i know it is difficult without measurements but roughly how much for replacement d/g windows on standard victorian terrace

It's very difficult to say without having the actual measurements and style of windows, ie- how many openers do you want? and is there any toughened glass required anywhere? And when you say 'sash style' do you mean vertical sliders or mock horned sashes? Someone would really need to take a look before committing to a price.

£2500-£3000 going on a average size bay and windows,in whiite and it will depend on the area you live in ?

We by all means can give you a quote using the internet and if you can give us a house number and postcode. This way we can see an image of the front of your house and price for supply and install. Many Thanks Barry Major Glass and Glazing