I thought about doing this Jim but thought better of it.
Think it can lead to arguments with the custie they expect one price (a cheap one!) and you give another.
You could maybe give a guide say 3 bed semi starts from x amount.
When people ask me on the phone i say it will be between this and that price but i will need to take a look as i don't want to over quote the job.
This is where door knocking wins "do you need a windie"
"yes how much?"
your there you take a look and give them the price straight away.
I've seen guys on here with price calculators on their website which you enter the amount of windows and it calculates a price but it's all a bit risky.
I know what your trying to do as people want to know 3 things.
1) how much?
2) how often?
3) how do i pay you know when to open my gate.
Or is that 4
