Gutters rarely fail all at once — they show warning signs for months or years before they actually stop protecting your home. Here's what to look for, and how to tell whether you're looking at a repair or a replacement.
A gutter run that dips in the middle or has visibly separated from the fascia in one or more spots usually means the hangers have failed or the fascia behind them has softened. A section or two can often be repaired; sagging along most of a run points toward replacement.
Small cracks let water escape before it reaches the downspout, and they tend to spread over time, especially through freeze-thaw cycles. A few isolated cracks can sometimes be patched; widespread cracking across an old system is a sign it's past its useful life.
If paint on your fascia or siding is peeling, bubbling, or streaked below where the gutter runs, water has been overflowing or leaking there for a while. This is worth acting on quickly, since prolonged exposure leads to wood rot and, eventually, foundation issues.
Aluminum gutters (the most common material) don't rust, but older galvanized steel gutters will corrode over time, especially where the protective coating has worn thin. Rust spots and pinhole leaks in steel gutters are a sign the system is nearing the end of its service life.
If you notice standing water near your foundation after a storm, or visible erosion channels in the soil below a downspout, gutters and downspouts aren't moving water where it needs to go — either from clogging, poor pitch, or a downspout that's undersized or too close to the house.
If you've confirmed the gutters are clear of debris but water still spills over the front during rain, the system itself is likely undersized for your roof, or the pitch is wrong. This is a sizing/installation problem, not something a cleaning will fix.
Basement moisture problems often trace back to gutters and downspouts failing to direct water away from the foundation. If a musty smell shows up seasonally after rain, it's worth having your gutter system checked as part of the diagnosis.
As a general guide: isolated problems (a sagging section, a leaking seam, one cracked spot) usually call for repair. Widespread issues, an aging steel or vinyl system, or a gutter that's undersized for your roof point toward replacement. A free on-site estimate is the fastest way to get a straight answer for your specific situation.