Bosses at Donington Park in Leicestershire are planning to build a new pit complex ahead of the British Grand Prix at the circuit from 2010.
Work will begin in the autumn and the new facility will feature a race control centre and a media centre.
Donington Park spokesman David Fern said that a "totally new complex will be built with all of the pits fitted out to the latest specifications".
The track will also be lengthened to three miles (4.8km).
'Spectacular' improvements
The £3m pit and paddock, built three years ago, will remain largely intact.
Mr Fern said the lengthened track would include "a spectacular sweeping curve" with a computer-simulated lap of 77 seconds that would allow cars and bikes to travel at speeds of up to 200 mph (322 km/hr).
The construction work will start at the end of the racing season.
Donington Park chief executive Simon Gillett said about £100m would be spent on overall improvements at the circuit.
Donington Park has hosted the British Motorcycle Grand Prix since 1987 and will take over the British Grand Prix from Silverstone in 2010.
The track last hosted a Grand Prix race in 1993 when Ayrton Senna won the race.
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