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How Much do Replacement Windows Cost?

buyers guides

Your guide to window designs


“how much do replacement windows cost?”

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When should I consider replacing my windows?

Replacement windows come in various styles and types, each with its’ own set of pros & cons. Many, purposely, have significantly different specifications in their design, and these elements combine to assist each type of window meet different client needs.

The windows in your home will wear out over time due to the effects of “fatigue”. This could be down to being heavily used or damaged. If you have timber frames, the wood itself could have started to deteriorate from rot or mold, really old uPVC models may have discoloured.

Homeowners these days also need to provide an Energy Performance Certificate (EPC ) this is compulsory to have if you want to sell or rent your home at any point.

The EPC is all about how efficient your home is at using energy, and one of the biggest contributors to poor energy efficiency are old windows & doors – so it may be that replacing your windows is essential to meet an acceptable EPC rating requirement.

In any event, for whatever reason you choose to replace your windows, here are some of the options in the current market.

Features all replacement windows should have in common

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window energy ratingsIrrespective of the style of the design, these are features that would be common to all good replacement windows.

  • Double or Triple glazing – who would fit a single glazed window to a property these days anyway? (probably only where a person is compelled by a planning department would this happen).
  • Energy efficient frames – uPVC versions would have multi-chambered frames; aluminium would have “thermal breaks”. Timber is naturally a good insulator.
  • Trickle vents – highly insulated homes can suffer from condensation build-up. Trickle vents allow controlled ventilation to manage this problem.
  • Internal window beads – these are the strips around the edge of the glass pane which clip into place and hold the glazed unit in position (this would have been putty in the “old-days”). Placing them on the inside stops an intruder from easily removing the window pane in order to enter your home.
  • Locking handles – on the window handle, have a key lock of some type.
  • WER label – this is the Window Energy Rating. It denotes the overall grade of the complete window (not just the glazed part). Rating run from A++ to G with G being the lowest grade. C grade is likely to be the lowest level acceptable to meet UK building regulations. Labels are provided by either The BSI or BFRC.

What are the different types of window designs?

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Casement Window

How much do double glazed windows cost?Probably the style that comes to mind first when thinking about what a replacement window looks like.

The word casement is actually related to the moving (opening) section which opens outwards. The standard casement window opens from hinges on the left or right. A hopper version will open inwards from hinges on the bottom. An awning version will open outwards from hinges at the top.

When fitted side by side in a single frame, you get a French Window.

Prices for a single, side opening, double glazed, white uPVC casement window sized 1000mm x 1000mm, would be in the region of £200 to £300.

Sash windows

A double glazed sash & tilt windowA typical sash window will feature 2 moving panels (casements), 1 set above the other. The sash windows move vertically up and down, one on an inner track, one on an outer. They slide past each other in order to open and therefore you can only have “half the window open” at any point.

Where only one sash moves they are called single-hung, where both move they are referred to as double-hung. In single-hung versions, only the lower sash will move.

The lock for a standard sash window will be in the centre where the two sashes overlap. It is important to have a good quality lock here.

How Much do Replacement Windows Cost?Bay & Bow window designs

bay & bow windowsThe main feature of bay & bow window designs is that they “project” from the house.

Bay windows are usually a 3-faceted projection, within which the 2 side facets set square or at an angle. Typically, the bay itself will extend from floor to ceiling. If you are planning to create a new bay window then it will require a base & a roof, which can make them quite an expensive type of window to “build from scratch”. A replacement bay window set might cost around £1,500 for 3 panels (2500w x 1500h) in white uPVC

On the other hand, a bow window is a “1-sided” curve and can be fitted into an existing opening if the opening is wide enough to work well with a bow design.

Whilst not needing a base & roof like a bay, you will need to consider what you do at the cill & head of the window to weatherproof the installation. You could expect to pay £1,000+ for a 5 section white uPVC bow window.

Tilt and turn windows

tilt.turnA quirky and unique design style, that combines an opening mechanism similar to a standard casement style with the ability to also tilt the same window section inwards for ventilation. Both opening variations can be done using a single multi-function handle.

However, the moving window sections open into the house, which can sometimes cause interference with curtains or blinds, depending on how & where these are fitted to the window area.

One of the plus points of this style is that, because they open inwards, they are easily cleaned from inside the house – very handy for upper floors. They also open really wide and therefore lend themselves well for use as an exit in the event of an emergency.

Other versions also include tilt & turn sash windows or reversible windows. You could expect to pay between £250 to £350 for a 1200mm x 1200mm supply only tilt & turn window in white uPVC or £500 to £550 for a fully fitted 1200mm x 1200mm white uPVC tilt & turn window.

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Replacement Window options

All of these different designs are available in different materials with optional features such as:

  • get online double glazing pricesTimber – softwood, hardwood or engineered wood.
  • Aluminium
  • uPVC
  • White or coloured for aluminium or uPVC.
  • Smooth or grain surface for uPVC & aluminium.
  • Patterned, leaded, obscure or coloured glass.
  • Sealed unit size from 6mm to 20mm.
  • Toughened safety glass.
  • Energy efficient, Argon gas filled or low-e double glazing.
  • 10-year guarantee.
  • Window bars or mullions, window inserts.

How much do replacement windows cost?

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Here is a brief summary of some prices for replacement windows – please bear in mind these are just to give you a general idea of the likely cost and the actual cost of any replacement window could be more or less than this – Always have a professional to do a free survey & provide written quotes for the work to get an accurate price.

Type of Window & Approximate Size Basic Specification  Average price guide 
Single Opener Casement: 600 mm x 900 mm Double Glazed White uPVCfrom £200 to £300
Single Hung Sash Window: 1000 mm x 1200 mmDouble Glazed White uPVCfrom £700 to £900
Tilt & Turn Casement: 1200 mm x 1200 mmDouble Glazed White uPVCfrom £500 to £550
 3 Section Bay Window (casement)Double Glazed White uPVCfrom £1,000 to £1,300

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William Henderson
William Henderson
William is a long time blogger for home improvement articles in the UK.