uPVC cleaning and restoration covers window frames, doors and roofline soffits and fascias, all of which are made from the same material and discolour for broadly the same reasons over time, even though they're often treated as separate jobs. Understanding why uPVC goes grey or yellow in the first place explains why a proper restoration treatment can genuinely bring it back, rather than needing full replacement.
This guide covers why uPVC discolours, how cleaning differs from full restoration treatment, and realistic UK pricing for both, across window frames, doors and roofline.
Why does uPVC discolour over time?
White uPVC discolours through a combination of UV exposure, which gradually breaks down the surface finish and causes a yellowish tinge, and general atmospheric grime and algae growth, which gives a greyer, streakier appearance. South and west-facing frames, getting the most direct sun exposure, tend to yellow faster, while shaded, damp elevations tend towards the greyer, algae-driven discolouration instead.
Both types of discolouration are commonly mistaken for permanent ageing that can only be fixed by replacement, but in the majority of cases a proper clean followed by a restoration treatment brings back a significantly improved, often close to original, appearance.
Cleaning versus restoration treatment
A standard clean removes surface grime and algae using a gentle detergent or soft wash solution, which noticeably improves appearance but doesn't address deeper oxidisation or UV-related yellowing that's affected the material itself rather than just sitting on the surface. This level of clean is usually sufficient for uPVC that's simply grimy rather than genuinely discoloured.
Restoration treatment goes a step further, using a specific product designed to revive oxidised uPVC surfaces, sometimes combined with light abrasive polishing, to genuinely lift yellowing and restore a whiter, more uniform finish. This is worth considering on frames or roofline that remain visibly yellowed or patchy after a standard clean.
What uPVC cleaning and restoration typically costs
Standard uPVC window frame cleaning is often included as part of a regular window cleaning round at no extra charge, or priced modestly as an add-on if requested separately. Full restoration treatment for genuinely discoloured or oxidised uPVC, covering window frames, doors or roofline, typically runs from around £15 to £30 per window or door, or is priced by roofline length for soffits and fascias, reflecting the extra product and application time involved.
It's worth getting a professional opinion before committing to full replacement of window frames or roofline purely for cosmetic discolouration, since restoration is considerably cheaper and, for most cases short of genuine structural or mechanical failure, achieves a comparable visual result.
When replacement is the better option
Restoration works well for cosmetic discolouration but won't fix mechanical problems like failing seals, cracked frames, or hinges and locks that no longer function properly, all of which need replacement or repair rather than a surface treatment. If a cleaning or restoration visit reveals these issues alongside the discolouration, it's worth addressing them separately rather than expecting a cosmetic treatment to solve a functional problem.
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