ᐅ Is the cost estimate for the basement (finished basement) realistic?

Hello everyone,

My wife and I are planning to build a single-family house (1.5 stories) that will have a full basement. The basement is intended to serve as living space with a small WC, a hobby area, a study, storage, a boiler room, a hallway, and a sauna/shower. We do not yet have a floor plan. Can anyone share their experience or provide some feedback? We have the following offer/description:

Full basement constructed as a waterproof shell ("white tank") about 68m² (730 ft²)
Cost: 88,500 EUR

Includes perimeter insulation
Includes reinforced concrete stairs (without finish) starting from the ground floor
Includes screed
Includes electrical installations
Includes heating
Includes interior plaster
Includes 6 interior doors
Includes windows with light wells

Does anyone have tips on whether something important might be missing or unclear here?

Best regards and thanks in advance
mega

Costs for Earthworks?

Of course, your description is not very detailed. For example, electrical work: How many outlets, light fixtures, circuits, network, TV, special protection (sauna?).
And very importantly, flush-mounted? Also in exterior walls?

Everything is far too vague and lacking detail.

Hi,

ok, I’ll add a bit more, which I indeed forgot earlier:

Earthworks are included.
The ground will be prepared, a separating layer will be installed, and according to the structural engineering requirements, a roughly 20cm (8 inches) thick concrete slab will be poured. A galvanized foundation earth conductor with connection tab will be embedded in the base.

The clear structural height is about 2.50m (8 ft 2 in). Exterior and interior walls will be built from aerated concrete blocks or sand-lime bricks, as specified by the structural engineer. The exterior walls are 24cm (9.5 inches) thick, and the interior walls vary between 11.5cm (4.5 inches) and 24cm (9.5 inches) (basement corridor), according to the structural design.
The basement walls in contact with the soil will be waterproofed externally up to the top of the surrounding ground level against non-pressing water according to DIN 18195 Part 4. The base of the walls will be sealed up to about 30cm (12 inches) above ground level according to the same standard. The exterior walls will include three openings for basement windows measuring 1.0m x 0.75m (3 ft 3 in x 2 ft 6 in).

Three white uPVC windows with insulated glazing will be installed. Interior window sills will be made of Jura marble, extending 20cm (8 inches). If necessary, basement light wells without an extension and with a cover grate will be installed.
Connections from the light wells to drainage systems need to be ordered separately.

Electrical: Wiring will be installed flush-mounted, with one switch, one ceiling outlet, and one socket outlet. Additional installations are not included.
The basement corridor will receive a gypsum plaster finish of quality Q2, including corner protection strips.
A floating cement screed will be laid over insulation (about 18cm (7 inches) thick) in the basement corridor according to the heat demand calculation. The other rooms will have the exposed concrete floor slab.

That’s all I have for now.

Is 68sqm (732 sq ft) the usable living area? The floor area should be significantly larger, right?

Possibly a sump pump system if the shower and toilet are to be installed in the basement.
By the way, the description does not sound to me like that of a waterproof concrete tank (white tank).

stefanc84 schrieb:
68sqm is the usable living area? The floor area must be significantly larger, right?

Hi Stefan, the offer states "net floor area"... Regards