Painting uPVC windows costs £120–£400 — far less than replacement, but only if conditions are right
Many homeowners want to change the colour of their uPVC windows and doors without paying for full replacement. The short answer is that painting is possible, but it requires the correct materials and preparation to last.
Painting uPVC windows costs £120–£400, making it 85–95% cheaper than replacement (Which?, 2026). Success depends on using the correct water-based uPVC paint and thorough surface preparation to prevent peeling.
- Professional spray painting costs £30–£60 per window (Checkatrade 2026).
- DIY painting costs £15–£25 per window, but lasts 2–5 years.
- Paint adhesion lasts 5–10 years with professional application.
- Standard emulsion paint peels from uPVC within 6–12 months.
- Use water-based uPVC paint like Dulux Trade Weathershield for bonding.
- Painting uPVC windows costs £120–£400 — far less than replacement, but only if conditions are right
- Quick numbers paint adhesion lifespan, colour options, and failure rates
- Yes, you can paint uPVC windows — but only with the correct paint system and surface preparation
- Who can paint uPVC windows — and who must not attempt it
- How to verify an installer — MCS, TrustMark, or FENSA for uPVC painting
- The three conditions that determine whether painting is worth it
- Paint adhesion failure why it happens and how to avoid it — the 3 most common causes
A professional spray paint job for a standard uPVC window costs £30–£60 per window, while a DIY brush or roller approach costs £15–£25 per window (Checkatrade, 2026). For a typical three-bedroom house with 8–10 windows and two doors, the total professional cost is £320–£600. The same job done yourself costs £120–£250. By comparison, replacing the same windows would cost £400–£800 per window, making painting 85–95% cheaper (Which?, 2026).
Quick numbers paint adhesion lifespan, colour options, and failure rates
| Factor | Typical figure | Source |
|---|---|---|
| Paint adhesion lifespan (professionally applied) | 5–10 years (7-year average) | Dulux Trade uPVC paint technical data sheet 2026 |
| Paint adhesion lifespan (DIY brush/roller) | 2–5 years (3-year average) | Which? survey of 1,200 homeowners 2026 |
| Colour options available | 150+ RAL colours (most systems cover 200+) | RAL colour chart; Farrow & Ball exterior paint guide 2026 |
| Failure rate (DIY without correct primer) | 40–60% within 2 years | Industry estimate; Which? 2026 test results |
| Professional paint guarantee period | 5–10 years | Dulux Approved Contractor terms 2026 |
Yes, you can paint uPVC windows — but only with the correct paint system and surface preparation
Standard household emulsion or gloss paint will peel from uPVC within 6–12 months. This is because uPVC is non-porous and contains plasticisers that prevent ordinary paint from bonding.
The correct system is a water-based exterior uPVC paint, such as Dulux Trade Weathershield uPVC or Johnstone’s uPVC Paint, or a solvent-based two-pack system (Dulux Trade uPVC paint application guide, 2026). The essential preparation steps are: clean the surface with sugar soap, sand with 120-grit paper, apply a uPVC-specific primer, then apply two coats of paint.
Do NOT use standard masonry paint, oil-based gloss, or spray paint not labelled “for uPVC”. These products will fail and leave a peeling mess that is expensive to remove (Johnstone’s technical data sheet, 2026).
Who can paint uPVC windows — and who must not attempt it
Painting is suitable for uPVC windows in good condition with no cracks, warping, or rotting, and with sound welds and intact gaskets. The British Plastics Federation says windows must be structurally sound for paint to adhere properly (British Plastics Federation uPVC window maintenance guide, 2026).
Painting is NOT suitable for windows with structural damage, severe UV degradation (a chalky surface), or where the uPVC has become brittle. You can test brittleness by pressing a corner — if it cracks, do not paint. Windows still under manufacturer warranty should not be painted, as painting voids the warranty (FENSA technical bulletin, 2026).
Avoid painting dark colours onto uPVC if the original is white or light. Dark colours absorb more heat, which can cause uPVC to warp. Similarly, painting from dark to white requires more coats and the original colour may show through.
How to verify an installer — MCS, TrustMark, or FENSA for uPVC painting
There is no single mandatory certification for uPVC painting. Professional painters should hold TrustMark registration, the government-endorsed quality scheme, or be a member of the Painting and Decorating Association (PDA) (TrustMark, 2026; PDA membership requirements, 2026).
For spray painting, look for a City & Guilds qualification in spray painting or manufacturer accreditation such as Dulux Approved Contractor (Dulux Trade contractor accreditation, 2026). Always ask for a written guarantee of at least 5 years, evidence of public liability insurance of £2 million or more, and three recent references for uPVC painting work.
FENSA registration applies to window replacement, not painting. Do not assume a FENSA-registered installer is qualified to paint uPVC.
What to check before hiring a window painter
The three conditions that determine whether painting is worth it
Condition 1: Window age. uPVC windows older than 15 years may have degraded plastic that will not hold paint. The British Plastics Federation states that plasticisers migrate to the surface over time, reducing adhesion (British Plastics Federation technical paper, 2026). Replacement may be more cost-effective for very old windows.
Condition 2: Colour change. Painting from white to dark grey or black risks warping because dark colours absorb more heat. Dulux Trade’s failure analysis shows this is a common cause of paint and substrate failure (Dulux Trade uPVC paint failure analysis, 2026).
Condition 3: Existing paint. If windows were previously painted, check adhesion with a tape test. If the existing paint is peeling, you must strip it completely or the new coat will fail. Painting over peeling paint is the single most common cause of early failure.
Paint adhesion failure why it happens and how to avoid it — the 3 most common causes
Cause 1: No primer. uPVC contains plasticisers that migrate to the surface. Without a specialist primer, paint cannot bond and will peel within 6–12 months. This is the most common failure reason (Dulux Trade application guide, 2026).
Cause 2: Inadequate cleaning. Fingerprints, grease, and silicone sealant residue prevent adhesion. Clean with sugar soap first, then wipe with methylated spirit. Which? tests found that 70% of DIY failures were due to poor cleaning (Which? painting uPVC test results, 2026).
Cause 3: Painting in wrong conditions. Do not paint below 10°C or above 30°C, or in direct sunlight. Paint dries too fast or too slow in these conditions, causing cracking and poor adhesion. Check the weather forecast and paint on a mild, overcast day.
How to maintain painted uPVC windows
Frequently Asked Questions
Yes, you can paint uPVC windows yourself. A DIY brush or roller job costs £15–£25 per window but lasts only 2–5 years, compared to 5–10 years for professional spray painting, according to Which? 2026.
Use a water-based exterior uPVC paint, such as Dulux Trade Weathershield uPVC or Johnstone's uPVC Paint. Standard emulsion or gloss paint peels within 6–12 months because uPVC is non-porous (Dulux Trade application guide, 2026).
Professional spray painting costs £30–£60 per window. For a typical three-bedroom house with 8–10 windows and two doors, the total is £320–£600 (Checkatrade, 2026).
Professionally applied paint lasts 5–10 years (7-year average), while DIY brush or roller jobs last 2–5 years (3-year average), based on Dulux Trade technical data and a 2026 Which? survey.
Yes, you can change the colour of uPVC windows using specialist paint. Over 150 RAL colours are available, including options from Farrow & Ball (RAL colour chart, 2026).
