Cost to install cat flap in external wall ?

[cyberknight]

this is what im dealing with patio door then glass full door into house , the wooden door i not linked to the the house if i bought the house
only external wall that has a place to put a flap is in the bit on the back right which is a toilet

 

[ozboz]

Why would you need to knock a hole in the wall to have a flat cap ?

 

[Deleted member 26715]

We just leave the bathroom window open

 

[furball]

What kind of scruffy establishment are you running ? Surely that's the footman's job

Ssshh don't tell my cat that

 

[Milkfloat]

The only way to put a cat flap in the patio door will be with new glass. The glass is toughened so cannot be cut without exploding. Go through the door.

 

[oldwheels]

We used to have a cat door in a kitchen window before double glazing but when the cats got a bit infirm and unable to jump up easily I simply knocked a hole through a cavity wall at floor level and put a tunnel in with the cat flap on the outside and a removable door on the inside. The inside door was normally left open and the cats had no problem.
Now with no cats and a tumble drier the vent hose fits nicely through and vents outside the house.

 

[vickster]

I should think @cyberknight cat has tunnelled its way out by now in great escape stylee as the thread is 2 years old