Outsourced SDR Team vs In-House: Pros, Cons and Costs

B2B sales leaders trying to scale their pipeline face a crucial decision that can make or break their growth targets: should you build an in-house Sales Development Representative (SDR) function, or partner with an outsourced SDR team like Flowd?

This article breaks down the pros, cons and costs of each option so you can make a data-backed decision that’s right for your business.

In-House vs Outsourced SDR: The real cost of hiring an SDR in the UK

Hiring a sales development representative comes with more costs than a basic salary. The true employment cost of an SDR in the UK typically runs 1.5–2x the base salary once you consider all the extra cost factors.

SDR Average Salary in 2025

In the UK, an entry to mid-level SDR commands an average base salary between £30,000 and £38,000, according to data from Glassdoor and Payscale.

No doubt that sounds manageable for most growing or established businesses — but once you layer in National Insurance, pension, bonuses, time spent training, recruitment, staff turnover and equipment/sales tech, the true cost quickly climbs above £60,000 a year.

Let’s see how it breaks down:

And these are considered as conservative figures. If you’re using a recruitment agency, building new workflows and rolling out new software licences (new data sources, for example), the total climbs even higher.

Don’t forget time and turnover

Building an in-house SDR team also means other departments spending their time on:

• Writing job specs
• Vetting candidates
• Interviewing
• Training and development
• Monitoring performance
• Replacing them if they leave (an average SDR tenure is just 16 months)

And if your business doesn’t have a dedicated SDR Manager, the responsibility falls on your Head of Sales, or even your Founder, whose time could likely be better spent elsewhere.

As you can see, the average salary of a Sales Development Rep in the UK and the true cost are two different things. It’s important to take into consideration the overall cost, from salary all the way through to internal resource allocation, when deciding whether to go in-house or outsourced with your lead generation strategy.

How many meetings should an SDR deliver?

The average amount of sales meetings an internal SDR may deliver each month will vary from business to business depending on many variables, such as the size of your sales team, your targets and the size of your market. 

A study by Operatix suggests that a productive SDR should book around 15 meetings per month, which, with a typical ~20% no-show rate, results in 12 completed meetings per month.

If you have a meeting-to-opportunity conversion rate of approximately 60%, that means a well-performing SDR will generate 7–10 viable sales opportunities each month.

Bear in mind that this is only once they’re fully ramped. For most companies, this ramp-up can take 3–6 months depending on onboarding, training and market familiarity.

And all of the above figures are assuming:

1. You’ve hired the right person
2. You already have a clear outbound strategy for them to execute
3. Your SDR will have access to accurate data and good messaging
4. You’ve got someone actively managing and coaching them

If any of those pieces are missing, the number of meetings, and opportunities, drops — fast.

How many meetings should an outsourced SDR team deliver?

When you’re paying a retainer fee to an outsourced Sales Development agency, the biggest question you’ll ask yourself is: how many meetings should you actually expect in return?

Most reputable prospecting teams in the UK, like Flowd, aim to deliver around 8 qualified meetings per month. Your mileage may vary depending on your target market and campaign scope, and any good partner will explore your expectations during the pitch phase, so it’s important to ensure targets are aligned before signing on the dotted line.

If your agency delivers 8 meetings per month, you are getting similar results to what you’d expect from an internal SDR, minus the recruitment costs, training time, and investment into tech and equipment.

A good agency shouldn’t focus on vanity numbers like open rates. The goal is to minimise opportunity leakage and provide high-intent conversations with decision makers that have been pre-qualified and are ready to be pitched to.

Now we’ve looked at outsourced SDR teams in general, let’s quickly look at what Flowd clients can expect when working with us. After that, we’ll weigh up the pros and cons of in-house vs outsourced prospecting teams.

What you get when working with Flowd to outsource lead gen

Flowd retainers start at approximately £4,000 per month. Unlike an in-house hire, that covers everything: your data, copy, strategy, deliverability infrastructure, outreach, tech stack, inbox management, and the priceless knowledge of a highly experienced team of sales development specialists.

In terms of the return on investment from partnering with Flowd, Flowd clients receive average of 8 high quality, pitch-ready sales meetings each month. These aren’t just “calls booked” — they’re meeting with pre-qualified, senior decision makers perfectly aligned to your ICP. So, whether you’re targeting niche verticals or enterprise buyers, Flowd handles the prospecting from start to finish so your sales team can focus on closing.

Flowd campaigns in numbers:

• 700% average ROI 
• 94% average meeting attendance rate
• Fast onboarding with meetings typically landing by week 2–3
• Transparent performance reporting so you know exactly what’s working

Most of our clients will recoup several months, or sometimes years, of campaign spend from just one deal. And because our model is built on consistent quality, not volume for the sake of volume, we’re optimising every part of your campaign from deliverability to copy.

TL;DR – Flowd delivers approximately the same number of qualified meetings per month that you’d expect from an SDR — without the recruitment risk, ramp-up time or operational burden of building your own team.

Pros and Cons: In-House vs Outsourced SDR Teams

Now we’ve covered all bases, let’s weigh up the strengths and trade-offs of each possible route:

In-House SDR Team

Pros:

• Full control over scripts, tone and targeting
• Builds internal capability for long-term GTM campaigns
• Immediate feedback loops with sales and marketing teams
• Can evolve into a growth function

Cons:

• High total cost (~£60,000+ per rep each year)
• Lengthy ramp-up time (~6 months to hit full capabilities)
• Requires ongoing training and management
• Risk of churn and repeated hiring cycles
• Tech stack, deliverability infrastructure and compliance falls on you
• Scaling is expensive and means repeating the hiring process

Outsourced SDR Team

Pros:

• Fast launch: see meetings within 30 days
• Lower fixed costs (e.g. Flowd starts at £4k per month)
• Fully-managed for you, including copy, strategy and data
• Predictable output
• ROI-focused and highly scalable

Cons:

• Less visibility on a day-to-day basis
• Requires more structured briefing to pivot strategies (not as reactive as internal hires)
• Requires coordination to align on ICP and tone
• Success varies depending on provider quality

In-House vs Outsourced SDR Team: Which is right for your business?

