Architectural form changes, reinforcing and raising structures

ENTRY DATE: 18.04.2012 | LAST UPDATE: 18.04.2012


  • Coastal Regions
  • Urban planning


Applicable immediately

Technology Owners:

Architectural and construction firms

Needs Address

The need to reduce damage in regions that face greater risks from more intense tropical cyclones and storm surges, etc., due to climate change and the resulting damage from inundation.

Adaptation effects

By reinforcing structures in hazard zones, vulnerability to climate change will be reduced, and impacts on human safety, property, and economic activities will be reduced.

Overview and Features

In order to reduce damage due to storm surges, tropical cyclones, and inundation, etc., buildings are reinforced and raised, and architectural forms are changed. Examples include the following construction methods. 
  √ Raising buildings (using pilotis, such as columns, pillars, stilts, or supports that raise a building)
  √ Use of reinforced concrete
  √ Using higher building foundations
In some methods, existing dwellings and other buildings can be lifted to a higher level with the home furnishings and equipment as it is, meanwhile the building foundation can be raised, or the entire building can be moved to a higher elevation. 
Municipal and other governments can designate high-hazard zones, and then require or encourage changes in architectural form on buildings in those zones. 


・  Costs depend on the construction costs and methods in the designated zones.

・  The standard prices for work under a subsidy program to raise buildings in Nakano Ward (Tokyo, Japan) are indicated below:
  √  House raising: 78,000 yen/m2
  √   Renovation or new construction of wood-framed structure: 55,000 yen/m2
  √  Renovation or new construction of steel framed building: 42,000 yen/m2
  √ Renovation or new construction of reinforced-concrete building: 29,000 yen/m2


Depending on the method of implementation of the measures, the building owner must cover the costs alone. 
These options in some cases reduce convenience of day-to-day living. 
Buildings with raised floors, reinforced concrete, raised foundations and so on, require certain civil engineering and construction technologies. 
In the case of raising existing homes and buildings, it is important to use technologies that are suited to the types of buildings found at the sites concerned.

Co-benefit, suitability for developing countries

Even in areas where major infrastructure/physical measures cannot be immediately implemented due to cost or time constraints, etc., there may be ways to reduce damage.
In some cases, the convenience/comfort of housing can be improved by the changes.

Information Resources

・  Panel on Infrastructure Development (2008): Report on adaptation to changes in climate associated to global warming, on water-related disasters (in Japanese).

・  Nakano Ward website (page regarding construction subsidy program to raise buildings)