In-house SDR vs outsourced SDR vs AI SDR: cost, control and fit

All three do the same early-stage job: find accounts that fit, research them, reach out, follow up and book meetings for account executives. What changes is who does the work, where it runs and who owns the result. An in-house SDR is your employee, working in your tools. An outsourced SDR works for an agency, usually from the agency’s own systems and playbook. An AI SDR is software that researches, drafts and sends, with as much human review as you set up.

A fourth option sits between them. Software does the research and drafting, and a person, your own or an external one, makes the calls and follow-ups inside your own workspace. The table compares all four on the points buyers ask about most. Figures come from the sources listed at the end of this page.

In-house: the Bridge Group’s 2025 report, based on 351 B2B companies, puts median SDR on-target earnings at $80,000. The US Bureau of Labor Statistics reported that benefits made up 30.0% of private-industry employer compensation costs in June 2026. Our estimate of pay plus benefits is $80,000 ÷ 0.70, an estimated $114,000 a year, before tools, data and recruiting. With a manager’s share, it is about $146,900.

Outsourced: published ranges vary. Revnew, an outsourcing firm, puts 2026 retainers at $4,000 to $18,000 a month. SalesRoads lists $11,950 per four-week period for one SDR on its pricing page, checked October 7, 2026. Per-meeting fees run from about $75 to $750 across the guides we checked.

AI SDR: AiSDR lists plans from $250 to $2,500 a month, and 11x lists its Growth plan from $3,750 a month, billed annually, as of October 2026. Add your own review time to any of these. Our guide to outsourced SDR cost has the full breakdown, with each formula shown.

A new in-house SDR took 3.0 months on average to ramp in the Bridge Group’s 2025 data, after the time it takes to hire. The same report found average tenure of 1.9 years and median annual attrition of 40%, counting promotions. On those averages, about 3 of every 23 months an SDR spends with you, roughly 13%, is ramp. That share is our estimate from the two figures.

Agencies start sooner because their SDRs are already hired and trained. SalesHive, for example, says it launches in two to three weeks, checked October 7, 2026. That is a vendor claim, and the SDR still has to learn your product, market and objections before messages land.

AI SDRs start within weeks, but the setup work is the same for every option: a written ideal customer profile, exclusions, an offer worth replying to, warmed sending domains and rules for who may contact whom. Whoever does the work, weak inputs produce weak meetings.

Control is highest when the people writing and calling sit inside your own process. An in-house SDR uses your talk tracks, your CRM and your approval habits. An outsourced SDR follows a playbook you agree with the vendor, but day-to-day wording and judgment sit with someone you did not hire and do not manage.

Brand risk follows control. In a Gartner survey of 632 B2B buyers, published in June 2025, 73% said they actively avoid suppliers who send irrelevant outreach. A wrong company name, an off-target list or a pushy script reaches buyers under your name, whoever sent it.

Two checks reduce the risk with any option. First, require approval of every message by someone on your team before it is sent, not a sample. Second, reserve your most important accounts and senior executives for your own people. An AI SDR on full autopilot carries the same risk as an unsupervised agency.

With an in-house SDR, everything is yours: the CRM records, call notes, sending domains, phone numbers and the history of every touch. With an AI SDR, the research and messages live inside the vendor’s tool, so check what you can export and what happens to it when you cancel.

Outsourced SDR contracts vary most here. Some agencies send from infrastructure they set up for you. Belkins, for example, says it builds outreach infrastructure that mirrors your organization, including lookalike email domains, checked October 7, 2026. That can work well, but ask in writing who owns those domains, mailboxes, phone numbers, lists and recordings when the contract ends.

A simple test: if you stopped the arrangement tomorrow, could your next hire open the CRM and see every account touched, every message sent and every reply? If not, part of what you paid for leaves with the vendor. Make sure the answer is yes before the first message goes out.

In-house teams scale one hire at a time. Each new SDR brings recruiting time, about three months of ramp, and a share of a manager. The Bridge Group found 6.4 SDRs per first-line leader in 2025, so a sixth or seventh hire usually means planning for another manager too.

Outsourced programs scale by adding seats, often at a lower cost per seat. SalesRoads lists $16,750 per four weeks for two SDRs and $43,150 for six, checked October 7, 2026. Scaling down is a contract question, so check notice periods and minimum terms.

AI SDRs scale research and drafting cheaply, because more accounts mostly means more software usage. What does not scale on its own is review time and live conversation. If every message is approved by a person, plan how many approvals that person can handle in a week before you raise the volume.

In-house SDR

• Deals are large, the market is small, and every account deserves a person’s full attention.
• Your message is still being found, and you want live conversations to shape it.
• You want a path from SDR to account executive inside your company.

Outsourced SDR

• You need coverage before you can hire, or want to test a channel without a permanent role.
• Your motion already works in-house, so the vendor follows a proven playbook. Jason Lemkin of SaaStr writes that outsourcing worked for him only when he had already done the function well himself, and only when he treated the outsourced resources as part of the core team.

AI SDR

• You have more good-fit accounts than people to research them.
• Your ideal customer profile is clear, and someone on the team can approve messages.

In the hybrid, software does the homework and people do the conversations. Agents find the accounts worth selling to, research each one, accept or reject it against your rules, map the buying committee and draft the outreach. A person, your SDR or an external one, makes the calls, handles follow-ups and replies, and hands interested buyers to an account executive.

What separates this from outsourcing is where the work happens. The person works inside your own workspace, on the same queue as your team, under your approval rules; every touch is logged to your timeline, and sent email is copied to your CRM. Nothing is rebuilt when the arrangement ends, because nothing lived anywhere else.

It also changes what you pay a person for. Less of their day goes to building lists and switching between sources, and more to calls and judgment. No independent study yet measures hybrid results against the other three, so test it on accounts you know and compare meetings held, not meetings booked. Our comparison of AI and human SDRs covers the hybrid SDR model in more detail.

SalesOne is software first. S1 agents research and qualify each account, map the buying committee, and draft outreach and call plans, and your team approves and sends. When your team is short of time, you can add an SDR seat: a SalesOne SDR, an outsourced SDR who works inside your SalesOne workspace, on the same queue, alone or alongside your own SDRs.

With an SDR seat, approvals stay with your team: the SDR’s sequence emails wait for a person on your team, and every approval is recorded with who gave it. Outreach rules can reserve roles for your team, such as the C-suite for your CEO. Do Not Call, local calling hours and CAN-SPAM checks run before each call and email.

Your accounts, records and CRM history stay with you when the seat ends. Sent email is copied to your CRM by BCC when your CRM BCC address is set. The seat can cover research checks only, follow-ups, overflow, a role while you hire, or a new segment. It is quoted with your plan on the call.