The door between the garage and the living area of the house, generally is required to be a 1 hour fire rated self-closing door. The reason for this is that fires often start in the garage because of paint cans, gas cans for the mower, chemicals or stored items that are fire safety concerns.
Self-closing hinges are designed to close the door automatically once a person turns loose of the door. They are easy and inexpensive to install. Should a self-closing hinge already exist, it may need to be replaced or just merely adjusted. Occasionally the door or jamb needs adjustments to allow the door to easily and fully close.
If not closing properly – there may be other reasons
When adjusting the door or hinges does not work, then start looking for other reasons, such as too much paint on the door. Doors that have been repainted a number of times over the years get a build-up of paint on the edges and jambs which can cause a door to stick. This may need to be sanded down. Also remember that there may be a number of other reasons. ( READ ABOUT OTHER CAUSES OF DOORS STICKING OR NOT CLOSING PROPERLY )
Who to consult? Finish carpenters, door hangers and qualified handymen.
DIY home owners may adjust or add self closing hinges on their own doors. Door hangers, finish carpenters and qualified handymen are the most proficient at working on doors.