Can you put engineered hardwood in a basement? Yes, as long as the concrete slab passes a few checks and the boards have something to be fastened into. The National Wood Flooring Association (NWFA) rates engineered wood for below-grade rooms and advises against solid wood there unless its manufacturer says otherwise. Every board in our engineered hardwood collection is 3/4" European oak listed as a nail-down floor, so on a basement slab the plan is a plywood subfloor over a vapour retarder, with the boards nailed (or nailed and glued) into that plywood. Below are the slab checks, the subfloor build-up, our labour rates and two 500 sq. ft. budgets you can check line by line.
Quick answer: engineered wood below grade, with conditions
- Engineered is rated for it. NWFA installation guidelines say engineered wood floors can be installed above, on and below grade, while solid wood should stay out of below-grade rooms unless its manufacturer says otherwise.
- Know what counts as below grade. NWFA defines it as any part of the subfloor sitting 3" or more below ground level.
- Our boards go over plywood on concrete. They are listed for nail-down installation, so a slab first gets a wood subfloor system laid over a Class I vapour retarder.
- Labour: $2.00 per sq. ft. for nail-down and $2.80 per sq. ft. for nail-down plus glue, and our basement rate is the same as our house rate.
- Budget: boards plus labour for a 500 sq. ft. basement came to $3,998.46 (2mm Slate, nail-down) and $4,730.18 (3mm Villa, nail-and-glue) with 13% HST, before the subfloor build-up.
Check the slab before you choose boards
The NWFA fact sheet on concrete subfloors sets out what the slab itself must look like before any wood system goes over it. Flatness comes first: within 1/8" over a 6' radius, or 3/16" over a 10' radius, with high spots ground down and low spots filled. The concrete has to be dry, and appropriate moisture tests have to be run on it. Sealers, waxes, oils, paints and drywall compound must be removed, and the slab should have no cracks, loose areas or hollow spots.
Our guide to moisture testing concrete subfloors walks through how those tests are done in a basement. Keep one NWFA caution in mind: a moisture test describes the slab at the time it was performed, not a permanent condition.
Readings that call for a vapour retarder
NWFA ties its vapour retarder advice to three test types. A Class I impermeable vapour retarder goes over the slab when a calcium chloride test reads more than 3 pounds, a relative humidity test reads more than 80%, or a calcium carbide test reads more than 2.5%. For on-grade and below-grade slabs it goes further and recommends the Class I retarder whatever the readings, because moisture in a slab varies and the barrier under the concrete can degrade over time.
The concrete fact sheet does not set a single pass mark for your floor. It tells installers to follow the flooring and adhesive manufacturers for moisture testing and limits, so the acceptable reading depends on the products going down. Confirm it at the site visit, before any boxes are ordered.
Building the plywood subfloor over concrete
NWFA describes several ways to put a wood subfloor over concrete: a double layer floated over the slab, a single layer glued down, and a single layer mechanically anchored. The figures below come from its single-layer methods.
- Vapour retarder first. A Class I impermeable retarder covers the slab. Where anchors are driven through it, NWFA calls for the retarder maker's sealing mastic at each penetration.
- Panels. Plywood or OSB at least 23/32" thick. For the anchored method NWFA lists 23/32 (18.3mm) panels in full 4'x8' sheets or cut into 2'x8' or 4'x4' sections; for the glued-down method the panels are cut into 2'x8' or 4'x4' pieces.
- Spacing. Joints are staggered with 1/8" between panels, and at least 3/4" of expansion space is left at walls and other vertical obstructions.
- Holding the panels down. Either an adhesive compatible with the retarder (the glue-down method) or fasteners made for concrete, such as powder-driven pins or screws, set to the fastener maker's schedule.
- Nail length for the boards. When the flooring is nailed down, the installer picks a fastener length that does not go through the subfloor and pierce the retarder underneath.
None of this build-up is inside our per-square-foot labour rate. Our engineered hardwood installation service covers base installation only, and subfloor prep, trim, transitions, stairs and removal of the old floor are quoted separately. The plywood, retarder and anchoring for a basement are therefore priced after viewing the slab.
Our 3/4" engineered boards for a basement subfloor
With a plywood subfloor in place, choosing between our boards comes down to look, plank width and wear layer, since all of them share the same thickness and nail-down listing. These five are in stock now, priced per square foot as box price divided by box coverage.
| Boards | Width | Wear layer | Full-length planks | Box price / coverage | Per sq. ft. |
|---|---|---|---|---|---|
| Slate, Berkley, Silver Beige | 6.5" | 2mm | 60% | $95.71 / 20.24 sq. ft. | $4.73 |
| Villa, Verita | 7.5" | 3mm | 70% | $97.00 / 19.42 sq. ft. | $4.99 |
Prices checked October 6, 2026. Box prices and coverage come from our current catalogue.
The 3mm boards cost $0.26 more per sq. ft. than the 2mm boards, and that buys a wider 7.5" plank with a higher share of full-length pieces. If you are weighing how much wear layer a basement family room needs, our engineered hardwood wear layer comparison sets out the trade-offs. The Villa product page lists basements among the rooms it suits, next to main floors and condos.
