I have some 4 weekly but most customers other prefer 8 weekly. I think a lot is down to cost. If I charged say £15 for that house, they may well prefer 4 weekly. There are some window cleaners in my area that charge £5 or so for a semi and they are 4 weekly. It's finding a balance between an acceptable hourly rate for me and an acceptable cost to the customer. In general the cost is prohibitive at 4 weekly. If any of my 8 weekly customers ask for 4 weekly, I don't reduce the price.I decided early on to go 8 weekly as customers weren't happy with the 4 weekly cycle at the prices I was charging (less than they are now). I bumped into BFG soon after I started and he advised the same. It seems to work around here.I'm building work about 10 miles away and there I have offered 6 or 12 weekly with a cost difference. I figure that enough go 12 weekly the hourly rate will be so good that it will make up for the lost time spent travelling.
Doesn't look hard. I would do it for £25. You must be slow, looks like 15 mins work