I believe I have never written down my construction costs here and will now make up for that: Completion of the semi-detached house in August 2021, start of construction (BP and solid wood shell) in October 2020. It is a semi-detached house with 2 residential units totaling approximately 135m². The construction was carried out according to KfW40+ standard + on top passive house. All invoices combined (including architect, realtor, notary costs, etc.) amounted to approximately 345K. However, I do not have to pay 60K of that kindly (KfW 40+ subsidy) and have directly received back a good 30K (BAfA, Progress NRW among others). Additionally, I have a good 10K tax saving over the next 4 years through the special depreciation of the upper residential unit (rental apartment).
In return, the house has received a few amenities. Controlled indoor ventilation with heat recovery, brine-water heat pump, photovoltaics + battery, "a bit of smart home." Almost all windows are equipped with external blinds. Aluminum front doors with motor locks, partly with video door intercom system. Cistern and domestic water system (for garden and toilet, optionally also for washing machine). Floor-level all-glass showers with rain shower, in my case a freestanding bathtub, among others.
The above-mentioned 345K includes all costs including incidental purchase costs and additional construction costs except my kitchen and the outdoor facilities. I paid for the kitchen "as is," the outdoor facilities have arisen/are arising gradually and I paid am paying them from ongoing income. However, thanks to own work, these will only be about 12K, of which almost half (terrace, access path, parking space) are already completed. From this week on, the remaining paving work, the double rod mat fence, about 25 tons of topsoil, hedges, trees, etc. will be done.
The above-mentioned price of 345K was only possible due to a lot of own work, we once estimated it at about 50K for the entire house, so proportionally 25K for me. The plot will cost me about 120K in 8 years (340€ per m², notarized fixed). Additionally, I have been paying 178€ monthly leasehold since the purchase contract over 2 years ago.
My interest rates: KfW 0.95 over 20 years (but I will finish after 15), the other loan was at 1.1