Yes, there is a preferred way — and it is not a list of logos on an agency's website. A permanent placement is a one-time, high-consequence purchase, so evaluate the firm the way you would evaluate any supplier you get one attempt with: on how they are paid, what they guarantee, and the quality of what they actually send you. Firm size, years in business and award badges matter only insofar as they change those three things.
That framing matters because most employers evaluate permanent search firms the same way they evaluate contract staffing suppliers. The two are different services with different economics, and judging one by the other's criteria is how employers end up paying a full fee for a hire that leaves in month four.
Permanent search is a different purchase from contract staffing
Contract and temp-to-hire work is an ongoing relationship. You judge the supplier on fill speed, coverage, and how quickly they replace someone who does not work out — and the relationship continues, so a bad week can be corrected.
Permanent placement is a single transaction with a long tail. You pay once, you hire once, and the cost of getting it wrong is not a replacement shift but a vacancy you have to refill from scratch. The agency is paid on the placement, which aligns incentives on one axis and creates pressure on another: a contingent fee rewards closure, not fit.
So the question is never "which agency is the best in Chicago." It is "which fee model, guarantee and screening process fits this role" — and then whether a given firm can evidence all three.
Start with the fee model, because it predicts behaviour
There are three structures you will meet, and each behaves differently under pressure.
- Contingency. A percentage of the new hire's first-year base salary, payable when the candidate starts. No hire, no fee. Usually non-exclusive, which means the agency knows it may be competing with two or three other firms for the same fee — and that shapes what it is willing to invest in the search.
- Retained or engaged search. A staged fee, commonly split across kickoff, shortlist and start. Higher total cost, but it buys dedicated researcher time and a firm that is not hedging against your other suppliers. Standard for senior, confidential or genuinely scarce roles.
- Flat fee or capped fee. A fixed amount per role, sometimes with a cap on the percentage. Predictable budgeting, and useful when you are filling the same kind of role repeatedly.
The questions that expose whether the model is being used honestly are short:
- Is this search exclusive, and does the fee change if it is?
- What exactly is included — advertising, screening, assessment, reference checks, or only sourcing?
- What is the off-limits window? If the same candidate approaches you directly three months later, what do you owe?
- Does the fee step down on repeat hires in the same role family?
A firm that answers these in writing, without hedging, is telling you something useful about how it will behave when the search gets difficult.
The guarantee is the real specification
Every permanent placement firm advertises a guarantee. Very few describe one precisely, and the difference between them is where most disputes start.
Four things define what you are actually getting:
- Replacement or refund. A replacement search costs you time; a refund costs the agency money. Both are legitimate, but they are not equivalent and you should know which one you are owed.
- The window. Thirty, sixty or ninety days are all common. What matters is whether the window matches your own probation period and onboarding reality — a ninety-day guarantee means little if your review point is at six months.
- What voids it. Resignation is usually covered. Being let go for performance, a restructure, or a change in the role often is not. Read that clause before you sign, not after a hire fails.
- Whether the clock restarts. If the first replacement also leaves, does the guarantee cover them? A guarantee that only ever applies once is a weaker product than it looks.
Ask for the guarantee text as a document, not a verbal summary. If it cannot be produced before the contract, that is the answer.
Judge submittals, not resume volume
A permanent search firm earns its fee in the first three candidates. After that, you are mostly managing a process it should already have de-risked.
The useful test is what arrives with each candidate. A submittal worth the fee includes a written rationale: why this person fits the specific requirements you agreed, what they are currently doing and why they are open, what they want next, and their salary expectation with evidence of where that number came from. It should also tell you what they did not match — a shortlist where every candidate clears every requirement is usually a shortlist where nobody was asked hard questions.
Volume is not a quality signal. Forty CVs forwarded without commentary is not work you are paying for; it is work you are doing. Five candidates, each with a reason and a risk noted, is the product.
Test the firm on one role before you commit
The cheapest way to evaluate a permanent search partner is to give them exactly one search with sharp edges.
Write down the must-haves, the nice-to-haves, the salary band and the interview loop. Agree a shortlist date, a weekly check-in cadence, and one named contact. Then watch three things: did they ask the questions that actually determine fit, did they push back on anything unrealistic in your brief, and did the shortlist arrive when they said it would.
A firm that agrees to everything in the kickoff call without challenging any of it is not being agreeable. It is deferring the difficult conversation to the point where you have already spent the fee.
Questions worth asking on the first call
- What proportion of your placements are still in the role a year after they start, and how do you know?
- Walk me through your best and worst placement in the last year.
- Who does the actual work — the person I am speaking to, or a junior researcher after the contract is signed?
- How do you handle a gap between our salary band and what candidates are asking for?
- What is your process for reference checks, and do they happen before or after my interview?
- How do you prevent the same candidate being submitted by two agencies on the same fee?
- What do you need from me to deliver a shortlist in ten working days?
The answers are less important than the specificity. Vague answers to specific questions are the most reliable red flag in this market.
Red flags that are specific to permanent search
- A guarantee that covers resignation only, with no replacement search obligation.
- A fee percentage that moves after you disclose the salary band.
- No written rationale with submittals.
- Pressure to move to offer before references are complete.
- No questions about why people stay at your company, only about the role.
- No explanation of how they would represent you to a candidate who has two other offers.
A five-part scorecard
Score each 1–5 and write down the evidence, because the number is only as good as the reason behind it:
- Fee clarity — written, complete, with the off-limits terms stated.
- Guarantee strength — replacement or refund, window length, what voids it.
- Submittal quality — rationale, salary evidence, honest gaps.
- Market knowledge — can they tell you what the role pays in your specific part of the metro, and who else is hiring for it.
- Cadence — named contact, agreed check-in, shortlist date met.
Anything scoring three or below is the part of the search that will fail later. It is cheaper to fix it before kickoff than after a hire leaves.
What good looks like in the first two weeks
A solid permanent search has a recognisable shape early. A kickoff where the brief is written down and agreed rather than discussed verbally. Market feedback inside the first week, including the uncomfortable version — the band is low, the title is wrong, the hybrid expectation is cutting your pool. First submittals with reasoning attached. Interviews scheduled without you chasing anyone.
If those four things are not happening in a fortnight, the fee model or the firm is wrong for this role, and neither will improve with time.
The bottom line
Evaluate a permanent placement agency on the fee model, the guarantee text, the quality of its submittals and its willingness to tell you something you did not want to hear. Those four things predict the outcome far better than a client logo wall, because they describe how the firm behaves when the search is hard — which is precisely when you are paying for it.
If you would rather not run that evaluation cold, tell us about the role and a specialist recruiter will walk you through how the search would run, what the market is paying, and what we commit to in writing. For the broader comparison across agency types, our guide to choosing a staffing agency in Chicago covers the general checklist, and how hiring through an agency works walks the process end to end.