Hire an SDR when your AEs are already converting warm meetings into revenue and the only thing missing is more first meetings. Do not hire one to find out whether your offer sells, or to fix a conversion problem downstream. Before you open the role, do the cost-per-meeting arithmetic, and check whether equipping the sellers you already have would produce the same meetings for a fraction of the cost. Here is the decision framework we use with founders, and the math behind it.

What an SDR actually adds, and what they cannot fix

An SDR adds first meetings. That is the whole product. If the bottleneck in your funnel is first meetings, an SDR is the right hire. If the bottleneck is anywhere else, the SDR will amplify it.

• AEs who close one deal in ten first meetings will close one in ten SDR meetings, so you pay for nine wasted ones.
• A target that changes every month gives the SDR a new list every month and no learning curve.
• An offer nobody has sold yet gives the SDR a script nobody has tested.

Our rule: an SDR scales a method that works. They do not discover one.

Three questions before you open the role

1. Are your AEs short of meetings, or short of conversion?

Pull the last quarter. Count first meetings per AE per week and the share that became opportunities. If an AE runs fewer than five first meetings a week and converts more than a third of them, they are short of meetings. If they run ten and convert one in ten, they are short of conversion, and an SDR makes it worse.

2. Is the target stable?

Same persona, same segment, same core message for the last 90 days. If the founder changed the ICP twice this quarter, wait. The SDR's first month is spent learning who to call; if that answer moves, the month is lost.

3. Does the deal size carry the cost?

An SDR's loaded cost in France (fixed, variable, employer charges, tools, a slice of a manager's time) is a real number you should write down. Divide it by the meetings you expect per year. In our experience, below a few thousand euros of annual contract value the arithmetic rarely closes on outbound, and above a few tens of thousands it closes easily. In between, the answer depends on how many of those meetings your AEs convert.

The cost-per-meeting math, with the formula

Write it down before any interview.

1. Loaded annual cost = fixed + on-target variable + employer charges + tooling + 10% of a manager's cost.
2. Expected meetings per year = meetings held per month, after ramp, times the months after ramp. Be honest about ramp: three to six months in our experience.
3. Cost per meeting held = line 1 divided by line 2.
4. Cost per opportunity = cost per meeting divided by your AEs' meeting-to-opportunity rate.
5. Payback = cost per opportunity times deals needed, against gross margin per deal.

Then the stress test. What happens to line 2 if the SDR has 8 conversations a day instead of 20? With a manual dialer and the 11.3% average connect rate we measured on 1,000,000 French B2B cold calls, 8 is the realistic number. With parallel dialing, about 5x more conversations per hour, 20 is. Same salary, two and a half times the meetings. Tooling is the biggest variable in the formula and most founders leave it out.

The alternative: equip the sellers you already have

Before adding headcount, run the same math on the people already on payroll.

• Your AEs' unused hours. Most AEs in teams under ten already prospect, badly, in 30-minute gaps. Two protected 90-minute blocks at 10am and 4pm (14% and 15.8% connect in our benchmark, against 9.8% at 8am) on a parallel dialer produce more meetings than the ad hoc version.
• Your CRM. Reps use about 20% of the signals already sitting in it. Website visitors, job changes, closed-lost deals, dormant leads. Half of Sonik's own pipeline comes from signals that were already in the CRM. Calling a known contact with "How have you been?" reaches roughly 10% success against 1.5% for a cold open.
• Your founder. A founder's cold call books more meetings than an SDR's for the first year. If the founder has not made 200 calls on the current offer, the method is not proven yet.

In our experience, a team of three AEs with a dialer, signals and two call blocks a week each produces the meetings of a first SDR, with no ramp and no hiring risk. The SDR comes after, to scale what that proved. We wrote more on this in how to make more sales calls without hiring more SDRs.

The three timing mistakes we see most

1. Hiring two at once. The second SDR copies the first. If the first has not ramped, there is nothing to copy. One, then two at month six.
2. Hiring to explore a new segment. The SDR gets the worst list, the least-tested message and the lowest connect rate, then gets blamed for it.
3. Hiring under quota pressure. The decision made in the last month of a bad quarter is usually the wrong one. Start the hiring process in a good quarter, so the SDR ramps into the next one.

How Sonik approaches the hiring decision

We get asked this question by founders every week, and our answer is usually "not yet, equip first". Sonik's parallel dialer gives the sellers you already have about 5x more conversations per hour, and our signals turn the CRM into the list. Our mission is 2x more meetings through 5x more conversations with the right contacts, and for most teams under ten sellers that happens before the first SDR hire, not after.

When the hire does make sense, the same tooling shortens ramp: a new SDR reaching 10 conversations a day in week one, on a list built from signals, learns the market in a month instead of a quarter. See pricing to put the tooling line in your formula.

Conclusion

Hire an SDR to scale a method that already converts, with a stable target and a deal size that carries the cost. Before that, do the cost-per-meeting formula, stress-test it on conversations per day, and run the same formula on equipping your AEs first. This week, pull your AEs' last quarter and count first meetings per week and the share that became opportunities. That table decides the hire.