Are new apartments soundproof?
Are new apartments soundproof? No, they are not completely silent, but US builders must meet specific baseline minimums today.
The 2024 International Building Code (IBC) legally requires STC 50 and IIC 50 ratings between dwelling units.
We see firsthand how noise impacts daily life for our clients. A rating of 50 is just a starting point, and premium buildings often aim higher. Understanding the exact building layout makes all the difference in your comfort.
We ask for these critical noise details on lease-up buildings before you ever take a tour. This proactive step ensures you only visit properties that match your noise tolerance. Let’s break down exactly what these numbers mean and how to spot a quiet space.
What STC and IIC measure
These two metrics measure different types of sound transmission through walls and ceilings. STC tracks airborne noise, while IIC tracks physical impacts.
Our team uses these ratings to set realistic expectations for clients. An STC rating apartment metric of 50 means the wall blocks roughly 50 decibels of sound. A loud conversation hits about 60 decibels. This means roughly 10 decibels still bleed through an STC 50 wall, which sounds like a faint whisper.
| Rating | What it blocks | Applies to | 2024 IBC minimum | Premium Target |
|---|---|---|---|---|
| STC (Sound Transmission Class) | Airborne sound: voices, TV, music | Walls and floor-ceilings between units | 50 | 55-60+ |
| IIC (Impact Insulation Class) | Impact sound: footsteps, dropped items | Floor-ceilings between stacked units | 50 | 55-60+ |
Higher numbers always provide better isolation for an IIC rating floor and STC walls. Premium US developers often target STC 55 or higher to block heavy bass from home theaters.
Lab vs. field performance
Ratings are often tested on a pristine assembly in a laboratory environment. Real-world results usually drop by up to 5 points. This performance gap happens because of standard construction flaws, unsealed electrical outlets, and tiny gaps under doors.
Building type matters
The structural materials used in construction directly dictate how noise travels through a building. Wood-frame structures transmit more impact noise, while concrete structures block it much better.
We frequently tour both garden-style wood layouts and concrete high-rises across the country. Both methods can technically meet the legal 50 minimums. Here is how the main structures handle daily noise:
- Wood-frame: These buildings use layered assemblies to reach code. Builders often add resilient channels (like the RC-1 standard), Green Glue damping compound, or specialized acoustic drywall. Impact noise from heavy footsteps is still the most common complaint here.
- Concrete: Heavy concrete slabs naturally block airborne and impact sounds extremely well. Hardwood or tile placed directly on concrete can still send clicking noises downward. Premium buildings solve this by installing rubberized underlayments like Maxxon Acousti-Mat beneath the hard flooring.
Ask the leasing office for their specific STC and IIC figures. A blank stare from the staff is a major red flag for noise-sensitive renters.
What to test on a tour
Testing the unit yourself is the best way to verify actual noise levels before signing a lease. You should simulate real-world conditions while walking through the empty space.
Our clients use a few simple methods to uncover hidden sound issues. Following a clear process removes the guesswork from property tours. Preparing for your visit guarantees you test the right areas.
Here is a checklist for your next walkthrough:
- Talk test: Have someone speak in the adjacent hallway with the front door firmly closed.
- App measurement: Download the free NIOSH Sound Level Meter app on your phone. Check the ambient decibel reading in the bedroom with the HVAC running.
- Footstep test: Schedule your tour during peak evening hours. Listen closely for heavy walking if the unit above is occupied.
- Shared-wall check: Ask for the floor plan of the adjacent unit. You want to know if their kitchen cabinets share a wall with your primary bedroom headboard.
- Outside noise: Stand near windows facing highways, parking garage entrances, or the community pool. Single-pane glass will let a lot of this exterior noise inside.
- Mechanical noise: Locate the elevator shafts, trash chutes, and heavy rooftop AC units. Units sharing a wall with these will hear constant hums and vibrations.
Our tour checklist includes these specific sound checks alongside the rest of the walk-through steps. Printing this list out ensures you remember every test. Being thorough today prevents major stress next year.
Unit location tradeoffs
Where a unit sits inside the building footprint heavily influences your daily noise exposure. Top-floor corners are generally the quietest, but they often come with higher utility costs.
We help clients balance these specific compromises based on their lifestyle priorities. Reviewing the full property map reveals the best hidden gems. Making a smart choice requires weighing the pros and cons.
| Location | Quieter for | Watch for |
|---|---|---|
| Top floor | Eliminates all heavy footsteps from above | Proximity to humming roof AC equipment and higher summer heat |
| Corner unit | Fewer shared walls with loud neighbors | More exterior exposure to street traffic or wind noise |
| Away from amenities | Less screaming from the pool and courtyard | May require a much longer walk to your reserved parking spot |
| Away from elevator and trash | Zero mechanical clanking or hallway chatter | Longer daily walk carrying heavy groceries |
| Away from construction phase | Less daytime hammering and truck beeping | Ask management for the specific phase completion dates |
Picking a unit tucked at the end of a long corridor usually guarantees the lowest foot traffic. If a later phase is still going up next door, our guide on moving into a building that’s still finishing covers construction noise hours.
Use it in your comparison
Factoring sound isolation into your final decision prevents costly broken leases later. If two buildings look identical on paper, actual soundproofing quality is the ultimate tiebreaker.
We always advise clients to prioritize sleep quality over flashy amenities. This practical approach saves major headaches down the road. Comparing facts side-by-side reveals the true value of a property.
Our comprehensive guide on comparing buildings shows exactly where noise fits into a smart decision matrix. Finding out are new apartments soundproof enough for your needs requires asking the right questions. Bring your smartphone decibel meter, demand the specific STC numbers, and listen closely during your tour. Start reviewing floor plans today to identify those quiet, tucked-away corner units.
