Should a commercial garage door be repaired or replaced?
Repair a commercial door when what failed is a wear part and the right part still exists: springs, cables, rollers, a damaged section or slat from the original maker. Replace it when the door no longer fits the job, when the parts that would make it right cannot be had, or when the repair would mean substituting parts the door’s rating depends on. The industry’s own sheets on spring life and component substitution draw most of that line, and this guide follows them.
By Commercial Garage Doorman, Grimsby, Ontario · Updated
Not sure which side of the line your door is on? A technician can tell you on one visit, and the quote says repair or replace in writing before anything starts.
Request a quoteWhat usually fails on a commercial door, and is it a repair?
Mostly wear parts, and mostly yes. Springs reach their cycle count, cables fray, rollers and bearings wear, and sections or slats get hit. None of those on its own is a reason to replace a door. Springs in particular fail for reasons DASMA lists plainly: rust that reduces the wire’s effective area, chlorine-bearing chemicals in wash bays, doors left open to temperature and moisture swings, weight added after the door was built, and lubrication skipped. A spring that breaks for one of those reasons is a repair, and if it keeps happening the repair is a high-cycle spring conversion, not a new door.
Source: DASMA Technical Data Sheet #190, Factors Affecting Spring Cycle Life (PDF). Checked 23 October 2026.When does a repair stop being a real repair?
When it needs a part that is not the right part. DASMA’s substitution sheets are blunt about it: parts that look the same may not be the same, differences in thickness or material too small to see can matter, and replacing parts on tested, certified or wind-rated doors with parts that are not identical may weaken the door and expose whoever substituted them to liability. On a rolling door, slats of the same shape and size may not interlock with another maker’s, and a bolt has to be of equal or greater grade. On a rolling fire door, NFPA 80 requires parts from the door’s own manufacturer.
Sources: DASMA Technical Data Sheet #183, Garage Door Component Substitution (PDF) and DASMA Technical Data Sheet #287, Rolling Door Component Substitution (PDF). Checked 23 October 2026.So when the original maker’s parts for a rated door can no longer be had, the honest answer may be that there is no compliant repair, and the door manufacturer is the one to confirm it.
Which signs point to repair, and which to replacement?
| What you are seeing | Points to | Why |
|---|---|---|
| One broken spring, cable or roller | Repair | Wear parts, made to be replaced |
| Springs breaking again and again | Repair: high-cycle conversion | The springs are sized for fewer cycles than the door does |
| One damaged section or a few slats | Repair, with the original maker’s parts | Look-alike slats and sections may not fit or hold |
| Rated door, maker’s parts unavailable | Likely replacement | A substitute part can void the rating |
| The opening now cycles far more than it did | Replacement may pay | Past about 55 cycles a day a high-speed door uses less energy |
| The building needs a wind or insulation rating the door does not have | Replacement | A rating is designed into the door, not added to it |
Does a replacement door need the opening changed?
Sometimes, and it is the part of a replacement most often missed. DASMA tells designers that if a rolling steel door with windlocks goes into an opening where another type of door was installed, or into a retrofitted opening, the jamb framing should be analysed, because windlocks transfer extra force into the jambs. Doors wider than 8 feet are likely to have them. Re-used wiring is the other trap: on a high performance door, the conductors that fed the old door may not carry the new one’s current.
Sources: DASMA Technical Data Sheet #292 and #461 (PDFs). Checked 23 October 2026.Both are covered in more depth on the new construction page, which applies to a replacement opening as much as to a new one.
What does each path cost?
Our published rates: emergency service is $349 plus HST for the first 90 minutes on site, travel included, then $147.50 an hour plus HST, with parts extra; a new commercial door starts from $5,000 and varies with the size of the opening and the door specified; the planned maintenance program is $60 per door a year plus HST. Commercial work carries a six-month warranty, plus the manufacturer’s warranty on a new door. Every figure is confirmed in writing before work starts; the details are on the prices page.