The reliable way to hire a tradesperson

We have an elica extractor hob. The ducting goes inside a low cupboard behind it and vented outside under the floor. The venting pressure of the fan has pushed off the ducting connection. This just seems to be connected with tons of tape. No male to female “click” connection points as mentioned for these hobs on Google. Any advice?

Is it possible to install a staircase for a loft conversion (bungalow) before the work upstairs starts? Reason is i want the stairs in to finish off the downstairs part before moving onto the loft next year. Obviously I won't be able to use them without the dormer above for head height etc and I have a separate loft hatch for access, but would like to fit them if only temporarily. Thanks

Thinking of buying house that was built around 1910-1930 and would look to covert the under stairs storage room into a WC if possible,Are their any minimum dimensions that are required to install one?and roughly what sort of prices would I be looking at getting it transformed?