The former library site at Bradpole Road in Strouden Park will be turned into a new community centre and eight affordable shared-ownership houses.
Up to 10 affordable homes for rent will be built on land in Craigmoor Avenue.
Bournemouth Borough Council voted in favour of the scheme by Signpost Housing Association and a planning application can now be submitted.
Councillor Peter Charon said: "The development of these underused sites will provide quality affordable housing and a modern community centre for the benefit of the Strouden Park area."
The association ammended its original plans for the site after proposals went out to public consultation last year.
There will now be no flats constructed at either site and the community centre will be built on the Bradpole Road site, not Craigmoor Avenue as previously proposed.