Subfloor prep is the line item that separates a 5-year floor from a 25-year floor
Manufacturers spec subfloor flatness within 3/16 inch over 10 feet for most engineered and LVP products, tighter for tile. Real-world subfloors — especially in homes built before 2000 — are routinely 1/2 inch out over a 10-foot run. Installing over an out-of-spec subfloor causes plank movement, joint separation, hollow spots, and tile cracking. Manufacturers void warranty when they can show a substrate-flatness failure.
Self-leveling compound runs $1.50–$3.50 per sqft applied. Skipping it on a flat-looking subfloor that's actually out of spec is the most common reason people are unhappy with a brand-new floor. Ask explicitly whether your installer flatness-tested the subfloor with a 10-foot straightedge. If they didn't, they're hoping it's flat.
See also: Kitchen Remodel Cost — Kitchen remodels include flooring at standard or upscale tier within their per-sqft budget.
Moisture testing is non-negotiable on slabs and basements
Concrete slabs continue releasing moisture for years. Engineered hardwood, solid hardwood, and many laminates fail when slab moisture exceeds the manufacturer's spec (typically 3 lb per 1,000 sqft per day). LVP is the most forgiving material — most quality LVP rates to 4–5 lb. Solid hardwood is the least forgiving and has no business going on grade or below grade in any climate.
A calcium chloride or relative humidity probe test runs $50–$150 per spot. On a slab install, two or three test spots are worth doing. Skipping moisture testing is how you find out two years later that your hardwood is cupping room-wide.
LVP vs engineered hardwood vs solid hardwood — what each is actually for
Quality LVP at $4–$7/sqft installed is the right call in basements, kitchens, baths, mudrooms, and high-traffic family rooms with kids and pets. It's waterproof, dent-resistant, and refinishable in the sense that you replace damaged planks. It is not refinishable in the sand-and-restain sense — when the wear layer is gone, the floor is gone.
Engineered hardwood at $8–$14/sqft installed is the upgrade for above-grade living spaces where you want real wood feel and look. It has a real wood top layer (typically 2–4 mm) on a plywood core, can usually be refinished once or twice, and handles seasonal humidity better than solid. It is the standard hardwood-floor product nationally.
Solid hardwood at $14–$25/sqft installed is for above-grade primary spaces where you want 50+ years of refinishability and don't mind the seasonal-movement maintenance. It's overkill for most rentals, flips, and family-room upgrades. Reserve it for forever-home main floors.
Compare: Bathroom Remodel Cost — Bath floors are tile or LVP — the budget breakdown above adapts directly.
Tile and stone math is different — overage and breakage matter
Tile and stone install costs $8–$15/sqft for porcelain in standard sizes, $15–$30/sqft for natural stone, large-format porcelain, or pattern layouts. The material cost includes a 10–15% overage for cuts and breakage. Skipping the overage means waiting two weeks for a single replacement box mid-job.
Underlayment matters more for tile than for any other product. Cement backer board (Durock, HardieBacker) over plywood subfloor, or an uncoupling membrane (Schluter Ditra) directly on the subfloor, is the difference between tile that lasts 30 years and tile that cracks at the grout lines in year 4.
How regional multipliers and labor markets move the number
A 1,500 sqft engineered-hardwood install at the East South Central multiplier (0.93×) is about $14,000 base. The same install on the Pacific (1.09×) is $16,400 base, $18,800 with contingency. Tile labor moves more than wood labor regionally because there are far fewer specialty tile setters per capita in expensive markets.