By and large you should manage to get 3 houses an hour cleaned, I am not talking about a dozen accounts all in the one street, I'm allowing for a bit of traveling involved too.
Am also refering to the standard 3 bed semi, UPVC frames and no conservatory.
So 15 minutes to clean one of them, and a couple of minutes traveling to the next one, and so on.
My own minimum for cleaning such a house would be £8.00, so that would give me the £24 per hour being mentioned.
But as Ross has said, life doesn't work like that
In an 8 hour day you would think 'Great!' close to £200 a day!!
Too many variable factors come into play, and you will probably only work, and I mean ACTUALLY work, about 6 of those 8 hours, traveling, setting up, talking to customers, invoicing, dinner breaks and so on will take up time.
And don't forget down time due to the weather, or the time taken to go and get a new tyre fitted! Or going off to use the loo, or the days when you are just not firing on all cylinders.
Potentially £24 per hour is more than feasible, but you have to get your prices right, and that can depend on your location. If you are working low income estates, getting good prices won't be easy. But if you are in the Essex area, then you are certainly in a more affluent part of the country.
Pick area's that reflect that fact and your base price should be closer to £10 or £12 per standard house.
Regards,
Ian