The Impact of the PSTN Switch-Off on Property: Act before Services Cease to Function

In my discussions with building owners and occupiers about property technology, the conversation often centres on leveraging new technologies and existing data to enhance compliance, reduce costs and carbon emissions, and improve workplace experience.

Many people in the property sector share a common concern around the quality of data currently held on their buildings. This gap in record-keeping could pose significant challenges as the UK's Public Switched Telephone Network (PSTN) is retired in early 2027.



PSTN is the analogue telephone network that carries voice and data over copper wires. This legacy infrastructure is becoming increasingly costly and difficult to maintain, and it is unable to handle the data demands of modern telecommunications. As a result, BT and other UK phone companies intend to withdraw PSTN services by the end of January 2027. 

Although records may not show it, many buildings rely on PSTN lines for critical services such as lift emergency calls, fire alarms, security systems, door entry monitoring and building management systems. Once PSTN is decommissioned, these services will cease to function without warning, potentially leading to safety compliance and security risks.

To mitigate these risks, building owners should proactively assess their exposure before PSTN services are discontinued. Identifying and replacing existing PSTN connections with future-proofed, and potentially more cost-effective, digital solutions is essential for business continuity. Building occupiers should also seek assurances from their landlords regarding these transitions.

At the Connected Britain Conference last year, the Minister of State for Data Protection and Telecoms, Sir Chris Bryant MP, highlighted the vital importance of digital infrastructure and cited the PSTN switch-off as a significant concern. 

BT recommends that its business customers act before the end of 2025. The transition to digital alternatives including testing and commissioning could take 6-9 months. A critical first step is to carry out an audit to identify systems that rely on PSTN. This audit should identify all devices connected to the PSTN, their locations, their functions, and upgrade options.

I have been urging property owners and operators to develop and implement a programme of discovery and rectification as a priority. Without early and rigorous planning, the risks to safety, business continuity, and occupier experience are high. Also, as the switch-off date approaches, the costs of this work are very likely to increase significantly. 

Cambridge Management Consulting has a team of PSTN experts, who can identify existing PSTN-based systems, procure replacement solutions and migrate your services, as well as identifying and implementing cost reduction strategies that become possible through the transition to digital solutions. We can also ensure your organisation avoids the risks to compliance, security and occupier experience when PSTN services are withdrawn as well as reaping the long-term benefits of going digital.