Littlewick Green Motor Group has added the Suzuki franchise at its Bath Road site in Maidenhead.
Maidenhead Suzuki will move to a purpose built showroom opposite the current Littlewick Green site in 2013.
Ian Govier, dealer principal at Maidenhead Suzuki, said: "The brand gives us Japanese reliability at a price point that has not been available to our customers before."
Littlewick Green has been established in the Maidenhead and Slough area for more than 50 years.
In addition to its new Suzuki business it is also a Honda and Daihatsu dealer and an authorised repair centre for Mazda.