Treework Environmental Practice explained that it was spreading out to gain a competitive edge with arboricultural services such as risk surveys, public inquiries and tree work.
The consultancy now works out of London and the Midlands as well as having its head office in Bristol.
Arboricultural consultant Mike Wood now works from Oswestry, Shropshire, to offer services to clients in the Midlands, northern England and north Wales. The rest of the team in Bristol covers south-west England and south Wales.
A practice representative said: "Clients can expect a local, more rapid response to ensure their needs are met at the time when most needed.
"Treework Environmental Practice now plans to expand its customer base in other regions and offer more local and cost-effective services."
He added that with tree consultants working more locally the company would be able to reduce its carbon footprint.