You will have difficulty finding a bona fide builder who will do the
work without a scaffold these days (H&S looms it head) and the builder
is not going to front the scaffold cost which might be about £500

I was interested to find you can get a used Transit with a cherry picker for
a few grand. Obviously this won't have the "reach" for all jobs but it
struck me as a useful investment if one were doing a major refurbishment
where the access was OK.