For me, it's first about rough numbers for what everything will cost. The buffer doesn't matter at first, since the shell construction, earthworks, and most of the interior work are done by ourselves.
There will still be enough deducted from the finances ;)
What do you think, roughly how much will a house with a basement cost? It should be at a mid to upper standard.
On the one hand - I see it similar to Doc and nordanney - a basement will be difficult with this sum.
The price depends on the type of use and finishing (utility basement or living basement).
I seem to remember that for a living basement around 30,000 EUR are due (correct me if I'm wrong). But it can also get more expensive quickly if your plot conditions require a "white tank" (waterproof basement).
I wouldn't take the matter of the buffer too lightly. Especially since you aim for a mid to upper standard. Many construction companies set limits - e.g. tiles up to 30 euros. If these cost more (upscale equipment), several thousand euros can quickly disappear unplanned.
Regarding the
own work, the following should be noted:
You only save the "personnel costs" (manpower). Materials still have to be paid for.
Also, you have to see if you can manage a lot of own work
in terms of time and
physical effort. Especially if you are "not a professional," you can easily misjudge this. In addition, the people doing the own work must be free every weekend/evening/etc. and motivated to spend a few hours on the construction site – over weeks/months.
Two examples:
- We did the painting work ourselves. My father (older generation) has a lot of experience in painting. Myself, my wife, and my mother (as far as she could help) I would rather call rookies (with a bit of experience). Still, I was convinced that we would finish everything in 2 – at most 3 weeks. Well – the preparatory work alone took almost a week. In the end, it was a good 4 weeks (rather 5), during which we didn’t take it easy (there in the morning, back late in the evening, famous cut sandwiches for lunch).
After the phase of own work, my father looked really bad. We were seriously worried about letting him drive home alone (600 km). On the second to last day, we took the house key away from him so he could finally take some rest.
- Initially, we planned to do part of the interior finishing ourselves. Gypsum boards were to be installed on the ceiling of our upper floor. Luckily, we gave up on this plan. How were two of us (father and I as laymen) supposed to screw a 2.5 m x 1.5 m gypsum board overhead?
Last but not least:
If you are still tenants and carry out "time-consuming own work," you still pay interest on your loan. This double burden must be borne. The longer the own work takes, the longer the financial double burden lasts. Here one should consider whether it might be sensible to outsource a trade (and thus finish quickly) or do it yourself. Also – if your own work takes longer than planned, you might hold up other trades that cannot continue = additional delay.