Before I was a window cleaner I was in the Army, posted not too far down the road from here. Anyway; the whole camp married quarter area didn't have a window cleaner so after a few phone calls I pinned a window cleaner down.
He said he didn't do my area.
I told him I'd pay him double.
He said, 'no'.
I said, 'treble' for a one off clean. He said okay.
I asked how much.
He wouldn't tell me till he saw the property.
Eventually he turned up, said six pounds, so I agreed £18 (I acutally paid him £20).
But my point is, I was slightly worried that he might go over the top and really try and stick the price on me. You hear so much about 'rip off Britain' and 'dodgy tradesmen'.
I don't think it would hurt to say the average cost for my bog standard, three bedroomed semi, without leaded or georgian windows and without a conservatory is £X amount, and if their house is bigger or more difficult, they'll be charged more.
If, at that point they think you're too expensive, you've saved yourself a journey. If not, at least their minds are put at rest.