Can French Doors Be Soundproof? What Actually Helps

Fix it · 3 min read · Updated October 2026

Can French doors be soundproof?

Quieter, yes. Silent, no. French doors are mostly glass, and sound gets through the glass and the gaps around it. You can improve a pair a lot by sealing the gaps first, then looking at the glass.

Typical sound ratings in STC: hollow core door about 17, single-pane glass 26 to 28, sealed solid core door about 28, double-pane glass 26 to 35, window inserts 48 to 54 — Typical STC ratings; a higher number is quieter. Sources: Bob Vila, Family Handyman.

This page covers where the noise comes in, what to fix first, and when it is worth replacing the doors.

Table of Contents

Where the noise gets in

A sound barrier is only as good as its weakest point. Family Handyman’s example is a 50-STC wall with a 20-STC door: most of the benefit is lost through the door. The same logic applies to a French door, where the glass and the gaps around two leaves set the ceiling.

A field test by an acoustics firm found the base of a door measured 9 decibels louder than the wall around it, even with door sweeps fitted. It also puts a standard hollow core interior door at STC 24 to 32 and a solid core door at STC 32 to 36 (Commercial Acoustics). Sources differ on the same door type, so use these as a guide and check the maker’s tested number.

Seal the gaps first

Gaps are the cheapest fix. Seal between the jamb and the wall framing, then add weatherstripping gaskets and a door sweep. Family Handyman says a typical hollow-core or wood-panel door has an STC of about 17, and that sealing and gaskets can raise it to 20, an easy and noticeable improvement that may not be enough.

Five steps to quiet French doors: seal the jamb, add weatherstripping, fit a door sweep, use acoustic caulk and hang heavy curtains — Start with the cheap steps. Sources: Family Handyman, Bob Vila.

Small gaps between a frame and the wall can let noise in and stop a window or door from reaching its rating. Bob Vila recommends acoustic caulk for those gaps. It stays flexible, so it does not crack as the frame moves.

The glass sets the ceiling

On windows, single-pane glass has an STC of 26 to 28, and double-pane glass 26 to 35, because the air space between panes helps stop sound passing through. Soundproofing window inserts reach 48 to 54 STC. These are window figures, so do not expect the same numbers from a door.

If the doors are being replaced, ask the maker for the tested STC of the whole door unit and for an acoustic glass option. Look for lab data on the exact product, not a general claim.

Our take · Octopus Doors

Seal first, because a few dollars of gasket and caulk get you most of the easy gain. If the room still isn’t quiet enough, the doors are the problem, and the honest answer is a rated unit rather than more curtains.

What curtains do

Sound-dampening curtains are made of thick, heavy fabric, often lined with vinyl, and usually cost $20 to $60 per panel. They soften echoes and noise but do not block sound entirely (Bob Vila). They help a room feel calmer, and they are not a substitute for sealing.

Close-up of dark gray pyramid acoustic foam panels covering a wall — Acoustic foam absorbs echo inside a room. It does not stop sound passing through a door.

When to replace the doors

To get a door above about STC 20, you have to replace the door and the jamb. Family Handyman puts a well-sealed solid core wood door at about STC 28, and says acoustical wood doors in the 30 to 50 range are available from suppliers that serve commercial construction. A pair of glazed French doors is unlikely to match a solid door, so ask the supplier for the glazed unit’s actual rating.