The church is a single-nave hall church whose oldest part, the nave, is thought to date from around 1350, making it one of the older surviving church buildings in the area. The sacristy and porch were added later, in 1760. The walls of the nave and sacristy are built of horizontal log timber, and the whole building is rendered externally and covered with a wooden shingle roof, with wooden flooring inside. The freestanding bell tower seen today is a 1958 reconstruction based on the appearance of an earlier stapel.
Regular worship was moved elsewhere long ago, to Kyrkås nya kyrka (built 1845 in the village of Lungre), Häggenås kyrka and Lits kyrka, leaving the old church at Kyrkbyn as what is known in Sweden as a förrättningskyrka, used mainly for occasional services such as christenings and marriages rather than Sunday worship.
Inside, the altar dates from the 1600s and the pulpit from the period 1675 to 1724, giving the interior a mixed but distinctly early character. The pews were made in the 1950s by C G Blomberg as part of a wider restoration, after which the church was reconsecrated on 5 July 1959 by Bishop Ruben Josefson. An older gallery front panel has been preserved and mounted on the walls, offering a glimpse of earlier decorative work.
Several outbuildings stand near the church, including a former quartermaster's dwelling from the early 1800s, now used as a local heritage centre (hembygdsgård). Midsummer celebrations have reportedly been held here for more than forty years, with coffee served on summer weekends. The Kyrkås local heritage association, founded in 1947 specifically to care for the medieval church, continues to oversee its upkeep.