Radiant Floor Heating
Warm floors, even heat, and a house that finally feels calm
Radiant heat delivers warmth where you actually live — at floor level — with no blasts of hot air and no dust blown around the house.
Done right, it's one of the most-loved things in a custom home. Done casually, it's an expensive disappointment. We design radiant as a complete system — envelope, heat source, tubing and controls together — so it feels like the room is quietly cheating.
What radiant floor heating actually is
Hydronic radiant heating runs warm water through tubing in (or under) your floor. The whole floor becomes a gentle, low-temperature radiator, warming people and objects directly instead of pushing hot air toward the ceiling. That's why a radiant room feels even and quiet — the heat is where your feet are, and the system doesn't have to "blast" to keep up.
The catch: radiant isn't a "nice upgrade" you sprinkle on at the end. It's a full system. Tube spacing, water temperature, insulation under the heat, and controls all have to be planned together. That planning is the difference between radiant that feels incredible and radiant that never feels quite right.
We'll be honest about when radiant pays off
Radiant is worth it when…
- You're building or renovating and can insulate properly under the heat
- You want even, quiet comfort and better air quality
- You're pairing it with a high-performance envelope (especially ICF)
- You're planning an air-to-water heat pump as the heat source
- You care about how the home feels, not just the spec sheet
Think twice when…
- It's bolted onto a cold, under-insulated floor — you'll heat the structure, not the room
- It's treated as a casual add-on with no system design
- Nobody has planned water temperature and controls
- You're chasing the lowest quote over a properly engineered system
Best-fit uses in a custom home
Bathrooms & ensuites
The classic "never cold tile" upgrade — the one people notice first and love most.
Garages & workshops
A heated slab you'll actually use in February — as long as it's insulated underneath (or you're heating the earth).
Whole-home in an ICF build
Slab-on-grade or suspended floors, designed around the home. This is where radiant + ICF is at its best.
Radiant + an air-to-water heat pump
Modern high-performance homes don't need screaming-hot water — they need steady, low-temperature heat. That's exactly what an air-to-water heat pump delivers, distributed through your in-floor tubing. It's why radiant has shifted from "luxury add-on" to core system strategy.
The combo that unlocks the incentives
Radiant floors aren't usually a rebate line-item on their own — but they sit right beside upgrades that are. Ontario's Home Renovation Savings program lists rebates for heat pumps (up to $12,000) and smart thermostats. Pairing radiant with a heat pump is where homeowners win.
No fantasy numbers — here's what drives the price
Radiant cost in Ontario depends far more on how it's designed than on a per-square-foot rule of thumb. Don't budget radiant by $/sq ft — it hides the decisions that actually matter.
Heat source
Boiler vs. air-to-water heat pump changes both the install and your running cost for the life of the home.
Insulation under the heat
Skimp here and you pay to heat the slab and the ground forever. Insulate properly and the system runs lean.
Floor assembly
Slab-on-grade is straightforward; suspended floors need careful tube spacing, plates and water-temp planning.
Controls & zoning
Good controls are what make radiant feel effortless — and what keep operating cost sane.
Home size & layout
Area, zoning and finish choices move the number more than any single "rate."
The envelope
A tighter, better-insulated home (like ICF) needs less heat — which shrinks the whole system.
Want a real ballpark for your build?
Skip the misleading per-square-foot math. Use the calculator, or send us your plans and we'll give you an honest number.
Radiant likes stable. ICF likes stable.
ICF homes are tighter and more thermally stable when they're detailed properly — lower heat loss, steadier indoor temperatures, and no need for high-temperature blasts to claw comfort back. Radiant thrives in exactly that environment. Pair them correctly and you get a home that feels calm: warm, even, and quiet, without the furnace running like it's trying to win a race.
Radiant floor heating, answered honestly
Is radiant floor heating cheap to run?
Does it work with a heat pump?
Can I put radiant in just a few rooms?
What do builders get wrong with radiant?
Slab-on-grade or suspended floor — does it matter?
Why not just use forced air?
Thinking about radiant in your build?
Let's design it as a complete system from the start — envelope, heat source, tubing and controls together — so it feels right on the coldest day of the year.
