Exterior, Wood Siding Material, Glass Siding Material, House Building Type, and Saltbox RoofLine The pitched roof reduces the extension's surface area to 12 percent less than that of a flat-roofed extension, creating a more compact building envelope—which translates to less material needed for construction and less space to heat or cool.  Photo 2 of 12 in A Contemporary Extension Gives This Australian Home a New Face

A Contemporary Extension Gives This Australian Home a New Face

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The pitched roof reduces the extension's surface area to 12 percent less than that of a flat-roofed extension, creating a more compact building envelope. This translates to less material needed for construction and less space to heat or cool.