Renovating Buildings

Reinforcing the beam of a bridge pier using partial precast aramid fiber sheets


Evaluation of wind and acoustic conditions and the safety of wind resistance
(Before renovation)


Reinforcing the main girder using the aramid bracket method
(After vibration control
devices are installed


Renewing PC tanks using an aluminum-alloy roof

Renovation by base isolation and vibration control


To increase aseismic safety, a building is renovated based on the results of a seismic capacity evaluation. This is called aseismic renovation. There are four approaches to aseismic renovation:

  1. Conventional aseismic renovation: Quake-resistant walls and braces are added to a building.
  2. Vibration control renovation: Dampers are installed on a building to absorb earthquake energy.
  3. Base isolation renovation: A building is base-isolated to reduce seismic force.
  4. Hi-retro renovation: Base isolation devices are used along with vibration control devices to reduce seismic motion. However, the building itself is seldom reinforced.


We have a wide variety of base isolation and vibration control devices. By considering the existing conditions of a building and then choosing the most appropriate devices, we are able to renovate a building by base isolation, vibration control isolation, or a combination of the two in such a manner as to best suit the size, structural type, purpose, and requirements of a building.

Housing renovation

Housing renovation


We have constructed more than 200,000 condominiums throughout Japan. We have a thorough knowledge both of house and building design and construction. We use the experience and technology we have accumulated and developed over the years to provide housing renovation services. To respond quickly to renovation inquiries, we have many call centers throughout Japan and a central office for the renovation business operation called Shinjuku Customers Foyer.




To meet the demand for interior renovation, which is becoming increasingly sophisticated, and also to solve the office building oversupply problem, we have introduced a number of development programs. The "MiLL23-New Value NEXT OFFICE" is a program for converting existing offices into modern offices that suit modern requirements. Complementing this we have also introduced the "MiLL23-Conversion NEXT FACILITIES" program for converting existing office buildings to different uses. By integrating these two new approaches into one program and with the existing program "MiLL23" for building next-generation, long-life office buildings, we have completed a suite of "MiLL23 series" programs.