New construction - request for planning assistance

Good day,

my wife and I no longer want to stay in the parental home; paying rent is not an option, as we currently have no rental costs.
If anything, we want to invest our money into something of our own -> We want to build.

Since neither of us are craftsmen and prefer to spend our time working in fields we are skilled at,
the professionals should take care of it; we will only lay laminate and wallpaper.

At the moment we have little equity, but our (independent) financial advisor believes we can build even without it since interest rates are very low - it would not make much difference to save for another 7 years and start with 33% equity - except that we would have to stay in the parental home that long.
We should also build solidly (massive construction), as this reduces costs overall. Since we are not in a hurry, we do not need a prefabricated house.

So we have decided to take on the whole thing as long as interest rates are this low, even if our equity is only for new electrical appliances, kitchen, moving, and reserves for car repairs etc.
-> We will finance the plot and house.
What kind of own contributions are possible?
Can one take time off during the house construction and help out,
or is one just in the way and better off going to work?

Enough about myself and the unpleasant topic of finances, now to the house itself.
Single-family house, 114 sqm. Requirements: minimal unnecessary frills, low-maintenance technology, and low heating costs -> affordable upkeep.

The carport is on the north side, the terrace with large window surfaces - to gain as much passive heat as possible - on the south side.

As KfW70:
Air-water heat pump from Fujitsu Waterstage
Approximate U-values:
Floor slab U-value: 0.20
-> 12 cm loose foamed lava fill covered <1200kg/m³
--> 25 cm reinforced concrete with 1% steel (DIN 12524)
---> 10 cm insulation Misapor
----> 6 cm cement screed

Exterior wall 0.18
-> 0.5 cm synthetic resin plaster
--> 14 cm thermal insulation
---> 24 cm Poroton T 14
----> 1 cm plaster mortar made of lime gypsum, gypsum, anhydrite, and lime anhydrite

Roof 0.19
Rafter share 12.50%
-> 2 cm clay roof tiles according to DIN 12524
--> 2 cm structural wood according to EN 12524
---> 0.02 cm diffusion-open underlay membrane
----> 22 cm structural wood according to EN 12524
-----> 0.05 cm polyethylene foil according to DIN 12524
------> 2.5 cm gypsum board according to DIN 12524

Between-rafter share 87.50%
-> 2 cm clay roof tiles according to DIN 12524
--> 2 cm structural wood according to EN 12524
---> 0.02 cm diffusion-open underlay membrane
----> 22 cm thermal insulation
-----> 0.05 cm polyethylene foil according to DIN 12524
------> 2.5 cm gypsum board according to DIN 12524

The windows have glass with approx. U-value 0.6, the overall value for glass and frame approx. 0.9 - 1.1.
The front door has approx. U-value 1.4.

When increasing the insulation from 14 to 16 cm, the U-value will probably drop from 0.18 to 0.16.

House dimensions: approx. 9.08 x 8.14
Knee wall with infill masonry: approx. 1.2 m
Knee wall without infill masonry: approx. 1.0 m
Roof pitch: 45°
Total living area: approx. 114 m²
Attic: approx. 37 m²


/optional for approx. 17,500 Euro
Additionally for KfW55:
- Improved exterior wall insulation to 0.16
- Instead of Fujitsu Waterstage a Stiebel Eltron LWZ 304 SOL
with controlled residential ventilation, heat recovery, cooling function
- For controlled residential ventilation filigree ceiling 22 cm instead of prefabricated ceiling 20 cm

/Desirable?
To eliminate further weak points:
- Additional under-rafter insulation
- Improved front door
- Preparation for photovoltaics, easy retrofit in X decades
....??

Included in the house price with fixed price guarantee are:
- Provision of construction electricity / construction water
- Painting of roof overhangs
- Insulated floor slab with Misapor
- Soil investigation report
- Boarding of attic, including retractable ladder

Exclusive costs:
- Plot
- Property transfer tax
- Notary
- House connections electricity, water, telephone
- Sewer connections
- Double carport
- Remaining floors, wallpaper, paint
- Outdoor facilities
- Upgrade to KfW55 by more exterior wall insulation and use of the LWZ 304

Phew... that’s it for now

I hope you write plenty of feedback and a discussion about my project will arise.

Thank you very much.

Hello Nutshell,
what exactly is supposed to be discussed?
About your financing, which we do not know, about the idea of building without equity and presumably based on your net income?
Or the DIN standards, rafter intervals, whether the house fits on the plot (how expensive was that again? And where is it located?) and if the floor area ratio fits?
You already know exactly who you are building with, you listed half of the construction description for us.
Do you even know what all of this means? Considering that you want to avoid unnecessary frills, your thread is pretty full of it.

Best regards

No rent payment and still no equity? That has never meant anything good. The reserves you have built up should have been formed by any sensible person alongside rent payments / repayments.

And just low interest rates alone are simply not enough; I wonder who ever drilled that into people's heads. Unless you want to repay a loan for the rest of your life, the repayment should also fit.
I always say, if you want to finance sensibly, plan for €500/month repayment (interest + principal) per(!) €100,000 loan amount. (Example: €250,000 loan == €1,250 repayment/month). Sure, it can also work with €700/month, but then the likelihood is high that you end up passing on the loan contract / debt as inheritance.
In my opinion, banks calculate way too little, following the motto: living hand to mouth. No reserves. If they calculated realistically, they would also grant fewer loans and therefore earn less commission. After the borrower has signed under the contract, it doesn’t matter to any advisor, whether from the bank or independent, what happens to the person or the family. If necessary, the house will just be seized, they don’t care.

Such considerations should always be viewed realistically(!) for oneself. And not at all costs.

Of course, everyone is free to do as they wish. This is just my opinion.

I can only agree with my predecessors... if you have lived with mom in recent years and have managed to accumulate no usable equity for the construction project, it will probably be difficult now to set aside significant amounts for it monthly. How exactly have you planned this for the next 10-25 years? Including a new car, offspring, one less income, etc.... everything life throws at you in terms of surprises and normalities? Not to forget that a house also has immense ongoing costs and requires constant reserves to avoid planning for the next investment backlog already (I am thinking of cost drivers in 10-20 years like new paint, heating system, etc.) ks

For example, we took over the complete renovation work (inkl. Teppich sowie Parkett verlegen). We did not dare to tackle the tiling because the area was very large. Only our utility room we tiled ourselves. Furthermore, our garage was built (nach einem Jahr) by ourselves.