Mmmm....Well I think it all depends on the work involved, we still haven't been told how many windows this property has, or the type and size of the windows.
In most parts of the country, £30 for a medium sized house would be very expensive, but if you are trad and it has about 16 or 17 georgian windows then £30 quid wouldn't be particularly expensive at all.
WFP different of course because there is little time difference between cleaning a georgian window and a normal casement window.
Was the original window cleaner trad? Was his price including washing down all the frames, doors and so on?
For me, a £13.00 house would have to be cleaned (without racing or rushing) in a maximum of 13 minutes.
And if it is a stand alone house, that 13 minutes starts from getting out of the van to getting back in it when I've finished.
And that does not mean I earn £60 an hour all day long, all week long either, but this isn't the thread to go into that...
Ian