What Is an SDR and Do You Need One for Your B2B Business?

If you are building a B2B sales function, you will encounter the term SDR — Sales Development Representative. Understanding what an SDR does, how they fit into a broader sales team, and whether you actually need one is critical to making smart growth decisions.

What Does an SDR Do?

An SDR is responsible for the top of the sales funnel: identifying potential customers, reaching out to them through email, LinkedIn, and phone, qualifying their interest and fit, and booking meetings for Account Executives (AEs) or senior salespeople to close.

SDRs do not typically close deals — that is the AE's job. Their sole focus is generating qualified pipeline: enough of the right conversations happening regularly to give the closing team the opportunities they need to hit revenue targets.

The SDR Role in Practice

A typical SDR day involves researching prospects, personalising outreach messages, sending emails and LinkedIn messages, making follow-up calls, handling responses and objections, and booking and confirming meetings. It is high-volume, high-effort work that requires resilience, organisation, and strong written communication.

The challenge is that SDR performance is highly variable. Great SDRs are transformative; poor SDRs are expensive and demoralising. The hiring, onboarding, and management of SDRs is a specialist skill in itself.

What Does an SDR Cost?

In the UK, a junior SDR earns £25,000–£35,000 base, with OTE of £35,000–£50,000 including commission. Senior SDRs command higher bases. When you add employer NI contributions (13.8% above threshold), pension contributions, equipment, software (CRM, sales engagement tools, data providers), and management overhead, the true annual cost of a single SDR often exceeds £60,000–£70,000.

Add a 3–6 month ramp period during which productivity is limited, and an average SDR tenure of just 14 months, and the ROI calculation becomes more challenging.

Do You Need an SDR?

For many B2B companies — particularly those with fewer than 20 salespeople or in the early stages of building a sales function — a full-time SDR hire is not the most efficient route to pipeline. The fixed cost is high, the ramp time is long, and the management overhead is significant.

The alternative is outsourced appointment-setting, which delivers the same output — qualified meetings booked — at a lower total cost, with no ramp period, no management overhead, and with the flexibility to scale up or down as needs change.

Supernova AI provides the meetings output of a full SDR team without the hiring, management, and overhead costs. Discover whether outsourced appointment setting is right for your business: https://calendly.com/lucas-3cps/discovery-call