Can I Replace a Broken Glass Panel in a Wardrobe Sliding Door?

Yes, replacing a broken glass panel in a wardrobe sliding door is a job many confident DIYers can tackle — but it pays to understand the type of glass required, how to handle it safely, and when the job is better left to a professional glazier. Get it right and you'll have a safe, good-looking result without a big bill.

Understand the Type of Glass You Need

This is the most important step. Wardrobe sliding doors in NZ homes are typically fitted with one of the following:

• Toughened (tempered) safety glass – This is the most common and is required in many locations under the NZ Building Code. When broken, it shatters into small, relatively harmless pebbles rather than dangerous shards.
• Laminated safety glass – Holds together when broken thanks to an interlayer. Less common in wardrobes but used in some premium systems.
• Standard float glass – Older wardrobes may have this, but it is generally not compliant for new installations in areas where safety glazing is required.

NZ Building Code clause G12 and the associated standard NZS 4223 set out where safety glass is required. Wardrobe doors that are large enough to be mistaken for a doorway, or that are in certain locations, will typically require toughened or laminated safety glass. Check with your local council or a licensed glazier if you're unsure what's required for your specific situation.

Safety note: Never replace safety glass with standard float glass. Doing so could create a serious injury risk and may not comply with the Building Code.

Tools and Materials You'll Need

• Replacement toughened safety glass (cut to size — see below)
• Tape measure and notepad
• Thick work gloves and safety glasses
• Utility knife or flat-head screwdriver
• Rubber mallet
• Glazing tape or rubber glazing strip (to match existing)
• Vacuum cleaner and stiff brush for cleanup

Step 1 — Remove the Sliding Door Panel

Most wardrobe sliding doors lift up and swing out from the bottom track. Lift the door firmly upward into the top track, then swing the base out and lower it free. Lay the door flat on a padded surface (old blankets work well) to avoid scratching the frame.

Step 2 — Remove the Broken Glass Safely

Wear thick leather gloves and safety glasses throughout this step. If the glass is toughened, it will likely have already broken into small pieces — carefully collect these in a cardboard box for disposal. If larger shards remain:

• Tape the broken glass with masking tape before removal to reduce scatter
• Gently tap remaining pieces inward with a rubber mallet
• Vacuum the frame channel thoroughly once clear

Dispose of broken glass wrapped in newspaper inside a cardboard box, clearly labelled — do not put loose glass in a recycling bin.

Step 3 — Measure the Opening Carefully

Measure the rebate opening (the visible opening inside the frame) in both width and height. Measure at least twice. Glass is typically cut 3–5 mm smaller than the rebate on each dimension to allow for the glazing tape or rubber strip — but check the existing glazing strip thickness and follow the manufacturer's recommendation for your specific door system.

Note the glass thickness of the original panel (commonly 4 mm or 5 mm for wardrobe doors).

Step 4 — Order Your Replacement Glass

You cannot cut toughened glass yourself — it must be ordered pre-cut to size from a glazier or glass supplier. Take your measurements to a local glass supplier or glazing company. They will cut and toughen the glass to your specifications. This usually takes 2–5 working days depending on the supplier.

As a rough guide, a single cut-to-size toughened panel for a wardrobe door might cost anywhere from $80 to $250+, depending on size and thickness — but get a quote from your local supplier as prices vary.

Step 5 — Reglaze the Panel

Once your new glass arrives:

1. Apply fresh glazing tape or rubber glazing strip around the frame channel, replacing any old or damaged material.
2. Carefully lower the new glass into the frame, keeping it centred.
3. Press the retaining beads or strips back into place firmly by hand or with a rubber mallet.
4. Check the glass sits evenly with no rocking.

Step 6 — Rehang the Door

Rehang the door by reversing the removal process — insert the top into the upper track first, then swing the base into the lower track. Check the door slides smoothly and adjust the roller height if needed (most rollers have a small adjustment screw).

When to Call a Professional

Call a qualified glazier if:

• You are unsure what type of glass is required under the NZ Building Code for your situation
• The door frame is damaged or warped and needs repair
• The panel is unusually large or heavy (a two-person job at minimum, and often better handled professionally)
• You are not confident handling glass safely
• The door is part of a fire-rated assembly

Glaziers are not legally restricted tradespeople in the same way electricians or plumbers are, but they are skilled professionals with the right tools and insurance. You can find a qualified local glazier on tradedirectory.co.nz.

Sources & Further Reading

• MBIE Building Performance – NZ Building Code
• BRANZ – Building Research
• WorkSafe NZ – Safe handling of glass
• Standards NZ – NZS 4223 Glazing in Buildings
• Bunnings – Glazing supplies and tools
• Mitre 10 – Glazing tape and hardware