Key legal question
Whether usable remnants from a partially burned building may be deducted even if later rebuilding requires compliance-related adaptations.
Extracted holding
Yes. Under the cantonal scheme, deductibility depends on objective usability for reconstruction; the authority did not act arbitrarily by not separately valuing hypothetical legal adaptation costs.
Extracted reasoning
The wording of Art. 27(1)(b) aGVG/GR allows a technical or functionally equivalent reading. The insurer used a lump-sum assessment method, made generous allowances, and the appellant did not show concrete disadvantage from the valuation.