on one hand ..same as stu mac....its a grotty job...so put in a price thats worth it.....i try to never buy work i dont want....pricing low on this is shooting yourself in the footon the other hand...if its a regular job that you value...maybe price reasonably to keep them happy...if you dont, they may well look eldewhere for someone who will do it cheap...and then you MAY lose the windows all together!!