ᐅ Construction of an approximately 190 sqm urban villa in Hesse (Wetterau district)

Created on: 10 Jul 2022 17:36
D
Dribbdebach
Dear Homebuilding Community,

First of all, thank you very much for the countless tips and suggestions from all of you. I have been visiting this forum for many years and have always greatly benefited from it.

Accordingly, I would like to give something back by sharing our building project here. However, this is not entirely selfless—I welcome advice and recommendations.

For about 10 years, I have been searching for a house and have viewed many existing properties. Building was initially not an option, as plots were either unavailable or far too expensive. So far, I haven’t found the ideal house, but nearly 10 years ago I bought my first condominium and then a second one two years ago. Both apartments are now rented out, currently almost breaking even, and in about a year they will start generating income.

Fortunately, we have now purchased a plot in a new development area and, despite the challenging situation, want to fulfill the dream of owning our own house.

A few details about us:
  • 2 adults (40 years / 38 years), two children (elementary school age)
  • Net income including child benefits about 8000 euros
  • Rental income of approximately 1800 euros (currently nearly cost-neutral, from next year about 400 euros monthly profit, significantly more in the medium term as loans are gradually paid off)
  • Budget 850,000 euros (financing for the house construction is secured)
  • Land purchase costs including additional fees about 280,000 euros, already acquired
  • The apartments only make sense tax-wise when owned together and are not intended for sale. The budget could probably be increased slightly if necessary.


About the house:
  • KfW55 standard is sufficient for us and is also being offered
  • Urban villa on a slab foundation with porch, heat pump, photovoltaic system
  • Possibly with a small bay window at the front door and on the garden side
  • Ground floor with living room, open kitchen, utility room, study, guest toilet/shower
  • Upper floor with 2 children’s rooms, master bedroom, 2 bathrooms, guest room
  • Ceiling height 2.80 m (9 ft 2 in), electric roller shutters
  • Detached double garage


Regarding the budget for the house:
About 570,000 euros remain, we are estimating around 60,000 euros for additional construction-related costs.
Outdoor work will be done gradually by ourselves, a garage could also be postponed.
We therefore need a builder who can construct a house for about 470,000 euros. This is quite ambitious for the desired size. We have had many discussions at model homes, and most providers come in at a minimum of 500,000 euros.

Offer 1:
We have chosen a small regional builder who would construct a shell house in solid construction with Liapor (lightweight concrete). The price is fair for the quality offered and would be sufficient for us. However, we would only have a fixed price for the shell house. The remaining trades would be supervised by this builder but carried out by partner companies, and I believe fixed price guarantees here are unrealistic. Ideally, we would stay within budget, but the buffer would be very tight, and the outdoor areas and garage might initially be at risk or very minimal.
Here is my first question for you: The builder basically suits us, but we are unsure whether it is wise to forgo fixed prices due to war, inflation, and material shortages. While I see some chances for stable or even slightly lower prices due to a slowdown in construction orders, the inflation risk from the energy crisis might still dominate for now. Would you currently take such a risk?
A house potentially costing 1 million euros due to cost increases is really out of budget and, combined with rising interest rates, could become a long-term burden. It wouldn’t ruin us, but we would likely have to sell the (really nice) condominiums then.

Offer 2:
The alternative: A very large provider from a parent company that almost everyone here probably knows. Premium within the group, but overall very much focused on good value for money. Timber frame construction—not our favorite since we prefer solid construction—but based on information from this forum, I would probably be satisfied with this construction method in the end.
We received a good price offer there, close to 400,000 euros. After selecting many extras and special requests, I still ended up at about 450,000 euros. Not all line items are comparable with the first offer, but some things are included here that are not yet priced in the first offer.
With additional construction costs, outdoor work, and a double garage, we are still within the budget and could even spend around 20,000 euros more on selections.
There are positive reviews of this provider but also some very critical comments. Given the large number of houses they build annually, the number of critics may be appropriate in absolute terms, but you could certainly be one of them.
My further questions for you: How do you assess the risk of being let down by such a large provider? Would you choose a builder with a large budget who does not necessarily have a reputation for delivering houses to the highest standard? I do not intend to sell the house again, but future property valuation plays a role in refinancing at follow-up financing. If the house ever needs or should be sold, some buyers might be put off by the construction method or the original general contractor. Has anyone built with this provider or lives in one of their houses?

