French Doors & Double Doors: Measuring for Furniture Moves

Types of Double-Leaf Doors

Active Leaf vs Inactive Leaf

On most double doors, one leaf is the "active" leaf — the one with the handle that you use daily. The other is the "inactive" leaf, which is typically bolted at the top and bottom with flush bolts (slide bolts recessed into the door edge). To open the inactive leaf, look for the flush bolts at the very top and very bottom of the door edge. Slide them to the unlocked position, and the inactive leaf will swing freely. If you cannot find flush bolts, the inactive leaf may be secured with a surface bolt visible on the face of the door, or with a removable astragal.

What Is an Astragal and How to Remove It

The astragal is the vertical strip between the two door leaves. It serves as a weatherseal and a mounting point for the lock strike. On exterior doors, the astragal is critical for weather protection. On interior French doors, it is often purely decorative. There are two types:

• Attached astragal — screwed or nailed to the inactive leaf. Remove the screws to detach it. This is the most common type and the easiest to remove.
• T-astragal (overlapping) — a T-shaped strip that overlaps both doors. It may be screwed to one leaf or to the frame header. Look for screws along its length.
• Integrated astragal — built into the door edge itself. This cannot be removed without damaging the door. On these doors, the astragal width (typically 1 to 1.5 inches) reduces the clear opening permanently.
• Removing an attached astragal adds 1 to 2 inches of clear width between the two leaves.

How to Measure Double-Leaf Door Clear Opening

• Open both leaves fully (90 degrees). Release all flush bolts and slide bolts on the inactive leaf.
• If there is a removable astragal, remove it for maximum clearance.
• Measure the full clear width from jamb to jamb — this is your maximum clear opening with both leaves open.
• Subtract any hinge intrusion on both sides (1.5 to 2 inches per side, or 3 to 4 inches total).
• If you cannot open the inactive leaf, measure the active leaf clear opening only — treat it as a single door.
• For furniture planning, also measure the approach: can you swing both leaves open simultaneously, or does one block a hallway or wall?

Sliding Patio Doors — The Trap

Sliding patio doors are the most commonly misunderstood door type for furniture moves. Even though the total frame may be 72 inches wide, only one panel slides, giving you a clear opening of approximately 34 to 36 inches — roughly the same as a single entry door. You cannot remove the fixed panel without professional help and risk of glass breakage. If you are moving large furniture and your only wide opening is a sliding patio door, treat it as a single-door-width opening and measure accordingly.

Furniture That Benefits Most From Double Doors

Tips for Moving Through French Doors

• Always open both leaves before starting — do not try to fit furniture through one leaf if both can open.
• Remove the astragal for maximum clearance, especially for items wider than 50 inches.
• Protect glass panes with moving blankets or cardboard taped to the glass. French door glass is expensive to replace.
• Watch for the threshold — exterior French doors often have a raised threshold or track that adds an obstacle at floor level.
• If the approach is a tight hallway, you may need to angle furniture through even with both leaves open. Measure the approach angle too.
• Reinstall the astragal and close the inactive leaf when done — leaving flush bolts disengaged is a security risk on exterior doors.