Key legal question
Whether costs for a nearly completely demolished and rebuilt house qualify as deductible maintenance/energy-saving expenses for direct federal tax.
Extracted holding
No. Energy-saving deductions apply only to measures on existing buildings; costs linked to a practically new construction are non-deductible building costs.
Extracted reasoning
After a far-reaching demolition, the works amounted in substance to a new construction. Under Art. 32 and 34 DBG, such expenses are not quasi-maintenance but construction expenses, even if they improve energy efficiency.