Obtaining a building permit is different for each country. Therefore the first step in the renovation process is to obtain the necessary information.
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To get things more easier underneath follows a short manual
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In Italy there are several building permits
1. Denuncio Inizio Attività (DIA):
This is the simplest building permit and is valid for small to medium renovation such as
- floor repairing,
- roof repairing,
- underpinning of walls,
- foundation works,
- new openings in interior walls,
- replacing existing windows by thermal insulating glazing
Between submission of the permit and the construction start date, a period of minimum 20 days must pass. After this period the works can start. However the exact starting date must be announced at the appropriate authority. The works should start no later than one year after the submission of the dossier and may have a length of maximum 3 years.
Note: In Italy, such planning permission is also required for the fencing of the garden and placing a fence at the main entrance
2. Permesso di costruire or concessione edilizia: 
This permit is required for new construction and extensive renovation works such as
- new openings in exterior walls,
- extending existing dwelling,
- swimming pool construction,
- partial demolition and replacement of the existing construction,
- external works affecting the environment such as garden walls
3. At least there are the “notifiche”:
These aren’t building permits but actually a written communication to the authorities regarding maintenance works. These include
- replacement of broken roof tiles,
- repainting of windows, facades,
- replacing gutters,
- …
In a previous article I already talked about permits for structural interventions for which a structural engineer is needed. It is evident therefore that the permit “permesso di costruire or concessione edilizia ” belongs in this category.
As for the DIA: if the works are related to the structural part of the construction then an engineer is required in the other case (for example by replacing existing windows with thermal glass windows) no engineer is required
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