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	key A groove in the top of a footing.
	keys Little fingers of plaster that squeeze through lath. When they harden, these hold the plaster in place.
	keystone An angular block centered over a door or window in a header or mantle.
	kick-out clause A clause in a sales contract that allows a seller to accept one buyer's contingent offer, then back out without penalty if a second buyer makes a better offer.
	kit home A structure that contains prefabricated components and is put together by a contractor.
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	knee wall A wall-like structure that supports roof rafters.
	knob-and-tube wiring An old-fashioned wiring system that has been replaced by fuses and circuit breakers.