The short version
- An agency starts faster. New sending domains need 14 days of warm-up. A new SDR must be hired first and then needs about three months to ramp.
- A US SDR costs about $103,000 a year in pay and benefits, before tools and management. One 2026 pricing guide puts cold email agency retainers at $2,000-$8,000 a month.
- In-house wins when calls or deep product knowledge open your deals, or when outbound will be a core team for years.
- A hybrid keeps your people on calls and closing while an agency runs email. A one-time build gives you a system you own and run yourself.
What are the four ways to run lead generation?
You can build it, buy it, split it or have it built for you.
- In-house team. You hire and manage your own sales development reps (SDRs).
- Agency. An outside team runs prospecting for a monthly fee. Our B2B lead generation agency service runs cold email from dedicated sending domains and inboxes, separate from your main domain, and delivers each interested lead to your Slack with name, company, email and phone number.
- Hybrid. Your people keep calls, key accounts and closing. An agency runs email prospecting at volume.
- Build and own. An agency builds the outbound system once, and your team runs it. Newlead offers this as a one-time implementation.
How do the four options compare?
The trade-offs on one screen. Numbers and sources follow below.
| Factor | In-house team | Agency | Hybrid | Build and own |
|---|---|---|---|---|
| What you pay for | Salaries, benefits, tools, data and management | A monthly fee, sometimes plus a setup fee | A smaller team plus an agency fee | A one-time build, then tools, data and staff |
| Time to first conversations | Hiring, then a 3.0-month ramp | 14 days of warm-up, then replies from the first email | Agency pace on email | The build and warm-up, then a learning curve |
| Control | Full | You set the target and judge the leads | Split by channel or task | Full, after handover |
| Main risk | Slow hiring, a missed ramp, reps who leave | A poor-fit agency and one-vendor dependence | Leads going cold in the handoff | Nobody on your side running it well |
| Knowledge | Stays while your reps stay | Mostly with the agency | Shared | Stays with you |
| Best for | Phone-led, complex or enterprise sales | A fast start, or testing a market | Teams with a seller who has spare capacity | Teams with someone to run outbound daily |
What does each option cost, and who carries the risk?
A US in-house SDR costs about $103,000 a year in pay and benefits, and you carry the hiring and turnover risk. An agency costs a monthly fee, and you carry the risk of picking the wrong one.
The in-house figure is our estimate. Bridge Group's 2025 SDR research, covering 351 B2B companies, puts median on-target earnings at $80,000 a year. BLS data for June 2026 shows wages at 70.0% and paid leave at 7.5% of private-industry employer costs. A salary already covers paid leave, so $80,000 divided by 0.775 is about $103,000, or $8,600 a month, before tools, data, recruiting and management.
In the UK, average SDR pay is £39,774 a year (Glassdoor UK), and employers add 15% National Insurance on pay above £5,000 a year (GOV.UK, 2026 to 2027, last checked 3 October 2026). That is about £45,000 before pension, tools and management, or less if you can use the £10,500 Employment Allowance.
Agency fees depend on channel and scope. Cleverly's 2026 pricing guide puts cold email retainers at $2,000-$8,000 a month and multi-channel programs at $5,000-$15,000 or more. Newlead works on monthly retainers priced on your target market, volume and goals. Every pricing model is compared in what B2B lead generation costs.
Where the risk sits:
- In-house: you pay through the ramp, and again when someone leaves. Bridge Group found a median attrition of 40% a year and only 60% of SDRs at quota, the lowest in the study's history.
- Agency: you pay while you find out whether it fits. Short terms and a written lead definition make a poor fit cheaper to leave.
- Build and own: after handover, the results risk and the running costs are yours.
Market risk is the same for all four. If your market ignores well-run cold email, it will ignore it from your own SDR too. For the full SDR cost comparison, including cost per meeting, see outsourced SDR vs in-house SDR cost.
How fast does each option start producing conversations?
An agency is faster: weeks instead of months. Bridge Group puts average SDR ramp at 3.0 months, and that clock starts only once you have hired someone.
With cold email, the fixed wait is warm-up. New sending domains need 14 days before the first emails go out, and replies then start with the first email. In the largest campaign of our own outbound, 60.0% of all replies came from step 1. A fair verdict comes about five weeks after warm-up starts, once the first contacts have had the full sequence.
An in-house hire who starts cold email from scratch faces the same warm-up on top of the ramp. A build adds the build itself and your team's learning time. The week-by-week timeline is in how long cold email takes to work.
Who controls the work, and who keeps the knowledge?
An in-house team gives you the most control and keeps the skills inside, but only while your reps stay.
Bridge Group found an average SDR tenure of 1.9 years. Promotions made up 16 points of the 40% yearly attrition, so some of the knowledge stays in the company. The rest leaves with the rep.
With an agency, you trade daily control for a process that already runs. You set the target market, read the reports and judge the leads. Newlead sends a monthly report with campaign statistics if you want one. Put the lead definition in writing. Ours: the person fits your ideal customer profile, has shown interest in writing and has the authority or influence to make buying decisions. More in what a qualified B2B lead is.
The weak spot is knowledge, because the playbook and the test results sit with the agency. Ask before you sign what you keep if you stop: the leads, the lists, the copy and the reply history. With build and own, the system is yours.
When does building in-house win?
In-house is the better choice when the first conversation needs a phone or an expert, or when outbound will be a core team for years.
