"Should we hire an SDR or work with a cold email agency?" is one of the most common questions B2B sales leaders ask. The honest answer: it depends, and the trade-offs aren't what most LinkedIn posts make them sound like. This is a numbers-first comparison from a team that has seen both models from the inside.
The real cost of an in-house SDR
Most cost calculators only show base salary. The full loaded cost is roughly 1.6× base when you include benefits, tools, management time and ramp.
Typical US/EU mid-market SDR economics:
- Base salary: $55,000–$75,000
- OTE: $75,000–$95,000
- Benefits + payroll tax (~25%): $14,000–$24,000
- Tools (CRM seat, sequencer, data, enrichment): $4,000–$8,000/year
- Sales manager time (10%): $15,000+
- Recruitment cost (amortized): $8,000+
Loaded annual cost: roughly $110,000–$140,000. Monthly equivalent: ~$9,500.
The hidden cost: ramp and attrition
An SDR is rarely productive in their first 90 days. Industry average ramp to full quota is 3–5 months. SDR attrition averages 14 months. That means in any given 24-month window, you're paying full cost for an average of 16 productive months, assuming you successfully backfill.
Effective monthly cost during productive months: ~$13,500.
The real cost of a managed cold email agency
A solid managed agency for B2B cold email runs $2,000–$4,000/month, all-in. No setup fees, no per-meeting commission, no separate tooling cost.
What that typically includes:
- ICP and list building
- Copywriting and sequence design
- Domain setup and warmup
- Sending infrastructure (multiple inboxes)
- Reply triage and meeting booking
- Monthly reporting
Side-by-side comparison
| Dimension | In-house SDR | Managed agency |
|---|---|---|
| Effective monthly cost | ~$13,500 | $2,000–$4,000 |
| Time to first meeting | 60–90 days | 10–14 days |
| Time to full ramp | 3–5 months | Immediate |
| Pause / scale flexibility | Painful | Same week |
| Specialized deliverability skill | Rare | Standard |
| Discovery + close ownership | Yes | No (handoff) |
| Knowledge stays in company | Yes | Partially |
| Hiring + management overhead | High | None |
When an SDR is the right answer
- You need someone who runs discovery calls, not just books them
- You want pipeline knowledge and process built inside the company long-term
- You have a strong sales manager with bandwidth to coach
- Your motion needs heavy account research, multi-threaded outreach across LinkedIn, phone and email
- You're at $5M+ ARR and pipeline is already steady
When a managed agency is the right answer
- You need pipeline now, not in six months
- Your founder or AEs are doing prospecting in their off-hours
- You don't have a senior sales manager to coach an SDR
- You want to test if cold email works at all before committing to a hire
- Your deal size is large enough that 5–10 meetings/month moves the needle
The hybrid pattern that often wins
Many of our best clients use both: agency for cold email lead generation, in-house AEs for discovery, demo and close. The agency owns the top of the funnel where deliverability and copy expertise compound. The internal team owns relationships and revenue.
This sidesteps the worst part of the SDR role, the soul-crushing part of sending the same sequences to thousands of people every month, and frees in-house talent for what only they can do.
How to decide in one question
"If pipeline doubled in the next 60 days, would my closers be the bottleneck or the problem?"
- If closers are the bottleneck: hire an AE before adding more pipeline.
- If closers have capacity: a managed agency is almost certainly the faster, cheaper move.
If you'd like a no-pressure read on which model fits your situation, that's exactly the conversation we have on a fit call. Book 30 minutes, we'll be honest if cold email or our model isn't right for you.