I'm frightened by the cost of double glazing my flat, so I'm looking at buying 2nd hand windows and doors and fitting them myself.
My back (french) doors are 1920mm wide and 2500 high. In addition the bricks above the window make a stone arch.
Looking online it seems I won't be able to get a door to just fit.
How possible is it for me to get a smaller door and 'fill' around the edges?
If so, what would be the maximum size gap I could have? Could I build some wood structure that filled a foot on each side for example?
Cheers in advance