Every B2B founder at some point runs the same math. Should we hire an SDR, build the cold email operation internally, or pay an agency to run it for us. The wrong answer kills 12 to 18 months of pipeline. The right answer depends on four variables, and most operators only weigh two of them before they commit.
This is the comparison we walk every prospect through before they sign with us. The goal is not to push toward the agency answer. It is to make the trade-offs explicit so you can commit without regret. At the bottom is the break-even point where in-house starts to beat outsourced, and a straight answer on when to pick each.
The four variables that actually matter
- Required monthly send volume. 10,000, 50,000, or 200,000 sends a month are fundamentally different operations.
- Time horizon to first booked meeting. Agency: 45 days. In-house with existing SDR: 60 days. In-house from scratch: 90 to 120 days.
- Specialisation of the offer. Highly technical offers need in-house domain knowledge in the copy. Commodity offers do not.
- Operator headcount dedicated to outbound. Zero, 0.5 FTE, 1 FTE, or 2 plus FTE all tilt the math differently.
Everything else (infrastructure cost, tool subscriptions, branded domains) is a rounding error on top of these four. The tool cost differential between in-house and outsourced is under 1,500 dollars a month. The labour and time cost differential is 10 to 30 times that.
The true cost of in-house cold email
The line item most operators miss is total operator cost, not tool cost. Running a functional in-house cold email operation requires one full-time operator who understands deliverability, list building, copy, and reply management. That headcount is 70,000 to 130,000 dollars a year fully loaded, before any results.
The cost stack for a typical in-house setup
SDR or operator (fully loaded)
$7K to $11K / mo
Apollo or equivalent
$150 / mo
Clay or Floker
$350 to $800 / mo
Sequencer (Smartlead, Instantly)
$99 to $299 / mo
Infrastructure (domains + inboxes)
$300 to $1,500 / mo
Total fully loaded
$8K to $14K / mo
The cost that never shows up in the spreadsheet
Ramp time. A new in-house operator takes 60 to 90 days to hit competent campaign performance. During that ramp, the pipeline they generate is roughly 30 percent of steady state. That lost pipeline is a real cost of 15,000 to 40,000 dollars in deferred revenue, most of which is never measured.
The true cost of an outsourced agency
A competent outbound agency runs 3,000 to 8,000 dollars a month depending on volume, vertical, and deliverable guarantees. At the low end you get 10,000 to 20,000 sends a month. At the high end, 100,000 to 300,000 sends split across multiple campaigns.
What the agency fee covers
- Infrastructure. Domains, inboxes, warm-up, sending tools. No separate line items.
- Operator time. List building, copy, campaign management, reply triage on most plans.
- Tooling. Enrichment, verification, sequencer access. Bundled into the retainer.
- Compliance and reputation management. The agency carries the risk of a burned sending domain.
What the agency fee does not cover
Deep domain knowledge of your offer. Technical sales conversations. Late-stage nurture after the reply. Account-based outreach on top-30 enterprise accounts. For those, you still need internal sales people, regardless of whether the top-of-funnel is outsourced.
The break-even math
The break-even point is where in-house starts to win on cost, assuming competent execution. Below the break-even, an agency delivers more pipeline per dollar. Above it, in-house is cheaper at scale.
Volume threshold
> 200K sends / mo
Team size
> 2 FTE dedicated
Time horizon
> 12 months of commitment
Vertical depth
Specialised or technical offer
All four conditions need to be true for in-house to beat an agency on a straight cost basis. Miss any one and the agency wins on speed, cost, or both. Most B2B companies do not hit all four. For them, the agency is the rational choice, not a compromise.
The decision framework
Pick in-house if
- Your send volume is above 200,000 a month sustained.
- You have an existing SDR or marketing operations hire with cold email experience.
- Your offer requires deep technical knowledge to write competent copy.
- You are committed to a 12 month plus horizon of building the capability.
Pick outsourced if
- You need booked meetings in 60 days or less.
- You do not have an operator dedicated to outbound full-time.
- Your send volume is below 100,000 a month.
- Your offer is service-based or commodity and the copy does not require deep domain expertise.
The hybrid model works for some teams. Outsource the top-of-funnel volume to an agency, keep the enterprise-tier account-based outreach in-house where your internal sales team can add real value. This is the most common end-state for mid-market B2B companies. Start with pure outsourced, graduate to hybrid when the top accounts need attention that an agency cannot give.