French Door Glass Replacement: DIY, Cost and When to Call

How-to · 3 min read · Updated October 2026

Yes, the glass in a French door can be replaced, and it costs far less than a new door. A single pane is a job many people can do. A double-pane unit is heavy, needs a good seal and is better left to a pro.

The first thing to find out is which kind of glass you have. Fog between the panes means a different repair than a crack.

Decision card for French door glass: single pane replacement can be DIY if you are comfortable, a double pane unit is a job for a pro, and fog between the panes means the seal failed and the whole unit needs replacing — Single pane is the DIY-friendly case. Based on: Hotian Windows’ French door repair guide.

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Single pane, double pane or fogged?

Hotian Windows splits it three ways. A single pane is a job you can do yourself if you are comfortable with it.

A double-pane insulated unit is heavy and needs proper sealing, so Hotian suggests a door repair specialist, a restoration carpenter or a glass company.

If you see fog or moisture between the panes, the unit’s seal has failed. Hotian says the whole unit needs replacement and a foggy unit cannot be repaired.

What it costs

Fixr’s glass replacement cost guide puts French door glass at $200 to $400 per pane, for the material only. Labor adds about $50 to $125, and each pane takes roughly 45 to 60 minutes to install.

Key facts card: French door glass costs 200 to 400 dollars per pane for the glass alone, labor adds 50 to 125 dollars, and each pane takes 45 to 60 minutes to install — Glass is the bigger part of the bill. Source: Fixr, updated August 2025.

Fixr’s tables are mixed between “material only” and “labor included,” so confirm which one a quote means. Hotian’s rough range for hardware or a single pane is $100 to $300 or more.

How to replace a single pane

Put on thick gloves and safety glasses. Tape the cracked glass and take out the large pieces first.
Remove what holds the glass in: pry off wood stops, soften or chip away glazing putty, or pry out vinyl beads.
Lift out the glass, scrape out the old putty or sealant and clean the opening.
Set the new glass, then put the stops or beads back, or apply putty.
Clean up extra putty or caulk and let putty skin over before painting.

Measure the width and height of the opening where the glass sits. Hotian suggests deducting about 1/8 inch from each for clearance, but check with your glass supplier.

For a double-pane unit, also measure its thickness. It sits on small rubber setting blocks, and butyl or glazing tape is often used behind the stops.

Order tempered glass

Door glass should be tempered safety glass, according to Hotian, which is often etched in a corner. Tell the glass shop it is for a door, so they cut the right type.

White French doors with glass panes beside a large potted plant — Match the new glass to the old, and keep the style of the panes. Photo: Yessi Trex on Pexels.

When to replace the door instead

Replace the whole door when damage is widespread, such as rot through the panels or frame, or when the door is badly warped. Hotian also lists a failing core and repair costs close to the price of a decent new door.

Fix it or replace it · James Davis

If only one pane is cracked and the wood is sound, I would repair it. If the glass is the fifth thing wrong with the door, I would price a new one before spending on the glass.