How Long Does Vinyl Siding Last? 20 to 40 Years, and the 5 Things That Decide Which End You Get

Short answer: vinyl siding lasts 20 to 40 years. Thin builder-grade panels, about 0.040 inches thick, are the ones that fade, crack, and warp at the 20 year end. Premium panels of 0.044 inches and up, installed with room to move, on a wall that does not bake in afternoon sun, reach 40. Whichever grade you have, the siding rarely fails all at once. It fails one wall at a time, and the south and west walls go first.

That matters because the question behind this one is usually whether to keep the siding or replace it. At Gorilla Works we do siding replacement in Portland, mostly in fiber cement, so we see a lot of vinyl at the end of its life. Here is what decides how long yours lasts, how to stretch it, and the signs that mean it is done.

Vinyl siding lifespan at a glance

How long does vinyl siding last?

20 to 40 years, with the industry's own trade group putting the floor at 20. Two things stretch that number more than anything else: how thick the panel is and how much sun it takes. A thin panel on a west wall in a hot climate is on the 20 year clock. A thick panel on a shaded wall in a mild climate can go past 40 and still look fine. Everything else, install, color, maintenance, moves the needle inside that range.

What shortens the life of vinyl siding?

• Sun and heat. UV light breaks down the plasticizers that keep vinyl flexible. Sun-baked walls turn chalky, fade, and get brittle enough to crack when a ladder leans on them.
• Thin panels. Builder-grade 0.040 inch vinyl waves, oil-cans, and warps in heat that a 0.046 inch panel shrugs off. The thickness is printed on the manufacturer's data sheet, and it is the single best predictor of how the siding will age.
• Nailed too tight. Vinyl has to slide on its nails as it expands and shrinks. Panels nailed hard to the wall buckle in summer and crack in winter. This is the most common install mistake, and it shows up within a few years.
• Dark colors and dark paint. Dark panels run hotter, which speeds up everything above. Painting old light vinyl a dark color is the fastest way to warp it.
• Impact. Hail, a mower throwing gravel, a basketball, a grill too close to the wall. Cold vinyl cracks on impact, and a crack lets water in.
• Water behind it. Vinyl is not a water barrier. It is a rain screen over a weather barrier. Missing or torn house wrap and bad flashing at windows rot the sheathing behind siding that still looks fine from the street.

How do you make vinyl siding last longer?

• Wash it once a year with a soft brush and a mild cleaner. Dirt and algae hold moisture against the panel and hide cracks you would otherwise catch early.
• Keep heat away from it. Grills, fire pits, and even sunlight bouncing off low-e windows next door can melt a panel.
• Trim shrubs and trees back so the wall can dry out and branches do not scrape the surface.
• Replace a cracked panel the season you find it. One cracked panel is cheap. The sheathing behind it after two wet winters is not.
• If you repaint, stay the same shade or lighter, in a vinyl-safe paint. Our guide on painting vinyl siding covers the rules.

How do you know when vinyl siding needs to be replaced?

Siding is done when the panels can no longer be repaired one at a time, or when the problem is behind them. Cracks and holes on several walls, panels that have warped or pulled loose, heavy fading that makes matching a replacement panel impossible, mildew that keeps coming back in the same spots, and any soft or damp spot on an interior wall are all signs the siding has stopped doing its job. So is age: vinyl from the 1980s and 1990s is brittle enough now that working on it breaks it, and most of it was the thin builder grade to begin with.

If the panels are sound and the only problem is the color, painting is the cheaper answer. We wrote up when that works and when it does not in Can you paint vinyl siding?.

How does vinyl compare to fiber cement?

Fiber cement is the siding most Portland homeowners replace vinyl with, so it is the fair comparison. It does not melt, warp, or get brittle in sun, it holds dark colors without a heat problem, and the leading maker backs the boards with a 30 year non-prorated warranty and expects them to last 50 years. The trade is weight, install labor, and the need to repaint or recoat every 10 to 15 years on site-painted product. Vinyl costs less up front and never needs paint. Fiber cement lasts longer and takes any color.

How long does vinyl siding last in Portland?

Usually toward the longer end for heat and the shorter end for water. Portland's mild summers spare vinyl the daily 100 degree afternoons that warp it in the South and Southwest, so sun damage here shows up as fade and chalk on south and west walls rather than buckling. The damp side is the problem. Nine wet months a year grow algae on north walls, keep the bottom courses wet, and find every gap in the flashing. On a Portland house the siding itself often looks passable at 25 years while the sheathing behind a leaky window has been rotting for ten of them. When we pull vinyl off a Portland house, the condition of the wall behind it is the surprise, not the condition of the vinyl.

Frequently Asked Questions

Does vinyl siding last 50 years?

Rarely. Premium panels on a shaded wall in a mild climate can pass 40, and a few reach 50, but the industry's own range is 20 to 40 and most houses see the middle of it. Fiber cement is the material that is expected to reach 50.

Does vinyl siding fade?

Yes, every color fades, and darker colors fade fastest. Most warranties only cover fading past a set threshold, so ordinary fade is on you. Fade by itself is cosmetic. Fade plus chalk that comes off on your hand means the surface is breaking down.

Can you replace one piece of vinyl siding?

Yes, with a zip tool to unlock the panel above. The hard part is matching the color on siding that has faded for 20 years. Keep a few spare panels from the original install if you have them.

What thickness of vinyl siding is best?

0.044 inch is the floor for a panel that will hold its shape. 0.046 and above is premium. Builder grade at 0.040 is the one to avoid, and it is the one most 1990s houses have.

Is 30 year old vinyl siding worth keeping?

Only if it is a thick grade with no cracks and a sound wall behind it. At 30 years most vinyl is brittle, faded past matching, and hiding at least one flashing leak. It is usually the point where replacing beats patching.

Which lasts longer, vinyl siding or vinyl windows?

About the same, 20 to 40 years, and for the same reasons: sun and heat. If both went in together on a 1990s house, they usually come due together, which is why we often replace them in the same project.

We covered the window side of that in How long do windows last?.

The bottom line

Vinyl siding lasts 20 to 40 years. Thick panels, light colors, a loose nailing job, shade, and a yearly wash push it toward 40. Thin panels, west sun, tight nails, dark colors, and water behind it pull it toward 20. Check the thickness, check the south and west walls, and check the wall behind the siding at the windows. Those three tell you where yours is.

When it is time, our siding installation team replaces vinyl with fiber cement over a full weather barrier and new flashing, so the next 50 years are covered.

Gorilla Works proudly serves Portland, Gresham, Beaverton, Hillsboro, Tigard, Lake Oswego, Happy Valley, Milwaukie, Troutdale, Vancouver WA, and Camas WA. Call (971) 343-4964 or request a siding assessment.