History of French Doors: Definition and Origins Explained

Explainer · 2 min read · Updated October 2026

French doors are a pair of glass-paned doors hinged at opposite sides of an opening, so they open in the middle. They grew out of tall casement windows that people could walk through.

Sources agree on that much. They disagree on dates, so I flag where the evidence is thin.

French doors through time: medieval casements, tall windows opening onto balconies in the 1500s, 70 installed at Versailles in the 1680s, stock pairs sold in the US around 1900 — Four points on the timeline. Sources: Britannica, Buffalo Architecture dictionary, Hunker, 2020.

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What counts as a French door

The Buffalo Architecture dictionary defines them as a pair of adjoining doors with glass panes from top to bottom, hinged so they open in the middle. The panes sit in orderly rows held by muntins.

The French name is porte-fenêtre, which means door-window, according to Hunker.

What makes a French door: two doors hinged at opposite sides, glass panes from top to bottom, panes held by muntins, opens in the middle, French name porte-fenetre — The features that define the style. Sources: Buffalo Architecture dictionary, Hunker.

Where they came from

Britannica calls the casement the earliest form of movable window. It says the French casement has two leaves that meet in the middle and open inward, and that the doorlike form reached the US for balcony and porch access. It gives no dates for that move.

The Buffalo dictionary says the earliest examples were floor-to-near-ceiling casements. It says Louis XIV had 70 installed in the Hall of Mirrors at Versailles in the 1680s, opening onto the garden.

Hunker credits Italian architects of the 1500s with tall windows that doubled as balcony doors, and says the French added the divided panes. That story rests on a single window company’s blog, so treat it as a likely account, not a settled fact.

White French doors opening onto a balcony with an iron railing — The balcony pair is the old idea in a modern house. Photo: Nuno Gonçalves on Pexels.

How they reached ordinary US homes

The same dictionary entry says French doors came into widespread use around 1900, in the bungalow era, when builders’ supply houses sold paired and single stock versions.

Then they served as room dividers that kept some privacy while passing light. Typical spots were between a parlor and an entry hall, or linking living and dining rooms. Today they more often open the back of a house onto a patio or garden.

My call · James Davis

If you want the period look, copy the details that stayed the same: divided lights and a pair that opens in the middle. Skip the faux grids glued on a single sheet of glass if the house is old.