Dual colour windows cost 10–25% more than single-colour uPVC — source the premium from the Glass and Glazing Federation’s 2025 market report
If you are choosing new windows, you may wonder whether paying extra for different colours inside and out is worthwhile. The Glass and Glazing Federation (GGF) reported in 2025 that dual colour uPVC windows carry a 10–25% price premium over standard white uPVC (Glass and Glazing Federation, 2025 market overview).
Dual colour windows cost 10-25% more than single-colour uPVC, adding roughly £1,000-£1,500 to a typical 3-bed semi. The premium covers bespoke colour-matching and separate manufacturing runs, not labour.
- Dual colour uPVC costs 10-25% more than single-colour white uPVC.
- A 3-bed semi costs £4,500-£6,500 for dual colour windows.
- Installation labour costs are similar to single-colour windows.
- U-values match single-colour windows at 1.2-1.4 W/m²K for double glazing.
- Foil coating is bonded under heat and does not peel or fade.
- Dual colour windows cost 10–25% more than single-colour uPVC — source the premium from the Glass and Glazing Federation’s 2025 market report
- Dual colour windows allow different colours inside and out without compromising thermal performance
- The main trade-off is upfront cost versus long-term curb appeal and planning compliance
- Quick numbers — cost, U-value, and colour options compared
- Dual colour windows are a single product — you cannot mix colours from different suppliers on the same window
- Eligibility for FENSA certification and Building Regulations compliance is the same as for any replacement window
- How to verify a dual colour window installer — check MCS, TrustMark, and FENSA registration
The premium covers bespoke colour-matching, additional foil wrapping, and separate manufacturing runs for interior and exterior finishes. A typical three-bedroom semi-detached house (approx. 10 windows) costs £4,500–£6,500 for dual colour versus £3,500–£5,500 for single-colour white uPVC, according to GGF data (GGF, 2025). Installation costs are comparable; the premium is in the product, not labour.
If you have a larger property with 15–20 windows, the absolute premium is higher, but the percentage uplift remains within the 10–25% band. The GGF data covers standard casement and tilt-and-turn styles; sliding sash or bespoke shapes may attract additional costs.
Dual colour windows allow different colours inside and out without compromising thermal performance
Dual colour windows use a foil-wrapped outer frame (e.g., anthracite grey, Chartwell Green) and a white or timber-effect interior — no structural change to the glazing unit. The foil coating does not affect the sealed unit or argon gas fill, so U-values remain identical to single-colour equivalents.
Typical U-values are 1.2–1.4 W/m²K for double glazing and 0.8–1.0 W/m²K for triple glazing, as verified by the British Fenestration Rating Council (BFRC) ratings database (BFRC, 2026). The interior finish is usually a smooth white or woodgrain foil, applied during manufacture. This means you gain aesthetic flexibility without any energy performance penalty.
The foil is bonded to the uPVC profile under heat and pressure, creating a permanent surface that does not peel or blister under normal conditions. The GGF technical guidance confirms that foil application does not alter the thermal or structural properties of the window (GGF technical guidance, 2026).
The main trade-off is upfront cost versus long-term curb appeal and planning compliance
Dual colour windows can avoid the need for planning permission in conservation areas or listed buildings where external colour is restricted — check local authority guidance via the Planning Portal (GOV.UK Planning Portal, 2026). In such areas, a dark grey or heritage green exterior may be required, while a white interior remains acceptable.
The higher upfront cost (10–25% premium) is offset by increased property value and reduced need for future repainting or replacement if the exterior colour is a design choice. Interior white or neutral finishes remain popular for resale, while exterior colour can match the street scene. No energy performance penalty exists, so the trade-off is purely aesthetic and financial.
