What architectural style does the houses in Santorini, Greece use?

Answer 1

Cycladic style. However Santorini, with roots in pre-history, developed a local architecture based on the vault using local materials. The sculptural forms of the houses, either built or dug-out, the intense light and the metaphysical atmosphere of the island compose an environment which is singularly impressive.
Should you wish further info read book :
"Santorini" - Greek Traditional architecture-by ''Melissa'' Publishing House

Answer 2

The Alonia Studios in Santorini, Greece are built according to the Cycladic architectural style.

The architectural style of Dameia Palace Hotel in Santorini is based upon traditional designs that date back close to 4000 years. The 46 guest suites are set among lushly flowered paths and courtyards. They feature clean, sharp lines, traditional domed roofs, and brilliant white stucco walls. The vivid blues of the sky and sea are reflected in the vibrant cobalt color of the doors and windows of the buildings. The interiors are adorned with smooth white marble from the legendary mines of Mount Olympus. It is used through out the complex, covering every floor throughout your suite. The total effect is one of elegance and simplicity.

The SummerTime Pension Hotel is situated in Fira, the capital of the spectacular island of Santorini. The hotel is designed according to the traditional architectural style of the Cyclades Islands, in shades of bright white and blue.

Answer 3

I'm not sure if there's more than one or not. I found this:
"Hotel Melina is built in traditional Cycladic architecture." So far, no other style.

Yes, I checked a bit further and the only thing I could find was Cycladic style. Hope this helps.