I am in the process of expanding and I need to make a hole from the attic to the new house. The hole should be around 50 x 50cm, doesn't have to be precise.

How do I make a hole in the facade the easiest way? Angle grinder with a diamond blade? Reciprocating saw with a special blade?

In the attic, it's wood, then brick on the outside.

All tips are welcome.
 
Will the exterior be exposed to the elements where you are going to make the hole on the outside?
 
Nix will be the wind in the new construction..
 
I would probably have drilled out the grout and removed the stones in the affected area.
 
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