ᐅ Composition of the Lump Sum Costs for Residential Construction
Created on: 28 Sep 2012 23:38
M
Markus13Hello everyone,
I am also planning to take on the adventure of building a house in the near future. Unfortunately, I am still quite a beginner in this field, so at the moment I have many more questions than answers...
From what I have found, initial rough estimates of the expected construction costs for a single-family house often refer to flat rates, for example, 300 € per cubic meter of gross volume or 1,500 € per square meter of living area.
How are such flat rates composed? Are there guidelines showing how these estimates are distributed across the different trades (shell construction x%, roof y%, heating z%, etc.)?
Or to put it another way, how are the total construction costs typically divided as percentages among the various trades?
What is your assessment? I understand these can only be very rough estimates, but after all, the flat rates mentioned above are rough estimates as well.
I appreciate any feedback.
Best regards,
Markus13
I am also planning to take on the adventure of building a house in the near future. Unfortunately, I am still quite a beginner in this field, so at the moment I have many more questions than answers...
From what I have found, initial rough estimates of the expected construction costs for a single-family house often refer to flat rates, for example, 300 € per cubic meter of gross volume or 1,500 € per square meter of living area.
How are such flat rates composed? Are there guidelines showing how these estimates are distributed across the different trades (shell construction x%, roof y%, heating z%, etc.)?
Or to put it another way, how are the total construction costs typically divided as percentages among the various trades?
What is your assessment? I understand these can only be very rough estimates, but after all, the flat rates mentioned above are rough estimates as well.
I appreciate any feedback.
Best regards,
Markus13
B
Bauexperte29 Sep 2012 16:27Hello,
Many years of experience
Aside from the fact that such an assessment is not really possible—every single-family home is different—what benefit do you think you could gain from such a breakdown?
No, €1,500/sqm (approximately $1,600/sqft) of living space is actually a very realistic figure for building a new single-family house according to the current energy saving regulations, using a gas condensing boiler and solar water heating. Anything below that should be approached with caution, while costs above this depend on the technology and fittings used.
Keeping this benchmark in mind, along with the fact that a closed shell structure should never be paid for with more than about 58-60% of the total construction budget, will be more helpful than any rough percentage allocation of the 13 trades.
Kind regards
Markus13 schrieb:
How are such lump sums broken down?
Many years of experience
Markus13 schrieb:
Are there any guideline values showing how these estimates distribute across the various trades (shell construction x%, roof y%, heating z%, etc.)? Or put differently, how do the total construction costs percentage-wise divide among the trades?
Aside from the fact that such an assessment is not really possible—every single-family home is different—what benefit do you think you could gain from such a breakdown?
Markus13 schrieb:
... but those are also just the flat rates mentioned above after all.
No, €1,500/sqm (approximately $1,600/sqft) of living space is actually a very realistic figure for building a new single-family house according to the current energy saving regulations, using a gas condensing boiler and solar water heating. Anything below that should be approached with caution, while costs above this depend on the technology and fittings used.
Keeping this benchmark in mind, along with the fact that a closed shell structure should never be paid for with more than about 58-60% of the total construction budget, will be more helpful than any rough percentage allocation of the 13 trades.
Kind regards
Hello,
thank you very much for this assessment; it already helps me quite a bit.
What exactly does "closed shell construction" mean in this context? Site excavation, all masonry work (including brick facing?), roof truss with covering, as well as windows and doors?
Best regards
Markus13
thank you very much for this assessment; it already helps me quite a bit.
What exactly does "closed shell construction" mean in this context? Site excavation, all masonry work (including brick facing?), roof truss with covering, as well as windows and doors?
Best regards
Markus13
B
Bauexperte10 Oct 2012 14:04Hello,
The facade (rendering or brick cladding) is applied only after the window installation is complete; this is typically reflected as a standard 10% deduction in most payment schedules.
A "refined shell" refers to the stage when the facade is also finished. This option is generally chosen when all interior work is subcontracted or carried out by the owner-builder.
Best regards
Markus13 schrieb:A closed shell usually includes: excavation work (generally stripping topsoil; sometimes also reapplying and compacting it—provided the material is suitable), exterior and interior masonry, carpentry, roofing, and the trade responsible for windows including the front door.
What does "closed shell" mean in this context? Excavation work, all masonry work (including brick facing?), roof structure with covering, as well as windows and doors?
The facade (rendering or brick cladding) is applied only after the window installation is complete; this is typically reflected as a standard 10% deduction in most payment schedules.
A "refined shell" refers to the stage when the facade is also finished. This option is generally chosen when all interior work is subcontracted or carried out by the owner-builder.
Best regards
That was very quick, thank you.
Could you possibly give me an estimate of what portion of the architect’s fee according to HOAI is appropriate for the service phases 6 to 9, if the architect only oversees the construction up to the completed shell with high-quality finishes? Around 50%? (Typical single-family house without special extras).
A rough guideline would be very helpful.
Regards
Markus13
Could you possibly give me an estimate of what portion of the architect’s fee according to HOAI is appropriate for the service phases 6 to 9, if the architect only oversees the construction up to the completed shell with high-quality finishes? Around 50%? (Typical single-family house without special extras).
A rough guideline would be very helpful.
Regards
Markus13
B
Bauexperte10 Oct 2012 14:45Hello,
Best regards
Markus13 schrieb:You can easily determine the expected costs from the fee table.
Could you possibly give me an estimate of what proportion of the architect's fee according to HOAI is appropriate for service phases 6 to 9, if the architect only oversees the construction up to the building envelope stage? About 50%? (Standard single-family house without special features).
Best regards
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