In-House Security Team vs MSSP: Costs Benefits and Trade-Offs

Building a minimal in-house security operations capability requires three to five analysts on rotating shifts, costing £150,000 to £325,000 per year in salaries alone — before tooling, training, and recruitment costs. An MSSP delivers equivalent 24/7 monitoring and response for £10,000 to £50,000 per year, depending on scope. For most UK SMEs, the MSSP model is the only financially viable route to genuine security coverage.

Yes, and often more effectively. MSSPs handle hundreds of clients and see a broader range of attack patterns, giving their analysts experience that a small in-house team cannot replicate. Good MSSPs also maintain runbooks specific to your environment. With 85% of businesses that experienced a breach identifying phishing as the vector (DSIT 2025), the MSSP's volume of phishing investigations is a genuine advantage.

No. An MSSP handles operational security — monitoring, detection, and response — whilst your business retains strategic oversight. You set the policies, risk appetite, and compliance objectives. The MSSP reports against these, providing monthly threat summaries and recommendations. Think of it as outsourcing the security operations centre, not the security decision-making.

Most organisations find that an in-house security team only becomes cost-effective above 500 to 1,000 employees, where the security budget can sustain dedicated analysts, tooling, and continuous training. Below that threshold, the average cost of the most disruptive breach at £3,550 (DSIT 2025) and the difficulty of recruiting specialist talent make an MSSP the more practical and affordable choice.