Most heavy steel gates that drag, sag or snap can be repaired on site with new hinges, a welded-up hinge bracket, a diagonal brace or a reset post. Replace the gate when the frame itself is rusted through or badly bent, or when it has simply become too heavy for the posts holding it up. Where it failed tells you which job it is.
A recent enquiry described a gate that was always very heavy and hard to open and close, until it finally snapped. Being mobile welders, we repair gates where they hang, on house blocks and on farms. Here is how to read what has gone wrong before you ring.
Why heavy gates fail
A swinging gate is a lever. All its weight hangs off the hinge side, and the top hinge is pulled outward every time the gate swings, stops or gets leaned on. Over years that shows up in a few predictable places:
- Hinges wear. Pins and barrels wear oval, the gate drops, the latch side starts to drag.
- Hinge welds crack. The bracket on the post or the gate takes the load. A small crack grows until it lets go, often when the gate is swung hard.
- The post leans. A post that is too light, set too shallow, or rusting at ground level tips toward the gate. Clay soils that swell in winter and shrink in summer make it worse.
- The frame racks. Without a diagonal brace, a long gate turns into a parallelogram and the far end drops.
- Rust where water sits. Bottom rails and the base of posts rust from the inside out.
Read the symptom
| What you see | Likely cause | Usual fix |
|---|---|---|
| Latch side drags, gate still square | Worn hinges or leaning post | New or adjustable hinges, or reset the post |
| Gate has gone out of square | No brace, or a broken brace weld | Weld in a diagonal brace |
| Snapped at a hinge | Fatigue crack at the hinge bracket | Cut back and weld a new bracket, often with a plate |
| Post leaning, gate fine | Footing too small or post rusted at ground | New post, bigger and deeper footing |
| Holes or flaking in rails | Rust from trapped water | Cut out and weld in new steel, or replace |
What we can fix on site
- Re-hang the gate on new hinges, or adjustable hinges so it can be trued up later.
- Weld cracked hinge brackets and reinforce them so they do not crack in the same place.
- Add a diagonal brace, running from the bottom of the hinge side up to the top of the latch side, to stop a long gate sagging.
- Fit a wheel to a long farm or driveway gate so the end is supported.
- Replace a leaning or rusted post with a heavier one in a bigger footing.
- Cut out rusted sections of rail and weld in new steel, then realign the latch.
When a new gate is the better job
- The main frame members are rusted through in several places.
- The gate is bent or twisted from a vehicle hit and will not sit flat.
- Cladding or sheeting has been added over the years and the gate is now too heavy for its posts and hinges.
- You want to automate it. A gate motor works harder and wears faster on a gate that drags, so the gate has to swing freely by hand first.
A new custom gate comes out of our Mount Pleasant workshop built to the opening, with the posts sized to suit. See metal fabrication for the kind of one-off steel we make.
Pool gates: fix them first
If a sag means a pool gate no longer closes and latches on its own, fix it straight away. Consumer and Business Services SA says to make sure your pool fence has a self-closing, self-latching gate in working order.
What to send us
Photos of the hinge side, the post at ground level and the latch, plus the gate's width and what it is made of. That is usually enough for Sean to tell you whether it is a repair, and what it will take. Gate and yard repairs are part of our welding repairs work across the Hills, the Barossa and the Murraylands, including Mannum and Strathalbyn.
Common Questions
Can a broken steel gate be welded on site?
Usually, yes. Cracked hinge brackets, broken braces and rusted rail sections can be welded where the gate hangs with a mobile welding rig. If the post is the problem, it is replaced and re-footed on site as well.
Why does my heavy gate keep sagging?
Most often worn hinges, a post leaning in its footing, or a frame with no diagonal brace. The weight on the hinge side levers the gate down over time. Fixing the cause, not just lifting the gate, stops it coming back.
Should I put a wheel on a long gate?
On long driveway and farm gates a wheel takes load off the hinges and post. It needs a reasonably level, firm path to run on. Fixing a weak post or missing brace still matters.
Is it worth repairing an old steel gate?
If the main frame is sound, yes: hinges, brackets, braces and posts are straightforward repairs. If the frame is rusted through in several places or badly bent, a new gate is usually the better job.
Related Iron Works Pages
Sources
Rules checked on 19 October 2026. Pool safety rules change, so check the current advice from Consumer and Business Services or your council.
