Reply To: Cost to repair retaining wall on common property and unit boundary › Flat Chat Strata Forum › Common Property › Cost to repair retaining wall on common property and unit boundary › Current Page 21/02/2024 at 1:14 pm #72808 chesswoodFlatchatter If it’s a wall, it should be wholly on the higher land and in your case that is the responsibility of your OC. If it’s on the border, then it’s a fence and I’d guess it’s common property and again the responsibility of the OC.