Engineered vs Solid Hardwood: How to Choose for Your Home
Solid hardwood is the better choice for main-level rooms where you want a floor you can sand and refinish many times. Engineered hardwood is the better choice where humidity swings, concrete slabs or basements are involved. Both are real wood, and both can look identical once installed. The right pick depends on the room, the subfloor and how many decades you want the floor to last.
We restore hardwood floors across the St. Louis metro area and central Illinois, so we see both types after 5, 15 and 30 years of real use. This guide covers what we see, with sources for the technical claims.
TL;DR
Solid hardwood is one piece of wood top to bottom. Engineered has a real-wood top layer bonded over plywood or a similar core.
Engineered is more dimensionally stable and can go on, above or below grade. Solid wood should generally go on or above grade only.
Solid wood can be sanded and refinished many times. For engineered, the thickness of the top wear layer decides how many times, and sometimes the answer is none.
Neither is waterproof, and neither belongs in a bathroom.
Before you replace either one, have it assessed. Many tired floors only need a refresh.
Table of Contents
What actually separates the two
The National Wood Flooring Association (NWFA) describes solid wood as one piece of wood from top to bottom, usable in any room on or above ground. Engineered flooring has a wood veneer, often called a lamella or wear layer, bonded over several layers of plywood or another core. Those layers are often laid in a crisscross pattern to improve dimensional stability.
The surface is the same species of wood either way. Stand on an oak floor and you usually can’t tell which one you have without looking at a cut edge, a floor vent opening or the underside of a transition strip.
Thickness is where people get confused. The Spruce notes that solid wood is typically 3/4 inch thick, while engineered ranges from 3/8 inch to 3/4 inch. A thick engineered plank is not automatically a long-lived one. What matters for the future of the floor is the wear layer on top, not the overall plank.
Side-by-side comparison
Factor | Solid hardwood | Engineered hardwood |
Construction | Single piece of wood | Wood veneer over plywood or core layers |
Typical thickness | 3/4 inch | 3/8 inch to 3/4 inch |
Stability with humidity | Expands and contracts more | Noticeably more stable |
Where it can be installed | On or above grade | Above, on or below grade, per manufacturer specs |
Refinishing | Many times | Depends on wear layer thickness |
Typical installed cost | $11 to $25 per sq. ft. | $9 to $20 per sq. ft. |
Wide planks | Possible, but more prone to movement | Easier to do well |
The cost range comes from HomeGuide’s 2026 cost comparison. Local quotes vary with species, plank width, subfloor prep and whether the floor is prefinished, so treat those numbers as a planning range, not a bid.
Stability: why engineered wins on moisture and movement
Wood takes on and gives off moisture as the air changes. Solid boards move across their width as they do. In a climate like ours, with humid summers and dry, heated winters, that movement shows up as seasonal gaps between boards or, in a wet year, cupping.
Engineered construction fights this. According to NWFA’s installation guidelines, solid wood should generally be installed on or above grade, while engineered wood can be installed above, on or below grade depending on manufacturer specifications. That is why engineered is the usual answer for a finished basement or a room over a concrete slab.
This Old House makes the same point from the installer’s side: the layered build resists cupping and keeps boards straighter, which helps avoid the gapping that solid floors can show after big seasonal swings.
Stable does not mean waterproof
This is the most common misunderstanding we hear. Engineered hardwood is more water resistant than solid, not waterproof. A guide on high-moisture flooring choices points out that even stable engineered wood can delaminate or buckle with standing water or high moisture. A burst dishwasher line or a slow leak under a sink will damage either type. Keep both out of bathrooms.
Refinishing: the deciding factor for long-term value
This is where our work comes in, and it is the part most comparison pages skim.
Solid hardwood is wood all the way through. NWFA’s guidelines state that solid floors can be sanded and refinished numerous times over their service life. A 100-year-old oak floor in Belleville or Clayton is proof.
Engineered floors can be refinished too, but only to the extent the wear layer allows. The Spruce guidance notes that floors with a wear layer under 2.5 mm should generally be recoated rather than deep-sanded. Our own guidance on sanding engineered hardwood under a 2 mm wear layer is similarly cautious. Exact limits vary by manufacturer, so the safe move is to have someone measure before any sander touches the floor.
Check the wear layer, not the plank
Consumer-facing advice often confuses overall thickness with wear layer. A 5/8 inch plank can have a very thin veneer. If you are buying engineered flooring, ask for the wear layer thickness in writing. If you already own it, a pro can often measure it from a board edge at a vent or threshold.
What thin wear layers mean in practice
Thick wear layer: may allow a full sand and refinish, including a color change.
Thin wear layer: usually limited to a screen and recoat, which abrades the finish and adds a fresh coat without removing meaningful wood.
Worn finish, sound wood: a clean and buff can bring back the sheen.
If you want the details, see our overview of engineered hardwood restoration and our step-by-step refinishing walkthrough.
Which one fits which room
NWFA’s homeowner guidance frames the decision around the installation site’s environment. Solid wood suits living and bedroom areas as a long-term investment; engineered is the practical preference where moisture or temperature swings occur. Here is how that plays out in homes we visit:
Main-level living room, dining room, hallway: solid or engineered both work. Solid gives you the most refinishing runway.
