uPVC Windows (Black and White) Installation and Replacement Cost Calculator

How this calculator works

This calculator estimates a realistic price range rather than a single figure, because real-world quotes genuinely vary that much. It starts from typical UK supplied-and-fitted price ranges drawn from published 2026 industry cost guides, then multiplies them by the number of units you enter and by adjustment factors for each choice you make below. The result is a low-to-high band that a fair quote is likely to fall within, not a promise of the exact price you will pay.

Standard white uPVC windows typically cost around to per window supplied and fitted in the UK in 2026, with basic supply-only frames starting from roughly to . Black and anthracite grey uPVC has become hugely popular but usually carries a premium of around 30 percent over white, so a black uPVC window commonly lands between and fitted.

Number of uPVC windows

Enter how many uPVC windows you want installed or replaced. uPVC is the most popular window material in the UK, accounting for around three quarters of installations, and multi-window orders usually attract better per-window pricing.

Window size

Size is one of the biggest cost drivers for any glazed unit. A larger opening needs more frame material and a bigger, heavier sealed glass unit, and it usually takes longer to fit. The calculator uses three broad size bands based on common UK window dimensions: choosing the small band reduces the typical range by around 20 percent, while the large band increases it by around 40 percent. If your windows vary in size, run the calculator once per size band and add the results together.

Frame colour

White uPVC is the cheapest finish because it is the natural colour of the extruded profile. Black, anthracite grey, woodgrain and other coloured finishes are produced by bonding a foil to the profile or through-colouring the plastic, which adds a manufacturing step. Published guides put the premium for coloured uPVC at roughly 20 to 40 percent per window, and dual-colour frames, with a different colour inside and out, can cost more again.

Specification level

Two windows that look similar from the street can sit at very different price points. Budget products use simpler profiles, standard hardware and basic glass. Mid-range covers the typical A-rated units most UK installers quote by default. Premium covers high-end systems with upgraded security hardware, better thermal performance, special finishes or designer profiles, and typically adds around 30 percent to the price.

Where you live

Labour rates are not uniform across the UK. Published cost guides consistently show installation prices in London and the South East running roughly 20 to 30 percent above the national average, driven by higher labour costs, travel, parking and congestion charges. The calculator applies an uplift of around 20 percent if you select London and the South East. Product prices themselves are broadly similar nationwide, so the difference mostly reflects fitting costs.

What else affects the price

Beyond colour, uPVC window prices depend on the profile system, reinforcement, glazing specification and hardware. Cheap uPVC with thin walls and minimal steel reinforcement can look similar to quality multi-chambered systems on day one but performs noticeably worse over its lifespan. Style also matters: uPVC sash windows cost roughly 50 to 80 percent more than casements, and flush casement uPVC carries a premium over standard lipped casements. Expect quality uPVC windows to last 20 to 35 years.

Planning permission, building regulations and certification

Like-for-like window replacement on most houses does not need planning permission, but listed buildings always require consent and conservation areas often restrict materials and styles on visible elevations, so check with your local planning authority if either applies. Building regulations apply to every replacement window in a dwelling, setting minimum energy performance and safety glazing standards. Installers registered with a competent person scheme, such as FENSA or Certass, can self-certify compliance and issue a certificate after completion; otherwise you must arrange building control sign-off separately. Keep the certificate safe, as buyers’ solicitors routinely ask for it when you sell.