Although the Japanese engineers have used the design of the larger sibling Sony Xperia Z5 as a role model, there are some changes compared to the old Sony Xperia Z3 Compact. The smartphone is now slightly more angular and you cannot really see the speakers anymore. The dimensions have also changed: the 8.64 mm (~0.34 in) of the Z3 Compact has increased to a thickness of 8.9 mm (~0.35 in), but the other values are almost identical. The new Xperia Z5 Compact is also nine grams (~0.32 oz) heavier than before at 138 grams (~4.9 oz).

Sony uses plastic with a sophisticated impression and an elegant and matted glass. Unlike the flagship Xperia Z5, the frame is not made of metal, but Sony still focuses on a high build quality. This is a success for the most part, because even high pressure on the back does not result in any picture distortions, and we cannot really twist the review sample at all. The gaps, however, are not always perfect, but you will have to look very closely to see that. Due to the IP65/68 certification for dust and fresh water, you cannot open the device, and the battery is integrated.

Once again, Sony offers unusual color options: As well as a simple white or black device, you can also get the Xperia Z5 Compact in coral (red) and yellow.