Single-family house/150m²/Standard/NRW - Cost budget - what do you estimate?

Hello everyone,

our project is probably a relatively typical one:
- Construction of a 150 m² single-family house with an attached garage and without basement according to the energy saving ordinance standard (but probably towards KFW 55) on an already existing plot (550m²) in a rural area (NRW, postal code 52***)
- 1.5 floors with attic (used as storage); 2 dormers on the upper floor; two concrete staircases; concrete terrace; about 19 windows; five floor-to-ceiling windows in the dining/living area; 8 doors + one terrace door; exterior plaster in thermal insulation composite system; fireplace
- it should not be built through a general contractor, but by self-managed tendering / coordination
- I would describe the execution as "standard" to clarify this:
- no smart home, only electric roller shutter boxes planned
- flooring due to underfloor heating about 90% porcelain stoneware (planned material costs 10 - 15 €/ m²)
- front door may come from the hardware store (RC2 standard, U-value of 90) and cost under 1,000 €

- Energy concept/heating system is still open and no final expertise available yet: We are currently leaning more towards a heat pump with underfloor heating, ventilation system in combination with a photovoltaic system
- Except for typical interior work, the entire house will actually be built by external services (possibly electrical work and partially tiling will be done by acquaintances)

> Ultimately, I am currently still asking myself (before completion of the tender and building permit) how high the construction budget should be set <

- of course this project has already been financially estimated, but I would like to check it again against the gut feeling of others here – the construction should not cost more than 320 k€
- positively affecting the budget: the architectural service is provided by a relative; soil excavation does not have to be disposed of but is stored next door; there are craftsmen in the circle of acquaintances with whom there has been long-term cooperation (e.g. heating + sanitation) or the architect also knows a network

Sketches of exterior views front / back

Thank you very much for your advice / opinion.

Best regards
PetitJeune

150 m² single-family house with attached garage and no basement [..] beyond 320 k€ the construction should not cost

150*2000€ + 20,000 euros for the garage and you reach your 320,000€. But all incidental construction costs, garden, kitchen, surveying and a buffer are still missing. Do you have a separate budget for that? I couldn't read that out.

I also consider photovoltaic as an additional cost driver, which initially has no place in 320,000€.

Please read this thread on and make your own table.

Excavated soil does not need to be disposed of, but is stored next door;

Stored forever?

What is all done in EL? What does the [Bodengutachten] say? How much do the trades want to accommodate you?

But it doesn’t matter, because with so few details there simply is no realistic estimate.

I have built similarly to how you imagine it now, only that I paid 10k for the architect and construction coordination.

Tiles for 10 euros and the front door from the hardware store. Yeah, right. You can replace both completely after 5 years.

We ordered a door for 1200 euros online for our workshop. It is higher quality than the one from the hardware store. But that thing as a front door – never! Squeaks, slightly crooked, only closes moderately tight, gets scratched very easily. Honestly, I’d rather take the basic equipment from Danwood than install such junk in my dream house.

Thanks for the feedback so far. I didn’t want to get completely bogged down in the details (hence the sketches). I also think that even with details, an accurate estimate from a distance is more than difficult. I just find a gut feeling interesting. If someone now tells me that it’s over 400 kEUR, then I have to talk to the architect again, but our estimate didn’t seem completely off.

Tiles for 10 euros and the front door from the hardware store. Sure. You can completely replace both after 5 years.

We ordered a door for 1200 euros on the internet for our workshop. It is higher quality than the one from the hardware store. But that thing as a front door – never! Squeaks, slightly crooked, closes only moderately tight, gets scratches very easily. Seriously, I’d rather have the basic equipment from Danwood than install such crap in my dream house.

- there is no right or wrong here, everyone chooses a different strategy: My dream house is only a dream house if I don’t have to work 24/7 for it and if I can still afford other consumption / luxury. In the end, it is a door for a side entrance. But if you happen to know the model, then let me know your experience with it. I’m happy to be proven wrong: If the general tone here is: front door made of steel + from OBI + Made in China... makes no sense and for 500 - 1,000 € you can demonstrably get better quality, then I’m happy to reconsider. Price/performance just has to be right in the end, but we agree that this does not have to always be guaranteed with higher-priced products.

Stored forever?

- is simply provided for a local farmer so that he can fill soil.