In-house SDR team versus cold email agency real cost comparison. The math most B2B companies never run before they hire
inhouse_vs_agency_todd · 2026-07-21 · 920 views
I ran cold outbound in-house for three years at a B2B SaaS company before leaving to start a cold email agency. I know both sides of this from inside the operation. Most companies make the build versus buy decision by comparing the wrong numbers.
What in-house actually costs.
A mid-level SDR in a US market runs $65,000 to $85,000 base salary plus 20 to 30 percent in benefits, payroll tax, and equipment. Call it $95,000 to $110,000 all-in annually. That is one person. One person doing cold outbound full-time at 50 sends per day is not a cold email operation. It is a person sending cold email between their other responsibilities.
The infrastructure cost is separate. Google Workspace inboxes, domains, a sending platform like Instantly or Smartlead, data from Apollo, verification through ZeroBounce. A properly equipped in-house SDR needs $800 to $1,200 per month in tools on top of their salary. That is $10,000 to $14,000 per year before you account for the time they spend managing the infrastructure instead of writing copy.
What an agency actually costs.
A cold email agency running a serious operation charges $3,000 to $6,000 per month for a managed service. Tools and infrastructure are usually included. At the high end that is $72,000 per year for a team that handles setup, copy, list building, reply management, and optimization. Less than a single mid-level SDR when you add up the full in-house number.
When in-house beats agency.
When your ICP requires deep product knowledge that cannot be documented in an onboarding brief. When your deal cycle is long and complex and the SDR relationship carries weight through the close. When you are at the stage where outbound volume is high enough to justify a dedicated team of three or more people with real specialization.
When agency wins.
When you want to test cold email as a channel before committing to headcount. When your current in-house team is under 500 sends per day. When you need cold email running in four weeks, not four months.
I have clients who moved from agency back to in-house when they hit 50 meetings per month consistently. That is the right inflection point. Until then, the agency math is hard to beat. Run the real numbers before you post the job listing.