Radiant Floor Heating Cost Calculator

Radiant floor heating typically costs $10 to $25+ per square foot installed, so most projects run $2,000 to $12,000. A small electric system for one bathroom might be $500 to $1,500, while a whole-home hydronic system can run $15,000 to $30,000+ including the heat source. A 500 sq ft hydronic-tubing retrofit under tile lands near $8,500 in this calculator. Cost is driven by the floor area heated, the system type (electric mats are cheapest to install but pricier to run and best for small areas; hydronic tubing costs more to install but less to run; a full hydronic system with a boiler is the most), the installation type (new construction cheapest, retrofit typical, slab removal most), and the floor covering (tile/stone ideal). Add-ons like a boiler, manifold, extra zones, old-flooring removal, subfloor prep, and a smart thermostat add on top. A ~$800 job minimum applies. Enter your area and system above for a localized estimate.

They're the two main types and differ in install cost, running cost, and ideal use. Electric radiant uses thin heating cables or pre-spaced mats installed under the floor (often in thinset under tile). It's cheaper to install, thin (good for retrofits with minimal floor-height change), simple (no plumbing or boiler), and quick to warm up — but electricity costs more to run, so it's best for small areas and spot heating like bathrooms, kitchens, and entryways, not whole homes. Hydronic (water) radiant circulates warm water through PEX tubing in or under the floor, heated by a boiler, water heater, or heat pump and moved by a pump. It costs more to install (tubing, manifold, heat source, plumbing) and is thicker, but it's much cheaper to operate — making it the cost-effective choice for large areas and whole-home heating over time. In short: electric for a bathroom or small room (cheap, simple install); hydronic for whole-home or large-area heating (efficient to run). This calculator includes both, plus a full hydronic system with a heat source.

For comfort-focused homeowners, often yes. Radiant heat is widely considered the most comfortable form of heating: even, gentle warmth from the floor up with no cold spots, drafts, or temperature swings, and warm floors underfoot — especially luxurious on tile in a bathroom. It runs silently with no blown air, so it doesn't circulate dust or allergens, and it hides in the floor with no radiators or vents taking up wall space. It can be efficient too: because it warms surfaces directly, you feel comfortable at a lower thermostat setting, and hydronic systems with an efficient heat source are economical to run. The trade-offs are a higher upfront cost (especially hydronic with a boiler, or a retrofit that involves floor work) and a slower warm-up than forced air. It's most worth it in new construction or a major renovation (when install is cheapest), for whole-home hydronic, or as an affordable electric warm-floor upgrade in a bathroom. Weigh the comfort and efficiency against the upfront investment for your situation.

Tile and natural stone are the best and most common, because they conduct and store heat efficiently and aren't affected by the warmth — which is why radiant heat is so popular in tiled bathrooms and kitchens. Polished concrete is excellent too (great thermal mass, common in slab hydronic systems). Many other floors work with the right product: engineered wood is dimensionally stable and a popular choice; laminate and luxury vinyl often work when rated for radiant heat (respect the temperature limits); and thin, low-tog carpet rated for radiant heat is usable, though thick carpet and padding insulate and reduce the system's effectiveness. Solid hardwood needs the most caution — it can gap, cup, or crack from heat and humidity swings, so choose stable species, acclimate it, keep temperatures moderate, and follow strict guidelines (engineered wood is generally safer). The key rules: use radiant-rated flooring, respect maximum floor-temperature limits, and prefer high-conductivity, dimensionally stable materials. This calculator prices tile/stone as the baseline, with laminate/vinyl and carpet/wood adding a bit for the extra care.

Yes — a retrofit is very doable, though more involved than installing during new construction, and the best method depends on the system and floor structure. Electric radiant is the easiest retrofit: the thin mats or cables add minimal height and go down over the existing subfloor (in thinset under new tile, for example), so it's commonly done as part of a bathroom or flooring renovation. Hydronic retrofits are more involved but have options: low-profile above-floor panels with channels for the tubing installed over the subfloor, or below-floor tubing with heat-transfer plates between the joists when the underside is accessible from a basement or crawl space, or a new slab if you're removing the floor. The main considerations are floor height (a raised floor may mean adjusting doors and transitions — electric minimizes this), timing it with a flooring replacement (the ideal moment to add radiant underneath), and, for hydronic, adding a compatible heat source. Retrofits cost more than new construction, and whole-home hydronic retrofits are a significant project best done during a major renovation. This calculator includes retrofit and slab-removal options.

It ranges from a day or two for a small electric system in one room to one or two weeks or more for a whole-home hydronic system. An electric system in a single bathroom is often 1 to 3 days, done as part of the flooring: lay the mats or cables, connect the thermostat, then install the tile on top (with thinset and grout curing). A hydronic system is more involved and commonly takes about 1 to 2 weeks for a whole home: laying out the tubing (in panels, under the subfloor, or in a slab), installing the manifold(s), the heat source and pump, the plumbing and controls, pressure-testing, and then the flooring. The timeline stretches with area size, retrofit complexity, slab curing, multiple zones, and the flooring work it's coordinated with. Because radiant is usually installed with new flooring, it's typically part of a larger renovation or build rather than a standalone job. Your contractor can give a firm schedule based on your system and scope.

Operating cost is where electric and hydronic diverge, and it often matters more than the install price over the life of the system. Electric radiant is inexpensive to run for a small area — a bathroom floor for an hour or two a day costs little — but it becomes expensive to heat large areas or a whole home, because electric resistance heating is a costly way to make heat. That's why electric is best kept to small spaces and spot heating. Hydronic is much cheaper to operate at scale: it moves heat from an efficient source (a modern boiler or, increasingly, a heat pump) through water, so heating a large area or whole home costs far less per month than electric would. This is the crux of the choice: electric wins on install cost, hydronic wins on running cost, and for anything beyond a room or two the lower hydronic operating cost usually justifies its higher upfront price over time. Pairing radiant with good insulation and a smart thermostat trims running costs further.

It can, and by how much depends on the system. Electric mats and cables are thin — typically adding only about 1/8 to 1/4 inch plus the thinset and tile — so they barely change the floor height, which is a big reason they're favored for retrofits. Hydronic systems are thicker: above-floor retrofit panels add roughly 1/2 to 1-1/2 inches, and embedding tubing in a new slab or a poured overlay adds more. Any added height can affect door clearances, thresholds and transitions to adjacent rooms, cabinet toe-kicks, and the last stair riser, so it's planned for in advance — doors may be trimmed and transitions adjusted. Below-floor hydronic (between the joists from underneath) adds no height to the finished floor at all, which is why it's a good option when the underside is accessible. If floor height is a constraint, tell your installer up front — the system type and install method are chosen partly around it.