Both are real wood. Both can look identical once they are down. The difference is what is underneath the top layer, and that decides where each one can go in your house. In St. Louis, where a lot of homes have a basement, an old plank subfloor or a slab somewhere, picking the right construction matters more than picking the right color.
How Each One Is Built
Solid hardwood is a single board, usually three-quarters of an inch thick, with a tongue and groove milled into it. It gets nailed to a wood subfloor. Because it is solid all the way through, it can be sanded and refinished many times over its life, which is why so much original oak in older St. Louis neighborhoods is still worth saving.
Engineered hardwood bonds a real wood wear layer to a core of plywood or another stable material, with the layers running in different directions. That cross-layering is what makes it resist the swelling and shrinking that solid boards go through between August and February. How many times it can be refinished depends on how thick the wear layer is, so that is the spec to ask about.
Where Each One Works
| Situation | Solid | Engineered |
|---|---|---|
| Main or upper floor over a wood subfloor | Yes | Yes |
| Matching or patching original oak | Usually the right choice | Rarely a good match |
| Basement or below grade | Not recommended | Possible with the right product and moisture readings |
| Over a concrete slab | Not without a wood subfloor | Yes, glued or floated depending on product |
| Rooms with big humidity swings | Moves more | Moves less |
The St. Louis Factors
Three things come up on almost every hardwood estimate here. First, humidity: summers are muggy and winters are dry, and wood moves with that, so acclimation and a proper expansion gap matter on either product. Our post on Missouri humidity and hardwood floors goes deeper on gaps and cupping. Second, basements: for most lower levels, rigid core LVP is still the safer floor, as we covered in the best flooring for St. Louis basements. Third, old houses: if you are tying into original two and a quarter inch red oak, solid is almost always how you get a match that disappears after sanding.
What It Costs
The price difference between the two is smaller than most people expect. Species, width, grade and finish move the number more than solid versus engineered does. Where they differ is installation: solid needs a sound wood subfloor to nail into, while engineered can open up options over concrete. Our 2026 St. Louis cost guide lays out the ranges.
Not sure which one your rooms can take? We will check the subfloor and moisture and tell you straight.
Get a free in-home estimateCome Look at Both
The difference is easier to understand with a board in each hand. Stop by the showroom in Maryland Heights, or have us bring samples to the house and measure while we are there.
