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Best Cost-Effective Recruitment Solutions, Compared by Hiring Volume
Hiring costs rise with every hire. The cheapest option at five hires is rarely the cheapest at fifty.
In short: an agency costs the least for one annual hire. RaaS leads at 5 and 15 hires. RPO (recruitment process outsourcing) has the lowest visible cost from 30 hires and becomes the strongest overall fit from 50.
*Serendi provides Recruitment as a Service and RPO, which appear in this comparison. We assessed other models based on public information checked in late 2026.
Most Cost-Effective Recruitment Solutions: In Short
RaaS is the most affordable recruitment solution for volumes from 5 to 15 hires. At 30 hires, the 8% RPO scenario produces the lowest visible cost. From 50 hires, RPO solutions remain the lowest-cost option.
Recruitment model | 5 hires | 15 hires | 30 hires | 80 hires | 150 hires |
|---|---|---|---|---|---|
Contingency agency | €65,000 €13,000/hire | €195,000 €13,000/hire | €390,000 €13,000/hire | €1,040,000 €13,000/hire | €1,950,000 €13,000/hire |
RaaS (Serendi Flex) | €46,500 €9,300/hire | €133,500 €8,900/hire | €267,000 €8,900/hire | Outside standard scope | Outside standard scope |
In-house + agencies (30%) | €179,500 €35,900/hire | €218,500 €14,567/hire | €277,000 €9,233/hire | €472,000 €5,900/hire | €905,000 €6,033/hire |
Recruitment Process Outsourcing (RPO) | Usually unsuitable | Rarely used below 30 | €156,000 €5,200/hire | €416,000 €5,200/hire | €780,000 €5,200/hire |
Lowest-cost option | RaaS | RaaS | RPO | RPO | RPO |
*RaaS calculations use the appropriate package or package combination for each hiring volume.
How We Compared the Cost of Each Recruitment Solution
Visible cost per hire means recruitment fees, recruiter salaries, tools, and job advertising divided by completed hires.
To compare cost-effective recruiting solutions, we use an annual salary of €65,000 for every hire. To make the calculation less complicated, we use the same figure for total compensation (TC).
Recruitment model | Cost used in the comparison |
|---|---|
Contingency agency | €13,000 per hire (20% of salary) |
RaaS (Serendi Flex) | Package fee + €7,600 per hire |
In-house team + agencies | €160,000 per team per year, plus €13,000 for each agency hire |
Full RPO | €5,200 per hire (8% of salary) in the 30-hire and 50+ scenarios |
Internal-team assumptions:
Agencies fill 30% of roles; the internal team handles the rest. We assume each two-recruiter team can fill 56 roles annually, or 28 per recruiter.
The €160,000 covers two recruiters, ATS and software, job ads, recruitment marketing, referral bonuses, events and travel.
Recruitment as a Service costs use the lowest-cost suitable combination of Serendi’s published packages.
Full RPO is modelled at 8% of salary, the midpoint of Serendi's published 7% to 9% range.
Hiring-manager time, vacancy days and unsuccessful hires are excluded. These hidden costs of recruitment can raise spending beyond the figures shown, including for low-volume internal teams and agency-heavy hiring. The RPO cost vs in-house recruitment article includes a broader total-cost model.
Another important thing is the service scope. In other words, what you get for the invoiced amount. RaaS, agencies, and RPO comparison explains the delivery differences behind the fees.
The Most Cost-Effective Recruitment Solutions in Detail
1. Contingency Agency: Lowest Cost for a Single Hire
The fee rises with every hire and every euro of salary. There is no permanent recruitment team to fund, but repeated placements keep adding percentage fees.
Published market benchmarks show the variation:
Market | Contingency agency fee | Source |
|---|---|---|
Germany | 15% to 25% of annual gross salary | Mission Personal |
Netherlands | Around 25% of annual gross salary, with a 20% to 35% range | YoungCapital |
United Kingdom | 15% to 20% of first-year salary; 20% to 25% for senior or hard-to-fill roles | Recruitly |
United States, US data | 15% to 25% of first-year base salary | RecruitBPM |
Best for: One urgent or specialist hire a year.
Visible cost: At €65,000 and a 20% fee, €13,000 per hire at every volume. For a single hire, this beats the smallest Recruitment as a Service package at €16,100: €8,500 plus a €7,600 closing fee.
Where the cost rises: Repeating that purchase across a growing hiring plan. At 30 hires, agency fees total €390,000, compared with €267,000 for RaaS under this model.
So, a recruitment agency is a viable and cost-effective option when you need it only occasionally. Those high fees become harder to justify when placements become routine.
