Question 134 - the year of beginning of construction (laying the foundation):
This question is about the year when the construction of the building began. This is the year when the foundation of the building, or a part of it, was laid. The question is not about the year or the years when there were other additions to the building. For example, if the construction began by the building that consists of three rooms and their annexes in the year 1962. Then another floor was added in year 1975. In this case, the year of construction of the building is 1962 and not 1975. The enumerator in this case enters the year of construction in the corresponding field in the question. The entry fills four cells as follows 1962. In the case the year of the construction of the building is not known, the enumerator should write the phrase "not known" in the corresponding field.
With respect to marginal buildings (barracks, tents and hair tents, caves, caravans), they don't have a year of construction because they are marginal buildings. In this case, the enumerator put the sign (-). For industrial buildings (hangars and pre-fabricated buildings) used for purposes of industry or commerce, they should have year of construction.