Single-family house - 150 sqm - 1.5 stories - despair

Okay, I don't understand. I have offers available and know the rule of thumb €1500 per sqm. That would be €225,000, so why should that "never ever work"? ops:

Your budget will not be sufficient. What have you planned for the individual trades in addition to the house price? Especially for electrical, plumbing, and outdoor facilities, you can easily make big mistakes. How many euros per sqm have been considered for floor coverings? What have you planned for the kitchen?

What I am briefly writing is purely my opinion, which I have fortunately refined here in the forum "auf Vordermann" and which reflects the current experience of our planning (which of course absolutely deviates from a classic single-family house).

Here, calculations are often made with about 2 - 2.5k per sqm (without the secondary construction costs you mentioned). Architects cost money (which service phases do you want to commission or do you even already have one). Where are you building? I read that the kitchen is also included (everyone naturally has individual wishes), but the kitchen should still be calculated separately. The same applies to the equipment. Outdoor facilities cost a lot of money (for example, we calculate here with 110 € net per sqm). And and and and and...

What offers do you have? What do they include?

Your budget will not be sufficient. What have you planned for the individual trades in addition to the house price?
Especially with electrical, sanitary, and outdoor facilities, one can easily make big mistakes.
How many € per sqm are considered for floor coverings?
What have you planned for the kitchen?

House connection €3,790.35 (inquired by phone from the suppliers)
Additional foundation €0.00 (included in the contractor's offer)
Multi-service house entry €0.00 (included in the contractor's offer)
Contract review €250.00
Surveying costs €962.00 (inquired by phone)
Soil report €892.50 (already done)
Construction water and power €1,000.00
Construction €135,421.25 (offer from the contractor according to the drawing)
Building notification €60.00
Architect (design only) €1,000.00 (according to the contractor)
Statics and technical drawing €0.00 (included in the contractor's offer)
Energy consultant including BD test €714.00 (according to the contractor)
Windows, doors, stairs €31,826.55 (selected)
Electrical engineering €29,509.73 (KNX partly self-performed)
Building services/ sanitary €37,039.37 (ring trench collector with Nibe 1255-6, controlled residential ventilation with ZWR, BKA, underfloor heating, sanitary selected)
Outdoor facilities €12,429.00 (carport performed by oneself, driveway and terrace, lawn) -> only the essentials
Security €10,000.00
Furnishing including kitchen €17,205.05 (kitchen from Nolte, assembled in self-performance with a friend who is a kitchen installer)

Tiles €50 per sqm in bathrooms
Clinker €500/1000 bricks
Roof tiles are already selected and included in the price
Flooring €42/sqm (vinyl, self-installed)

Honor 2000 euros/sqm in Lower Saxony is also possible for a little less - from what one hears [Dazu kommen Baunebenkosten, Außenanlage, Carport] The water and electricity consumption during the construction phase, insurances [Erdarbeiten] [Bodenplatte dabei] What is included in the house connection costs How is the electrical equipment Etc.

Water and electricity consumption are allocated to the construction phase, insurances

See above.

Insurances

Builder's liability insurance €92.82
Construction all-risk insurance €249.90
Fire shell insurance €0.00 (included in the residential building insurance)

Residential building insurance, household contents insurance, legal protection insurance (including construction) are not listed because they are not "construction-specific."

Earthworks

Are carried out with the installation of the horizontal collector, approx. €3000 for the house, €1500 for the horizontal collector

Base slab included

[ATTACH alt="2019-10-04 20_42_40-StrokesPlus.png" type="full"]38660[/ATTACH]
[ATTACH alt="2019-10-04 20_42_29-StrokesPlus.png" type="full"]38661[/ATTACH]

What is included in the house connection costs

Telekom, water, electricity – we don’t need gas.

How is the electrical equipment

KNX according to our wishes, 12x LAN, 75 sockets, etc.

Painter and plasterer work is completely missing, right? That can also quickly be 50k and more. How about small things like window sills, etc.? Oh yes, we also have KNX and normally that increases the demands for lighting. How does it look here? That can also quickly add another 10k. In summary, there is only one thing to say - this won't work. Even with standard equipment, 100k is already missing...