ᐅ Are the utility connections already located one meter inside the property boundary?

This varies greatly by region. You can always save money if you have multiple tasks done "at once." For example, the trench is open and each utility provider comes to lay their pipes, and it is only closed at the end, not repeatedly in between.

In principle, I agree with @Egberto. However, many home builders—especially in the prefabricated house sector—tend to overlook these additional services that must be carried out beyond the "single house" itself.

Either you take care of it yourself and do it yourself, or you negotiate a fair all-inclusive price for the internal development. There is a high risk of paying an extremely excessive premium at this stage if you are not knowledgeable or do not know the right people.

You can save money by:
- Doing the trenching work yourself
- Having everything done as a package by a licensed civil engineer or subcontractor

Regional differences:
- Who requires which dimensions / pipe routing
- Is conduit possible, and if so, which type
- Can the trench remain open, and if so, for how long (electric work sometimes requires the trench to be closed immediately after laying the cables)
- Who holds the license for work on drinking water, wastewater, electricity, gas...

That’s correct, it depends on the region and the utility providers. But maybe some of you would like to share actual costs in numbers for something like this.

This would help to get an idea of the typical price range involved. Or to put it differently: the utility connections on my property already come about 1 meter (3 feet) into the lot. The municipality has commissioned a company for the water connection. This company can also handle everything else. However, if they only take care of the drinking water connection (sewage probably excluded) and arrive with a green flexible hose (which seems to be commonly used), the process as I understand it is this: they dig from the sewer that reaches 1 meter (3 feet) into the property up to the house, lay in the green flexible hose, which then arrives at the utility room inside the house. Surely, they also install the water meter and connect it, but is there anything else involved?

Which flexible hose do you mean? The one that goes into the foundation slab and acts as a conduit?

This is how it went for me. I contacted the responsible water supplier to check the situation before I started building. They provided me with a 2m (6.5 ft) long DN80 flexible pipe. The structural builder/excavator installed this into the foundation slab according to the water supplier’s specifications.

The new connection cost us about €1700, which includes a flat rate for 10m (33 ft). If you need more, it costs €100 per meter (3 ft) in the public area and €50 per meter (3 ft) in the private area. However, in the private area, you get a €20 credit per meter if you do your own trenching.

I rented a mini excavator because I had about 25m (82 ft) on my property and dug the pit myself to about 1.3m (4.3 ft) deep. Then the supplier’s service van came and laid the water pipe in the trench. One end was connected to the main line with a socket, and the other end was pushed into the house. At first, the construction water meter was connected again. The final meter will be installed only after the installation with the water filter is complete and the installer orders the meter from the supplier.

It looks roughly like this.

Gas and electricity will look similar, but in my case, they go through the multi-utility connection.

Ah, that makes sense, the flexible conduit mentioned could be or might actually be the empty duct.