Floor plan designs are quite advanced and have been optimized multiple times. The development area is ready, and as financing is secured, construction should start soon. The second offer will expire soon, so the main decision now is basically for or against the second offer. With the first offer, it would still be possible to request new comparison offers. If we choose the second provider, we need to decide soon.

Thank you very much for any tips and recommendations. I am happy to provide further information.
Nida35a13 Jul 2022 11:52
Our exterior walls are made of 42cm (17 inches) Liaplan, and the interior walls are 11cm (4.3 inches) sand-lime brick (calcium silicate brick); an alternative would have been 17cm (6.7 inches) Liaplan.
Our technical room is located between the guest WC and the bathroom, with no walls adjoining living or sleeping areas.
We cannot hear anything from the heat pump.
We installed high-quality doors, as the standard provided by the general contractor was not sufficient for us.
We have contact details for all regional subcontractors. After moving in, we had a water softening system and some electrical additions installed.
AxelH.13 Jul 2022 11:56
Dribbdebach schrieb:

Oberhessengas offers ground source heat pumps for the new development with no upfront cost, paid through monthly installments. Could this be an option?

Geothermal energy is definitely recommended. And the heat pump—at least our model from Nibe—is whisper quiet.
What about controlled mechanical ventilation? Did I miss something about that?
N
Neubau2022
13 Jul 2022 12:28
Dribbdebach schrieb:

Thanks for the tip!
In the development area, indoor air-to-water heat pumps are unfortunately mandatory.
We now want to choose the first local supplier. My wife is set on a house made of stone, and based on recent posts here about regional suppliers, we fully agree. Local specialists usually deliver very good results and are probably easier to reach for follow-up questions.

Regarding your point:
With solid construction using Liapor in a monolithic form, installing an indoor air-to-water heat pump should work, right?
Next to the utility room there are the toilet and kitchen. Above the utility room on the upper floor is the bathroom.

I also found the noise from indoor heat pumps shocking in model homes. But even in timber frame houses, it was unobtrusive with the door closed. Of course, you don’t sit quietly in the next room for hours.

Do you see any problems with noise and vibrations coming through Liapor walls?

Oberhessengas offers ground source heat pumps for the new development area with no upfront costs through monthly installments. Would that be an alternative? Or should we consider the higher costs of a ground source heat pump despite current excavation prices?
Does it actually mean less noise in the utility room?

With a ground source heat pump, you don’t have that ugly unit that causes noise. There are two options for ground source heat pumps. Either you use deep drilling (but then the area must not be in a water protection zone) or you use surface or trench collectors. However, the latter requires a larger plot of land. We had to choose the second option. Keep in mind that heat pumps are currently in short supply. We ordered ours in February, and there is still no delivery date. So place your order early.
D
Dribbdebach
13 Jul 2022 13:02
Nida35a schrieb:

Our exterior walls are made of 42cm (16.5 inches) Liaplan, and the interior walls of 11cm (4.3 inches) sand-lime brick (sand-lime brick); the alternative would have been 17cm (6.7 inches) Liaplan.
Our technical room is located between the guest toilet and the bathroom, with no walls adjacent to living or bedrooms.
We don’t hear anything from the heat pump.
We have high-quality doors; the standard provided by the general contractor was not enough for us.
We have contact details for all the local subcontractors, and after moving in, we had a descaling system and some electrical additions installed.

