3.11 Prepare a Cost Estimate Estimate the trail construction or renovation costs by determining the quantity and price of materials, labour, equipment, and administration. Calculate the total length and type of trail construction according to the different techniques required; eg. some sections may need minimal clearing, while other require boardwalk construction. Estimate the total and unit costs of materials such as lumber, culverts, tread surfacing, signs and printed information. Modify the trail design details to reduce the cost of materials if required. Estimate the cost of labour for trail clearing and the construction of bridges, boardwalks and other trail elements. Allow for differences of terrain, weather, transportation time and other delays. Base labour estimates on a crew of 3 or 4, or as determined by the type of construction management planned. Assume one fore-person for each crew. Estimate the costs of equipment purchase or rental. Estimate the costs of construction start-up, transportation, food and accommodation, as well as administrative costs such as construction supervision and management.