A dedicated churchyard was established at Singö only in 1713. The current church was built in 1753 as a cross-shaped timber structure, constructed from horizontal log walls, with a polygonal chancel and a west tower. The sacristy occupies the angle between the chancel and the north transept.
The church's appearance has changed considerably over time. A heavy-handed restoration in 1895 altered both the interior and exterior, including painting the outer walls with white oil paint. In 1922 the roof was reclad in sheet metal, replacing an earlier asphalt-coated felt covering. A further restoration in 1964–65, led by architect Hans Westman, deliberately reversed many of the 1895 changes: the facades were reclad in red-painted timber panelling, and the internal panelling was stripped away to expose the original log walls once again.
The most notable furnishing is the altar cabinet, carved in Lübeck in the 1490s. It came to Singö in 1761 as a gift from Hargs kyrka, giving the church a substantial medieval artwork with a documented history of travel between parishes. The pulpit, an octagonal basket with a sounding board, bears a painted date of 1699 but is thought to be older, possibly from the 1500s; it was painted white during the 1895 restoration before its original colours were uncovered again in 1965.
The font is carved from marble quarried locally on Singö and was made in 1965 to a design by Hans Westman — one of a group of roughly fifty fonts across central Sweden made from the same Singö marble. A votive ship model, painted black and red with a crowned griffin as its figurehead, hangs in the church; it was donated in 1752 by a local couple. The current organ was installed in 1941, replacing an earlier pipe organ bought in 1883, which itself succeeded a harmonium acquired in 1862.