The Door That Stays Shut Does the Hardest Work in French Door Hardware

This article is about the common arrangement of a pair with one active leaf and one inactive leaf. In that setup, French door hardware is two different kits that can look like one. The active leaf, the door you open every day, gets a working knob or lever with a latch, and a lock if the doors are exterior. The inactive leaf often gets dummy trim that does not turn, plus bolts at the top and bottom that hold it to the frame. Other arrangements exist: catches and dummy pulls on both leaves, or manufacturer-specific locking systems, and none of these is a universal requirement. Flush bolts are one option for the bolts; surface and cremone bolts are others, covered below. The condition that changes everything: if the pair is an exterior French or patio door, find out whether it already has a multipoint lock built in by the door maker before you buy anything, because then the hardware has to fit that lock and an ordinary set will not.

The inactive leaf is the frame the active leaf closes against

On a single door, the latch slides into a strike in the jamb, and the jamb is nailed to the house. On a pair, there is no jamb in the middle. The active leaf latches into the edge of the inactive leaf, so the inactive leaf has to stand in for a doorframe, and its bolts are what secure its meeting edge in this arrangement.

You can see this with the doors in front of you. Close both leaves, latch the active one, leave the bolts on the inactive leaf disengaged, and push gently on the meeting stiles. Both doors move together, latch and all. Now engage the bolts and push again: the pair stays put. That small demonstration is the whole logic of French door hardware. In this arrangement, the lever on the active leaf depends on the bolts on the other one.

It also explains a familiar complaint about French doors: a pair that rattles, drifts open or will not stay latched. Before blaming the lever, check whether the bolts actually reach their holes in the head of the frame and in the floor or sill. A bolt that has stopped engaging, or a hole that has filled with dirt, turns the inactive leaf into a second loose door.

French door knobs and handles on the inactive leaf: dummy trim that matches

Dummy trim is a knob or lever that is fixed to the door and operates nothing. It is there so the inactive leaf can be pulled open on the rare day you need the full opening, and so the pair can read as symmetrical. Mounting varies by product: some dummy sets are surface mounted, others use through-bolts or need door preparation. Order the single or paired dummy configuration the specific product calls for, rather than automatically ordering two singles.

Three details catch people out.

• Handing. Levers are usually handed. On a pair, the dummy lever on the inactive leaf is the mirror image of the working lever, so it is ordered in the opposite hand. Some levers are reversible; check the listing rather than assuming.
• Height and rose. The dummy should sit at the same height as the working set, with the same rose or backplate, so the two leaves line up across the meeting stiles.
• Clearance. With both doors closed, the two knobs or levers sit close together at the middle of the pair. Check that a hand fits around the working knob without hitting the dummy beside it.

Buy the working set and the dummy trim from the same collection in the same finish. On a pair of doors, side by side at the same height, even a small difference in color or sheen shows.

Flush bolts, surface bolts and cremone bolts

In this arrangement the inactive leaf is held shut by bolts at the top and bottom. There are three common ways to do it, and they differ in how much hardware you see and how much work goes into the door.

Flush bolts

A flush bolt is set into a slot cut in the meeting edge of the inactive leaf, near the top and near the bottom. You slide a small lever up or down and the bolt drops into a hole in the floor or sill, or rises into the head of the frame. With both doors closed, nothing shows at all. That is the appeal: the pair looks like two doors with matching trim, and the bolts disappear. Whether they suit your doors depends on existing door preparation, accessibility, how often the inactive leaf is opened, and the door maker's requirements. The tradeoff is precision. The edge has to be cut cleanly, and the bottom bolt needs a hole in the floor or threshold, which matters if the floor is stone or has radiant heat beneath it.

Surface bolts

A surface bolt mounts on the face of the door, with a keeper on the frame or floor. It is easier to retrofit, because nothing is cut into the edge, and on a rustic or traditional door it can be part of the look. Rocky Mountain Hardware makes surface bolts with decorative mounting brackets in several bolt sizes, and among our door bolts you will find those alongside flush bolts and cremone sets. The cost is that you see them, and on a door with glass close to the edge, a surface bolt may not have room to mount.

Cremone bolts

A cremone bolt runs a rod the full height of the inactive leaf, driven by a knob or lever in the middle, so one turn throws the bolts at the top and bottom together. It is the answer when the inactive leaf gets opened often, because nobody has to reach the head of the frame or bend to the floor. It is also the most visible of the three, a long piece of hardware running up the door. Visible surface or cremone bolts can be an intentional design choice, not a compromise.

Narrow stiles, glass and the backset you actually have

French doors are mostly glass, and the wood around the glass, the stile, is often narrow. Hardware has to fit in that strip without crowding the glass or the other leaf. Backset, how far in from the meeting edge the knob or lever sits, measured to its middle, is one measurement to check, but it does not decide fit on its own. Check plate width and position, mounting holes, lock preparation and clearance from glass and molding against the product's template. Emtek's standard backset on its narrow-trim sideplate locks is 2-3/8 in, with 2-3/4 in available by request.

For doors with narrow stiles, a sideplate lock is often the cleaner fit. Instead of a round rose, the knob or lever and its lock sit on a long, slim plate. Emtek's Stretto narrow-trim sideplates, for example, come in 1-1/2 in by 11 in or 2 in by 10 in, need their own door preparation, and are offered keyed or non-keyed. A slim plate can help on a narrow stile, but it does not make an incompatible lock fit; confirm against the template. You will find these with our lever and knob entry and patio sets.

Exterior French door hardware: check the lock inside the door first

Exterior French and patio doors are often sold with a multipoint lock already built into the edge of the active leaf: one mechanism that throws bolts or hooks at several points along the door when you lift the handle or turn the key. If your door has one, the hardware you buy is trim made to fit that particular lock, not a standard door set. Emtek's multipoint trim, for instance, is sold by configuration matched to the brand of door, will not fit doors bored for standard knobs, and assumes a 1-3/4 in door unless specified otherwise.

So before choosing a style, find the door maker's name and the lock's model, often stamped on the faceplate in the door's edge or listed in the door's paperwork. Then match the trim to the actual lock model, spindle-to-cylinder spacing, cylinder type, handing and trim mounting configuration. If the door has no multipoint lock, the active leaf takes a keyed entry set or a keyed sideplate lock, and bolts on the inactive leaf become part of how the pair stays shut. How secure any of this is depends on the door, the frame and the installation, not on the hardware alone; ask your installer or the door's maker what the door was built to take.

Dummy knobs for French doors

Dummy knobs are fixed knobs with no latch, made for the inactive leaf. Buy them from the same collection, finish and size as the working knob on the active leaf, and mount one on each face of the inactive door at the same height. They hold nothing shut, so in this arrangement the inactive leaf still needs its bolts or another securing method.

French door pulls

Pulls suit a pair that is held shut by catches or bolts rather than a latch, such as an interior pair that is pulled open and pushed closed. In that case both leaves can carry matching door pulls mounted at the same height. A fixed pull does not operate a latch itself, but it can be part of a compatible handleset or another purpose-designed locking arrangement, so check the specific product.