In a house you choose a floor for yourself. In a condo the neighbor below has a say, the association has a rule, and the building has a concrete or wood-framed floor that decides what is possible. The ranking here is by sound first, and the notes explain how a hard floor that ranks low can still be the right choice with the correct underlayment.
Most associations have one, and it is written in a number: an IIC rating, the Impact Insulation Class of the whole floor assembly, measured under ASTM E492 and E989. Building codes require a minimum of IIC 50 between units; many condo rules require 55 or more, and some require carpet in bedrooms and hallways outright. The rating belongs to the assembly — slab, underlayment, floor — so the same plank passes on one product and fails on another.
Carpet passes on its own, which is why it tops the ranking. Every hard floor gets there with an acoustic underlayment rated for the target, and that underlayment is the real purchase: its test report, for the same kind of slab the building has, is what the association approves.
Source: ASTM E989, Standard Classification for Determination of Impact Insulation Class.
The sound rating counts double and comfort in full, with durability and water resistance as tie-breakers; every hard floor’s real score depends on the underlayment under it. Carpet is held to two of the four picks, because its fibers are one decision inside a single choice; the full table below has them all.
$4.00–$9.50 per sq ft installed
Carpet over pad is the one floor that passes a condo sound rule with nothing added, and triexta is the residential fiber that stains least and wears well enough for a hallway. The default answer for the rooms the association wants soft.
$8.00–$22.00 per sq ft installed
The quietest, most comfortable floor on the page, and the one that costs and asks the most. In a condo bedroom where the floor is walked on in socks it earns its price.
$5.00–$13.00 per sq ft installed
The quietest hard floor: the foam-composite core and attached pad damp footfall in a way stone core and tile do not, and over a good acoustic underlayment it reaches the IIC numbers most associations want. Waterproof, warm, and the usual answer for a condo that is going hard-surface throughout.
$3.00–$9.00 per sq ft installed
Thin and fully bonded, so there is no floating layer to drum underfoot, and quieter on a slab than rigid plank for that reason. Over an acoustic underlayment, or in a cushion-backed grade, it passes most rules, and it is the wet-room answer in many buildings.
Same rule as the picks, run over everything that qualifies. Ties go to the cheaper material.
| Material | Impact sound | Comfort | Durability | Water | Installed / sq ft |
|---|---|---|---|---|---|
| 1Triexta (PTT) Carpet | $4.00–$9.50 | ||||
| 2Wool Carpet | $8.00–$22.00 | ||||
| 3Polyester / PET Carpet | $3.00–$7.50 | ||||
| 4Nylon Carpet | $4.00–$10.00 | ||||
| 5Luxury Vinyl Plank — WPC (Wood-Plastic Core) | $5.00–$13.00 | ||||
| 6Olefin (Polypropylene) Carpet | $2.50–$6.50 | ||||
| 7Sheet Vinyl | $3.00–$9.00 | ||||
| 8Luxury Vinyl Plank — SPC (Rigid Core) | $4.00–$11.00 | ||||
| 9Luxury Vinyl Tile (LVT) | $5.50–$13.00 | ||||
| 10Engineered Hardwood | $9.00–$19.00 | ||||
| 11Luxury Vinyl Plank — Flexible (Glue-Down) | $3.50–$9.00 | ||||
| 12Laminate | $3.50–$11.00 | ||||
| 13Solid Hardwood | $9.00–$22.00 | ||||
| 14Epoxy & Resinous Coatings | $3.50–$18.00 | ||||
| 15Porcelain Tile | $8.00–$29.00 | ||||
| 16Ceramic Tile | $6.00–$18.00 | ||||
| 17Natural Stone | $11.00–$50.00 |
The association approves an assembly with a test report, not a material. A floor bought and installed before the approval is a floor removed at the owner’s cost, and it happens every year in most buildings.
The hardest floors transmit the most impact noise and need the most underlayment. A 1 mm foam pad sold as "acoustic" does almost nothing; a purpose-made rubber or cork underlayment with a tested IIC on a slab like yours does. The report matters more than the thickness.
Underlayment makers test on a bare six-inch slab with no ceiling, which gives a flattering number that no real building reproduces. Ask for the Delta IIC, which is the improvement the product adds, or a test on an assembly like the building’s. Associations that know their business ask for the same.
It cannot be, and the glue-down engineered version with an acoustic underlayment is what a condo actually gets. If the building is wood-framed and allows nailed floors, the nails bypass the underlayment and so does the sound.
Many associations require a waterproof floor and a sealed perimeter in wet rooms, because a leak in a condo is the neighbor’s ceiling. Tile or vinyl in bathrooms is usually mandatory, and the sound rule is relaxed there.
Impact Insulation Class is a lab rating (ASTM E492 and E989) of how much footfall noise a floor assembly stops. Building code requires IIC 50 between dwelling units, 45 when field-tested; condo associations commonly require 55 or 60 and some name a higher figure for hard floors specifically. The rating belongs to the whole assembly — slab, underlayment and floor — so a product’s number on its own is not the building’s.
Engineered hardwood, glued or floated over an acoustic underlayment that gets the assembly to the association’s IIC, is the normal way. Solid hardwood cannot be nailed to a concrete slab and is usually excluded by the rule or the building. Check the rule first, then buy the underlayment with the test report, then the floor.
Almost always, with an approved underlayment. WPC plank is the quieter choice and often carries an attached pad that counts toward the rating; SPC is harder and needs more under it. Products marketed as condo or acoustic plank are usually an ordinary plank with a thicker pad, and the test report is what to ask for.
Carpet over a thick pad, by a wide margin. Among hard floors, cork, then WPC vinyl plank over a rubber acoustic underlayment, then engineered wood over the same. Tile and SPC are the loudest and need the most help.
If the governing documents say so, yes, and most do for any floor covering change. The application typically asks for the product, the underlayment, and a test report for the assembly. Installing without approval leaves the owner liable to remove it, and a downstairs neighbor’s complaint is how that usually starts.
One with a laboratory test on an assembly like the building’s — a 6-inch or 8-inch concrete slab for most mid-rise and high-rise condos, a wood-joist floor for most low-rise ones — showing the IIC the association wants. Rubber and rubber-cork products in the 3 to 6 mm range are the usual answer for hard floors; the report matters more than the material.
Each of these ranks every material against one problem, the same way this page does.
Also relevant: Best flooring for a bedroom · Engineered hardwood · Nylon carpet