The Bath and London-based practice has experienced a leap in profits from £1,658,712 in the year ending December 2005 to £2,256,006 recorded in March 2007.
Practice manager Chris Askew said: 'Although these figures are from a 15-month period, they would still be very good figures if looked at in a 12-month period.
'It has been a good year, which I think is down to the broad range of sectors that we are working in. It has meant we have been able to increase our staff profit share, as well as our charitable donations.'
FCB has had an exceptional year, and was perhaps unfortunate not to make the Stirling Prize shortlist with its £6 million Formby Pool project, which won a RIBA National Award in June.
This year has also seen the firm start work on the vast Bath Riverside regeneration project, which will provide 2,200 homes on one of the country's largest brownfield sites.
FCB has recently announced it has won planning consent for a £100 million mixed-use project in Hampshire, which will create more than 100,000m2 of commercial space as well as 2,500 homes.
Askew added: 'We have just had three big project wins, so the future of FCB is looking very secure.'