These are ballpark figures rather than fixed prices. Current UK cost data places a typical twelve-window UPVC installation for a three-bedroom house at approximately £7,500, although the final price can be considerably higher or lower depending on the specification.

​

​

What Affects UPVC Window Costs?

​

Window size

Larger windows require more frame material, glass and reinforcement. They may also need stronger hinges, additional fixings and more installers to lift them safely.

​

A small bathroom window will generally cost less than a wide bedroom window containing several opening sections.

​

Unusually tall, curved, arched or shaped frames normally cost more because they require bespoke manufacture.

​

Number of opening sections

A fixed pane will usually cost less than an opening window because it contains fewer components.

​

The cost may increase where the design includes:

​

• Multiple opening casements

• Top-hung fanlights

• Fire-escape openings

• Tilt-and-turn mechanisms

• Window restrictors

• Additional locking points

• Reinforced hinges

​

Two windows with identical external dimensions may therefore have different prices because one is fixed while the other contains several opening sections.

​

Standard or flush casement design

Standard UPVC casement windows have opening sections that project slightly beyond the surrounding outer frame.

​

Flush casement windows are designed so that the opening sash sits more closely in line with the frame when closed. They provide a cleaner appearance and can be particularly suitable for modern houses, cottages and traditional-style homes.

​

Flush frames usually cost more than standard casements because of their profile, manufacturing and hardware.

​

Double or triple glazing

Most new UPVC windows are supplied with double glazing. Triple glazing contains an additional pane and sealed cavity, making the unit heavier and generally more expensive.

​

The most suitable option will depend on:

​

• Existing window performance

• Exposure and orientation

• Required energy efficiency

• Outside noise

• Frame strength

• Available budget

​

A well-specified double glazed window may provide a better balance of price and performance for many homes.

​

Glass specification

Specialist glass can increase the UPVC window price.

​

Options include:

​

• Toughened safety glass

• Laminated security glass

• Acoustic glazing

• Solar-control glass

• Obscure or patterned glass

• Decorative and etched glass

• Georgian bars

• Leaded designs

• Self-cleaning coatings

​

Safety glazing may be needed in doors, low-level windows and other vulnerable locations. Bathrooms and entrance areas may require obscure or decorative glass.

​

Frame colour and finish

White UPVC is generally the least expensive finish.

​

Grey, black, cream and coloured frames normally cost more. Woodgrain foils can recreate the appearance of painted or stained timber but also carry an additional cost.

​

Dual-colour frames, with one finish externally and another internally, may cost more again.

​

The price difference should be confirmed across the complete project rather than assuming that every coloured window carries the same premium.

​

​

UPVC Casement Window Prices

 

Casement windows are among the most common window styles used in UK homes. They can be side-hung, top-hung or divided into a combination of fixed and opening sections.

​

Basic fitted UPVC casement windows may start at around £350–£520, while larger or more highly specified double glazed casements can fall between approximately £500 and £1,250.

​

The price will depend on:

​

• Window dimensions

• Number of openers

• Frame profile

• Glass type

• Locking system

• Colour and finish

• Trickle ventilation

• Safety requirements

• Installation access

​

A small fixed casement will usually sit near the lower end of the range. A large coloured window with several openers, laminated glass and specialist hardware will cost more.

​

​

UPVC Sash Window Costs

 

UPVC sash windows recreate the vertical sliding operation of traditional timber sash windows.

​

They contain more frame sections and moving components than standard casements, so they generally cost more.

​

Current cost guides indicate:

​

• Small white UPVC sash window: approximately £520–£625

• Larger white UPVC sash window: approximately £600–£720

• Small wood-effect sash window: approximately £625–£720

• Larger wood-effect sash window: approximately £700–£800

​

Broader supply-and-fit prices can reach £1,200 per window where the units are larger or include more detailed heritage features.

​

UPVC sash window costs may be affected by:

​

• Window dimensions

• Spring-balanced mechanisms

• Georgian glazing bars

• Decorative sash horns

• Deep bottom rails

• Woodgrain finishes

• Tilt-in cleaning facilities

• Toughened or laminated glass

• Heritage-style frame profiles

​

UPVC sash windows can provide a traditional appearance with less maintenance than timber. However, they may not be suitable for every listed building or conservation-area property.

​

​

UPVC Bay Window Costs

 

A bay window projects beyond the main wall and usually contains three or more connected window sections.

​

The cost is higher than a flat window because the installation may require:

​

• Several individual frames

• Reinforced corner posts

• New cills

• Structural support

• Insulation around the bay

• Roof or canopy repairs

• Internal boarding and plastering

• External trims and sealants

​

A conventional three-section UPVC bay window may cost around £1,200, while larger or more complex bays can range from approximately £1,100 to £4,000.

