Cost to Hydronic Radiant Floor Heating in St. Louis, MO

$8,800–$19,360 in St. Louis

12% below the national average · 0.88x cost multiplier

In St. Louis, a hydronic radiant floor heating runs $8,800 to $19,360 on average — about 12% below what homeowners pay nationwide. The Midwest market's labor costs account for most of the gap, with material pricing and local permitting fees adding to the spread. Use the cost table below to compare budget, mid-range, and premium options side by side.

Cost Breakdown in St. Louis

Line Item	Low	Mid	High
Cost per sq ft	$5	$11	$18
Materials	$3,080	$5,720	$10,560
Labor	$3,080	$5,280	$8,800
Permits	$264	$440	$704
Total	$6,424-12% vs. national avg	$11,880-12% vs. national avg	$21,120-12% vs. national avg

Budget

Single-zone hydronic system in new construction or accessible crawlspace, PEX tubing in a 500 sq ft area with existing boiler

Mid-Range

Multi-zone system covering 1,000 sq ft with dedicated manifold, new circulator pump, thermostat controls

Premium

Whole-house system (1,500+ sq ft) with dedicated condensing boiler, multiple zones, smart thermostats, and premium subflooring

Material Options

Material prices below are national averages; availability in St. Louis may shift costs slightly.

Material	Cost/Unit	Pros	Cons	Best For
PEX Tubing (Standard)	$0.50-$1.00/linear ft	Flexible, corrosion-resistant, easy to route, 50+ year lifespan	Cannot be exposed to UV light, needs proper oxygen barrier	Most residential hydronic radiant installationsFlexible, corrosion-resistant, easy to route, 50+ year lifespan
PEX-AL-PEX (Aluminum Layer)	$1.00-$2.00/linear ft	Holds shape after bending, built-in oxygen barrier, lower expansion	More expensive, less flexible than standard PEX, fewer fitting options	Tight routing situations and high-oxygen-sensitivity systemsHolds shape after bending, built-in oxygen barrier, lower expansion
Thin-Slab Overpour (Gypcrete)	$3-$6/sq ft installed	Excellent thermal mass, even heat distribution, quiet	Adds 1-1.5 inches of floor height, heavy, longer cure time	New construction or major renovations where floor height change is acceptableExcellent thermal mass, even heat distribution, quiet
Aluminum Transfer Plates (Staple-Up)	$2-$4/sq ft	No floor height change, works from below, faster install	Slightly less even heating, requires accessible floor joists	Retrofits with accessible basements or crawlspacesNo floor height change, works from below, faster install
Structured Insulation Panels	$4-$8/sq ft	Pre-grooved for tubing, insulation built in, fast installation	Higher material cost, adds some floor height, limited to certain tubing sizes	Retrofit over existing subfloor where access from below is not possiblePre-grooved for tubing, insulation built in, fast installation

Other Projects in St. Louis

Full Kitchen Remodel

Basement Finishing

Roof Replacement (Asphalt Shingles)

Back to national average for Hydronic Radiant Floor Heating

St. Louis Estimate

Typical Range

$8,800–$19,360

vs. National Average

12% below national

Cost Multiplier

0.88x

Cost Per sq ft

$5–$18

Estimates apply St. Louis's 0.88x regional cost multiplier to national averages. Actual bids vary by contractor, project scope, and timing.

See national average costs →