A small flat roof leak repair, like a seam or puncture patch on a rubber (EPDM) roof, often costs $150 to $500. Larger repairs to seams, flashing or drains typically run $450 to $1,200 in Central Arkansas. Wet insulation under the membrane, ponding that needs to be fixed, or an old roof that needs recovering raise the price.
Flat roof repair prices
| Repair | Typical range |
|---|---|
| Small seam or puncture patch (EPDM) | $150 to $500 |
| Larger seam, flashing or patch repair | $450 to $1,200 |
| Drain or scupper repair | Quoted on site |
| Wet insulation replacement | Quoted on site |
| Recover or replacement | Quoted on site, by roof size |
Small patch range from national cost guides (HomeGuide, Fixr, 2026). Moderate repair range from Central Arkansas cost guides. Not quotes.
What drives flat roof repair cost
The roof material
Rubber (EPDM), TPO, modified bitumen and built-up tar and gravel each need their own repair materials. Heat-welded TPO repairs need different tools than rubber patches.
How long it has leaked
Water spreads under a flat roof membrane. A leak that ran for months can soak the insulation board underneath, and wet insulation has to be cut out and replaced.
Ponding
If water sits in a low spot, patching the leak is only half the fix. Adding a small cricket or tapered insulation to move water to the drain costs more but keeps the leak from coming back. See water ponding on a flat roof.
Access
Porch and garage roofs are easy. Flat roofs on two-story additions or commercial buildings take more setup.
DIY kits versus a repair
Store-bought patch kits cost $30 to $150 and can hold a small puncture if the surface is cleaned and primed correctly. They rarely fix seam failures or leaks at flashing. If you patch it yourself and it keeps leaking, the water is getting in somewhere else. Learn more on flat roof leak repair.
How much does it cost to fix a flat garage roof?
Small patches on a flat garage roof often fall in the $150 to $500 range. If the roof is old rolled roofing or has soaked decking, replacing the covering on a small garage can make more sense than patching, and it is quoted by size.
How much does commercial flat roof repair cost?
Commercial repairs depend on roof size, material, drains and access, and are priced after a look. Multiple leaks on a large roof are best handled with an itemized list so you can plan. See commercial roof leak repair.
Is rubber roof repair expensive?
Rubber (EPDM) repairs are among the most affordable flat roof repairs when the leak is a seam or puncture. They get expensive when water has been under the rubber for a long time and the insulation below is soaked.
How long does a flat roof repair take?
A small patch or seam repair usually takes a few hours once the roof is dry. Replacing wet insulation or fixing a ponding area takes longer.
Is it worth patching an old flat roof?
If the membrane is mostly sound and dry underneath, yes. If it is cracked everywhere or the insulation is soaked, a recover or replacement is often cheaper over time.
Can a coating fix my flat roof leak?
A coating can protect a repaired roof but will not fix an open seam or wet insulation on its own.
Why does my flat roof leak in a different spot each year?
Old membranes fail in many places as they age, and water travels under them. That pattern often means replacement is near.
How long does a flat roof patch last?
A proper patch with matching material can last as long as the roof around it.