I-BEAM:
A type of load bearing beam made of metal or composite wood whose cross section is shaped like the letter I.

INDIRECT COSTS:
Also known as "soft costs", those costs which are not automatically considered in a construction project.

INSIDE LOT:
Term for a property that is not on a corner at the intersection of two roads.

INSULATION, THERMAL:
Any material that offers resistance to heat transmission. When insulation is placed in walls, ceilings or floors it reduces the loss or gain of heat from outside sources.

INTERNATIONAL ARCHITECTURE:
Simple style of house, with little or no ornamentation.

ITALIAN VILLA:
A large, two- or three-story house in the Latin style, with overhanging eaves and masonry construction.