Bedrooms: same as above. Choose on budget and plank width.
Finished basement: engineered, installed per the manufacturer’s below-grade specs.
Over a concrete slab (common in additions and some newer builds): engineered.
Kitchen: either can work with careful spill habits and a good finish, but this is where we see the most water damage.
Bathroom: neither.
Over radiant heat: check the manufacturer. Engineered is often the one approved, and NWFA notes it can suit certain radiant systems.
If your layout has wide, open sightlines and you want wide planks, engineered is usually easier to do well because the layered core resists the movement that makes wide solid boards gap or cup.
Installation conditions that make or break either floor
Most premature failures we are called out for trace back to the environment around the floor, not the product.
NWFA’s guidelines call for the building to be fully enclosed and climate-controlled before wood goes in. The guidance we pull from says the HVAC should hold roughly 30 to 50% relative humidity for several days before delivery, and the subfloor should be dry. Do not use propane heaters to warm a space during installation: burning propane adds moisture to the air, which can make boards swell before they are even nailed down and lead to gaps or buckling later.
For finishing work, we ask homeowners to measure temperature and humidity first. Our guide on temperature and humidity before finishing explains what to check and why. If a solid floor has already cupped, wait before sanding and let the moisture settle.
If you want a general overview of single-piece versus engineered flooring from another angle, this flooring comparison for homes is written for a UK audience, so product names and building practice differ from ours, but the construction basics carry over.
What each costs over the life of the floor
Sticker price is only part of the picture. Using the HomeGuide ranges above, solid hardwood typically costs more upfront, and engineered often installs faster, which can trim labor.
Over 30 years, though, the math can flip:
Solid: higher purchase price, but several refinishes can carry it for generations. Each refinish costs far less than new flooring.
Engineered with a thick wear layer: a mid-life refinish is possible, which gives you most of the benefit at a lower entry price.
Engineered with a thin wear layer: you can maintain it with recoats, but when the veneer is worn through, replacement is the only fix.
That is why we say the true cost question is “how many more times can I renew this floor?” Our refinishing frequency guidelines help you plan, and why hardwood outlasts other flooring types covers the longevity side.
Our perspective
We have restored floors in St. Louis, Columbia, Belleville, Fairview Heights, Waterloo, O’Fallon and many other communities since 2003. After that many floors, our view is plain.
First, the engineered-versus-solid debate matters most at purchase time. Once the floor is down, the more useful question is what condition it is in and what the least invasive fix is. Many homeowners who call us thinking they must replace their flooring need a clean and buff, a screen and recoat or wax removal, not a new floor. Our line is “Before you REFLOOR it, let us RESTORE it.”
Second, we don’t treat engineered flooring as a lesser product. A well-made engineered floor with a decent wear layer, installed in the right conditions, is a smart choice, and we refinish them. We just won’t sand one past what it can take, because you can’t put wood back.
Third, we use dustless techniques and eco-friendly products, and most restoration jobs finish in a single day, with floors ready to walk on in about three hours. That changes the calculation for people who assumed refinishing meant a week of dust and fumes.
— Kim
Already have a floor? Get it assessed before you replace it
If you own solid or engineered hardwood in the St. Louis metro or Metro East, book an in-home consultation. We will look at the floor, tell you what type it is, check what is realistic for the finish and wood that is there, and recommend the lightest option that works. Depending on the floor, that could be a full sand, stain and refinish, a recoat, a buff or wax removal.
A practical way to decide
Check the subfloor. Basement or slab? Go engineered.
Decide how long you will stay. Staying 20 years or more favors solid on upper floors, or engineered with a thick wear layer.
Ask for the wear layer number. Get it in writing for any engineered product.
Plan for humidity control. Hold your home’s relative humidity steady, and don’t install until the house is enclosed and conditioned.
Budget for a refinish. Use our project checklist when the time comes, and read about finish types so the new coat suits your lifestyle.
FAQ
Is engineered hardwood more stable than solid hardwood?
Yes. Its cross-layered core reduces expansion and contraction as humidity and temperature change. That is why manufacturers specify it for below-grade and slab installations where solid wood is not recommended. It is still wood, and still needs a dry subfloor and stable indoor humidity.
Can engineered hardwood be refinished?
Sometimes. It depends on the wear layer. Guidance generally treats a layer under about 2.5 mm as recoat-only, and some manufacturers set their own limits. Have the layer measured before any sanding is planned.
Is engineered hardwood waterproof?
No. It resists moisture better than solid wood but can still delaminate or buckle with standing water. Wipe up spills quickly and fix leaks right away. Don’t use either type in a bathroom.
Which costs more, solid or engineered?
Solid usually costs more installed: HomeGuide’s 2026 figures are $11 to $25 per square foot for solid and $9 to $20 for engineered. Your actual price depends on species, width, finish and subfloor work.
Can I put solid hardwood in a basement?
Generally not. NWFA guidance says solid wood goes on or above grade. For a basement, use an engineered product approved for below-grade installation and follow its instructions exactly.
Sources
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