Opus Telecoms has relocated to new offices in Reigate and closed its bases in Wimbledon and Sevenoaks. The central London and Hitchin sales offices remain operational.
The consolidation enables Opus to host customer seminars and workshops, and streamline collaboration between directors and staff.
The board sees the move as a key step in Opus growing its turnover to £20m by 2020.
Opus MD Michael O'Donnell said: "The Opus group has grown considerably over the past few years and as our portfolio and size of customers grow it is important that we are in a position to continue to deliver the service our customers expect. The consolidation of our offices will enable us to do this."
Opus was founded in 1992 and is a Mitel Gold Reseller partner, holds two Gamma Platinum Partner accreditations and is a Microsoft Certified Partner.