How to read this page
Pick the entry closest to the work you have in mind. It only has to be close enough for a business to recognise the job — the description you write matters far more than the label you pick, and most real projects touch two or three of these.
Where a length of time appears, it is the kind of range a business may mention on a first call, not a commitment by anyone. Only a business that has seen the property can give you dates, and only after it has measured. Permit periods sit outside all of it: the municipality sets those, and they are best kept separate in your head from time on site.