If you have an open roof type opening, it will always be easy for such predatory birds to enter.  because the owl is a heavy bird, it will need to fly low, near to the floor. Set up fine fishing nets to capture them and release into a padi field far away.  If your house is near a padi field, then it'll be tough as owls are introduced into padi fields to help keep the rat population down.

If you have a window type entrance, owls always need to perch before entering. You can electrify the opening with a high voltage source from a fly zapper. The fly zapper has about 4000volts and very low amps which will NOT kill the owl but give it a very bad experience enough to deter it from coming again.

Spikes and motion activated lights will also work but they do get smart. Horizontal bars about 8 ins. apart will also prevent them from coming into the house.

Electric gates also work but sometimes they fail and swiftlets get trapped inside the house if they are not opened by sunrise.  External lights all night long also help keep the owls at bay.