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
G
Gerddieter13 Sep 2021 21:22I think your estimate of around ±80 is quite accurate, with a bit more depending on the fittings.
I just had a conversation with the general contractor; the entire basement is 64 m² (689 sq ft), no bathroom, toilet, or similar, of which 24 m² (258 sq ft) has underfloor heating and parquet flooring.... 70-80 thousand.
GD
I just had a conversation with the general contractor; the entire basement is 64 m² (689 sq ft), no bathroom, toilet, or similar, of which 24 m² (258 sq ft) has underfloor heating and parquet flooring.... 70-80 thousand.
GD
hanse987 schrieb:
With 2.2m (7.2 ft), you are already below the minimum height requirement in some regional building codes or right at the lowest limit for habitable rooms. Where? I know the minimum height requirement is 2.30m (7.5 ft).
2.20m (7.2 ft) is still considered a basement – even with a light well, carpet, and wallpaper.
hanse987 schrieb:
Depending on the sport you want to practice, 2.2m (7.2 ft) can already be too low. That rules out quite a few activities. But many homeowners assume they will always do the same thing for 30 years. Having a dumbbell in your hand for some bicep curls or doing a bit of cardio by jumping and doing jumping jacks will already get quite cramped 😉
I understand this as a clear room height of 2.2 m (7 ft 3 in) without floor buildup, which means it will be about 2.1 m (6 ft 11 in) later on and thus purely a utility cellar. A finished basement usually starts at around 2.3 m (7 ft 7 in) (building regulations). The price itself seems quite reasonable to me, but your construction supervisor should be able to tell you what is currently estimated for finishing in your area.
Best regards
Best regards
Hello! First of all, thank you very much for your many comments. There were really a lot of points that made me think a bit more. Last night, I reviewed the Bavarian Building Code. According to it, the office/computer room would be classified as a living space, which under BayBo requires a minimum ceiling height of 2.4m (7.9 ft), a window size of at least 1/8 of the net floor area, and a second emergency exit. That, of course, brings quite different challenges. I would be interested to know how others have solved the issue of the second escape route. Is there a separate basement staircase?
Besides that, what struck me most was the interpretation that rooms are considered living spaces if they are "suitable in their condition" for this purpose. For me, this means that even a room with underfloor heating can be converted into a living space with little effort.
However, if I state in the building permit/planning permission application that the room is for storage or a basement room, but then use it differently, this would violate the building permit and be considered an unauthorized building. Of course, where there is no complainant, there is no problem... but still.
Besides that, what struck me most was the interpretation that rooms are considered living spaces if they are "suitable in their condition" for this purpose. For me, this means that even a room with underfloor heating can be converted into a living space with little effort.
However, if I state in the building permit/planning permission application that the room is for storage or a basement room, but then use it differently, this would violate the building permit and be considered an unauthorized building. Of course, where there is no complainant, there is no problem... but still.
ypg schrieb:I have a cross trainer, a treadmill, a power rack, a cable tower, and free weights. That should be enough for the next 30 years – even with a lower ceiling height 😉
A lot is excluded there. But many homeowners think they will do the same workout for 30 years. Dumbbell in hand and a few bicep exercises or some cardio jumping jacks will get pretty tight 😉
G
GeradeSchräg14 Sep 2021 10:00A friend had his basement built about a year ago. Approximately 65-70m² (700-750 sq ft) of usable basement space without light wells and no underfloor heating. Floor height at 2.2m (7 ft 3 in) above the subfloor. Built to energy-saving regulation standards with about 80cm (2 ft 7 in) above ground level. The cost was around 70,000 without earthworks.
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