Gazza, I know you have asked for an average per house. But the figure has no relevant value or merit in the practacalities of a w/c buisness. IE,
You could clean 20 houses earning you £100.00, £5.00 an house.
10 houses earning you £100.00, £10.00 an house.
5 houses earning you £100.00, £20.00 an house.
1 house earning you £100.00,
Now for me the highs on the lows of the example above would be, 1 house = less collecting then 20 houses, a big time saver at work and going out collecting.
The big advantage of the 20 houses is if you lose a customer its only £5.00 to lose. If you lose a £100.00 house its a lot of money to lose.
I can see practiclities in looking at how prices make up a domestic round. but I cannot see any practical value in an average price.
Hope that makes it clearer.
Nel.