show up in a fee comparison but matter in practice.
A structured comparison process, whether done internally with a consistent evaluation template or with outside guidance, tends to produce better outcomes than reviewing proposals sequentially and letting the most recent vendor conversation set the frame for the decision. Anchoring to the last proposal you reviewed is a natural tendency, but it’s not a reliable way to find the right fit.
Putting It All Together
Architecture firm PEO pricing is not a single number. It’s a bundle of components: an administration fee, a workers’ comp cost, benefits premiums, and various one-time or periodic charges, each of which behaves differently depending on your firm’s size, compensation structure, role mix, and operational footprint.
The goal is not to find the lowest quoted fee. It’s to understand what you’re actually buying and whether the total cost, across all components, is competitive and appropriate for what your firm needs. A lower administration fee paired with uncompetitive benefits rates or misclassified workers’ comp codes may cost more in practice than a higher headline fee from a vendor who gets the details right.
Firms that approach PEO evaluation with this framework, unbundling quotes, verifying class codes, comparing against a realistic in-house baseline, and evaluating service quality alongside price, tend to make decisions they’re confident in rather than ones they revisit a year later at renewal.
If you’re evaluating PEO proposals and want a structured way to compare them side by side, PEOMetrics provides an unbiased comparison service that separates pricing components, surfaces the details that matter for firms like yours, and helps you see what you’re actually paying for across multiple vendors. Don’t auto-renew. Make an informed, confident decision.
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