Building a single-family house: Is the calculation consistent?

Hello everyone,

I am currently working on a first calculation for our planned single-family house with standard equipment (175 sqm living space, gable roof with skylights, knee wall 1.20 m, basement, plot with hillside location).

In particular, the incidental building costs (excavation, removal of soil, utility connections, surveying, building permit, etc.) are, according to my research, a difficult figure to calculate. The costs for the interior finishing (floor coverings, wallpaper, plastering, painting) and the kitchen are based on available offers.

I would be interested to know whether the total calculation (= ready-to-move-in house with completed exterior facilities) is realistic from your point of view?

In your opinion, where might there still be potential savings or where have I perhaps calculated too tightly?

Thank you for your opinions!



[TD="class: xl64, width: 270"]Plot price without incidental costs (727 sqm)

[TD="class: xl66, width: 104, align: right"]210,830


[TD="class: xl64"]land transfer tax + notary (6%)
[TD="class: xl65, align: right"]12,650



[TD="class: xl64"]construction costs without basement

[TD="class: xl65, align: right"]265,000



[TD="class: xl65, align: right"]



[TD="class: xl64"]basement (prefabricated basement, waterproof concrete)

[TD="class: xl65, align: right"]40,000


[TD="class: xl64"]incidental building costs (15% of construction costs)
[TD="class: xl65, align: right"]39,771



[TD="class: xl64"]external construction supervision

[TD="class: xl65, align: right"]3,500



[TD="class: xl64"]exterior facilities

[TD="class: xl65, align: right"]15,000


[TD="class: xl64"]kitchen
[TD="class: xl65, align: right"]10,500


[TD="class: xl64"]interior finishing
[TD="class: xl65, align: right"]25,000



[TD="class: xl64"]wood stove + chimney
[TD="class: xl65, align: right"]5,000


[TD="class: xl64"]garage (multibox) with floor slab
[TD="class: xl65, align: right"]13,000


[TD="class: xl64"]lump sum additional costs

[TD="class: xl65, align: right"]10,000


[TD="class: xl68"]TOTAL

[TD="class: xl67, align: right"]651,905

Hello,

I am currently working on an initial calculation for our planned single-family house with standard equipment (175 sqm living area, gable roof with skylights, knee wall 1.20m, basement, plot with slope).

Where do you want to build? Is the building body planned to be rather straightforward or rather convoluted? Exterior dimensions of the building body? How steep is the slope?

Best regards from the Rhineland

Hello,


Where do you want to build? Is the building body rather straightforward or rather angled? Exterior dimensions of the building body? How steep is the slope?

Rhineland greetings

We want to build in the Rhine-Main area. The building body is straightforward without significant angles, except for a small bay window on the ground floor. How do I determine the slope? At the higher part we have 205 meters above sea level and at the lower part 200. The length of the plot is just over 19 meters. Does that help?

Wood stove + chimney 5 thousand euros will probably not be enough. The chimney alone is about 5 thousand euros and then the wood stove + installation is added. For me, that was about 6 thousand euros. I see construction costs as realistic.

We will also build in the Rechtsanwältin/Main area. I estimate for our house (approx. 150 sqm living area, according to Kfw 70), a height difference of 0.40 meters along the length of the house, without a basement and without complicated special features, €255,000 (excluding ancillary construction costs). In addition, there will be flooring and outdoor surfaces.

In my opinion, 5000 € for chimney and flue is not enough. The flue itself already costs 4,500 €.