Nail-down or nail-and-glue: what the labour costs
We quote two methods for these boards. Both are charged on the waste-adjusted area, which is your measured floor area plus 5%.
| Method | House or basement | Condo |
|---|---|---|
| Nail-down | $2.00 per sq. ft. | Priced after viewing |
| Nail-down plus glue | $2.80 per sq. ft. | Priced after viewing |
Adding glue costs $0.80 per sq. ft. more. Our installation listing describes the glue step as enhanced adhesion for added stability and sound reduction, and pairs it with 7.5" planks, which is why the second budget below uses Villa. For a broader look at how nailed floors differ from floating ones, read our nail-down versus floating comparison. Condo jobs have no standard rate for either method, and our condo installation guide covers what changes in a building.
Two 500 sq. ft. basement budgets for boards and labour
Both examples assume a 500 sq. ft. basement in a house, which becomes 525 sq. ft. after the 5% waste allowance. Boxes are rounded up to whole boxes, labour is charged on the 525 sq. ft., and HST is 13% of the subtotal. The plywood subfloor, vapour retarder, delivery and any removal are left out of these tables and confirmed at quote, so read them as the floor-and-labour part of the job.
Slate, 2mm, nail-down
| Line | Basis | Amount |
|---|---|---|
| Material | 525 ÷ 20.24 = 25.94, so 26 boxes × $95.71 | $2,488.46 |
| Labour (nail-down) | 525 sq. ft. × $2.00 | $1,050.00 |
| Subtotal | $3,538.46 | |
| HST 13% | $460.00 | |
| Total | $3,998.46 |
Spread over the 500 sq. ft. of floor, that is $7.08 per sq. ft. before HST and $8.00 per sq. ft. after it.
Villa, 3mm, nail-and-glue
| Line | Basis | Amount |
|---|---|---|
| Material | 525 ÷ 19.42 = 27.03, so 28 boxes × $97.00 | $2,716.00 |
| Labour (nail-down plus glue) | 525 sq. ft. × $2.80 | $1,470.00 |
| Subtotal | $4,186.00 | |
| HST 13% | $544.18 | |
| Total | $4,730.18 |
Here the floor works out to $8.37 per sq. ft. before HST and $9.46 per sq. ft. with it. The gap between the two budgets is $731.72 including tax. Of the pre-tax difference, $420.00 is the glue step and $227.54 is the board, partly because 525 sq. ft. needs 28 of the smaller 19.42 sq. ft. boxes instead of 26 of the larger ones.
What the per-square-foot rate leaves out
- Subfloor build-up. Plywood or OSB panels, the Class I retarder, sealing mastic, and anchors or adhesive.
- Slab correction. Grinding high spots and filling low ones to bring the slab within the NWFA flatness tolerance.
- Removing the old floor. What comes out, and how it was fastened, changes the work involved.
- Trim, transitions and stairs. These sit outside the base installation and are added as separate lines.
- Delivery. Set by your postal code and confirmed with the quote.
When engineered hardwood is the wrong fit below grade
Engineered wood is permitted below grade, but that does not make it right for every basement. Look at a different floor if:
- The slab is damp, has taken on water, or keeps failing moisture tests. NWFA's conditions for wood over concrete include a dry, sound and clean slab.
- Headroom or door clearance is tight. A 23/32" panel plus a 3/4" board adds about 1.47 inches to the floor height before the retarder is counted.
- You want a floor laid straight onto the concrete with no wood subfloor. Our engineered boards are listed for nail-down only, so they do not fit that plan.
In those cases vinyl plank is the option to look at. Our complete basement flooring guide compares vinyl thicknesses and concrete subfloor options for Toronto basements.
Frequently asked questions about engineered hardwood below grade
Can engineered hardwood be floated on a basement concrete floor?
Not with the boards we carry now. Each engineered board in our range names nail-down as its installation method, so on a slab they are fastened into plywood that sits on a vapour retarder rather than floated on the concrete.
Do I need a vapour barrier under engineered hardwood on concrete?
Below grade, yes. NWFA recommends a Class I impermeable vapour retarder on on-grade and below-grade slabs even when the test readings are low, and in a nail-down system it sits on the concrete, under the plywood.
Does a basement install cost more than an upstairs one?
Not on the labour line. Our basement rates equal our house rates, $2.00 for nail-down and $2.80 for nail-and-glue per sq. ft. The extra basement cost is the subfloor build-up and any slab correction, which are priced after viewing.
Is a 3/4" board too thick for a basement?
Thickness mainly matters for height. Measure the gap under doors, the rise of the bottom step and any doorway transitions before you order, because the plywood and boards together raise the finished floor.
How flat does the slab have to be?
NWFA's tolerance is 1/8" in a 6' radius, or 3/16" in a 10' radius. A slab outside that is ground and filled before the plywood goes down, and that work is quoted once we have seen it.
Get a basement engineered hardwood quote in Toronto and the GTA
Send us the size of the basement, what is on the slab now and any moisture readings you already have, and we will price the boards, labour and subfloor work together. You can request a quote online.
Top Floorings Depot
3781 Victoria Park Avenue, Unit 1, Toronto, ON M1W 3K5
www.topfloorings.com
Call: 416-499-0117
Text: 416-770-8819