Use one agency for senior or specialised searches where depth matters, and consider two for volume or hard-to-fill roles where reach is the constraint. Beyond two, effort per agency drops, candidates receive duplicate approaches and your brand suffers. Whatever you choose, write down the introduction and credit rules before any profile arrives.
Incentives. On a contingent basis, an agency is paid only if their candidate is hired, so several agencies on one role means each is racing and each rationally invests less. You tend to receive speed and volume rather than depth: profiles that were already on their desk, sent quickly, rather than a search run for your specification. That trade can be acceptable when reach is the binding constraint. It is a poor trade for a senior role where the work is mapping a market and persuading people who are not looking. Exclusivity, whether informal or contractual through a retained arrangement, is what buys that deeper effort. Decide which of those two you are buying before you decide how many firms to involve.
Three, and they compound. Duplicate approaches, where the same candidate is contacted by three recruiters about one job, which makes your company look disorganised and can put good people off entirely. Ownership disputes, since two agencies claiming the same introduction is common and the argument arrives exactly when you want to make an offer. And your own workload, because each agency needs briefing, feedback and management, so three agencies can consume more recruiter time than running the search internally would have. Add a fourth risk over time: a market where every candidate has heard about your role from multiple sources develops the impression that you cannot fill it. None of these risks is hypothetical, and each is cheaper to prevent than to unwind.
Write the rules first and apply them without exception. Introductions are credited to whoever submitted first, evidenced by a timestamped record in your system, with a defined validity period. Any candidate already in your database is yours, which is why your own sourcing must be logged with dates. Cap the number of agencies at two or three and tell each how many are involved, since finding out later damages trust. Give identical briefs and identical feedback. Set a shared deadline for the first shortlist. Agencies track submissions in their own [recruitment agency software](/recruitment-agency-software), so keep every submitted profile in your own [applicant tracking system](/ats) with the source and date recorded automatically rather than in email, because email is where ownership disputes become unresolvable.
When the search requires real work rather than a database query. Executive and specialised roles qualify, as do confidential replacements and first hires in a new market. In exchange for exclusivity you should ask for more: a defined search plan, a market map, regular updates, agreed milestones and a named consultant rather than whoever is available. Retained arrangements, where part of the fee is paid up front, formalise that commitment and give you a claim on the effort. Give exclusivity a time limit, typically a few weeks, with a clear review. An open-ended exclusive with no milestones gives away your only leverage and is the most common way these arrangements go wrong.
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