ᐅ Is it practical or necessary to have heating installed in the basement?

Hello everyone,

we are currently planning our house (timber frame construction, KfW 50 or KfW 40 standard) and I am considering whether to include heating in the basement after all.

Here is our basement plan and the wall construction.

The perimeter insulation is 14 cm (5.5 inches) thick. The slab is concrete class C 25/30 and 20 cm (8 inches) thick. The exterior walls consist of two-layer precast concrete elements (class C 25/30) with the appropriate reinforcement.

At the moment, two heating options are being considered:

Option 1: district heating + underfloor heating on ground floor and first floor
Option 2: air-to-water heat pump + underfloor heating on ground floor and first floor

I would like to use room K.03 (Basement 2) as an office when I work from home.

Is it advisable to install underfloor heating in the basement as well, or are there alternatives for the heat sources mentioned above? Also, does it make sense to extend the mechanical ventilation with heat recovery to the basement?

Thank you very much for your feedback and answers!

Best regards
Björn

Hello,
Mechanical ventilation in the basement? Absolutely yes, especially if you want to do without heating.
If mechanical ventilation is already planned, the additional costs are not that high. Mechanical ventilation in the basement also allows you to avoid installing windows in storage rooms or the utility room, which saves money.
Heating is something I thought about a lot as well. With 14 cm (5.5 inches) of insulation in the basement, ventilation should almost be sufficient. For a home office, you can still install an electric heater on the wall (which, of course, significantly worsens your environmental footprint, but you can exclude it from the KfW calculation). Financially, that might be cheaper. Underfloor heating in the basement is nice though, especially if used as an office space.
In the end, we decided to invest in underfloor heating.

Best regards,

Andreas

Since the heating system is located in the basement anyway, it’s not a big effort.
We have underfloor heating in the hallway and the office/guest room, but not in the utility room and storage room. The equipment itself slightly warms these rooms, and the storage room is meant to be a bit cooler anyway. However, the heating circuit manifold is also located there, so it doesn’t get completely cold.

We have two large rooms in the basement, the utility room and the hallway.

Use
I would like to use room K.03 as an office/hobby room.
In room K.02, I plan to set up a workshop and store supplies.

Is it advisable to install heating/controlled mechanical ventilation in all rooms or only in room K.03?

Thanks for your advice!

Where supplies are stored, I would avoid installing heating. Depending on the type of supplies to be stored, it is better if they are kept as cool as possible. By the way, a freezer chest is also well suited for a cool basement.

We installed a mechanical ventilation system in all five basement rooms and decided to skip the small windows because I find the light wells/grilles very disruptive, and this solution does not provide enough natural light in any case. Three rooms will have underfloor heating: guest room, bathroom, and hobby room. The house utility room and storage room will not have underfloor heating. The storage room also has two fully separate, protected outlets intended for an additional refrigerator and freezer.