I have a question. If I built a granny flat at the back of my land and want to place a covenant which prohibits any future owners from building more than a single storey dwelling house, how would I incorporate this into my title?

If you build a granny flat at the back of your land, and you keep the granny flat as part of your land, you would control any use of the land including modifications to the granny flat. If you plan to sell off the granny flat section of your land and create a new parcel of land with the granny flat on it you would need to speak with your local solicitor first before you start doing anything. You should get legal advice on anything involving a proposed covenant on your land.