How much does adaptation works cost?

The estimated cost is No fee; works costs are yours. Costs include administrative fees and charges.

What documents are needed for adaptation works?

Required documents: Notification of adaptation or rehabilitation works (Form 24), Description of works, Overview of technical specifications of materials.

Who do I contact for adaptation works?

Construction inspector — Receiving the notification and supervision.

What are the steps for adaptation works?

The procedure consists of 4 steps: Check whether the works are adaptation or rehabilitation, Prepare a description of works and material specifications, Submit the notification (Form 24), Carry out the works.

Construction & Permits

Notification of Adaptation and Rehabilitation Works

Adaptation or rehabilitation works on an existing building (e.g. rearranging rooms in a flat, replacing installations) do not need a building permit, but they are notified to the construction inspector. If the structure or facade changes, it is reconstruction and a permit is needed.

Inspector's reply within 7 daysNo fee; works costs are yours4 steps

Checked against official sources: October 2026

Adaptation or rehabilitation is a change in the organization of space in a building or replacement of devices, equipment and installations, provided this does not affect stability and safety, does not change load-bearing elements, power up to 15% of capacity (wording introduced by amendment 114/26), design capacity or the exterior, and does not affect neighbours, traffic, fire protection and the environment (Art. 7 para. 1 point 1).

Responsible: Owner / designer

Deadline: 1 day

Note: If the works affect load-bearing elements, the facade or increase capacity, it is reconstruction, extension or superstructure and a building permit is needed (Arts. 33–34). For a larger change of power or capacity ask the inspector. Photovoltaic systems and heat pumps up to 999 kW need no building permit but a notification with technical documentation, and the procedure (up to 30 days) is regulated by the municipal assembly (Art. 74a, amendment 114/26; the rule was to be adopted within 60 days, Art. 146a). Check whether your municipality has adopted that rule and where the notification is filed.

All Procedures

Notification of Adaptation and Rehabilitation Works

1Check whether the works are adaptation or rehabilitation

4Carry out the worksCarry out the works according to the notified description. If they are carried out without notification and without the documents under Art. 42, the construction inspector may ban the works (Art. 138), and failure to notify is an offence (Art. 140).