Roller blinds are the most common thing we fit and the easiest to get wrong. A blockout that leaves two bright lines at sunrise, a tube too light for a four metre span so the blind bows in the middle, a chain on the wrong side of a doorway. None of that shows up on a price list.
We make our roller blinds in our own Sydney factory, so these articles are written from the bench as much as from the van. They cover how to measure an opening properly, what separates a blockout from a sunscreen in a west facing room, how deep a reveal needs to be before a cassette will fit, and when a motor earns its keep over a chain.
If you would rather talk it through at the window, that is what the free measure is for.