Housing conditions 3-6: Disaster Prevention and Housing

As of 2018, of the houses including non-wooden buildings, 298,400 houses built before 1980, before the establishment of the new seismic standards under the Building Standards Law, accounted for 18.1% of Yokohama City as a whole. , It has decreased from 2013 (336,150 units, 21.3%) at the time of the previous survey.
Isogo Ward accounted for 28.2% of houses built before 1980. On the other hand, Tsuzuki Ward   accounted for 7.4% (Figure 3-6-1).

Figure 3-6-1 Percentage of houses built before 1980 in each ward

Document: Ministry of Internal Affairs and Communications "2018 Housing and Land Statistics Survey"

Wooden houses built before 1980 accounted for 9.1% of 150,700 units in Yokohama City as a whole, a decrease from 2013 (174,830 units, 11.1%) at the time of the previous survey.
By distinction, Sakae Ward has the largest percentage of wooden houses built before 1980, accounting for 13.5%. On the other hand, the Tsuzuki Ward   accounted for 4.3% (Figure 3-6-2).

• Reference materials[Subsidy for Wooden House Seismic Diagnosis Service]

Figure 3-6-2 Percentage of wooden houses built before 1980 in each ward

Document: Ministry of Internal Affairs and Communications "2018 Housing and Land Statistics Survey"

Looking at the diagnosis results of houses that have applied for a wooden house seismic diagnosis conducted by the city (for houses built before the new seismic standards were applied), about 70% of them were judged to be "highly likely to collapse". More than 80% of wooden houses have been diagnosed as having some danger.
Conversely, the number of houses diagnosed as "do not collapse" is very small, 1.3%, and it is hoped that the use of seismic retrofitting work using the city's subsidy system will increase. (Fig. 3-6-3).

3-6-3 Wooden House Seismic Diagnosis Results (Yokohama City)

Document: City of Yokohama, Housing and Architecture Bureau "Results of Wooden Seismic Diagnosis"