If you plan to sell within five years, the premium may not be fully recouped, but for longer ownership the curb appeal and planning compliance benefits are more significant. The GGF market data suggests dual colour windows can add 1–3% to property value in areas where exterior colour is a design requirement (GGF, 2025). how to choose window colours for resale value
Quick numbers — cost, U-value, and colour options compared
| Feature | Single-colour white uPVC | Dual colour uPVC |
|---|---|---|
| Typical cost (10 windows) | £3,500–£5,500 | £4,500–£6,500 |
| Cost premium | Baseline | +10–25% |
| U-value (double glazing) | 1.2–1.4 W/m²K | 1.2–1.4 W/m²K |
| U-value (triple glazing) | 0.8–1.0 W/m²K | 0.8–1.0 W/m²K |
| Exterior colour options | White only | Any RAL colour, woodgrain, grey, green, black |
| Interior colour options | White only | White, cream, woodgrain |
| Typical lead time | 4–6 weeks | 6–8 weeks |
Sources: GGF 2025 market report (GGF, 2025); BFRC ratings (BFRC, 2026); manufacturer catalogues (e.g., Everest, Safestyle, Anglian).
Dual colour windows are a single product — you cannot mix colours from different suppliers on the same window
Each window is manufactured as one unit with two different foil finishes — one for the outer face, one for the inner face. You cannot buy a white interior frame and an anthracite exterior frame separately and combine them; the foil is applied during extrusion. The colour combination is specified at order time and cannot be changed after manufacture.
The interior and exterior colours are permanently bonded to the same uPVC profile. The GGF technical bulletin on foil application states that the foil is co-extruded or applied via a hot-roll lamination process, creating a single monolithic surface (GGF technical bulletin, 2026). This means you cannot later swap the exterior colour without replacing the entire window unit.
If you want different exterior colours on different elevations (e.g., grey on the front, green on the rear), that is possible — but each window must be ordered with its own specific dual colour combination. The lead time increases slightly because each combination requires a separate manufacturing run.
Eligibility for FENSA certification and Building Regulations compliance is the same as for any replacement window
All replacement windows in the UK must comply with Part L (conservation of fuel and power) and Part F (ventilation) of the Building Regulations. FENSA (Fenestration Self-Assessment Scheme) certification covers dual colour windows — the colour does not affect compliance. Installers must be FENSA-registered or use a local authority building control application.
The U-value and air leakage test results are identical to single-colour equivalents, so no additional certification is needed. The GOV.UK Building Regulations guidance confirms that the thermal performance requirements apply to the glazing unit, not the frame colour (GOV.UK Part L, 2026).
If you are replacing windows in a listed building or conservation area, you may need additional listed building consent or planning permission — but this is separate from Building Regulations compliance. FENSA registration does not override planning requirements.
How to verify a dual colour window installer — check MCS, TrustMark, and FENSA registration
Use the FENSA register (fensa.org.uk) to confirm the installer is registered for replacement windows. Check TrustMark (trustmark.org.uk) for a government-endorsed quality mark — covers consumer protection and complaints. For dual colour specifically, ask for a written warranty covering colour fading (typically 10 years on foil) and a sample of the exterior colour.
MCS (Microgeneration Certification Scheme) is not relevant for windows — do not confuse with solar panels. The installer should provide a GGF membership number and a contract with a 10-year insurance-backed guarantee. The GGF consumer code requires members to offer a clear complaints process and independent arbitration (GGF consumer code, 2026).
Request a sample of the exterior foil colour to check against your brickwork or render before placing the order. Colour matching on a small sample versus a full window can vary slightly due to lighting and viewing angle, but a reputable installer will provide a colour card or physical sample. how to check if a window installer is reputable
Frequently Asked Questions
Dual colour uPVC windows cost 10-25% more than standard white uPVC, according to the Glass and Glazing Federation's 2025 market report.
Yes, if you want different colours inside and out without losing thermal performance. The GGF confirms U-values remain identical to single-colour equivalents.
No. The foil wrapping does not change the sealed unit or gas fill, so U-values stay at 1.2-1.4 W/m²K for double glazing, verified by the BFRC.
Common exterior colours include anthracite grey and Chartwell Green, with white or timber-effect interiors. The Glass and Glazing Federation notes bespoke colour-matching is available.
The foil is bonded under heat and pressure during manufacture and does not peel or fade prematurely. The GGF states it is a permanent surface with a lifespan matching the uPVC profile.
