Share of trades in % of the total construction cost

Hello,

the plan is a new building in solid construction.

I already have a turnkey offer from the same construction company as well as an offer that "only" includes the shell construction.

Both offers are based on the same floor plan.

Are there any experience values regarding the share of each trade (shell construction, electrical, heating, etc.) of the construction sum?

Thanks for the information

Hello,

the plan is a new build in solid construction.

I already have a turnkey offer from the same construction company as well as an offer that “only” includes the shell construction.

Both offers are based on the same floor plan.

Are there any experience values regarding the share of each individual trade (shell construction, electrical, heating, etc.) of the total construction cost?

Thanks for the info

I would also be interested in this. Does anyone have information on this?

A meaningful comparison is only possible with several offers that have the same scope of services. Buildings are simply too different for that. The shell construction usually costs six figures, so a 10% inaccuracy corresponds to €10,000 and more. No one can compare that, especially not offers. For example, a shell construction with a basement costs significantly more than one without. A monolithic wall is significantly more expensive than a wall made of calcium silicate bricks, because in the latter case the ETICS is added separately, which, however, does not belong to the shell construction. These are ranges of several tens of thousands of euros when asking about "costs for shell construction". It makes no sense.

Three offers for the same floor plan result in the following average values with us (the providers differed by up to 3% in individual trades, but overall very homogeneous):

Site setup 1.6%
Earthworks 0.9%
Base slab 9.4%
Ground floor 16.5%
Chimney 1.4%
Roof frame 6.8%
Roof covering 9.1%
Plumbing work 1.6%
Roof - sheathing 0.0%
Windows 7.7%
Drywall 4.9%
Screed 1.7%
Interior plaster 3.8%
Interior doors 1.0%
Heating 9.1%
Ventilation 3.9%
Sanitary 3.2%
Electrical 3.0%
Tiling 3.4%
Facing brick 11.1%
100.0%

Are there any empirical values regarding the share of each individual trade (shell construction, electrical, heating, etc.) in the total construction cost?

No, there cannot be any – not even for a specific class (e.g., detached single-family house 120 to 130 sqm) because everyone wishes for something different, both concerning the shell and the finishing work. The more examples like in #4 you can collect, the more likely their average will approximate your later "actual," but frankly without any guarantee.

The finishing work has a wider range than the shell construction. Even with tiles and fittings, tastes differ greatly across price categories. Electrical work is also a vast field with a huge price lever. For example, I don’t care about designer lamps, but I hate cascades of extension multi-socket outlets; electricity belongs in the wall for me. Do you only want to switch lights, or should your freezer send an SMS itself when it switches to emergency power?

And: where is your personal boundary between shell and finishing work: do you count wooden steps as stair "covering" as part of the shell construction because otherwise the stair would not be structurally complete, or as part of the finishing because it is supposed to transition into parquet? – Such examples of fluid boundaries are rare, but the taste-driven price lever of individual "standards" is large and makes comparisons between Müllers and Meiers correspondingly difficult.

Such examples of fluid boundaries are rare, but the taste-related price lever of individual "standards" is large and makes comparisons between Müllers and Meiers correspondingly difficult.

Moreover, every construction company also calculates somewhat differently. For the ground floor, the deviation was a good 3%. Besides individual "extras" that correspondingly affect these figures, there are also fundamental issues. The brick facade is quite expensive, so with a plaster facade the costs would probably only be 7%, and all other trades would gain a bit accordingly. Etc..