Cost estimation KfW 40+, calculation of full floors

  • Erstellt am 2016-11-02 09:57:05

reeneex

2016-11-02 09:57:05
  • #1
Good morning everyone,

we have decided to build a solid single-family house with Ytong. Our responsible regional Ytong partner sent us a cost estimate for our 2 designs.
We are a bit uncertain about the amount. We have not found many or any details regarding the DIN used.
Maybe someone here is familiar with it and can help us. We would like to know how the 2 prices per cubic meter he used are composed. Can I maybe save here? What would the price be for KfW 55 or completely without KfW?
We would like to be able to compare the different costs.

Thank you for your help

About the house: In general, it should be KfW 40+.
Since the building window on the plot is limited, we cannot exceed a certain size. The max is 12m wide x 15m deep. Max height is 6.75m. Maximum 2 full floors. In addition, a prescribed ridge parallel to the street.
There is also a slight slope on the plot, which we want to use to place the "basement rooms" on this side.

We sent 2 designs to the architect from Ytong.
No. 1: 2 full floors with cold roof
No. 2: 2 full floors with converted roof, knee wall 1m. For this, we get an exemption with the building application. I spoke to the responsible building authority about this.

His calculation is as follows:
2 full floors
Calculation of the enclosed space according to [DIN 277]
Length Width Area Height Factor Volume

Basement floor
11.27m x 12.92m = 145.61m² x 2.95m x 1.0 = 429.54m³
built-up area = 145.61m² / 429.54m³

Ground floor
11.27m x 12.92m = 145.61m² x 2.95m x 1.0 = 429.54m³
built-up area = 145.61m² / 429.54m³

Attic floor
11.27m x 12.92m = 145.61m² x 0.30m x 1.0 = 43.68m³
11.27m x 12.92m = 145.61m² x 2.50m x 0.33 = 120.13m³
built-up area = 145.61m² / 163.81m³

Total = 1022.90
Enclosed space: 1022.90 m³

Volume according to "calculation of enclosed space according to [DIN 277]"
Volume Rating Costs
(m³) (EUR/m³) (EUR)
1.0.0.0 Plot - not included
2.0.0.0 Preparation and development - not included
3.0.0.0 Building - Building construction residential house = 1022.90 x 310 = 317,099
4.0.0.0 Building - Technical equipment residential house = 1022.90 x 60 = 61,374
5.0.0.0 Outdoor facilities - not included
6.0.0.0 Furnishing and artworks - not included -
7.0.0.0 Other ancillary construction costs - not included -
Total = 378,473
Total costs 378,000 EUR.

2 full floors with converted roof:
Calculation of the enclosed space according to [DIN 277]
Length Width Area Height Factor Volume
(m) (m) (m²) (m) (m³)
Basement floor
11.00m x 11.25m = 123.75m² x 2.95m x 1.0 = 365.06m³
built-up area = 123.75m² / 365.06m³

Ground floor
11.00m x 11.25m = 123.75m² x 2.95m x 1.0 = 365.06m³
built-up area = 123.75m² / 365.06m³

Attic floor
11.00m x 11.25m = 123.75m² x 1.75m x 1.0 = 216.56m³
11.00m x 11.25m = 123.75m² x 4.15m x 0.50 = 256.47m³
built-up area = 123.75m² / 473.03m³

Total = 1203.16m³
Enclosed space: 1203.16m³

Volume according to "calculation of enclosed space according to [DIN 277]"
Volume Rating Costs
(m³) (EUR/m³) (EUR)
1.0.0.0 Plot - not included -
2.0.0.0 Preparation and development - not included -
3.0.0.0 Building - Building construction residential house = 1203.16 x 310 = 372,979 = 0.00 x 160 = 0
4.0.0.0 Building - Technical equipment residential house = 1203.16 x 60 = 72,190 0.00 = 0.00 x 35 = 0
5.0.0.0 Outdoor facilities - not included -
6.0.0.0 Furnishing and artworks - not included -
7.0.0.0 Other ancillary construction costs - not included -

Total = 445,169
Total costs 445,000 EUR.
 

reeneex

2016-11-03 21:54:19
  • #2
No one has an assessment on that?
 

ypg

2016-11-04 00:41:48
  • #3


Probably not.
This may be because most people don’t understand why emphasis is placed on Kfw40 when you want to save. If you want to save.

For explanation: There is hardly any more savings to be made in consumption, as from today’s form of the energy saving ordinance (i.e. kfw70) only moderate euro amounts can be saved monthly. The euros invested for 55 or even 40 hardly amortize within one or two generations.

Regards
 

Bieber0815

2016-11-04 06:20:11
  • #4
I don’t understand the first question. It’s stated there, isn’t it? You can save money if you build smaller, since estimates are always based first on the enclosed volume or the constructed living area. The size of the house is really a big lever in the costs!

You should ask the provider who created the initial cost estimates. Nobody here will be able to say.

In my opinion, prices are only comparable if the services are (almost) identical. That means you are comparing apples and oranges if you compare the costs of a KfW40+ villa with a pool to those of a 125 m² gable roof house according to the energy saving ordinance. But of course, you can see how much cheaper it is.

What this forum is quite good at: pointing the way based on a presented budget in which direction dreams may be allowed. In the end, though, you need concrete offers from builders or concrete cost estimates from architects.
 

reeneex

2016-11-04 09:30:26
  • #5
we had hoped to save money in the long term with the 40+ version on electricity, etc. With enough solar and battery, we wanted to be independent from the grid. That's why 40+
 

Legurit

2016-11-04 09:35:16
  • #6
I am of the opinion that prices always move in such a way that all subsidies, long-term potentials, green conscience, risk considerations, etc. are priced in, and in the end it only depends on the personal weighting of the individual factors and the willingness to take risks... meaning: it is relatively irrelevant what you do, as long as you feel comfortable with it. However, KFW40+ will probably perform worse in terms of TCO without the factor "green conscience" than the house built to the minimum requirements of the Energy Saving Ordinance.
 

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