Bright, high-ceilinged sitting room with corner windows and a fireplace

Part 5 · Deciding

10 min read

What it costs, and how the number is built

Every figure on this page is a range, and every range has its assumptions written next to it. That is deliberate. A single confident number for something that depends on your room, your floor, your supply and this year's tariff order would be a marketing device rather than information.

Read on

By system

Four formats, four price bands

Installed cost per square foot, materials and labour together. The cheapest option is not the cheapest to own, and the table after this one shows why.

Dry-fit mat retrofit

₹230–320

per sq ft installed

A pre-spaced heating mat over thin insulation board, laid on the floor you already have. The cheapest way into a warm floor and the least disruptive.

Floor height added: 18–25 mm
Breaks your floor: No

Best for: Flats, single rooms, anyone who cannot be out of the house for a fortnight.

Watch for: Thin insulation means a higher running cost forever. Cheap quotes usually got cheap by thinning this layer further.

Most common

Cable with self-levelling screed

₹280–380

per sq ft installed

Loose resistive cable set out at a calculated spacing, buried in a thin self-levelling compound. More control over output than a fixed mat, in an awkwardly shaped room.

Floor height added: 25–35 mm
Breaks your floor: No

Best for: Rooms with alcoves, fixed furniture or an irregular plan that a rolled mat would waste.

Watch for: Spacing is set by hand, so this is the format most sensitive to who is doing the work.

Full screed build-up

₹320–450

per sq ft installed

Insulation, levelling bed, element and screed cover, built up properly from the slab. The lowest running cost available, at the highest disruption.

Floor height added: 100–140 mm
Breaks your floor: Yes

Best for: New construction, a full renovation, or a ground-floor room being rebuilt anyway.

Watch for: The screed needs a real curing period before first heat. Rushing it cracks the floor.

Fluid-filled pipe system

₹450–650

per sq ft installed

Warm water or glycol circulated through pipe loops in the floor, driven by a boiler, heat pump or other source. Not strictly an electric hamam, but the same warm floor.

Floor height added: 120–160 mm
Breaks your floor: Yes

Best for: Large villas and hotels, especially where the heat source is not the grid.

Watch for: Manifolds, pumps and a boiler are things that need servicing. The cheapest system to run is rarely the simplest to own.

By room

What that means for an actual room

The same four systems, priced against the rooms Kashmiri households usually heat. Figures are rounded to the nearest ₹500 — precision beyond that would be invented.

Installed cost by system type and room size
System	Bathroom45 sq ft	Bedroom120 sq ft	Drawing room200 sq ft	Ground floor650 sq ft
Dry-fit mat retrofit₹230–320 / sq ft	₹10,500 – ₹14,500	₹27,500 – ₹38,500	₹46,000 – ₹64,000	₹1,49,500 – ₹2,08,000
Cable with self-levelling screed₹280–380 / sq ft	₹12,500 – ₹17,000	₹33,500 – ₹45,500	₹56,000 – ₹76,000	₹1,82,000 – ₹2,47,000
Full screed build-up₹320–450 / sq ft	₹14,500 – ₹20,500	₹38,500 – ₹54,000	₹64,000 – ₹90,000	₹2,08,000 – ₹2,92,500
Fluid-filled pipe system₹450–650 / sq ft	₹20,500 – ₹29,500	₹54,000 – ₹78,000	₹90,000 – ₹1,30,000	₹2,92,500 – ₹4,22,500

Bathroom: The room most people heat first, and the one they regret least.
Bedroom: A standard 10 × 12 room.
Drawing room: The traditional hamam room in most Kashmiri houses.
Ground floor: Three rooms plus circulation, heated as zones.

The comparison that matters

Against a traditional stone hamam

For a 10 × 10 ft room — the size most Kashmiri hamam rooms actually are.

Traditional stone hamam

₹50,000 – ₹70,000

10 × 10 ft room, built new

Materials, quarried hamam stone and a specialist stone mason. Figures move with stone and cement prices and with how far the stone has to travel.

Then firewood, every day of every season, for as long as you use it.
Rarely retrofittable — the chamber and firebox usually mean building the room, not adapting it.
Needs a specialist hamam mason, and finding one is getting harder.

Electric hamam

₹23,000 – ₹45,000

Same room — retrofit at the low end, full screed at the high end

A dry-fit retrofit lands at roughly half the cost of a new stone hamam. A full screed build-up closes most of that gap, and a fluid-filled system exceeds it outright.

Then metered electricity, on a schedule you control room by room.
Retrofittable into a house that already exists, in about a week.
No firewood, no smoke, no soot, no daily firing.

Read this part twice

Comparing installation costs alone flatters electric heating, and comparing running costs alone flatters whichever fuel happens to be cheap this year. The honest comparison is over the life of the system, and it turns on two questions only you can answer: how reliable is your supply, and what does firewood actually cost where you live?

Running cost

The arithmetic, shown rather than asserted

Nobody should accept a monthly figure without the assumptions behind it. Here are ours — disagree with any of them and the numbers move.

Assumptions

Output: 15 W per sq ft connected
Hours switched on: 8 hours a day
Duty cycle: 45% — the fraction of that time the element actually draws power
Tariff: ₹4.5–6.5 per unit
Season: 4 months

The duty cycle is the assumption most worth arguing with. A well-insulated room in a mild week may sit far below 45%; a ground-floor room with thin insulation in January may sit well above it.

Estimated monthly and seasonal running cost by room size
Room	Connected	Per month	Full season
Bathroom45 sq ft	0.7 kW	₹328 – ₹474	₹1,312 – ₹1,896
Bedroom120 sq ft	1.8 kW	₹875 – ₹1,264	₹3,500 – ₹5,056
Drawing room200 sq ft	3.0 kW	₹1,458 – ₹2,106	₹5,832 – ₹8,424
Ground floor650 sq ft	9.8 kW	₹4,739 – ₹6,845	₹18,956 – ₹27,380

What actually moves your bill

In order of effect, and it is not the order most people expect:

Insulation depth. The difference between 8 mm and 50 mm under the element is the difference between a reasonable bill and an annoying one, and it lasts as long as the floor does.
Whether you schedule it. A floor heated for eight hours costs a third of a floor heated for twenty-four, and in most households nobody notices the difference except at the meter.
How many rooms you heat. The cheapest square foot is the one you decided not to heat. Three rooms done well beats seven done thinly.
Your windows. Underfloor heating in a single-glazed room is a bucket with a hole in it. This has nothing to do with the heating system and everything to do with the bill.
The tariff. The one thing on this list you cannot control, and the one that has moved most in recent years.

Still weighing it up?

Talk it through with someone who has installed these in the Valley

Every figure on this page is a range. Give us your room dimensions and your tariff and we will work the same arithmetic on your actual numbers — including the answer that you should spend the money on windows first, if that is the answer.

Talk to our expert +91 194 000 0000

Part 5 of 10

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