2. Recruitment As a Service: Lowest Cost From the Second Hire to About 30
Recruitment as a Service (RaaS), also called a recruitment subscription, provides recruiting capacity through a productized recruitment package. With Serendi Flex, the package includes a dedicated Talent Acquisition Partner and role intake credits covering structured intake, talent sourcing, human candidate screening and a shortlist of at least three vetted candidates. A published closing fee applies only when a candidate is hired.
Best for: Several hires in a defined period, including growing companies assessing startup hiring solutions on a budget.
Visible cost: Recruitment as a Service combines a package fee with a closing fee for each successful hire. Its published packages are:
Package | Fee | Intake credits | Window to start searches |
|---|---|---|---|
Start | €8,500 | 7 | 2 months |
Grow | €19,500 | 15 | 4 months |
Scale | €36,500 | 25 | 6 months |
The closing fee depends on total compensation:
Total compensation | Closing fee per hire |
|---|---|
€40,000 to €60,000 | €4,700 |
€60,001 to €90,000 | €7,600 |
€90,001 to €120,000 | €10,300 |
Above €120,000 | €13,000 |
At €65,000, the €7,600 closing fee applies. From the second hire, RaaS costs less than the model's 20% agency fee, provided searches fit the purchased window.
For a single fully used package at this salary, cost per hire is about €8,814 on Start, €8,900 on Grow and €9,060 on Scale. At five hires on Start, the figure is €9,300 because some credits remain unused.
Smaller hiring plans can cost more per hire. At two hires, Start totals €23,700, or €11,850 per hire, which still costs less than the agency's €13,000 per hire.
“A subscription changes the design. The work is paid for up front. A difficult search is already funded, so the recruiter stays with it instead of leaving for a faster win. Your niche role gets the same effort as your obvious one.”
Julia Koblischke, Head of Talent Solutions, Serendi
Where the cost rises: Underused credits, additional subscription periods and higher compensation bands. Each credit starts one search, which continues until the hire is made, even beyond the package window.
Unused credits roll over while the subscription remains active. Cancellation requires 30 days' written notice; the Recruitment as a Service pricing guide explains the terms.
3. In-House Team: Pays Off From Around 32 Steady Hires a Year in This Model
The team costs the same when hiring slows, so spending is spread across fewer completed hires. At five annual hires, the model's internal setup costs €35,900 per hire.
Best for: Steady, predictable hiring in one market and language, with enough work to keep the team occupied.
Visible cost: €160,000 per team unit annually, plus agency fees for 30% of hires. An internal team becomes cheaper than RaaS from around 32 steady hires under these assumptions.
Near the crossover, small changes can reverse the result. At 32 annual hires, the model gives €284,800 internally against €285,700 for RaaS, a gap of €900. The exact crossover depends on the actual number of agency placements and which Flex packages are available.
The lowest internal figure in the main comparison is €5,900 per hire at 80 hires. It rises to €6,033 at 150 because another team unit is required.
Where the cost rises: Partly unused capacity, additional team units, and continued agency spending. At 50 and 100 hires, the model costs €7,100 per hire.
The exception matters: a fully used team delivering 56 hires without agencies costs about €2,857 per hire, calculated as €160,000 divided by 56. That is cheaper than the RPO figure.
4. RPO: Lowest Cost Per Hire From 50 Hires a Year
RPO can support 15 or 30 hires, but a full RPO engagement may provide more capacity and process depth than those volumes can use. Full RPO also requires commitment, typically 12+ months, and four to eight weeks of setup.
Best for: At least 50 annual hires, changing demand, or recruitment across several countries.
Visible cost: €5,200 per hire at 8% of €65,000 TC, with all hires handled by the RPO partner and no additional agency fees.
*Note: We used Serendi’s prices, not a market average. The percentage is a midpoint of Serendi's published 7% to 9% range.
At 30 hires, that rate produces an annual visible cost of €156,000, the lowest number in the row.
Where the cost rises: Contracted commitments, setup requirements and the scope agreed with the provider. The model assumes the 8% fee covers the compared recruitment service; an actual proposal needs the same scope check.
Full RPO has the lowest visible cost from 50 annual hires in this comparison and covers all hiring without additional agency fees. The internal-team scenario includes agency fees for 30% of hires.
For employers comparing cost-effective staffing solutions across Europe, RPO solutions provide several delivery options. Project RPO suits a defined assignment; on-demand RPO, including embedded recruiters, addresses narrower capacity needs.
Both sit within RPO. The best RPO companies comparison covers provider fit once the delivery requirement is clear.
Freelance or fractional recruiters and vetted talent marketplaces are further options. Our recruitment agency alternatives comparison covers these options.
