Hello Forum,
We are currently planning a basement for our single-family home. In addition to the building services room and a laundry room (washing machine + dryer), there will also be a gym and a study.
The four rooms will cover an area of about 65sqm (700 sq ft). The ground is suitable for this (from approximately 2.5m (8 feet) of medium-density gravel layer according to soil report – load class 2 according to waterproof concrete guidelines). The basement will have perimeter insulation (exterior walls, floor slab, basement ceiling) – the design is currently based on KfW 40 standards, which require thicker insulation according to advice from the forum 😉 The study and gym will have underfloor heating. The study will also have a light well. The gym and laundry room will have light shafts. The building services room will have no windows. The floor will be continuously laid with anhydrite screed, followed by a floor covering. Electrical installations will be surface-mounted on the walls.
The additional construction costs (especially setting out the building grid and excavation of the foundation pit) are not included in the costs. I am currently budgeting about €1250 per sqm (approximately $130 per sq ft), which is about €81,000 for the basement. However, everyone looks at this price as if it were a car and says that €35,000 more than enough? What is your assessment?
Best regards,
Andy
We are currently planning a basement for our single-family home. In addition to the building services room and a laundry room (washing machine + dryer), there will also be a gym and a study.
The four rooms will cover an area of about 65sqm (700 sq ft). The ground is suitable for this (from approximately 2.5m (8 feet) of medium-density gravel layer according to soil report – load class 2 according to waterproof concrete guidelines). The basement will have perimeter insulation (exterior walls, floor slab, basement ceiling) – the design is currently based on KfW 40 standards, which require thicker insulation according to advice from the forum 😉 The study and gym will have underfloor heating. The study will also have a light well. The gym and laundry room will have light shafts. The building services room will have no windows. The floor will be continuously laid with anhydrite screed, followed by a floor covering. Electrical installations will be surface-mounted on the walls.
The additional construction costs (especially setting out the building grid and excavation of the foundation pit) are not included in the costs. I am currently budgeting about €1250 per sqm (approximately $130 per sq ft), which is about €81,000 for the basement. However, everyone looks at this price as if it were a car and says that €35,000 more than enough? What is your assessment?
Best regards,
Andy
Scout schrieb:
What do you think is missing from a square meter built above ground? So why should the underground construction, which is generally more expensive than above-ground construction (among other things due to safety measures, waterproofing, extensive reinforced concrete instead of cheaper masonry, excavated soil disposal), be cheaper? Because of the slightly missing exterior plaster and surface-mounted installations? By the way, simple windows cost about the same as masonry. The costs for excavation of the foundation pit, etc., are explicitly not included in these figures. For me, that falls under additional building costs, which I have planned separately with roughly the same amount. This is really only about installing a waterproof basement into the ground.
H
Hausbautraum2013 Sep 2021 09:06Andi3579 schrieb:
I’ve read that too, but I just can’t make the numbers add up. For our basement, construction costs would be around 162,000 EUR. Could someone maybe explain where those costs are supposed to come from? Are wet rooms, etc. being included in the calculation?Our hobby room in the basement was significantly cheaper than the average living space elsewhere. I also explain it by the absence of a bathroom and similar factors.
However, the basement price was still within your expected budget and nowhere near 35,000...
But even then, you’re only paying about half the cost compared to building above ground. Sure, you avoid having the two most expensive rooms of a house down there (kitchen and bathroom), but still: with a KfW-40 building envelope, partial underfloor heating, light wells, screed, floor covering, and expensive reinforced concrete, 1250 per m2 (square meter) is really the absolute minimum.
There have already been discussions about similarly sized waterproof residential basements.
https://www.hausbau-forum.de/threads/kalkulation-fuer-keller-wohnkeller-realistisch.26521/
https://www.hausbau-forum.de/threads/wohnkeller-ca-80-qm-wie-teuer.30751/
However, these posts are 3 1/2 years and 2 1/2 years old, so you can expect to add an additional 15 to 20% to those figures for today’s costs.
https://www.hausbau-forum.de/threads/kalkulation-fuer-keller-wohnkeller-realistisch.26521/
https://www.hausbau-forum.de/threads/wohnkeller-ca-80-qm-wie-teuer.30751/
However, these posts are 3 1/2 years and 2 1/2 years old, so you can expect to add an additional 15 to 20% to those figures for today’s costs.
Z
Zenjamino13 Sep 2021 10:55So, our basement cost just under 100,000 (finished basement). It has 20 cm (8 inches) of perimeter insulation on the outside, a guest bathroom, a hallway, and two rooms each planned as living space of 14 m² (150 ft²). This adds up to a total of 40 m² (430 ft²) of living area. Since it is a prefabricated house, I can’t break down the costs exactly—for example, the screed was already included in the price, as well as the electrical and plumbing installations.
But maybe this gives you a rough idea. By the way, the total area is about 60 m² (645 ft²).
But maybe this gives you a rough idea. By the way, the total area is about 60 m² (645 ft²).
Our basement is also offered at approximately 100k. It is a waterproof basement with two living rooms, a bathroom, hallway, utility room, and storage. The 100k only covers the basement construction costs; no fixtures (underfloor heating, flooring, sanitary equipment) are included. There are 51.89 square meters (559 sq ft) of living space and 28.86 square meters (311 sq ft) of usable area.
The offer includes the crane for the house installation, portable toilet for the entire construction period, concrete work, structural engineering, surveying, one light well, window openings, 20 cm (8 inches) insulation at the bottom and sides, as well as plastering and smoothing.
We are building about 30 km (18.6 miles) from Munich. The comparable offers were similar in price.
The offer includes the crane for the house installation, portable toilet for the entire construction period, concrete work, structural engineering, surveying, one light well, window openings, 20 cm (8 inches) insulation at the bottom and sides, as well as plastering and smoothing.
We are building about 30 km (18.6 miles) from Munich. The comparable offers were similar in price.
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