A gate that drags on the ground or catches on the latch side is one of those frustrating problems that tends to get worse over time. The good news is that most dragging gates can be fixed with basic tools and a bit of patience — no specialist licence required. Here's how to work out what's gone wrong and sort it out properly.
Why Is My Gate Dragging?
Before you grab a spanner, it pays to understand the root cause. The most common culprits are:
- Loose or worn hinges – screws work loose over time, especially in timber posts that have dried and shrunk.
- A leaning or rotted gate post – if the post has moved, the whole gate drops with it.
- A warped or twisted gate frame – timber gates can rack out of square after years of sun and rain exposure.
- Subsidence or ground movement – NZ's varied soils (especially in clay-heavy areas) can shift posts seasonally.
- Hinge corrosion – salt air in coastal areas accelerates rust and wear on hinge knuckles.
Take a good look at the gate from the side and from above. Use a spirit level on the hinge post and check whether the gate frame itself is still square by measuring corner to corner diagonally.
Tools and Materials You'll Need
- Spirit level
- Tape measure
- Cordless drill/driver
- Screwdrivers (flat and Phillips)
- Adjustable spanner or socket set
- Timber screws (longer than the originals, or coach screws for heavy gates)
- Timber filler or Sika construction adhesive for stripped holes
- Replacement hinges if needed
- Rapid-set concrete (for resetting a post)
- Safety glasses and gloves
You'll find a good range of hinges, fasteners, and rapid-set concrete at Bunnings or Mitre 10.
Step 1 – Check and Tighten the Hinges
This is the quickest fix and should always be your first step.
- Open the gate and support it on a block or have a helper hold it at the correct height.
- Check every hinge screw. If screws spin without gripping, the holes are stripped.
- Fix stripped screw holes by removing the hinge, packing the hole with a timber plug (a short piece of dowel glued in with PVA) or a squirt of Sika construction adhesive mixed with sawdust. Let it cure fully before re-driving screws.
- Upgrade to longer, thicker screws or coach bolts where possible — this makes a big difference on heavy gates.
- Rehang the gate and check the swing.
Step 2 – Adjust or Replace the Hinges
If the hinges themselves are bent, corroded, or the wrong type for the gate weight, replace them. When choosing new hinges:
| Gate Type | Recommended Hinge |
|---|---|
| Light timber picket gate | 75–100 mm butt or strap hinge |
| Medium timber or steel gate | 100–150 mm heavy strap or weld-on hinge |
| Heavy driveway gate | Adjustable ball-bearing hinge or weld-on pivot |
| Automated gate | Manufacturer-specified pivot or hinge |
For adjustable hinges, you can dial in the height and angle without removing the gate — very handy for fine-tuning.
Step 3 – Straighten or Reset a Leaning Post
If the hinge post has leaned toward the gate, the gate will drop on the latch side. This is a more involved fix but still very DIY-friendly.
- Dig around the base of the post to expose the footing.
- Check whether the post is rotted at the base — if so, the post needs replacing entirely. Use a H4 or H5 treated timber post for in-ground use (as required by NZS 3604 for timber framing in contact with the ground).
- If the post is sound, lever it back to plumb using a fence post bar, brace it temporarily with stakes, and re-pack the hole with rapid-set concrete.
- Allow the concrete to cure fully (check the bag instructions — usually at least a few hours before loading the gate).
Step 4 – Square Up a Racked Gate Frame
A timber gate that has racked out of square can often be corrected with a diagonal timber brace or a tension wire.
- A timber brace should run from the bottom hinge corner to the top latch corner — this is the direction that fights the sag.
- A galvanised tension wire with a turnbuckle does the same job and is easier to adjust.
- If the gate is badly warped, it may be more cost-effective to build or buy a new gate frame.
Step 5 – Final Adjustments and Checks
Once re-hung, swing the gate through its full arc several times. Check that:
- It clears the ground by at least 20–30 mm (more if the ground is uneven or you get heavy rainfall runoff).
- The latch engages cleanly without lifting or forcing.
- The gate stays open on its own if that's what you need (adjust hinge tension or add a gate stop).
- All fixings are tight and any exposed timber end-grain is sealed with a timber preservative or paint to prevent moisture ingress.
For painting or finishing, Resene and Dulux both offer exterior timber paints and stains well suited to NZ conditions.
When to Call a Professional
Most gate re-hanging is straightforward DIY work. However, consider calling a qualified handyman or fencer if:
- The post is badly rotted and needs full replacement with concrete footing work.
- You have a heavy automated or electric gate — wiring and motor work may involve restricted electrical work that must be carried out by a registered electrician (see EWRB).
- The gate is part of a retaining wall or structural fence that may require a building consent under the NZ Building Code.
- You're simply not confident working with post-hole digging or concrete.
You can find experienced local handymen and fencing tradespeople on tradedirectory.co.nz.