Residential basement, study room, additional charge

Hello,

we have received an offer from the developer for additional costs for increasing the basement height and expansion with a study room including underfloor heating and a daylight window approx. 16sqm over 8000€.

Is the surcharge OK?

What should one consider with such an expansion?

It is a semi-detached house with underfloor heating and an air heat pump.

Thank you in advance!

Calculate it!

How many stones are that extra?

What do you want to argue against that? I don't find it exaggerated instinctively - but I would either heat a basement completely or not at all.

Hello,

it is a 6m x 10.5m semi-detached house...
in the basement, an approximately 18-20 sqm office room should be heated, the rest is a small storage room and a technical/laundry room.
I thought it would not be necessary to heat the storage room and technical/laundry room.
What disadvantages/problems (can) arise with a partially heated basement only?

Thank you very much for your help!

Hello,

we have received an offer from the developer for additional costs for increasing the basement height and finishing with a study room including underfloor heating and a daylight window of about 16 sqm for over €8000.

it is a 6m x 10.5m semi-detached house...
in the basement, there should be a heated office room of about 18-20 sqm, the rest is a small storage room and a technical/laundry room.
I thought it wouldn't be necessary to heat the storage room and the technical/laundry room.

Is the additional cost OK?

The price does not seem too high to me; rather too low. The entire basement will be raised to 2.50 m clear height, screed and underfloor heating will be installed, and most likely the electrical work in the study room will be laid under plaster; in addition, a living room window. I would also recommend having a ventilator installed in the study room.

Take into account in your calculation that you will have to transport more excavation material; I do not assume that the basement will be underpinned around the story increase.

Rhenish regards

Ventilation is not unimportant, I think. Especially when you heat air and then it passes through open doors into cold rooms. Furthermore, I would make sure that the calculated heating still fits (although it is usually oversized anyway).