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ISDN and PSTN Switch-Off: What Education Leaders Need to Do Now

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Robert Gould FRICS

Partner | Award-Winning Property & Construction Consultants

Man in a suit hanging up a landline phone
Man in a suit hanging up a landline phone

The Department for Education has issued new guidance reminding education providers to prepare for the UK-wide switch-off of the Public Switched Telephone Network (PSTN), Integrated Services Digital Network (ISDN), and copper-based services by January 2027.

While this change is being led by telecoms providers, its implications for schools, trusts, and wider education estates are significant and require early, strategic action.

Legacy phone lines often underpin far more than voice calls. Across education estates, PSTN and ISDN connections are commonly embedded within fire and security alarms, CCTV, lifts, access controls, cashless catering, emergency phones and assistive technologies.

Without proactive planning, the switch-off presents a real risk of service failure, compliance gaps and unplanned costs.

Key Actions For Education Organisations

Senior leaders should ensure their estates teams are:

  1. Auditing all buildings to identify where PSTN, ISDN or copper broadband services are still in use
  2. Mapping critical dependencies, particularly life-safety and safeguarding systems
  3. Reviewing contracts and supplier readiness, including transition timescales
  4. Planning migration to digital alternatives, such as VoIP and fibre-based connectivity
  5. Building costs and delivery into medium-term capital and IT strategies

Why Act Now?

Although 2027 may feel distant, telecoms providers are already withdrawing services. Early action reduces risk, avoids emergency replacements and enables better value through planned procurement.

How Barker Can Help

Barker supports education clients with estate audits, digital readiness assessments and capital planning, ensuring estates remain safe, compliant and future-proofed.

Read The DfE Guidance

Prepare your education estate for the PSTN and ISDN switch-off. Read the guidance here.

If you’d like to discuss how prepared your estate is, get in touch with our education estates team.

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