NRS 108.22128: “Improvement” defined.

“Improvement” means the development, enhancement or addition to property, by the provision of work, materials or equipment. The term includes, without limitation:

1. A building, railway, tramway, toll road, canal, water ditch, flume, aqueduct, reservoir, bridge, fence, street, sidewalk, fixtures or other structure or superstructure;

2. A mine or a shaft, tunnel, adit or other excavation, designed or used to prospect, drain or work a mine;

3. A system for irrigation, plants, sod or other landscaping;

4. The demolition or removal of existing improvements, trees or other vegetation;

5. The drilling of test holes;

6. Grading, grubbing, filling or excavating;

7. Constructing or installing sewers or other public utilities; and

8. Constructing a vault, cellar or room under sidewalks or making improvements to the sidewalks in front of or adjoining the property.