Rough construction cost estimate single-family house

Yes, the cost breakdown, I have to agree with you especially 11ant, is of course complete nonsense. Planning the calculation down to the smallest detail does of course not work in this early planning phase. We overshot the mark or started wrongly. We just wanted to set a rough direction for ourselves whether we have to plan for 700k, 800k or 900k.

Actually, in principle (i.e. omitting "down to the smallest detail") it does work, it’s not "complete nonsense." That you started wrongly is correct, and I have explained that to you to some extent. Roughly speaking, you can calculate with 3k/sqm, as long as you are not building on rock or swamp. The house shown would therefore be within range. The slope of the property – assuming some uniformity – would expect about 1.0/1.1 m height difference within the house footprint, which is roughly square as in your example and okay, and foregoing a house-garage connection will pay off.

I would use the completed questionnaire at a later time,

You should then best post it in the opening post of the new thread, which you link here. once we have been to an architect or or planner of a construction company. [/QUOTE] No, not "or." You don’t go to a construction company "instead of," but "with" an (“own”) architect or other independent construction consultant. Do the "Module A" with the architect (see my house building schedule), after that you have a "preliminary design." With this you make a "setting of the switches" during the "dough resting phase" (which I can gladly do for you as well) to determine the more appropriate construction method in the specific individual case (here: stone or hybrid, because of the base floor). Afterwards, you have the architect at least plan the design in the determined building method (service phase 3) or commission him for the entire "Module B," also depending on the result of the inquiry round in the switch setting. On your plot, I see it leading to a residential basement planned "with the property," accordingly the above-ground house can be reduced in size.

You also discuss the energy efficiency level of the house and its stage of completion (for example, as an average earner according to the Building Energy Act, and depending on the extent of own work or individuality of the construction service description, rather a shell house or a raw construction, because remodeling and re-sampling is wasted money) with the architect or other independent construction consultant. Here is an example from your cost calculation: instead of "stairs," you must decide whether it should be a "standard stair à la carte of the general contractor" or a "sculpture stair" (which would mean awarding the contract to another stair builder). Also for "tiles" there are accordingly significant differences between "tiles in decoration according to the choice of the general contractor and in conventional formats" or "designer tiles" / "large format tiles" (analogously also applicable to facing bricks). Regarding the roof truss, especially your dining bay window can trigger a move into noble price regions.

We have built a similarly sized house. You should already expect 700,000-850,000 euros just for a house with 180 sqm of living space + basement. Even if you do a lot yourself, the materials also cost quite a bit. Additionally, you should always keep a buffer of 10% of the costs in reserve. How do you want to build it? With an architect? That also costs.

- For the shell construction, you can get by with significantly less (-60-100,000 euros).
- But you also have to budget for scaffolding.
- Interior plastering costs >18,000 euros if the basement is also plastered. It might fit if you also include the exterior painting work.
- Screed will be cheaper, about 4-5k euros.
- Development. Should then include drainage, building permit, surveying?
- Additional construction costs. Are earthworks meant? That is also very cheap with 20k euros.
- Heating + ventilation. The underfloor heating is still missing. That also costs 15,000 euros.
- Photovoltaics should work if you don’t take so many KWP. But not with inquiries from Enpal etc.
- Electrical. Is that enough for material costs? There isn’t much material included there.
- Sanitary. Also quite tight for three bathrooms. Sanitary includes water supply/drainage (all pipes) plus sanitary installations.
- Tiling alone will cost that much without materials.
- Front door might also cost more with two side panels. Also missing a canopy.
- Windows. You have cheap windows (no floor-to-ceiling and no sliding door) but I would also calculate with 10k euros plus if shutters are included.
- Interior doors. Should be a bit less (-2/3k) if expectations are not high.
- Garden/terrace. Can be done later. But will definitely be more expensive.
- Double garage. Will be considerably more expensive plus 15-20k.
- Interior painting. Where are the costs for wallpaper, paste etc.? I think minimum +5k.
There are certainly also the following additional costs
- Glazier. For showers etc.
- You have a basement bathroom. You need a lifting system +2k.
- Grounding system
- Baseboards
- Construction power costs about 4k as well.

Good luck.