For most small businesses, the average cost of a modern phone system typically ranges from around £15–£30 per user per month for hosted VoIP or cloud PBX services, plus any one-off setup or hardware costs. On-premise PBX systems, where the equipment is installed at your site, usually involve a larger initial investment, often from £1,000–£3,000 for very small deployments, scaling upwards with more users, advanced features, and higher-grade hardware. Beyond these headline figures, the true cost depends heavily on how many users you have, whether you need desk phones or will use softphones, the level of support included, and whether you require integration with CRM or other business applications. Installation, cabling, broadband quality and contract length also play a role in the final price you pay.
The main factors influencing pricing are the type of system (on-premise PBX, hosted PBX, or hybrid), the features you select (such as call recording, call queues and reporting), and the resilience and support you require. Small businesses with straightforward needs and a stable internet connection can often keep costs low by using cloud telephony with minimal hardware. Organisations needing higher reliability, complex call routing, or multi-site connectivity may pay more but gain greater control and scalability. Understanding these cost drivers helps you compare quotes fairly, avoid unnecessary extras, and choose a solution that balances budget with long-term flexibility and reliability for your organisation.
The type of PBX platform is usually the biggest cost driver. Hosted or cloud PBX solutions are generally billed per user per month, with inclusive call bundles and support, making budgeting straightforward. On-premise PBX requires a higher upfront capital spend on equipment and installation, but ongoing monthly costs can be lower, particularly for stable, long-term setups with many users.
Features and functionality also significantly influence pricing. Basic packages may include standard calling, voicemail and simple hunt groups, while more advanced options such as call recording, interactive voice response (IVR), wallboard reporting, CRM integration and mobile apps often add to the monthly fee. Licences for these features are typically priced per user or per channel.
Finally, connectivity and support must be factored in. Reliable broadband or dedicated connectivity suitable for voice traffic, structured cabling, and professional installation can add to initial costs. Ongoing maintenance, remote monitoring and local engineering support are usually reflected in monthly service charges but can reduce downtime and unexpected repair expenses.
