The short answer
There is no single life for guttering, because it depends on the material and how it is looked after. Plastic tends to fade and turn brittle, cast iron can outlast the house if it is painted and kept clear, and aluminium does not rust. The boards behind the gutter have a published typical replacement interval of 10 to 20 years.
Typical lives by material
National price guides say more about the boards behind the gutter than about the gutter itself. MyBuilder's guide, updated in August 2026, advises a check every five years and a swap somewhere between 10 and 20 years in, with the exact point set by the material and how exposed the house is. A retailer, Plastic Centre, puts uPVC boards at between 20 and 40 years. The two disagree, and a retailer has a stake in the answer, so treat the span as a wide band rather than a promise.
The table below describes how each gutter material tends to age, which tells you more than a number would.
| Material | How it tends to age |
|---|---|
| uPVC | Fades, turns brittle in cold weather, and joints or clips fail before the channel wears through |
| Cast iron | Heavy and long-lived if painted and kept clear, but rusts from the inside and cracks at joints |
| Aluminium | Does not rust and keeps its colour, but dents easily and the sealed joints need renewing |
| Galvanised steel | Lasts until the zinc coat is breached, then rusts quickly at cut edges and joints |
What shortens the life of a gutter
Blockage is the usual culprit. A gutter that stays full holds water against the metal or plastic, adds weight to the brackets, and freezes in winter. The expansion of ice can split a joint or push a bracket off its screws.
Poor fixing comes next. Brackets set too far apart let the run droop, and a drooping run keeps water standing, so the damage feeds itself. Tree overhang, bird nesting and moss washed from the roof covering all add to the load. Painted cast iron fails where the paint has gone and water sits, which is why the inside of the channel matters as much as the outside.
Sunlight is a quiet enemy of plastic. Years of ultraviolet turn the surface chalky and the material loses its flex, so a knock from a ladder that would once have bounced off now cracks it. South-facing runs often show this first.
On a house with a high roofline, access matters too. A gutter you cannot easily reach gets cleaned less often, and so wears out sooner.
Signs a run is near the end
- Staining or green streaks down the wall below a joint, which means water is escaping.
- Gutter sections that bow between brackets, even when the channel is clear.
- Brittle plastic that cracks when pressed, or a white powdery surface on faded uPVC.
- Rust flakes in the bottom of a cast iron or steel channel, or daylight through a rusted patch.
- Repeated patching of the same joints, each repair lasting less time than the last.
- Brackets that spin on their screws because the fascia timber has softened.
One failed joint is a repair. A whole elevation of cracked or bowed sections is the point to price a replacement, since patching old plastic often just moves the leak along the run.
Which side of the house wears out first
Gutters rarely age evenly. A south or west elevation takes the most sun, so plastic there fades and goes brittle first. A north elevation stays damp and shaded, which suits moss and green growth, and a shaded cast iron run can rust from the inside while the outside looks fine.
Runs under trees age fastest of all. They fill with leaves, hold water and take the knocks from falling twigs. A long run on a gable wall, with a single downpipe, works harder than a short one on a porch. When you plan a replacement, look at the whole house and expect the worst elevation to fail a few years before the best.
Replace the gutter, the boards or both?
Gutters hang on the fascia, so the two lives are linked. If the boards are sound, a new gutter on the old fascia can be a sensible, smaller job. If the fascia is soft or split, new brackets will not hold, and replacing only the gutter wastes the money.
That is why a roofline is so often done in one go: one scaffold serves every part of the job, and nobody pays twice for access. For gutters alone, MyBuilder's national figure for replacement is £30 to £70 per metre, and the final number depends on access and the length of run.
Dark finishes ask a little more care in the choice of material, as our page on a black roofline explains, and damp boards may need the checks in our piece on mouldy soffits.
Making a gutter last longer
Clearing the run in spring and again after the autumn leaf fall does more for its life than any other single step. Check the downpipes too, since a blocked one backs water into the channel. Our guide to downpipes covers what to look for at the bottom of each run.
Repaint cast iron before the paint fails and keep the inside coated. Tighten loose brackets as soon as you notice them, and cut back branches that scrape the roof edge.
If you are unsure whether a run has years left, we can tell you on a visit. We test the brackets, press the plastic, look inside the channel and check the board behind, then send photographs of your own gutters with a written quote. We say plainly whether a repair would hold or a replacement is sounder.
Our 10-year workmanship guarantee is given in writing, and we clear the site when we are done. See also our gutters, soffits and fascias page.