Doggy door/pet flap installation

[J@ED]

Hello,

Hoping to find someone to install a pet flap for dogs in a wooden back door. There is already a small pet door installed, but I will need it replaced with a bigger, medium sized one due to the size of my Frenchie and Jack Russell.

I already have the appropriate size pet flap, I?m just looking for someone to install it.

Please lmk price and availability?

I?m based in Crystal Palace Rd, East Dulwich. (& if you?re open to it, I also have a sister that needs a cat flap put in a couple of roads down!)

Looking forward to hearing from you,

Jane