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Table 5.6 POST AND PILE COSTS (dollars) Length of Moober (ft .) 10 II 12 13 I4 15 16 17 18 19 20 100-150 110-165 120-180 130-195 140-210 150-225 160-240 170- 255 180-270 190- 285 200-300 based on height above grade and no considera- tion for scour, is shown in Table 5.7. Table 5.7 COST PER FOOT OF MANUFACTURED HOME' (dollars) HeJght or Post/PHe Above Grade (Ct.) . 5 , 7 . , 10 Single SectJon 20-30 22-33 24-36 28-42 32-48 36-54 40-60 [huble Section 4(1-60 44-66 "8-72 56-84 64-96 72-108 80-120 The design of a wood foundation also necessi- tates the use of horizontal beams, cross bracing, and other hardware such as bolts, clips, etc. In addition, labor costs to construct such an elevated foundation must be included. Because material and labor costs vary widely, as will the design of each wood foundation, it is very difficult to provide estimates for this aspect of an elevated wood foun- dation. Based on actual construction costs for elevated.wood foundations, costs associated with these materials and their installation will be roughly equivalent to the cost of the installed ver- tical members. Hence, the total cost for a wood elevated foundation can be estimated by doubling the cost for the posts/piles previously presented. Jacking The placement of jacks and jacking of a manufactured home are based on the desired height above grade. Table 5.8 provides general estimates based on height above grade. Miscellaneous As discussed in Section D of Chapter IV, there will be other miscellaneous costs associated with elevating a manufactured home. These include utilities, equipment, access/egress, etc. Based on the height above grade, these costs should be approximately the same regardless of the method of elevation chosen. Subsequent to determining the desired height above grade, costs for these items should be developed with the help of a local contractor and included in Part 1/ of the Design Worksheet in Appendix F. Note that even with a coventional installation, these costs will still be applicable. Essentially, the only cost increase can be attributed to materials and labor to extend or increase the height of the elevated manufactured home. Summary of Total Costs Based on the information presented in this chapter, it is possible to estimate the relative costs of various elevation strategies. As previously discussed, there are both fixed and variable costs associated with an installation. In addition, the cost of a conventional installation must be considered and subtracted from the elevated design cost to obtain the real cost of the elevated foundation design. Based on the information previously presented, Figures 5.1 and 5.2 have been prepared to provide a general overview and com- parison of costs. Figure 5.1 provides an estimated cost per foot length of manufactured home in comparison to height above grade for single section manufac- -tured homes. Figure 5.2 provides the same infor- mation for double section manufactured homes. Note, as previously discussed, costs for each particular installation will vary due to a number of design and site specific considerations. It is, therefore, strongly recommended that cost estimates for each elevated design alternative be secured from as many manufactured home installation contractors as possible. Table 5.8 JACKING COSTS (dollars) Height Above Grade (ft. ) 3 4 5 6 7 8 9 10 Single Section 250-350 300-400 350-450 400- 500 450-550 500-600 550-650 600-700 LOuble Sect ion 500-700 600-800 700-900 800-1000 900-1100 1000-1200 1100-1300 1200-1400 74