An explanation

If you are a new buyer or just looking to renovate your home, here’s what to know. The first rule is if you wish to maintain the property as a secondary home then you may grow the construction by 30% only. It you wish to make this your authorised primary residence (with residency permits if foreign national), then you may grow the property to the maximum allowed by the Construction Zone Coefficient.

There are 2 main factors to take into account.

Find out in what Construction Zone your home sits. Once that you have this, you will be able to choose the method to calculate the maximum you can grow the property .

Currently, there are 2 methods available for the next 5 years, after which all will transition into the new method. During these 5 years it is your CHOICE. All calculations will remain valid after the transition.

This also benefits those properties that installed pools or spas without authorisations and need to now regularize their building space.

The previously used method calculated the zones by the index as noted below. This measurement includes the interior and exterior walls, but only habitable space (coloquially known as surfaces « chauffé ») : ie livingroom, bedrooms,etc. and excluding parking, basement, technical rooms, etc. Note : Spas, pools, and heated laundry or ski rooms do count in the m2. For foreign buyers, their autorisation takes into account « sweepable surface » , so the same as above but no walls.

The new method, known as IBUS, has increased the values significantly but includes EVERYTHING : pool, parking, basement, etc.

Zones Previous Method IBUS Method
Zone Touristique Centre T1 0.8 or 80% 1.07
Zone Touristique de Forte Densité T2 0.6 or 60% 0.8
Zone Touristique de Moyenne Densité T3 0.3 or 30% 0.5
Zone Chalet de Faible Densité T4 0.25 or 25% 0.5


  • Hot pink/ Fuschia – Density T1 -centre
  • Pale pink/Rose pale – Density T2 – heavy/forte
  • Pale khaki/Khaki pale – Densité T3 -moyen/ne
  • Pale yellow/ jaune pale - Densité T4 -weak /faible
  • Yellow/jaune - weak residential/ residentielle faible R3
  • Turquoise – Zone mixte
  • Light blue/bleu pale– destined for sport activities/destinées aux activités sportives


Cadastral maps

Direct link to the website:

Searchs are done using a Land Plot Number. (ie. parcelle 944 etc.)
If you want to see addresses:

  1. Click Données
  2. Click + beside Données
  3. Check box Cadastre and Addresses
  4. Click Valider

To see the Aménagement du Territoire:

  1. Click Données
  2. Click + beside Données
  3. Check Cadastre and Aménagement territoire
  4. Click Valider
  5. Check Plan de zone à batir under Amenagement territoire
  6. Check PAZ 2000
  7. Click + to see the colour key (deep pink= T1, pale pink=T2, pale khaki= T3, pale yellow= T4)



For those who may question whether their home respects these regulations, we highly recommend you to contact your architect or another competent local architect to study and implement the procedure to conformity.

No house may be safely sold if it does not meet the regulations. Swiss law rests on the concept of « bonne foi » or good faith. Therefore, any property transaction may be annuled should it not meet these standards, at the charge of the previous owner.