East Anglian firms Cunningham John and Few & Kester will merge in July to create a 23-partner firm.
The combined firm, to be known as Kester Cunningham John, will also open a four-partner commercial office in Norwich.
Cunningham John currently has 14 partners across offices in Watton, Thetford and Bury St Edmunds, while Few & Kester has seven partners based in Cambridge.
The merged firm will have 90 fee-earners in total.
Cunningham John's principal client base lies in construction and development, energy and waste recycling, while Few & Kester performs general commercial work and acts for a number of Cambridge colleges.
Cunningham John is also well known for its clinical negligence practice.
Cunningham John senior partner Simon John said: 'We are two firms with a variety of different client bases, but we fit very well.
There will be some staff movement between the offices but no one will be leaving as a result of the merger.
It is not a cost-cutting exercise.'
He added: 'The new firm will be the only regional - as opposed to national - firm with offices in both Norwich and Cambridge.'
Rachel Rothwell
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