How long does a garage roof last?

Torch-on felt is a layered bitumen sheet melted onto the deck. Less, a flat-roofing guide revised in March 2026, puts its life at 10 to 20 years, adding that a well-laid roof can reach 20 while a badly laid one might fail inside 10. CORC, the roofing contractors' confederation, gives 30 years or more, so published sources do disagree with one another.

The spread is wide because felt depends so heavily on workmanship. The laps, the edges, the slope to the gutter and the boards underneath all count. A felt roof that is blistering, splitting along its seams or holding puddles is telling you it is near the end. Early failure usually shows first at the laps and along the edges, so look there before you look anywhere else. Our felt roof blisters answer shows what to look for when you climb a ladder, or better still, when you photograph the roof from a window or a safe viewpoint, since a wet felt surface is slippery underfoot.

EPDM is rubber roofing supplied as a single membrane. GreenSpec expects a service life of 20 to 30 years, while Less quotes 30 to 50 years. A cautious figure for planning is 20 to 30 years or more. GRP is glass-fibre laid in resin and finished with a topcoat, and Less gives it 25 to 40 years.

Both depend on a clean, sound deck and well-finished edges. A sheet damaged at a corner or an upstand will fail long before the number of years in any guide, so the figures describe the covering at its best rather than the typical garage in practice. Maintenance matters too, because a blocked outlet or a branch scraping the surface can undo years of good work.

Our pages on the EPDM garage roof and the EPDM lifespan go further on the rubber option.

A garage with a pitched roof can carry the same coverings as a house. Marley expects its concrete tiles to last around 60 years, while stressing that this is an expectation and not a promise. For clay, Marley points to a 60-year minimum life expectancy attributed to the Building Research Establishment. Old hand-made peg-tile roofs are another matter, and a building conservation source calls that 60-year number a poor guide for them.

The tiles are only part of the roof. Timber battens, the sheet underneath and the nails or clips holding it all down must also stay sound, and on a long-neglected garage those are often what give up first. A slipped tile is a sign to look closer, because the fault may lie below it. Our pitched garage roof page covers what to expect from that kind of roof, including how the structure under the tiles affects the choice of covering.

Standing water is the biggest enemy of a flat garage roof. A roof without enough fall, or with a blocked outlet, holds water, and the covering ages faster. Overhanging branches drop leaves and keep the surface damp. Strong sun and gales are hard on edges and trims that were not fixed properly.

Near the sea, wind-driven rain and sea weather test the weak points, which are the edges, the laps and the joints around anything that pokes through the roof. Condensation can also rot the boards from beneath, which is a common reason a covering fails early on a garage that is damp inside. Our answer on garage roof condensation explains how to spot it and what helps.

None of this is cause for alarm. It is the reason to check a garage roof once or twice a year.

A lifespan is how long a covering typically lasts when it is laid well and looked after. A written promise from a firm covers that firm's own work for a set number of years. Neither one guarantees the other, so ask exactly what any paperwork covers and what it leaves out.

Paying for a short-lived covering again and again can total more than a single longer-lived job, but the right answer also depends on how many years you will keep the garage. A lifespan tells you what the material can do, and a promise tells you who puts things right, so you need both pieces of information when you compare quotes. Our survey records the roof in pictures and ends with a clear recommendation: mend it, or renew it. Our garage roof repair or replace answer explains the thinking, and the garage roof replacement hub gathers the rest.