Now you’ve seen the numbers, industry benchmarks, and pros and cons of building your own sales dev team vs using an agency. But how do you actually decide which is best for you?

Here’s how to think about it:

When building an in-house Sales Development team is your best option:

• You have the time, resource and budget to recruit, train and manage an internal function
• You want to build a long-term internal capability and control every part of their output
• You already have a dedicated SDR Manager or Head of Sales with capacity to coach, quality control and optimise
• You’re planning for multiple campaigns over multiple years where embedded brand knowledge really matters

Expected cost: Approximately £60k per hire

Ramp-up time: 3 months for minimum productivity, 6 months for full capacity

Tip: Dead set on building an in-house prospecting team? Grab our Outbound Sales Playbook — it contains the exact tactics we used to book meetings with brands like Tesla, Nike and SUEZ.

When outsourcing to a Sales Development partner is your best option:

• You want results fast
• You don’t have bandwidth to manage an internal SDR
• You want to test a new market or segment before committing to new hires
• You’re scaling a lean sales team and need predictable results without adding to headcount
• You’ve tried hiring SDRs before and it didn’t work out

Expected cost: Variable (prices starting from £4,000 per month at Flowd)

Ramp-up time: 2–4 weeks on average

Even if you haven’t made up your mind at this point, no doubt you’ve realised there’s no one-size-fits-all answer when it comes to sales development. 

However, partnering with a specialist agency like Flowd gives you speed, focus, a strong ROI and no need to manage prospecting, infrastructure or copywriting in-house, which is the easier (and cheaper) route more often than not.

Is outsourced SDR the smarter way to build your sales pipeline?

Outsourcing isn’t just for early-stage startups with no headcount and limited funds. It’s a strategic move for businesses in any growth-stage that need results now, not two quarters down the line. We’ve worked with, and delivered sales meetings for, over 300 brands — from boutique marketing agencies to huge multi-national enterprises.

Hiring in-house gives you control, but it comes with risk, delay and a hefty price tag. Recruitment, onboarding, tool setup, training — the true costs of a single SDR quickly stack up and can easily surpass £60,000 a year. And that’s with no guarantee of pipeline until month 4 or 5 (if they stick around that long).

That’s why so many sales leaders choose Flowd. They get:

• Speed: meetings booked in under 30 days
• Simplicity: no hiring headaches, training or management overheads
• Scalability: campaigns that can be ramped or paused based on results or business needs

If your team is stretched, pipeline patchy, or your last SDR ghosted — Flowd offers a faster, simpler route to growth.

Plus, unlike the in-house route, we’re fully accountable for performance across the board. No pointing fingers at the tech team and blaming them for low deliverability or digging out the copywriters for weak CTAS — we manage the whole process, so if we’re not delivering, you don’t stay. Doesn’t get much simpler than that.

Ready to test Flowd yourself?

Hopefully you now have a clearer understanding of the pros, cons, costs and considerations of an in-house SDR team versus outsourcing it. 

And we totally understand that outsourcing any aspect of your business can feel like a risk, even if the numbers suggest it’s less financially risky than going internal. 

That’s why we’ve made it easy to try us out with no long-term commitment.

Outsource Sales Development to Flowd for 90 days

We’ll build your campaign, launch it and start delivering qualified meetings in under a month. Flowd campaigns return an average of 8+ high quality meetings per month — all with pre-qualified decision makers in your ICP. Straight into your teams’ diary and ready to be pitched to.

And if it’s not working for you after the 90 days are up? Walk away, no hard feelings.

Book a discovery call today to see what a fully-managed, outbound engine could do for your pipeline.

Sources:

Durhamlane – Build or Buy: SDR Team Cost Comparison
https://durhamlane.com/blog/build-or-buy-sdr-team/

Glassdoor – SDR Salary Insights UK
https://www.glassdoor.co.uk/Salaries/sales-development-representative-sdr-salary-SRCH_KO0%2C36.htm

Payscale – Sales Development Representative (SDR) Salary Data (UK)
https://www.payscale.com/research/UK/Job%3DSales_Development_Representative_%28SDR%29/Salary

Punch! – Free Calculator: The Cost of Hiring an Internal SDR
https://www.punchb2b.com/blog/free-calculator-the-cost-of-hiring-an-internal-sdr

Revnew – Outsourced vs In-House SDR: Which Is Right for You?
https://revnew.com/blog/outsourced-vs-inhouse-sdr

Bridge Group – 2021 SDR Metrics & Compensation Report
https://info.bridgegroupinc.com/blog/2021-sdr-metrics-and-compensation

Operatix – SDR Metrics: Outbound & Inbound Teams Benchmark
https://www.operatix.net/blogs/sdr-metrics-outbound-inbound-teams/

Gradient Works – 2024 B2B Sales Benchmarks
https://www.gradient.works/blog/2024-b2b-sales-benchmarks

Air Marketing – In-House vs Outsourced Sales Teams: What You Need to Know
https://www.air-marketing.co.uk/resources/insight/in-house-vs-outsourced-sales/