Great, thanks. We are currently planning 49.5cm (19.5 inches) Liapor for exterior walls and 17.5cm (6.9 inches) or 10cm (3.9 inches) Liapor for interior walls depending on the wall.
Then the heat pump might actually be fine after all.
There will certainly be smaller follow-up jobs from time to time, and then you already have trusted companies on hand.
AxelH. schrieb:

Geothermal energy is definitely recommended. And the heat pump—at least our Nibe model—is whisper quiet.
By the way, what about the controlled mechanical ventilation system? Did I miss something?

I will now request a quote for the “flat rate” and compare it with the cost of immediate payment for the geothermal system. Thanks!

I had once considered controlled mechanical ventilation as optional, but everything I have read so far suggests it is something you don’t want to skip. Even with a solid construction and KFW 55 standard. For us, it would have been about 12,000 euros saved by leaving it out. Expensive luxury or essential? The benefits of heat exchange between incoming and outgoing air would probably be less crucial with geothermal, I think?
Neubau2022 schrieb:

With the geothermal heat pump, you don’t have the noisy, bulky unit that causes sound disturbances. There are two options for geothermal heat pumps: either deep drilling (but the area must not be a protected water resource zone) or you use surface or trench collectors. For the latter, you need a larger plot. We had to choose the second option. However, keep in mind that heat pumps are currently in short supply. We ordered ours in February, and there is still no delivery date. So make sure to order early.


That sounds great. Even if it’s just for operating the washing machine in the utility room. Overall, I’m a big supporter of reducing noise emissions, so that sounds ideal.
Deep drilling should be possible, but I need to clarify that. Our plot is about 750 square meters (8,070 square feet), so it should also be sufficient without deep drilling. In the package from Oberhessengas, they mention “geo collectors” installed underground. I’ll schedule a consultation and will know more about possible installment payment options then.
Yes, I am aware of the shortage. Hopefully, Oberhessengas, as a large provider, will manage. Our regional general contractor would surely order in time. Incidentally, they are currently building their houses in 9 months. I find that hard to believe, but then moving in by next summer is planned. Christmas 2023 also works for me, as we have good rent-free transitional arrangements locally.

Thanks to everyone for the valuable advice! Your guidance and experience make decision-making much easier!
AxelH.13 Jul 2022 13:17
Dribbdebach schrieb:

I once considered controlled residential ventilation as optional – but everything I’ve read so far suggests you really don’t want to do without it. Even with solid construction and KFW 55 standard. For us, it would have meant “saving” around 12,000 euros. Expensive luxury or a must-have? I think the benefits of heat exchange between supply and exhaust air would be less critical when using geothermal energy?
Well, let’s put it this way: controlled residential ventilation is a very controversial topic here. I can only speak from my own experience. And that says: it’s a must-have. The tighter the house, the greater the need for air exchange, especially during seasons when the balcony door isn’t always open. And I guess nobody wants to walk through the whole house twice a day just to ventilate. Not to mention the air you find in your beloved home after a three-week vacation without controlled ventilation.
Heat recovery is always an issue, no matter how the house is heated. The heat should stay inside. And it doesn’t matter how it was generated.
D
Dribbdebach
13 Jul 2022 13:21
AxelH. schrieb:

Well, let’s put it this way: the topic of mechanical ventilation with heat recovery is very controversial here. I can only share my own experience, which says it’s a must-have. The tighter the building envelope, the greater the need for air exchange—especially during seasons when the balcony door isn’t open all the time. And I don’t think anyone likes to walk through the entire house twice a day just to air it out. Not to mention the air quality you face after returning from a three-week vacation without mechanical ventilation.
Heat recovery is always an issue, no matter how I heat the house. The heat should stay inside. And it doesn’t matter how it was generated.

Yes, I completely agree with you.
Just the potential risk of mold due to tight construction is, for me, a strong reason not to skip mechanical ventilation with heat recovery.
Thanks for thinking along!

I’ll send you some floor plans soon. At the moment, I don’t have any current high-quality ones since there is still some sketching involved, and discussing outdated plans doesn’t make much sense. There’s definitely still room for optimization.

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