What is the cost per square foot to have a contractor install polished concrete flooring in a finished basement in Moncton in 2026?

Polished concrete is generally not recommended for finished basement living spaces in New Brunswick, and most NB basement contractors won't install it below grade — here's why, and what the costs look like if you're still considering it.

Polished concrete involves mechanically grinding, honing, and buffing an existing concrete slab to a smooth, reflective finish, sometimes with densifiers and sealers applied. In a commercial or above-grade setting, it's a durable, attractive option. In a Moncton basement, it creates serious problems that most experienced contractors will flag immediately.

The core problem is moisture. Moncton's sandy and silty soils allow concrete slabs to wick ground moisture constantly, and NB's summer humidity averages 70–85%. A polished and sealed concrete floor traps that moisture vapour beneath the surface — it has nowhere to go. Over time, this causes the sealer to delaminate, the surface to cloud and pit, and efflorescence (white mineral salt deposits) to push through. You can spend $8–$15/sq ft on a polished concrete floor and watch it deteriorate within two to three seasons. The finish also becomes slippery when condensation forms on the cold surface in summer — a real safety concern in a living space.

If you've had the slab professionally moisture-tested and it passes, and you're committed to polished concrete, expect to pay roughly $8–$15/sq ft installed in the Moncton market for a standard grind-and-seal finish. A full multi-step polish with densifier, aggregate exposure, and high-gloss finish runs $12–$20/sq ft. These prices reflect NB labour rates, which run about 15–20% below Ontario pricing. That said, fewer contractors in Moncton specialize in decorative concrete finishing compared to larger urban markets — getting three qualified quotes may take some effort, and pricing will vary significantly.

What most NB basement contractors actually recommend instead is LVP (luxury vinyl plank) over a Dricore subfloor system. LVP runs $4–$8/sq ft installed, handles NB's humidity swings without degrading, stays warmer underfoot, and if a spring thaw event causes water entry, it can be dried out and reinstalled. Epoxy floor coating is the better decorative concrete option for NB basements — it's applied rather than ground into the slab, costs $5–$10/sq ft, handles moisture better, and is far more practical for a utility or workshop area.

Before any flooring decision, confirm your slab has no active moisture issues. A simple plastic sheet test — tape a 600mm square of poly to the slab for 48–72 hours and check for condensation underneath — gives you a rough read. A contractor can do a proper calcium chloride or RH probe test for more reliable results.

If you're set on a concrete aesthetic, a stained or dyed concrete floor with an epoxy topcoat gives a similar industrial look at lower cost and with better moisture performance than a true polished finish.

Need help finding a Moncton basement flooring contractor who can assess your slab and give you an accurate quote? New Brunswick Basements can match you with local contractors for free through the New Brunswick Construction Network.