The old one was closed last year for safety reasons.
The slipway will cost up to one-and-a-half million pounds, with funding coming from the proceeds from the sale of Elizabeth Hall, the county council, and other sources.
The new slipway is a key part of Exmouth's regeneration and is expected to attract boat users from outside the area.
North Devon house fire treated as arson
Cornwall charity is sending aid to hurricane victims
Huge tuna caught off Devon breaks record
Devon and Cornwall Police gets another bad report
Fears for future of Torquay's custody centre
Will Barnstaple remain a port?
