A 20x20 room (400 sq ft) costs $1,400-$3,600 to carpet installed in 2026. See pricing tiers and a free instant calculator.
Frequently Asked Questions
How much does it cost to carpet a 20x20 room?
A 20x20 room (400 sq ft) costs $1,400-$3,600 installed in 2026 with carpet, pad and labor. Standard mid-range is typically $2,000-$2,800.
How many yards of carpet for a 20x20 room?
400 sq ft + 10% waste = 440 sq ft, or about 49 sq yards. Most carpet rolls are 12-15 ft wide — a 20x20 room usually needs one seam.
How long to install carpet in a 20x20 room?
A pro crew takes 4-6 hours for a 20x20 room install including pad and seaming.
Is a 20x20 room considered a large room?
Yes — 400 sq ft is roughly the size of a 2-car garage or a large basement family room. Most homes have at most one 20x20 carpeted room.
Will a 20x20 room need carpet seams?
Yes. Standard 12 ft carpet rolls require one seam at the 12-15 ft mark. A skilled installer hides seams under furniture or in low-traffic zones.
What's the cheapest way to carpet a 20x20 room?
Buy builder-grade polyester ($3.50/sq ft installed) during Lowe's $99 whole-home install promos — total ~$1,500 vs $2,800+ at standard pricing.