How to Build Subbasements

A subbasement is a level or floor of a house or building that is located beneath the main basement. For example, in the 1950s, a subbasement was added to the White House during a major renovation. Grand Central Terminal in New York City also has a subbasement. It is possible to add a subbasement to your home if you live in a region that has a relatively dry climate and the land you are building on is stable and solid. However, this is not a do-it-yourself project due to safety issues. Not only must the project meet building codes, laws also require that basement excavation be done by trained professionals.

Instructions

- 1
  Check with your city building code before starting to make sure your area permits the construction of subbasements. Cities in certain flood zones or with wet environments may restrict against the building of subbasements.
- 2
  Review your property outline to ensure the subbasement will fall within your property lines. For example, if want to build underneath a condo, duplex or townhouse that you own, the building could interfere with your neighbor's property line. In this case you will need legal permission from your neighbor, as well as legal permission from any relating home associations.
- 3
  Hire a structural engineer to visit the property to determine if your land is structurally safe to build a subbasement. This also will determine if there are any electrical or plumbing issues present.
- 4
  Have a professional excavator survey the land and provide you with a soil report. In addition, request a proposal for ground protection treatment and dewatering, as well as for excavating the land.
- 5
  Hire an architect to draw blueprints of the space. This will give contractors and excavators a clear plan to follow that will meet the building code.
- 6
  Hire a contractor to install lattice beams, a floor slab and traditional framework, as well as walls.

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