what does the fine print in the contract annex say about this?
What do you mean by the fine print?
There are several sections:
"Due to the Corona crisis, performance disruptions, especially delays during the construction period, cannot be ruled out. Neither the client nor the contractor can estimate the direct (e.g., illness-related absence of the contractor's and/or their subcontractors' and suppliers' workforce, absence of workers who care for and/or look after relatives of any generation, quarantine measures, etc.) or indirect consequences (restrictions on travel and/or freedom of movement, curfews, border closures, etc.) and subsequent effects of the Corona crisis at the time the contract is concluded.
The parties therefore agree that any direct and/or indirect consequence of the Corona crisis that directly or indirectly affects the performance capability of one of the contracting parties shall not be considered a performance disruption - especially not a delay.
Any circumstances of this kind extend the construction period and are not considered to be the fault of the client or contractor."
"Due to ongoing supply bottlenecks with various building materials, the following amendment to §3 paragraph 2 sentences 2 - 4 of the contract for work is agreed:
1. The agreed fixed price remains unchanged for contracts concluded by ----- and a construction start no later than -----.
2. If the construction start occurs, with the same contract conclusion, in the period ------, the offer price (= base price of the house, plus additional services, minus reductions) will increase by a flat rate of 1%.
3. If the construction start occurs, with the same contract conclusion, from ------, the offer price (= base price of the house, plus additional services, minus reductions) will increase by a flat rate of 2%.
4. If the construction starts later, a price adjustment will be made as agreed in the contract for work."