Engineered and solid hardwood are both real wood, so they look and feel alike underfoot — the difference is construction. Solid hardwood is one thick piece of wood you can sand and refinish for generations, but it moves the most with humidity, so it belongs above grade over a wood subfloor. Engineered hardwood is a real-wood veneer over a cross-layered core that makes it far more dimensionally stable, so it can go over concrete, below grade, and with radiant heat — but it only refinishes as many times as its veneer allows. Choose solid for a forever floor you will refinish repeatedly above grade; choose engineered for stability, concrete or basements, radiant heat, and wide planks.
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How they are built
Solid hardwood is milled from a single piece of a species such as oak, maple, or walnut — typically 3/4 inch thick, tongue-and-groove, and nailed down over a wood subfloor. Engineered hardwood is layered: a hardwood veneer (the lamella) bonded over a plywood or fibreboard core whose grain runs in alternating directions. That cross-layering is the whole point — it cancels out much of the seasonal expansion and contraction that solid wood goes through.
Stability and where each can go
Because solid wood is 100% wood, it swells in humid seasons and shrinks in dry ones, which is why it needs careful acclimation, humidity control, and an above-grade wood subfloor. It is generally not recommended over concrete or below grade.
Engineered wood’s layered core makes it much more stable, so it tolerates humidity swings and can be installed as a floating floor, glued, or nailed — over plywood or concrete, above or below grade, and often over radiant heat. This flexibility is engineered wood’s biggest practical advantage, and the reason it dominates new installations.
Refinishing and lifespan
Solid wood’s advantage is longevity: with 3/4 inch of wood above the tongue, it can be sanded and refinished many times across decades — even generations — letting you change colour or erase years of wear. Engineered wood can be refinished too, but only within its veneer: roughly not at all under about 1 mm, once near 2 mm, and several times at 4 to 6 mm. A thin-veneer engineered floor is a “replace it,” not a “renew it,” floor — so if refinishing matters to you, check the veneer thickness, which is not the same as the board’s overall thickness.
Head to head
| Solid hardwood | Engineered hardwood | |
|---|---|---|
| Surface | Real wood | Real wood veneer |
| Stability | Moves most with humidity | Much more stable |
| Over concrete / below grade | Not recommended | Often yes, with moisture control |
| Install methods | Nail-down (wood subfloor) | Float, glue, or nail |
| Refinishing | Many times over decades | Only as the veneer allows |
| Radiant heat | Limited | Often compatible |
| Wide planks | More prone to movement | More stable in wide widths |
Which should you choose?
- Choose solid for an above-grade forever floor you plan to refinish repeatedly, in a home where humidity is controlled and the subfloor is wood.
- Choose engineered for basements and concrete slabs, radiant heat, wide-plank looks, humid or variable climates, and floating installations — anywhere stability and flexibility matter, and a thick veneer keeps refinishing on the table.
Frequently asked questions
Is engineered hardwood real wood?
Yes. Engineered hardwood has a real hardwood veneer on top, bonded over a cross-layered plywood or fibreboard core. The surface you see and walk on is genuine wood; the core is what makes it more stable than solid wood.
Which lasts longer, engineered or solid hardwood?
Solid wood generally lasts longest because it can be sanded and refinished many times over decades. Engineered wood can also last decades, but only refinishes as many times as its veneer allows — a thick veneer approaches solid-wood longevity, while a thin one cannot be refinished at all.
Can you put hardwood over concrete or in a basement?
Engineered hardwood can often go over concrete and above below-grade spaces with proper moisture control, because its layered core resists movement. Solid hardwood is not recommended below grade or directly over concrete, as it swells and shrinks too much with moisture.
Can engineered hardwood be refinished?
Sometimes. It depends on the veneer thickness: roughly none under about 1 mm, perhaps once around 2 mm, and several times at 4 to 6 mm. Always check the veneer figure, not the board's overall thickness.
Is solid or engineered hardwood more expensive?
They overlap heavily and depend more on species, grade, and quality than on type. Engineered often costs less for wide planks and adds installation flexibility, while premium thick-veneer engineered can cost as much as solid.
Does engineered hardwood add the same resale value as solid?
Both are real wood and generally appeal to buyers similarly. What matters more to value is the look, condition, and quality of the floor than whether it is solid or engineered.
Sources
This guide explains standards and terms defined by the bodies below; we are not affiliated with any of them.
- NWFA — National Wood Flooring Association: installation, moisture, acclimation, and sand-and-refinish guidance.
- NHLA / NWFA-NOFMA — hardwood grading and solid-wood mill standards.
Educational information — not professional advice. Check the manufacturer’s instructions and a qualified professional before you buy or install. Last verified: 21 July 2026. See our Disclaimer & Terms.