Efforts to protect Brisbane's rare red-brick schools may see three inner-city schools added to the Queensland heritage register.

The schools, located in Ashgrove, Morningside and West End, are all made out of red bricks, a rarely used construction material at the time of their construction.

If the schools are successfully added to the Queensland Heritage Register, any proposed changes, additions or construction of new buildings will be assessed under a set of criteria for heritage buildings.