For 95% of the sliding glass doors we see, repair is the right answer - it costs 10–15% of replacement and gets you the same outcome (a door that slides smoothly, locks securely, and has clear glass). Replacement makes sense only when the frame is structurally bent, the threshold is rotted, or the door is so old that brand parts no longer exist.
Repair vs. replace — relative cost
A new sliding glass door installed in Northeast Florida typically runs $3,500–$8,500 for a standard aluminum slider, or $6,500–$15,000+ for a hurricane-impact rated door. Repairs are quoted as a flat written price based on what's actually wrong with your door and the size of the panel — usually around 10–15% of full replacement.
| Issue | Repair scope | Full replacement |
|---|---|---|
| Hard-to-open door (rollers) | ~7–12% of replacement | $3,500–$8,500+ |
| Won't lock (mortise) | ~4–7% of replacement | $3,500–$8,500+ |
| Off-track / track damage | ~5–15% of replacement | $3,500–$8,500+ |
| Foggy glass (failed seal) | ~12–20% of replacement | $3,500–$8,500+ |
| Shattered glass | ~12–25% of replacement | $3,500–$8,500+ |
Repair pricing is a flat written quote issued on site based on diagnosis and door size. Replacement ranges reflect installed cost for a standard 6-ft slider; hurricane-impact and oversized doors run higher.
Repair when…
- • Frame and threshold are straight and solid
- • Door is less than 25 years old
- • Replacement parts (rollers, lock, IGU) are still available
- • Glass is intact OR the IGU can be replaced
- • You like the look and size of your existing door
Replace when…
- • Frame is visibly bent, twisted, or out of square
- • Threshold is rotted or has structural water damage
- • Door is 30+ years old and parts are unobtainable
- • You want to upgrade to hurricane-impact (whole new door)
- • You're remodeling and changing the opening size anyway
10-year lifecycle comparison
The honest math isn't just the upfront cost — it's the cost of ownership over the door's expected remaining life. Here's the typical 10-year picture, using a mid-range new installed door for the replace path.
| Year | Repair path | Replace path |
|---|---|---|
| Year 0 | Full repair: rollers + track cap + lock (~15% of replacement) | $3,500–$8,500+ installed (new slider) |
| Year 3 | — | — |
| Year 5 | Preventative roller refresh (~5% of replacement) | Mortise lock service (~3% of replacement) |
| Year 8 | Optional IGU swap if seal fails (~10% of replacement) | — |
| 10-year total | ~30% of replacement | ~103% of replacement |
The repair path saves roughly two-thirds of total cost over 10 years on a door that performs identically. The structural frame is unchanged in both scenarios because it was already built for a 25+ year service life.
What the structural frame actually does
The aluminum or vinyl frame of a sliding glass door has two jobs: hold the door square inside the wall opening and channel water out through weep holes during rain. Neither of those jobs wears out from use. Frames fail only from structural events - foundation settling that twists the opening, water damage that rots the sub-floor and threshold, or impact damage to the corners. Absent one of those, the frame will outlast the rollers, locks, and glass it holds by a factor of three or four.
That's why repair almost always wins the math. The expensive parts of a sliding glass door system (the structural frame, the wall flashing, the threshold) are the parts that didn't fail. Replacing the whole door means paying to re-install components that still had 15-20 years of life left in them.
Why contractors push replacement
Replacement contractors make their margin on the door itself - usually a 30-50% markup over wholesale. Repairs don't pay anywhere near as well, so most full-service window-and-door companies steer toward replacement even when repair would solve the problem. As repair-only specialists, we don't have that incentive. We make money when your existing door slides smoothly again - which means our advice and our quote tell you the same thing.
Environmental cost: a new door isn't free
A typical 6-foot sliding glass door contains roughly 90-130 pounds of aluminum, 80-110 pounds of tempered glass, and 8-15 pounds of vinyl and rubber gaskets. Replacing a door that could be repaired sends all of that to a landfill. Roller replacement, by contrast, generates about 3 ounces of waste (the old rollers themselves, which are usually recycled). For homeowners who care about embodied carbon, repair is the order-of-magnitude better answer.