In 1878, a plot of land, then called Ebenezer no. 1, of "97 square rods and 2 square feet, or 9.7 kannland in size" was subdivided. It cost 250 kronor plus an annual ground rent to the parent farm of 2 kannor and 92 cubic inches of grain, half rye and half barley. It was Oskar Hubbinette, father of the well-known physician and professor Samuel Hubbinette, who owned the suitable land with a good location along the main public road that was subdivided.
The mission house in Säby was built in 1878 at a cost of 5,220 kronor and 69 öre. The building contained a large hall as well as rooms and a kitchen at the western gable end – all under a wood-shingle roof. The main entrance was also located at the western gable end. In 1894 it was found that the shingle roof was in very poor condition. As a result, it was decided that the roofing should be replaced with corrugated sheet metal at a cost of 700 kronor. The same sheet metal still covers the roof today. Two rooms were also fitted out in the attic and let out. The church hall contained pews seating approximately 60 people.
In 1905, the plot was extended to make room for outbuildings, and in 1912 further land was purchased in order to relocate the main entrance and improve the approach.
In 1911, the church was rebuilt to create a vicarage residence. After carefully investigating the cost (7,000 kronor), it was unanimously decided to carry out this renovation. The proposal involved dividing the large hall with a wall. A new kitchen was added on the north side and a door was opened into the large hall. The main entrance was moved to the eastern gable end, and the new pulpit was placed against the western end wall of the hall. In this way, two additional rooms could be added to the existing flat on the ground floor. The final building cost (in 1912) turned out to be 2,400 kronor higher than the estimate.
In 1919, when electricity was brought to the area, it was decided to install electric lighting throughout the building at a cost of 400 kronor. Following this renovation, the church hall measured 100 square metres and could accommodate approximately 100 people.
During the 1960s, a couple of major renovations were carried out.
During the 1970s, the lack of premises for children's and youth activities was a significant drawback for the parish's work. For several years, the aim was to free up existing flats for this purpose. The unfinished attic floor was also considered. In 1969, an optimistic working group of parish members carried out a complete renovation of the interior of the mission church, turning it into a functional activity centre that met high standards. The working group devoted 5,000 hours of their free time to this project. External walls were boarded and insulated by contractors.
In 1981–82, the church hall itself underwent a further major renovation. The hall was painted in new light colours, and a new platform was built on the eastern side to make room for a grand piano and a large church organ. At the same time, a new entrance was opened on the north side to create a cloakroom. The former kitchen was sacrificed for this purpose, and a new modern kitchen was fitted out on the western side. The windows are the original ones.