Solid vs Engineered Hardwood
Solid hardwood: One solid piece of wood (typically 3/4 inch thick). Can be sanded and refinished 6-10+ times. Lasts 50-100+ years. Must be nailed or stapled to a wood subfloor. NOT suitable for: basements, over concrete, or radiant heat (usually). Expands and contracts with humidity. Best for: above-grade living areas in stable climates. Cost: $6-$18/sq ft (material). $10-$25/sq ft (installed).
Engineered hardwood: Real wood veneer (1-6mm) on plywood or HDF core. Can be sanded and refinished 1-3 times (thicker veneer = more refinishes). More dimensionally stable (less expansion/contraction). Can be installed over concrete, in basements, and with radiant heat. Multiple installation methods: floating, glue-down, nail-down. Best for: any room, any level, especially where moisture or temperature varies. Cost: $4-$16/sq ft (material). $8-$22/sq ft (installed).
Popular Species
Oak (red and white): The most popular hardwood flooring species. Red oak: warm tones, prominent grain. White oak: cooler tones, tighter grain, more water-resistant. Hardness (Janka): red oak 1,290. White oak 1,360. Cost: $4-$10/sq ft.
Maple: Light, clean, uniform appearance. Very hard (Janka 1,450). Great for contemporary and modern styles. Cost: $5-$10/sq ft.
Hickory: Dramatic grain and color variation. Extremely hard (Janka 1,820). Rustic, character-rich appearance. Cost: $5-$10/sq ft.
Walnut: Rich, dark brown color. Softer (Janka 1,010). Elegant, warm appearance. Cost: $8-$14/sq ft.
Cherry: Warm reddish-brown that darkens over time. Softer (Janka 950). Formal, traditional look. Cost: $6-$12/sq ft.
Exotic species: Brazilian cherry (Janka 2,350): extremely hard, rich red-brown. Bamboo (Janka 1,000-3,000 depending on type): sustainable, unique look. Acacia (Janka 2,300): dramatic grain, very hard. Cost: $5-$15/sq ft.
Cost
Material only (per sq ft): Solid hardwood: $4-$15 (domestic). $6-$18 (exotic). Engineered hardwood: $3-$12 (domestic). $5-$16 (exotic).
Installation (per sq ft): Nail-down: $3-$6. Glue-down: $3-$6. Floating: $2-$4.
Total installed: Budget (oak, builder grade): $8-$12/sq ft. Mid-range (select grade oak or maple): $12-$18/sq ft. Premium (wide plank, exotic, or custom): $18-$30+/sq ft.
Refinishing existing hardwood: Sand and refinish: $3-$5/sq ft. Screen and recoat (light refresh): $1-$3/sq ft.
For a typical project (1,000 sq ft): Budget: $8,000-$12,000. Mid-range: $12,000-$18,000. Premium: $18,000-$30,000+.