Cozy warm underfloor heating room
How to measure up

How to measure up for Underfloor Heating

Measuring for underfloor heating within you property is an easy task to complete. You'll need to gain your available heated area following these 3 easy steps.

Top-down floor plan of an empty room
Step 1

Room Size

Measure the Length and Width of the room to work out the overall square metres of the room.

Bathroom interior with fixed furniture
Step 2

Fixed Furniture

A standard deduction of 20% is applied to the total room area to account for fixed furniture and built-in fittings, including kitchen units, islands, storage radiators, bathroom suites, and similar immovable fixtures. This ensures your underfloor heating coverage is calculated on the actual usable floor space.

Clean modern floor ready for underfloor heating
Step 3

Total Area

Once these deductions are applied, you will be left with your heatable floor area.

Heatable Area Calculator

Find the perfect system size in seconds. Enter your room dimensions, deduct any fixed furniture, and we calculate the heatable area for you.

1. Measure your room

Enter the length and width of the full room, wall to wall.

2. Window Information

Measure from the bottom edge of the window down to the finished floor level. This helps our installation team assess your electric hamam installation requirements.

Why We Need This Measurement

The window sill height helps us understand room layout constraints and installation conditions, ensuring your electric hamam system is correctly specified.

Measure from the bottom edge of the window to the finished floor. Optional, leave blank if not applicable.

3. Measure your un-heatable areas

Under floor heating cannot be laid under fixed furniture or appliances without an installation underneath. Please add each applicable area.

Area Name
Width (m)
Length (m)
Total (m²)

Enter your room width and length to enable the calculator.

Things to consider

Different systems, different considerations. Here's a quick overview to help you choose the right one for your project.

Electric underfloor heating cables close-up
Electric

Electric Underfloor Heating

When purchasing your mat system, you'll reduce this heatable area by 10% to allow for a 50mm to 100mm perimeter around the room, along with an allowance to space matting so it doesn't overlap.

For areas that are awkward in shape such as bathrooms a loose cable is suggested, this will maximise the heating area, provide an easy install solution and a more efficient and even heat.

The underfloor heating element cannot be shortened in length as this will invalidate your lifetime warranty so ordering the correct size system is essential.