Totally agree Paul Coleman, so many fall foul of not realising what costs are involved.
No matter what money you earn, always put 25% away for tax and NI and don't touch it.
Steve Kiff: You have started picking up customers at the hardest time of year, so well done for that. If you can do it now, it will be so much easier come the spring.
We all know how it is when you start and yes you go cheap to get work, but as Paul says you have to be realistic.
£8 per house x 200 = £1600 x11(if monthly cleans)=£17600 take off tax, business overheads etc etc and look at what you have left to pay your household costs....not a lot

add on just £2.00 per house
£10 x 200=£2000 x 11 =£22000, just for £2.00 extra per house you have over £4k more.
£10 for a 3 bed semi is still a really good price for the customer.
A tip for the spring, when quoting for people and they say I did have a cleaner, but haven't seen him since October, add £2 to the price you had in mind. If they say that is more expensive than the last one, just say yes but I provide an all year round service and don't let you down in the winter. You can always come down on price if you want to, but very rarely get the oppotunity to go up!
