ᐅ Construction Report Single-Family Home €1200 per m²

Created on: 14 Jun 2020 12:05
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hegi___
Hello everyone,

This is the construction report following an earlier thread on floor plan design.

Planned are:
618 m² (6650 sq ft) plot of land
150 m² (1615 sq ft) living space
50 m² (540 sq ft) double garage
Air-to-water heat pump with underfloor and wall heating
Zehnder ventilation system
Exterior blinds in the living room, kitchen, and gallery. Windows anthracite on both inside and outside
Smart home wireless Homematic IP
Planned budget: €300,000 including land and ancillary costs + €30,000 reserve
Plus €12,500 net for a 9.6 kWp photovoltaic system financed separately

Only small regional companies recommended by other builders are being considered.

So far, the following trades have been contracted:

Earthworks: €20,000
Shell construction: €73,000 + €1,000 for the porch above the front door, Wienerberger Poroton T9
Roof: €19,000 + €1,500 scaffolding
Electrical work: €11,000 excluding chiseling work
Window materials: 17 Salamander triple-glazed units + Beck & Heun roller shutters + 5 Selt exterior blinds = €16,000

Quotes received for:
Plastering without decorative finish: €21,000
Bathroom ceramics Villeroy & Boch: €3,000 from Reuter Bathroom Shop
Interior doors Herholz: €2,600
Hörmann front door + garage door: €3,000
Building services materials from the internet: €10,000
Zehnder ventilation unit ComfoAir Q350 TR enthalpy heat exchanger including materials: €4,000 from Selfio
Nobilia kitchen furniture: €5,500, Bosch Series 4 kitchen appliances from Für Uns Shop with 50% discount for €3,500

Modern white villa with dark pitched roof, carport, two cars and front garden.

3D visualization of a modern white house with grey roof, garden and driveway.


Floor plan of a house with kitchen, office, hallway and WC as well as color-coded wiring.


Floor plan of a house with bedroom, child 1, child 2, dressing room, hallway, bathroom and stairs.


Architectural plan: two-story house with floor plans, sections and elevations.


Architectural plan of a house with front, rear, north and south views including measurements.


Construction cost breakdown with land, interim and building costs as well as own work.
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daniel1985ffo
16 Feb 2021 08:42
Mine has been running since 04.02.2021.
I just find the humming sound a bit unusual.
However, it could also be related to the temperatures. We had about -16 to -19 degrees Celsius (3 to -2 degrees Fahrenheit) overnight all weekend. At those times, I found it somewhat loud.
During the defrost cycle, you even get the impression it might burn out because of the steam 😉
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hegi___
16 Feb 2021 10:14
daniel1985ffo schrieb:

You definitely cannot meet the required temperatures for screed drying with just a heat pump. We also have a heat pump from Alpha Innotec.

Additionally, a mobile boiler was set up and connected to the heating system for screed drying, which supplied an extra 21 kW.

It ran for 6 weeks. With only the heat pump, we wouldn’t have reached the necessary temperatures.

Regarding mounting a heat pump on the house wall: every plumbing company advised us against it because of the humming noise.

Ours is installed on a concrete base 50 centimeters (20 inches) in front of the house, and even there the humming at full load is enough for me.


That must have resulted in a substantial electricity bill?

Generally, you don’t need to run the system at 55°C (131°F) supply temperature if normal operation is around 30–35°C (86–95°F) supply temperature.

So far, I haven’t noticed any disturbing humming. Of course, we haven’t moved in yet. But I would say it always depends on the specific case:
  • Size of the heat pump: it is often oversized unnecessarily anyway
  • Model: newer ones are quieter than older models
  • Vibration isolation of the heat pump
  • Vibration isolation of the piping
  • Vibration isolation inside the building
  • Installation location and acoustic conditions

With my Geisha unit, to be honest, I can’t really tell if it’s running or not. I have to climb onto the garage roof and listen carefully.

From my professional experience, thermal and acoustic isolation of pipes is usually not high on installers’ priority list...

Despite the advantages during initial heating, I would never switch to gas, because a well-designed and self-installed heat pump is simply cheaper overall.
I can always produce my own electricity... with gas, that’s much harder.
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daniel1985ffo
16 Feb 2021 10:26
Electricity costs 1600 euros.
The latest model from Alpha Innotec, which is supposedly the quietest available.
The heat pump and all other components were installed with rubber mounts, etc., according to the manufacturer’s instructions.
The installation site is 50 centimeters (20 inches) away from the house, directly in front of the utility room.

The humming noise can only be heard when I stand in front of the house or next to the heat pump. On the other sides of the building or inside the house, it is not audible.

I think it is simply due to the -18 degrees Celsius (0°F) we have had for a few days now.

During the day, I hardly hear it at all.
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hegi___
1 Mar 2021 14:48
Currently, we have five dehumidifiers running for two weeks. The rental cost is 50€ per day plus electricity.

What is your opinion—does everything really need to be 100 percent dry before painting? There are still some damp spots on the interior walls and around the lintel area.

The electricity costs for the heat pump so far amount to only 350€ according to the internal meter. Currently, it’s about 5€ per day at a room temperature of 35°C (95°F).

Unfinished renovation room with two windows, loose cables, and plaster work on ceiling and walls.


Unplastered interior wall with plaster patches, visible corner, two holes at bottom left.


Empty renovation room with walls full of plaster patches and round holes.
Winniefred1 Mar 2021 14:56
What kind of paint should be used? I would only paint in areas that are dry. That way, you can at least get started. Otherwise... it’s better to wait a few more days now than to deal with peeling paint and mold later.
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Tim2020
12 Mar 2021 16:28
We have a buzzing too. At first, I thought it might be my ears. We used to live on a busy street. Now we live in an area at the edge of fields, where it is completely quiet.

The construction manager has visited and said that, although his hearing isn't as good anymore because of his work in construction, he can hear the noise as well. However, he can’t explain where it’s coming from and says it’s still within a normal range.

The noise can be heard at night (when the children are asleep) or when it’s very quiet, so when you’re alone, everywhere. However, my wife hears nothing.
I find the buzzing sound is about equally loud in every room on the ground floor and the upper floor, which is the strange thing. In the basement, I don’t notice the sound, even though the technical room is there and there are no doors installed yet. But maybe that’s exactly why it can’t be heard there. When the kids are noisy, I also don’t hear the buzzing.

Where does the buzzing come from for you? To me, it sounds like it could be the same issue as with us. When it’s cold outside, it becomes especially strong.

The heat pump?
The underfloor heating?
The ventilation system?
The solar panels?
Or what else could it be?