Soundproofing a shared wall comes down to four principles: adding mass, adding damping, decoupling the structure, and sealing gaps. The best approach depends on whether you are renting or doing a major renovation.
Soundproofing When You Can Open the Wall
Stopping neighbor noise requires a combination of blocking sound transmission through the walls and masking the noise that bleeds through. The most effective non-destructive methods include sealing all air gaps, covering shared walls with sound-dampening furniture, adding thick acoustic curtains, and using high-quality white noise machines.
Walls: Adding soundproof material to walls will cost around $1 to $10 per square foot. You can also spend $40 per sheet of soundproof drywall. The total cost varies based on the size of the room and the thickness of the drywall sheets you need.
To soundproof a wall cheaply, focus on sealing gaps and adding mass. The cheapest way to reduce noise is to seal the perimeter and outlets with Acoustical Solutions, hang heavy blankets, or place a tall bookshelf full of books against the wall.
Mass-Loaded Vinyl (MLV) – Best for Blocking Sound
While it's more affordable than some high-end soundproofing materials, it remains highly effective for walls, ceilings, or floors. If you need a cost-effective way to reduce sound transmission, installing MLV is an excellent choice.
Best solutions: High-NRR foam earplugs — Foam earplugs with a Noise Reduction Rating (NRR) of 30+ dB are highly effective at blocking mid-frequency sounds.
Soundproofing on a budget relies on adding mass, sealing air gaps, and absorbing echoes. Because sound travels like air, the cheapest solutions focus on blocking those pathways. The most effective budget methods cost under $50 to $100 and can be done in an afternoon:
Yes, soundproofing walls absolutely works to block or absorb sound, provided you use the right materials and target the specific type of noise. While perfect silence is nearly impossible, properly layered wall treatments can drastically reduce noise transfer between rooms or from the outside.
Casual noise can be reduced to a tolerable level by simply "beefing up" existing walls, floors, and ceilings. However, if you want to achieve significant sound isolation, then a dedicated room construction is in order.
Sound cannot travel through a vacuum. Because sound is a mechanical wave that propagates by vibrating particles, it requires a physical medium like a solid, liquid, or gas to carry those vibrations. Since a vacuum is completely empty space lacking matter, sound waves have no particles to push against and cannot propagate.
Creating an effective sound barrier requires blocking physical noise paths through mass, air tightness, and decoupling. For the most immediate relief, seal shared walls with Acoustical Caulk, hang dense curtains, or build a solid, heavy-duty wooden fence outside. Choose solutions based on whether you need indoor or outdoor noise reduction.
While some noise in shared living spaces is normal, if you can clearly hear your neighbors' conversations or TV through your walls or ceiling, you have a noise problem.
For existing walls: Add mass-loaded vinyl to either side. If you're ready to do some renovating: Build an extra layer, forming a room within a room. You can also apply acoustic paint to reduce vibrations.
Yes, you can effectively soundproof a wall without removing the existing drywall. The most proven and industry-standard method is to add mass and decoupling to the wall by layering a specialized damping compound and a new sheet of drywall over the existing one.
Soundproofing can be a worthy investment when executed properly. Improved quality of life, more privacy, and an increase in house value are just a few of the many ways soundproofing is worth your time and money.
To soundproof a wall cheaply, focus on sealing gaps and adding mass. The cheapest way to reduce noise is to seal the perimeter and outlets with Acoustical Solutions, hang heavy blankets, or place a tall bookshelf full of books against the wall.
Yes, you can insulate existing walls without taking down your drywall using a method often called "drill and fill". This process involves drilling small access holes into the wall cavities, blowing or injecting insulation into the space, and patching the holes.
To block noise from a shared wall, you need to address two primary elements: air gaps (where sound travels through open spaces) and vibrations (where sound transfers through studs). The most effective approach combines heavy, dense materials with acoustic seals.
Sound dampening fabrics are specialized, porous textiles designed to absorb sound waves and reduce echo, rather than completely block outside noise. Depending on your needs, you can use acoustically transparent fabrics for DIY wall panels, or heavy, dense materials like velvet and wool for sound-absorbing curtains.
Excellent alternatives to drywall for ceilings include PVC panels, plywood, and wood planks. These options are much faster to install because they do not require taping, mudding, or sanding. They are lightweight, durable, and highly moisture-resistant, making them perfect for garages, basements, or bathrooms.
The best and cheapest sound absorbing materials (meant to stop echoes and improve room acoustics) include DIY acoustic panels using Rockwool, moving blankets, thick rugs, and acoustic foam panels. For the highest performance on a budget, building DIY panels out of Roxul/Rockwool remains the most effective method.
How To Soundproof Against External Sounds
Yes, devices that cancel noise absolutely exist. They use Active Noise Cancellation (ANC), which works by recording the ambient noise around you and instantly generating a reverse "anti-noise" sound wave. This neutralizes the sound before it reaches your ears.
To absorb sound in a room and reduce echo, you need to soften hard surfaces (drywall, hardwood, glass). You can achieve this quickly by introducing porous materials like acoustic panels, thick rugs, heavy curtains, and plush furniture.