depends what u charge,if u are chargin fairly at £1 a window,and sum1 comes along and says i'll do it for 50p then fair enuff,but if u charge £10 and sum1 does it for 8-9 quid,it not that bad of an undercut,different wc have different charges,sum want to earn £40 a hour,sum are happy with £25,but i dont agree with askin how much the other wc charges and then undercuttin on purpose,that is wrong,but if a custies asks how much u charge even tho they have a window cleaner and u charge less than the current window cleaner without knwin wat he charged b4 u quoted,then theys nothin wrong with that. they alot of wc were i live who believe in it bein 'my patch' and that is stupid,coz wen we do a street we dont do every single house on it usually,and if the current wc ant bin bothered to knock on the houses that he dunt do and try to give em a quote,then it is own fault,but anyways,it a crazy buissness sumtimes