Windows
Replacement windows
Replacement windows in the UK cost roughly £400 to £1,800 each supplied and fitted, depending on material and style. uPVC is the cheapest, aluminium gives the slimmest frames, and timber is usually required on listed buildings. All replacements must meet a U-value of 1.4 W/m²K or Window Energy Rating band B.
Two decisions drive almost all of the cost: what the frame is made of, and how the window opens. Everything else is detail. Start with the material, then pick the style that suits the building.
Every window type, and what each one costs
Ten frame materials and opening styles, each with the published price band for a single window supplied and fitted. Start with the material if you know it, or the style if you are matching what is already there.
- The default choice
uPVC windows
uPVC windows cost £400 to £850 fitted.
£400 – £850
fitted, guide only
- Slimmest frames
Aluminium windows
Aluminium windows cost £600 to £1,250 fitted.
£600 – £1,250
fitted, guide only
- Listed and conservation
Timber windows
Timber windows cost £800 to £1,600 fitted.
£800 – £1,600
fitted, guide only
- Most common UK style
Casement windows
Casement windows are the most common UK style and the cheapest to replace.
£400 – £850
fitted, guide only
- Georgian to Edwardian
Sash windows
Sash windows cost £800 to £1,800 fitted.
£800 – £1,800
fitted, guide only
- Flats and upper floors
Tilt and turn windows
Tilt and turn windows open two ways: a secure vent, or fully inwards for cleaning and escape.
£400 – £850
fitted, guide only
- Often structural
Bay and bow windows
Bay and bow windows cost £1,500 to £3,000 fitted because many carry structural load.
£1,500 – £3,000
fitted, guide only
- Period look, modern frame
Flush casement windows
A flush casement sits level with the frame for a traditional line.
£400 – £850
fitted, guide only
- Comfort and noise
Triple glazing
Triple glazing costs £450 to £1,600 per window fitted.
£450 – £1,600
fitted, guide only
- Best for noise
Secondary glazing
Secondary glazing fits inside the existing window.
£400 – £1,800
fitted, guide only
Choosing
Choosing in the right order
Decide the material first, because it sets the budget and is the decision a conservation officer cares about. uPVC is the default, aluminium buys slim frames and large panes, timber is usually compulsory on listed buildings.
Then decide the style. Casement covers most UK houses, sash is correct for Georgian through Edwardian, tilt and turn suits flats and upper floors, and bay windows carry structural load and need designing accordingly.
Only then worry about glazing. Triple glazing is a real improvement but a smaller one than it is usually sold as, and in a listed building secondary glazing may be the only route open to you.