Field help: Thermal insulation of ceilings

Enter the costs for insulating floor/ceiling structures.

The thermal insulation of floor/ceiling structures is eligible for tax incentives when it involves the initial installation, replacement, or renewal of external components of existing buildings.

This includes the insulation of

• top floor ceilings to unconverted attics
• cellar ceilings,
• ceilings to unheated rooms
• floor/ceiling structure downwards against outside air
• floor surfaces against the ground