Hi Marylin,
I don't know of many people do house cleaning
as well as window cleaning, as window cleaning requires special equipment. But I suppose there's no reason why you couldn't.
Have a look at this post under the title "Start-up Kit"
for what you'll need:
http://www.cleanitup.co.uk/cgi-bin/yabb/YaBB.pl?board=Startingwindowcleaning;action=display;num=1074807575I would estimate, just for window cleaning, your initial cost would be about £300 for the conventional equipment of ladders etc, or about £1300 for a portable 'water-fed pole' system.
If you intned to concentrate mainly on house cleaning but want to include window cleaning with that as a little selling point, you could come to an arrangement with a local window cleaner, or else buy a very small 'domestic' wfp system for aboout £120. I know a supplier of these little systems if you're interested.
Silly