A steel door takes a beating in the GTA. Road salt splashes the bottom rail all winter, the sun cooks the south-facing side all summer, and the freeze-thaw cycle works on the frame every single year. Sooner or later something gives, and the question is always the same: patch it, or pull it out and start over?
The honest answer is that it depends on where the damage is, not how bad it looks. A door that looks terrible can often be saved. A door that looks fine can be structurally finished. Here’s how we make the call on site.
The 30% rule (start here)
The rule of thumb across the industry: if the repair costs more than about 30% of a full replacement and the door is over 15 years old, replace it. Below that threshold, repair almost always wins.
For context, in the GTA a steel entry door typically runs $2,200–$6,000 installed, with most homeowners landing around $3,500–$5,500 for a quality unit with sidelights including removal of the old door. Budget single-slab installs start closer to $2,000. Against that, new weatherstripping on a straight slab is a $50–$150 job. That gap is why so many “I need a new door” calls end as a one-hour repair.
These are market ranges, not our quote — the only accurate number comes from someone looking at the opening. Get a free estimate and we’ll tell you which side of the line you’re on.
Repair it — when the damage is cosmetic or hardware-only
Steel is forgiving. If the skin hasn’t been breached and the core is intact, a good tech can make the door look new.
Surface dents and scratches
A dent that hasn’t punched through the outer skin is filled with body filler, sanded and refinished. Done properly, you won’t find it afterward. This is bread-and-butter steel door repair.
Hardware problems
A single failed hinge, a dragging latch, a lock that needs 3 tries — these are hardware issues wearing the mask of a door problem. Sagging hinges are the most common cause of a door that suddenly won’t close, and it’s a cheap fix. Related: help for sticking or jammed doors and pivot hinge replacement.
Worn weatherstripping and drafts
If you can see daylight around a slab that’s still square, that’s a seal issue, not a door issue. See our guide to weatherstripping replacement.
Cracked glass insert
The lite gets replaced, the door stays. Same for aluminum and glass doors.
Replace it — when the core or frame is gone
These are the ones where repair is throwing money at a door that’s already lost.
Rust you can see from outside
This is the big one, and it’s counterintuitive. Rust on a steel door starts on the inside. By the time it’s visible on the exterior skin, the core has already been compromised. Sanding and painting it hides the symptom for a season and the door keeps rotting from within. Visible rust-through means replacement.
Delamination and loss of rigidity
Push on the middle of the slab. If it flexes more than roughly 1/4 to 3/8 of an inch, the skin has separated from the core — usually water damage. A flimsy door has lost the structural integrity it was bought for. Replace it.
A frame that isn’t plumb, level and square
This is the one people miss. If the frame is racked or the bottom has rotted out, hanging a brand-new slab in it just transfers the stress to the new hinges and you’ll be back in a year. The frame gets addressed too — see door frame repair, exterior frame repair, and our guide to frame rot repair.
Age plus multiple faults
A 25-year-old door with a bad seal, a sagging hinge and a soft bottom rail isn’t three repairs. It’s a replacement wearing a disguise. Same call when a door has been repaired repeatedly in a short span.
Fire-rated doors with a compromised label
Different rules entirely. If the label is painted over, missing, or the door has been modified, it may no longer be compliant regardless of condition. See Ontario fire-rated door code requirements and fire exit doors.
Quick decision table
| What you’re seeing | Call | Why |
|---|---|---|
| Dent, skin not breached | Repair | Filler + refinish; core intact |
| One bad hinge or lock | Repair | Hardware, not the door |
| Draft, square frame | Repair | Weatherstripping only |
| Cracked glass lite | Repair | Insert swaps out |
| Surface rust, no perforation | Repair | Grind, treat, refinish |
| Rust visible through the skin | Replace | Core already compromised |
| Slab flexes 1/4″+ | Replace | Delaminated core |
| Frame racked or rotted | Replace | New slab would fail early |
| 25+ yrs, multiple faults | Replace | Repair exceeds 30% rule |
| Fire label compromised | Replace | Compliance, not condition |
Residential vs commercial
On a house, the decision is mostly cost and curb appeal. On a commercial opening, a door that doesn’t latch is a security and insurance problem, and a hollow metal door in a high-traffic entry wears far faster. We cover both — residential door repair and commercial door repair. For storefronts specifically, see storefront entry doors and our 2026 commercial cost guide. Regular servicing pushes the replace date out — that’s the case for commercial door maintenance.
How to make your steel door last longer
- Rinse the bottom rail in spring. Road salt sitting on steel is what starts the rust you’ll see in five years.
- Touch up paint chips right away — bare steel is an open door for corrosion.
- Tighten hinge screws once a year. Sag is cumulative and preventable.
- Replace weatherstripping when it hardens, not when it fails. Water intrusion is what delaminates cores.
- Keep the sweep and threshold sealed so meltwater doesn’t wick up into the slab.
More seasonal context: common door problems in Toronto’s weather, why doors stick in summer, and 10 signs your door needs immediate repair.
FAQ
Can a rusted steel door be repaired?
Surface rust that hasn’t perforated the skin, yes — grind, treat, refinish. Rust visible through the skin, no. It started inside, and the core is already gone.
Is it cheaper to repair or replace a steel door?
Repair is almost always cheaper up front. It stops being the better value once repair passes roughly 30% of replacement cost on a door over 15 years old, or when the frame is involved.
Can you replace just the slab and keep the frame?
Only if the frame is still plumb, level and square. If it’s racked, you’re setting the new door up to fail.
How long does a steel door last in the GTA?
Maintained well, a good steel door lasts a long time. Neglected — especially the bottom rail against road salt — the core can be compromised well before the door looks bad.
Do you repair after a break-in?
Yes, same day. See break-in repairs and emergency door repair.
Not sure which one you’ve got?
We’ll tell you straight — repair if it can be repaired.
20+ years, 120+ 5-star reviews, licensed & insured, warranty on every job. 24/7 same-day service across Toronto & the GTA.
Send a photo of the door and we’ll usually tell you repair-or-replace before we even roll a truck.
Service areas
We handle steel door repair and replacement across the GTA:
Etobicoke ·
North York ·
Scarborough ·
Vaughan ·
Markham ·
Richmond Hill ·
Mississauga ·
Oakville ·
Hamilton ·
Toronto.
See what customers say on our reviews page or check the FAQ.
