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The idea has fascinated kings and commoners: adding new space to

an existing home can increase enjoyment inside and beauty outside.

You do not have to be Louis XlV, who expanded his father s hunting

lodge at Versailles to accommodate 5,000 people, or even Thomas

Jefferson, who shaped and reshaped a cottage at Menticello for 40

years, to conceive and construct a handsome, useful expansion of

your house. Before building begins, there are choices to weigh and

challenges to assess.

Whatever your need-a breakfast nook, new bedrooms and baths,

a family room or extra space in a living room-there are three

possible ways to achieve it: building out, by adding a small extension

alongside an exterior wall; building up, by placing a second story

atop an attached garage or installing a dormer in an attic; or building

in any direction to create a major addition, a collection of rooms that

forms an independent wing of the house.

All additions have one characteristic in common-at the junction~

of the new and the old, strange metamorphoses occur. Outside walls

turn into inside ones, roofs turn into supports and ceilings turn into

weight-bearing floors. Crucial to the chemistry of such changes is

splicing the new to the old. It is the techniques required for these

connections-rather than the basics of trade s work or the job of

finishing an addition s exterior and interior-that this book concen-

trates on. Cantilevered joists, for example, tie the floor of a walk-in

bay window to the house floor. Extra studs are integrated into exist-

ing walls to mate with the ends of new ones. A weathertight joint

between a new roof and the old depends on precise measuring and

marking, cutting and joining.

An addition raises an important esthetic challenge: creating archi-

tectural harmony between the old and the new. Although there are a

few time-honored guidelines for matching an addition to a house

(pages 8-15), you are likely to find an architect s advice helpful in

solving esthetic problems. But whether you use a professional s expe-

rience or your own good taste, the result should be an addition that

looks as if it ought to have been there all along.