These two are rarely the right pair to compare, because they are sold into different buildings. Polyester broadloom over a pad is a residential carpet, soft, cheap and right for a bedroom. Carpet tile is the commercial carpet, and this site does not put it forward for a house — including the basement, where the honest answer is a hard floor with nothing organic in it.
Installed cost includes material and professional labor. Ratings are relative across all 21 materials on this site, not absolute scores.
| Polyester / PET Carpet | Carpet Tile (Modular) | |
|---|---|---|
| Installed cost per sq ft | $3.00–$7.50 | $3.00–$9.50 |
| Expected service life | 5–12 years | 10–20 years |
| Cost per sq ft per year | $0.62 | $0.42 |
| Durability | 3/5 | 4/5 |
| Water resistance | 3/5 | 3/5 |
| Comfort underfoot | 5/5 | 4/5 |
| Sound absorption | 5/5 | 4/5 |
| Ease of maintenance | 4/5 | 5/5 |
| DIY friendliness | 2/5 | 5/5 |
| Environmental profile | 4/5 | 4/5 |
| Traffic rating | Moderate | Extreme |
| Commercially rated | No | Yes |
The points that decide this in practice — not the spec sheet items that read well but rarely change anyone's mind.
Polyester broadloom is made for houses: soft, stain-resistant and cheap, stretched over a pad. Carpet tile is made for offices, schools and healthcare: hard-backed, dense, low, and laid on a releasable adhesive so a damaged square lifts out. The tile is the better-engineered product and the wrong one for a living room, because everything it is engineered for is a commercial problem.
Polyester over a good pad is soft and warm. Carpet tile installs directly to the slab with an integrated backing, so it feels firm — a reasonable trade under a desk chair, and not what anyone wants under bare feet in a bedroom.
Polyester lacks resilience and mats down in traffic lanes, which is why it belongs in bedrooms and not hallways. Commercial carpet tile is usually solution-dyed nylon in a low, dense construction built for corridors. In a house the equivalent is a dense nylon or triexta broadloom, not a tile.
Both get asked about basements, and neither is the answer. Polyester over a pad traps moisture against the slab where you cannot reach it; carpet tile was the old workaround and it is a commercial product. Below grade, a floor with nothing organic in it — rigid vinyl plank, porcelain — is what survives a slab and a leak, and the basement guide ranks them.
$3.00–$7.50 per sq ft installed, lasting 5–12 years — about $0.62 per sq ft per year.
PET is the right answer for bedrooms and the wrong answer for stairs. Mixing fibers by room is a legitimate, cost-effective strategy.
$3.00–$9.50 per sq ft installed, lasting 10–20 years — about $0.42 per sq ft per year.
A commercial product: order 5% attic stock at bid so a tile damaged years later still matches. For a house, broadloom over pad is the carpet this site recommends.
It was the traditional workaround, because wet tiles lift out to dry. This site no longer puts it forward for a basement or any other room in a house: it is a commercial product with a commercial look. A basement wants a floor with nothing organic in it — rigid core vinyl plank or porcelain — and if the room has to feel soft, WPC plank with an attached pad and washable rugs over it.
You can, and it is a poor bet. The fiber itself resists moisture reasonably well as a synthetic, but the pad and the seams do not, and a saturated broadloom installation usually means full replacement. If the basement has ever taken water, a hard floor is the sounder choice.
Broadloom polyester is usually cheaper per square foot on material. Carpet tile narrows the gap in a large irregular plan where roll goods waste heavily, and it avoids the labor of stretching. In a house the comparison does not arise, because the tile is not the right product there whatever it costs.
Nylon recovers from crushing and lasts longer in traffic; polyester resists stains inherently and is softer and cheaper.…
Carpet tile is the commercial carpet — offices, schools and healthcare standardized on it because one damaged square is…