Which Cost-Effective Hiring Solution Fits Your Hiring Plan?
The best cost-effective hiring solutions match volume, timing, and the work your own team can deliver.
◉ If You Hire Fewer Than Five People a Year
Comparing only direct, visible costs, for one hire at €65,000, the agency costs €13,000 against €16,100 for Start. RaaS becomes cheaper from the second hire when searches fit the package window. At five hires, it costs €9,300 per hire against the agency's €13,000.
◉ If You Are a Startup Hiring On a Budget
Comparing only direct (visible) costs, an internal setup costs €35,900 per hire at five hires in this model. RaaS provides recruitment capacity without funding a permanent in-house team. Budget recruitment solutions still need a realistic forecast: unused package capacity increases the amount paid per completed hire.
◉ If You Hire 20 to 50 People a Year Across Europe
With only direct costs calculated, RaaS leads at the lower end of this range in the model. Among the RaaS and in-house options, an in-house team can pay off around 32 hires when demand is steady and concentrated in one market and language. A tailored RPO quote can change that comparison. At 50 hires, full RPO is the most cost-effective recruitment solution.
◉ If You Need Extra Recruiting Capacity for Six Months
If you need extra recruiting capacity for six months, RaaS can cover a defined number of searches without adding permanent headcount. Choose on-demand or project RPO when recruiters need to work within your ATS, represent your employer brand or manage more of the recruitment process. Compare both options using the same roles, period and service scope.
◉ If You Hire 100 or More People a Year
With only direct (visible) costs calculated, at 100 annual hires, RPO costs €520,000, compared with €710,000 for the in-house model with agencies filling 30% of roles. At 150 hires, the comparison is €780,000 for RPO versus €905,000 for the in-house model. An internal team can cost less only if it fills all roles without agency support and uses most of its available capacity.
What Changes When You Hire Across Several European Countries?
Agency percentages differ by country, and salaries change the amount behind the percentage. Affordable recruitment solutions in one market can produce a different bill elsewhere.
Eurostat's 2024 average annual full-time adjusted salary was €39,800 across the EU, according to data reported by Euronews. Luxembourg was highest at €82,969; Bulgaria was lowest at €15,387. At a 20% agency fee, those salaries imply about €7,960, €16,594 and €3,077 per hire, respectively.
Agency and RPO fees rise or fall with salary, while Serendi’s Recruitment as a Service model combines a fixed package fee with a banded closing fee. The lowest-cost option at €65,000 may therefore differ in a lower-salary market. For salaries below €40,000, confirm the applicable Flex closing fee before running the comparison.
Run the comparison per market before combining the budget. One partner across countries reduces the number of suppliers to manage; RPO for Europe covers that delivery approach.
Our cost-effective hiring strategies guide addresses improvements within the recruitment process after the model is chosen.
Conclusion: Choose by Hiring Volume
The comparison gives a starting point for your hiring budget:
One hire a year: A specialist agency.
Two to lower-volume hiring plans: RaaS, with searches fitting the purchased package windows.
At 30 hires: RPO has the lowest visible cost if the 8% rate applies.
Around 32 to 49 steady hires in one market: An in-house team can beat RaaS; compare it with a tailored RPO quote.
50 or more hires: Full RPO covers all hiring without additional agency fees and has the lowest visible cost in this model.
A fully occupied internal team with no agency use remains the cheaper exception. Choose against the hiring plan you can realistically deliver, including the months when recruitment slows.
Not sure which model fits your hiring volume?
Frequently Asked Questions
What Is the Most Cost-Effective Recruitment Solution?
When comparing only direct costs, in a €65,000 salary model, an agency leads for one hire, and RaaS leads across lower-volume plans. At 30 hires, the 8% RPO scenario has the lowest visible cost at €156,000. From 50 hires, RPO is both the cost leader and the stronger fit.
Is RPO Cheaper Than a Recruitment Agency?
Yes. For the same hiring volume, salary, and service scope, RPO is cheaper than agencies. RPO has an average commission rate of 8%, compared with a 20% contingency agency fee.
What Is the Cheapest Way for a Startup to Hire?
For outsourced recruitment at €65,000 salaries, this model favours an agency for one hire and RaaS from the second hire. At five hires, RaaS costs €9,300 per hire against €35,900 for the internal setup.
Sources
Mission Personal, Personalvermittlung für Arbeitnehmer.
YoungCapital, Kosten werving en selectie.
Recruitly, Recruitment agency fees 2026.
RecruitBPM, Recruitment fees. US data.
Eurostat 2024 salary data, reported by Euronews, EU salaries surge by 5.2% in 2024, 13 November 2025.