- Calls drive your pipeline. The median SDR in Bridge Group's research logs 44 calls a day out of 112 activities. If your buyers answer the phone, hire people who dial. We run email, not calls.
- Your product is complex or high-value. In SaaStr's 2023 survey of 1,200+ respondents, only 7% said outsourced SDRs really worked and 26% said they sort of worked. Respondents pointed to complex products and high contract values that need deep product knowledge.
- You sell to a short list of large accounts. When we emailed US enterprises to sell our own service, it took 2,500+ contacted leads per opportunity, so our benchmark report recommends a different channel there.
- Outbound is a long-term core team. With a leader who can hire, coach and run SDRs, building the skill inside can pay off, and the SDR seat is a common path to account executive.
When does an agency win?
An agency is the better choice when you need conversations this quarter, have no outbound skills on the team, or want to test a market before you hire for it.
- You need pipeline soon. Weeks of warm-up beat months of hiring and ramp.
- Nobody in-house runs outbound. List building, deliverability, copy testing and reply handling are separate skills, and an agency brings all four.
- You are testing a market. SaaStr respondents said outsourcing worked better in a specialized market, or for a new region or segment with good enablement.
- Your market is big enough for email. Our own outbound needed 202 contacted leads per opportunity overall. A market of a few dozen accounts needs another approach.
- You don't want fixed headcount yet. A retainer can be scaled or stopped. Newlead's runs for at least three months, then month to month.
One caution: the SaaStr write-up argues that outsourcing works best once you have made outbound work in-house. If you are new to outbound, set a written lead definition and a review date, and read the replies yourself. Our guide on how to choose a B2B lead generation agency lists the questions to ask.
When does a hybrid make sense?
A hybrid makes sense when you have a seller with spare capacity, or when your deals need both email and a phone call.
A simple split: the agency runs email prospecting and handles the replies, and your rep calls the interested prospects and closes. With Newlead, each interested lead lands in your Slack with name, company, email and phone number, so your rep can call while the interest is fresh. Booking meetings into your calendar is an optional add-on.
Hybrids break when the handoff is slow, so agree up front who follows up and how fast. Our outsourced SDR services page shows which SDR tasks we take over and which stay with you.
Can an agency build a system you own?
Yes. In a build-and-own setup, the agency sets up the outbound system once and hands it over to your team.
That is our one-time implementation: we build the outbound system and you own it. You pay for the build rather than a running service, and the knowledge stays in your company.
Our implementation includes two 30-minute meetings with Max Erikstedt. In the first, we set up the whole system together and start the warm-up. Our team then builds the copy, campaign structure, settings, sending schedule, lead lists, data enrichment, email signatures and sequences. In the second, we go through everything together and show your team how to run the campaigns in Instantly before you press start.
It fits teams with someone who can run sending, deliverability, copy tests and replies every day. After handover, you carry the results risk and pay for data, tools, domains and inboxes.
Does AI change the decision?
Not much yet. AI changes who writes and sends the emails, but someone still has to own the targeting, the list, the sending setup and the replies.
AI SDRs showed up as their own category for the first time in Bridge Group's 2025 research, at 1% of respondents. In a Gartner survey of 645 B2B buyers published in May 2026, 45% had used GenAI, mainly to gather information on vendors and products. The same survey found that 67% prefer a sales rep-free experience, yet 69% prefer to check AI-generated insights with a sales rep. An AI tool is software you run in-house, with the same need for a clean list, healthy domains and fast replies.
What we see in our own campaigns
Whoever runs your outbound needs the same machine, and our own numbers show the volume it has to handle. These figures come from Newlead's own campaigns, where we sell our own service, not from client campaigns.
Across 24 campaigns we sent 371,590 emails to 143,319 decision-makers. The reply rate was 1.89%, counting human replies only, and it took 202 contacted leads to create one opportunity, meaning a reply positive enough to log as a live sales conversation. At that rate, 10 opportunities a month means reaching about 2,000 new decision-makers a month. Markets differ: for small and mid-market companies we plan for 40 to 50 contacted leads per opportunity in the Nordics, about 100 in the UK and 280 to 370 in the US.
That is real work for any team. We verify every address before it enters a sequence and rebuild lists monthly rather than reusing them, and bounces stayed at 0.62% across all sends. Copy needs testing too: two versions of the first email in the same campaign got 0.67% and 0.25% reply rates, a 2.6x difference. An in-house team has to build these habits. An agency should already have them.
Results depend on your market, your offer and the size of your list, so treat these numbers as a sense of scale, not a forecast. Full data and definitions are in our cold email benchmarks for 2026. To run the numbers for your own market, book a 30 minute discovery call.
Sources
- Bridge Group, 2025 SDR Models, Motions & Metrics research (published 6 February 2025)
- U.S. Bureau of Labor Statistics, Employer Costs for Employee Compensation, June 2026 (released 9 September 2026)
- Glassdoor UK, Sales Development Representative salaries (accessed 3 October 2026)
- GOV.UK, Rates and thresholds for employers 2026 to 2027
- Cleverly, B2B lead generation agency cost guide (updated 16 March 2026)
- SaaStr, Only 7% of You Have Really Gotten Outsourced SDRs to Work (16 May 2023)
- Gartner, Survey Finds 69% of B2B Buyers Turn to Sales Reps to Validate AI-Generated Insights (20 May 2026)
Last checked 3 October 2026.