Do Bunnings have a workshop on how to build nest boxes for possums and native birds?
It has plans for different nest boxes specifically designed for dozens of different Australian bird and marsupial species.
Different birds and animals often have very different needs in a nest box. Some of the things you need to consider include the size of the hole (to keep predators and competitors out); whether you need to have a "ladder" of grooves in the wood inside the nest box for the birds to climb up; how to keep water out; how to position it so it doesn't get too hot; and the need to ensure that there's nothing toxic in the timber and other products you use. The little nesting boxes you sometimes see in pet stores generally aren't suitable for native birds.
What sort of birds and possums are you hoping to attract? I've put up a nesting box for lorikeets or other small parrots, but no luck yet...
Welcome to the Bunnings Workshop community @Irene2. It's great to have you join us, and many thanks for your question about building a nesting box.
I've put together a rendering of a possum box I built alongside Wires and with the assistance of the Men's Shed. I think we made over 50 of them. We stapled mesh inside the box to allow exit. It's a relatively simple design that can be made from marine-grade plywood and then coated with exterior water-based paint.
If you are interested in checking out the upcoming D.I.Y. in-store workshops, you can see those on the Bunnings website. Alternatively, please speak with your local store's Activities Organiser and let them know you're interested in a nesting box workshop.
Please let us know if you have questions.