Garage hélicoïdal de Grenoble, Art Deco parking garage in Grenoble, France

The Garage hélicoïdal de Grenoble is a reinforced-concrete Art Deco car garage built 1928–1932 on rue Bressieux, set in the middle of a residential block. A 7-metre-wide helical ramp makes just over seven turns at a uniform 5% slope, serving 225 boxes arranged laterally around an elliptical ventilation well capped by a glazed roof with two worked finials. Fifteen half-levels rise from a floor 2.80 m below street level to a conical skylight top at 24.2 m.

The structure opened in 1932 during a period when Grenoble experienced rapid growth in private vehicle ownership and needed new parking solutions. It was one of the early attempts to stack parking vertically and save space in the expanding city.

The building displays Art Deco features through its geometric forms and streamlined details that stand out against the residential architecture surrounding it. It shows how practical design and decorative style merged in 1930s cities.

The parking structure is located hidden within a residential block's center, with only an Art Deco entrance visible from street level. This makes it difficult to spot from the sidewalk, so checking the exact location in advance is helpful.

The helical ramp makes a little over seven revolutions at a uniform 5% slope, and its first turn lies below ground. The central ventilation well is elliptical rather than cylindrical, fitted to the rectangular plot, and is capped by a glass roof with two worked points.