How to Stop Hearing Your Neighbours Through Shared Walls

Last updated: April 2026 · 9 min read

Hearing your neighbour's TV, music, or conversations through a shared wall is one of the most common apartment complaints. The good news: wall noise is airborne noise, which is easier to treat than impact noise. The strategies below are ordered from simplest to most effective, and every one of them is renter-safe.

Why You Can Hear Through the Wall

Most interior apartment walls are just two layers of drywall separated by an air gap with thin wood or metal studs. This is fine for privacy in a detached house, but in a shared building it means sound waves pass right through. The drywall vibrates like a drum head, transmitting your neighbour's bass, voices, and TV audio directly into your space.

The three principles that reduce wall noise are: adding mass (heavier barriers vibrate less), adding absorption (soft materials soak up sound energy), and sealing gaps (closing the flanking paths where sound sneaks around the wall). An effective plan uses all three.

Step 1: Find and Seal the Gaps

Before adding anything to the wall, check for the easy wins. Sound travels through surprisingly small openings:

• Electrical outlets and switch plates on a shared wall are often back-to-back with outlets on the other side, with nothing between them but air. Acoustic putty pads placed behind the cover plate seal this gap without any wiring changes.
• Baseboards frequently have a gap between the wall and floor. A bead of acoustic sealant or removable caulk along the baseboard edge closes this flanking path.
• Air vents and ducts can carry sound between units. You cannot block a vent entirely (fire code), but acoustic vent covers with labyrinth baffles reduce noise transmission while still allowing airflow.

Step 2: Add Mass With Furniture

A heavy, filled bookshelf against a shared wall is one of the most effective renter-friendly sound barriers. Books are dense, and a full bookshelf provides several inches of mass between you and your neighbour. Place the tallest, heaviest pieces of furniture against the problem wall.

Ideally, the shelf should cover as much of the wall as possible, floor to ceiling. Leave no gap between the shelf and the wall. You can add a layer of mass-loaded vinyl or a thick moving blanket behind the bookshelf for even better results. This is invisible once the shelf is in place.

Step 3: Hang Mass-Loaded Vinyl (MLV)

Mass-loaded vinyl is a thin, flexible, extremely dense material designed specifically for soundproofing. A single layer of 1-pound-per-square-foot MLV on a shared wall can reduce noise transmission by 20 to 30 decibels, depending on the wall construction.

For renters, MLV works best when hung behind furniture or underneath a decorative tapestry. You can attach it to the wall using heavy-duty Command strips along the top edge and let gravity hold the rest flat. It is not the prettiest solution on its own, but hidden behind a bookshelf or covered by a wall hanging, it is invisible.

Step 4: Mount Acoustic Panels

Acoustic panels serve a dual purpose: they absorb sound that has already entered your room (reducing echo and reverberation) and they add a small amount of mass to the wall. On their own, they are not as effective as MLV for blocking transmission, but combined with the other strategies, they make a meaningful contribution.

Place panels at ear height on the shared wall, focusing on the area where you hear the most noise. Dense fibreglass panels (like Owens Corning 703 wrapped in fabric) outperform cheap foam tiles by a wide margin. For a budget option, thick decorative felt panels offer a middle ground.

Step 5: Use a White Noise Machine or Fan

Even after adding mass and sealing gaps, some sound will still get through. Sound masking is your final layer of defence. A white noise machine placed near the shared wall raises the ambient background level just enough that your neighbour's muffled voices or TV become unnoticeable.

For living rooms, you might prefer a tower fan or air purifier that produces a natural hum. For bedrooms, a dedicated sound machine gives you more control over volume and tone. The goal is not to drown anything out, just to narrow the gap between background and intrusion.

What About Soundproof Curtains on Walls?

Floor-to-ceiling curtains hung on a wall-mounted rod can add a layer of mass and absorption. They work best if the curtain is thick (triple-weave or thermal blackout), hung with an air gap of 2 to 4 inches from the wall surface, and covering the full width. The air gap is what gives this approach its effectiveness: the curtain absorbs airborne noise, and the trapped air layer provides additional insulation.

This approach is more aesthetically pleasing than MLV or acoustic panels and can serve double duty as a decorative feature. It is less effective per dollar than MLV, but far easier to install and remove when you move out.

The Complete Wall Treatment Stack

For maximum noise reduction on a shared wall, layer these approaches in order:

1. Seal outlets with acoustic putty pads and caulk the baseboard gap.
2. Hang mass-loaded vinyl on the shared wall (behind furniture).
3. Place a heavy, filled bookshelf against the wall.
4. Add acoustic panels at ear height on any exposed sections.
5. Run a white noise machine to mask whatever gets through.

Each layer adds roughly 3 to 10 decibels of reduction. Combined, you can realistically achieve 15 to 25 decibels of improvement, which is the difference between clearly hearing a conversation and hearing a faint mumble you can easily ignore.