Building law: Electrician refuses to continue

(5)If the basis of the price for a service provided for in the contract is changed due to a modification of the design or other instructions from the client, a new price is to be agreed upon taking into account any additional or reduced costs. The agreement should be made before execution.

You place sole responsibility for a missing agreement in your view on the electrician? Also, the term "should" in the last sentence is very vague.

(6) If a service not provided for in the contract is requested, the contractor is entitled to special remuneration. However, he must notify the client of the claim before commencing the execution of the service.

He did that – it was clear that your additional requests would also cost more. The electrician made a proposal and wrote a price on it. You then commissioned according to the plan. This was not identical to the proposal. It does not say that he must announce the exact amount of the claim before the service – for this, there are, among other things, unit prices and contingency items... The VOB is not a consumer protection law.

(5)If the basis of the price for a service provided for in the contract is changed by modifying the construction design or other instructions from the client, a new price is to be agreed upon taking into account the additional or reduced costs. The agreement should be made before execution.

Hello Alessandro

I see no chance for you to get out of this situation. A "shall" provision is always built on shaky ground. And the "basis of the price" still exists. You have only ordered additional items, and these extras will be charged. If you order a Mercedes C 200 Diesel, you are given a price for it. If you then order lots of extras, the price remains the same plus the extras.

Steven

He did that – it was clear that your requests for more would also cost more. The electrician made a proposal and wrote a price on it. You then commissioned according to the plan. This was not identical with the proposal. It does not say that he has to disclose the exact amount of the claim before the service – for this, there are unit prices and contingency items, among other things...

The VOB is not a consumer protection law.

That was not clear to us at any time! And that is exactly what this is about for me. I am the last person unwilling to pay extra costs if I actively decide to request more services. I never saw a price from the electrician because everything runs through the builder. I did receive the service description once at the beginning as a cost estimate (also without a price!), but since we changed quite a bit before construction started and the electrical work is included in the builder’s lump-sum offer, we assumed that we would be informed about any additional costs. The opportunity for that existed for months!

I don’t want to deny that I approached the matter naively, but I know it this way: after the measurement, a new cost estimate or a new offer must be created. Otherwise, due to a lack of knowledge of prices, I would be sending the customer out to the wolves...

In the developer's offer, Gira is also listed as an option for the switch program. I chose Gira E2. Causes additional costs! No one told me that in advance!

A construction site is not a kindergarten, every service someone provides has to be paid for. You commissioned 44 additional sockets, what is standard was known to you or is stated in the construction service description. You are fixating on the flowery term "high-quality" and say he should have informed you about it "the possibility existed for months". Why didn't you just ask what that stuff costs?

In the developer's offer, Gira is also listed as an option for the switch program.
I chose Gira E2. Causes additional costs! No one told me in advance!

once again, you ask.

Otherwise, I let the customer walk right into the trap due to ignorance of prices...

The customer is not just stupid and could simply ask.