The Chapel of the Kazan Mother of God is located in the center of the village of Kostina Gora, at the bend of the river, at the intersection with the road. It stands out against the backdrop of free construction due to a group of old tall coniferous and deciduous trees, which visually support it as a compositional-planning dominant.

Originally, the chapel was a single-part structure with an open porch-gallery on the western side, a western entrance, and a staircase, emphasizing its longitudinal compositional axis. The building was a square log cabin on a low foundation, and the roof, shared with the porch-gallery, was gabled and topped with a cross above the prayer room.

The porch-gallery rested on a three-log foundation, had two corner square posts, and vertical spindle-shaped turned balusters. In the second construction period, it was sheathed inside and out, forming a narthex-vestibule. With the conversion of the porch-gallery into a narthex-vestibule, the composition of the chapel became more complex, but the extension of the porch with the western entrance and staircase is now lost.

The walls of the prayer room are hewn "in the round" and planed inside: without rounding in the northeast and southeast corners, and with rounding in the northwest and southwest. The walls of the main room and the narthex-vestibule are sheathed outside with horizontal planed boards, secured with factory nails, with a decorative base and cornice adorned with square and diamond-shaped dry biscuits.

The roof of the chapel is a single-pitched type, with hewn rafters and a nailed roof made of two layers of hewn boards. There is one window on the northern and southern walls of the prayer room. The windows are three-jamb, with the junction of the jambs "in a quarter," and with an inserted windowsill, "straight." The northern window retains traces presumably related to an earlier "volok" window.

The doors of the chapel are also three-jamb, with the junction of the jambs "in a quarter," and with a log threshold, "straight." The floor in the main room is single, made of planks "butted on dowels," laid perpendicular to the entrance, on one round beam. The ceiling, single, is made of planks "butted," perpendicular to the entrance, on one five-sided beam.

The Chapel of the Kazan Mother of God in the village of Kostina Gora, built in the late 19th century, represents historical and architectural value due to the preservation of the overall design and traces of two construction periods. It plays an important role in the development of the settlement and in the historically established system of cult buildings in the villages of Kostina Gora and Tatarskaya Gora.