Affordable Pet Doors Melbourne installs the following cat doors which are designed specifically for timber doors. They have a plastic frame and are fully weatherproof. These doors also have a silent action and transparent flap:
For Small to Medium Cats:
Pig In Mud Standard Cat Door – $230 including supply and installation
Dimensions: 
- Door Size: 18.4cm x 19cm
- Flap Size: 15.9cm x 15.9cm
Features:
- Impact-resistant frame made of super-strong thermoplastic
- Unbreakable LEXAN flap with felt seal and magnetic close
- 4-way locking mechanism: Door Open / Door Locked / In Only / Out Only
- Tamper-proof mounting system means door can’t be removed from outside
- Inner telescoping frame adapts to doors from 32mm to 44mm (standard door) thick
(Yarra Valley / Mornington Peninsula – an additional $40 travel surcharge applies)
For Large Cats:
Petway Small Pet Door – $260 including supply and installation
Dimensions:
- Flap Size: 24cm x 19cm
Features:
- Lockout Slide included to keep pet(s) in or out
- Transparent hard flap lets pet see when lockout slide is in place
- Tamper-proof mounting system means door can’t be removed from outside
- Sturdy UV-resistant plastic frame and fully weatherproof
(Yarra Valley / Mornington Peninsula – an additional $40 travel surcharge applies)