Question answered
How long do uPVC fascias last?
The short answer
uPVC fascias commonly last somewhere between 10 and 40 years, and the published sources disagree. MyBuilder gives 10 to 20 years as the usual interval between replacements, while one boards retailer says 20 to 40. Sun, salt deposits, board thickness and the timber behind explain the gap. Treat any single figure as a range, never a promise.
Two published answers sit a long way apart, and both can be right for different houses. Here is why the numbers disagree and what actually decides how long the boards on your roofline stay sound.
Why the published figures disagree
MyBuilder's gutter, fascia and soffit guide, updated on 21 August 2026, says these parts are typically replaced every 10 to 20 years. A boards retailer, Plastic Centre, gives 20 to 40 years for uPVC fascia. Both are fair numbers, but they measure different things.
The first looks at when homeowners actually pay for replacement, which includes boards taken off because the gutter or the roof edge was being redone anyway. The second comes from a seller of the product and describes what a well-made board can do in good conditions. That is an interested source, so it deserves a little caution.
A sensible reading is that a decent board fitted well can outlive the lower figure, and whether it reaches the upper one depends on the factors below. None of these numbers promises a result, and a maker's warranty does not measure lifespan either. If your boards are already past the first range, that alone is no reason to replace them. Condition is the test, not the calendar.
What shortens or stretches the life of a board
uPVC does not rot, but it does age. Strong sunlight turns white boards yellow and chalky over time, and thin boards sag between fixings or bow when the sun heats one face. A heavier, better-made board resists distortion for longer, and joints that allow for expansion stay neater than tight ones.
A board can only be as sound as its support. A uPVC fascia is usually fixed to the rafter ends, and if those timbers have been wet for years from a leaking gutter, the plastic can look fine while its fixings loosen. For that reason a plastic fascia on a bad roof edge often needs more than a swap of boards. Our page on how long gutters last covers the part that usually fails first.
Poor installation matters as well. A gap at a corner or an open joint lets rain behind the board, and the damage shows years later, long after the fitter has gone.
Salt, grime and the sheltered underside
On the coast, the main extra is salt. HomeBuilding says marine air deposits salt on fascias and soffits, and that rain never reaches the parts under an overhang to rinse them clean. That was written about metal roofs, yet it applies to any board under the eaves. Grime, algae and green growth gather on the sheltered faces, and the boards look tired well before they fail.
Sponging them down with fresh water and a soft-bristled brush, twice a year, stops the surface from pitting. Avoid harsh abrasives, which scratch the glossy skin and give dirt a hold. More about colour and cleaning is in our note on grey and black fascias, since dark boards show deposits differently from white.
The underside, the soffit, is where the green growth first appears, because it gets the least rain and the least sun.
Signs a board is nearing the end
Look for cracks at the corners and joints, boards that have bowed or pulled away from the soffit, yellowing that will not wash off, and a gap where the gutter meets the fascia. Water marks on the brickwork below, or a drip behind the gutter after rain, suggest the roof edge has been taking in water.
Press gently with a screwdriver handle on the timber beyond any visible damage. Soft wood behind a plastic board means the problem is no longer cosmetic. If you are also considering new gutters, it is worth deciding on the gutter material at the same time, because fitting them together saves paying for access twice and gives matching colours.
Where only a short stretch is damaged, a repair or a capping board can be enough. We tell you which applies, and why, after looking along the entire roofline from scaffold height or a tower.
What replacement costs, and extras on a new run
MyBuilder's guide (updated 21 August 2026) gives typical UK ranges of £80 to £150 per metre for fascia and £100 to £180 per metre for soffit. Access, the condition of the timber behind and the length of the run move the total. Boards, soffits and gutter runs are all checked from the survey, and the price reaches you in writing alongside photos taken along your own eaves.
When new boards go up, that is the time to think about accessories. Some people ask whether a cover over the gutter is worth adding, and our answer on gutter guards sets out the pros and cons. The simpler job is often the right one: sound timber, well-fixed boards and a gutter that falls to the outlet. The full range of roofline work sits under gutters, soffits and fascias.
Choose a board of a stated thickness, ask how the corners are joined and check that scaffold and VAT are inside whatever price you are given.
Plastic boards in sea air
Can yellowed white fascias be brought back, or do they need replacing?
Light yellowing from grime often washes off with fresh water and a soft cloth. Deep yellowing from sunlight is in the plastic itself, and cleaning will not reverse it. If the boards are otherwise straight and tight, many people live with the colour or have them replaced at the next roofline job.
Is it worth replacing fascias without replacing the soffits too?
Sometimes, if the soffits are in good order, but the two meet at a joint and are normally removed together to get at the rafter ends. Doing both at once avoids paying for access twice and lets us check the timber and the ventilation gap that runs along the soffit.
Tell us about your roof
Describe what is happening and we will call you back to arrange a visit.
- Photographs of what we find
- A written quote with one total price
- Or call 01903 299063
10-year workmanship guarantee, in writing.