Fast-track procedureUnder review

Enlarged Villa and Heat Pump in Onex GE

11, Chemin du Monsû, Onex

Get new building permits filed in Onex by e-mail

For professionalspro

Extension of a villa by 19.7% in Onex, including a pergola, a carport, a storage building, sloped roof skylights, replacement of the oil heating with a heat pump, and felling or pruning of trees outside forest areas. For professionals, this means shell, carpentry, roofing, heating and outdoor works; the application has been filed and is not yet authorised.

Trades involved

Structural worksCarpentryRoofingHeating and ventilationLandscaping

Summary written by NovaNest’s AI from the official notice; check the details in the file.

The project

Extension of a villa (19.7%) - installation of a pergola - construction of a shelter and a storage building - skylights in the roof - dismantling of the oil heating and installation of a heat pump, felling and/or thinning of trees outside forest (RCVA)

Automatic translation of the official notice published in French.

Progress

Filed on 25 October 2026 · status as of 27 October 2026

1Filed
2Review
3Final review
4Decision
5Construction
6Closed

Location

See on the map Open on map.geo.admin.ch

People involved

Agent

Phoenix Architecture et immobilier Sàrl

M Marco CASTRONI c/o A&A Fidu Nyon SA Chemin du Midi, 8 CH-1260 Nyon

Applicant

M Matthieu Olivier Samuel Petit

Chemin du Monsû, 11 CH-1213 Onex

Second applicant

Mme Aneta Iwona Krawczyk Petit

Chemin du Monsû, 11 CH-1213 Onex

Owner

M Matthieu Olivier Samuel Petit;Mme Aneta Iwona Krawczyk Petit

M Matthieu Olivier Samuel Petit Chemin du Monsû, 11 CH-1213 Onex;Mme Aneta Iwona Krawczyk Petit Chemin du Monsû, 11 CH-1213 Onex

Other projects nearby

Information from the official public-inquiry notices. It may be incomplete; the official file prevails.