​

The installer should establish whether the existing frames support masonry, roofing or floors above. Temporary support and structural components may be needed before the old windows are removed.

​

The quotation should clearly identify whether structural work and making good are included.

​

​

Whole-House UPVC Window Costs

 

The cost of replacing all the windows in a home depends more on the individual openings than the number of bedrooms.

​

A three-bedroom property might contain:

​

• Eight simple casement windows

• Twelve smaller windows

• A large front bay

• French or patio doors

• A mixture of casement and sash windows

• Difficult upper-floor access

​

Current estimates place twelve UPVC casement windows at around £5,000–£10,000, with an average near £7,500.

​

Replacing several windows as one project may reduce the average cost per unit because the survey, manufacturing, delivery and installation can be organised together.

​

A whole-house quotation should contain a schedule showing the size, opening arrangement and glass specification for every window.

​

​

Coloured UPVC Window Prices

 

Coloured and wood-effect windows normally cost more than standard white frames.

​

Available finishes may include:

​

• Anthracite grey

• Black

• Cream

• Chartwell green

• Agate grey

• Irish oak

• Rosewood

• Painted timber effects

​

The extra cost will depend on whether the finish is applied externally only or to both sides of the frame.

​

A coloured UPVC casement measuring approximately 1,000mm by 500mm has been priced at around £350 in current cost data, while coloured sliding sash windows can average around £750.

​

Colour should be selected carefully because the windows affect the appearance of the entire elevation. Planning restrictions may also apply to listed buildings, flats and some conservation-area properties.

​

​

Does the Price Include Installation?

 

Some published UPVC window prices include supply and fitting, while others relate only to the manufactured window.

​

A complete installation quote should explain whether it includes:

​

• Property survey

• Manufacture of the windows

• Delivery

• Removal of existing frames

• Disposal and recycling

• Installation labour

• Handles and locks

• Trickle ventilators

• Internal trims

• External sealants

• Basic making good

• Certification

• VAT

​

A straightforward like-for-like UPVC replacement may involve labour of around £80 per window before the cost of the product itself, although access and complexity can increase this figure.

​

Scaffolding, extensive plaster repairs, structural work and final decoration are often priced separately.

​

​

Replacing Glass Instead of the Complete Window

 

Misting between the panes normally indicates that the sealed double glazed unit has failed.

​

Where the UPVC frame remains sound, it may be possible to replace only the glass rather than the entire window.

​

Glass replacement may be suitable where:

​

• The frame remains secure

• Hinges and locks operate correctly

• The window is not distorted

• Seals can be renewed

• There are no serious draughts

• The frame still provides acceptable insulation

​

Full replacement may offer better value where frames are badly discoloured, warped, insecure or difficult to operate.

​

An installer should explain both options before recommending complete replacement.

​

​

Comparing UPVC Window Quotes

 

Quotations should be based on the same specification.

​

Check that each quote identifies:

​

• Frame manufacturer and profile

• Window dimensions

• Fixed and opening sections

• Double or triple glazing

• Glass thickness and coatings

• Window energy rating or U-value

• Frame colour

• Handles and hardware

• Locking system

• Ventilation provision

• Safety-glass locations

• Removal and disposal

• Making good

• Installation guarantee

• Product guarantee

• Certification

​

A quotation stating only “supply and fit UPVC windows” does not provide enough detail for a meaningful comparison.

​

The lowest price may exclude work or use a different frame and glazing specification from the other quotations.

​

​

Planning Permission

 

Replacement windows of a similar appearance can often be installed in a house without planning permission.

​

Additional controls may apply where the property is:

​

• Listed

• Within a conservation area

• Subject to an Article 4 Direction

• A flat or maisonette

• Receiving windows of a different material or design

• Having a new bay window installed

​

Planning Portal guidance states that similar replacement windows will not usually require planning permission, although new bay windows can be treated as extensions. Listed buildings and designated areas may be subject to additional restrictions.

​

The planning position should be checked before ordering the windows.

​

​

Building Regulations and Certification

 

Replacement windows are covered by Building Regulations.

​

An installer registered with an authorised competent-person scheme can normally self-certify qualifying work. The installer should notify the local authority and provide a compliance certificate after completion.

​

Where a registered installer is not used, a separate Building Regulations application may be required.

​

Keep the certificate and guarantees safely because they may be requested when the property is sold.

​

​

Find Trusted UPVC Window Installers

 

UPVC window costs should be considered alongside energy performance, security, appearance and installation quality. Accurate measurement and careful fitting are essential for secure, weatherproof and reliable windows.

​

APN Double Glazing can connect homeowners with experienced local installers offering UPVC casement, sash, flush casement and bay windows.

​

Get in touch for expert advice and a free, no-obligation quote for your new UPVC windows.

​