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The cost to install new subfloor and floorboards in a new construction ranges from $7,500 to $36,750 to cover 1,500 square feet. On average, subfloor costs $2 to $2.50 per square foot. Floorboards run from $3 to $22 per square foot for materials and installation.

If you don't want to replace your floor until absolutely necessary, look for the following signs that you might need a new floor:

• Uneven floors

• Sunken floorboards

• Worn patches

• Stains you cannot get rid of

• Excessive scratches and scuffs

• Bare spots

• Sagging, buckling, or bubbling

How long it takes to install flooring depends on the type of flooring. Installing laminate wood flooring in a single, simple-shaped 200 square foot room should only take around three hours, assuming you've already given the laminate at least three days to acclimate to the room. 

Carpet is usually pretty quick to install, even with the addition of new underlayment. On the other hand, stone and ceramic tiles can take a full day or more to install because tiling installation is a more time-consuming process.

The cost to refinish wood floors is about $3 to $8 per square foot, and may vary based on project type.

If you need grading and repair work to the subfloor, expect to pay a flooring contractor $60 to $120 per hour for this portion of the remodel. Repairing a floor costs $40 to $60 per square foot, on average. While renovating, if you want to add underfloor heating, expect to pay between $6 and $20 per square foot for the cost of a radiant heat system.