A valuable addition made to property (usually real estate) or an amelioration in its condition, amounting to more than mere repairs or replacement of waste, costing labor or capltal, and Intended to enhance lts value and utility or to adapt it for new or further purposes. Spencer v. Tobey, 22 Barb. (N. Y.) 269; Allen v. McKay, 120 Cal. 332, 62 Pac. 828; Simpson v. Robinson, 37 Ark. 132