.. Getting outside

How about upstairs?

Maybe the access to the roof is closed down.

Maybe it would help if you would get access to the blueprints of the house. ( Get into the safe. )

Look at them, then!

There is a weak spot in the bedroom now that you can interact with. ( You really have to look at the blueprints, first. ) It is the wet looking spot in the roof. Break through it.

Now, climb up there.