Cost Analysis for Elevated New Construction Homes

Published 3-30-2019 search group

Cost Analysis for Elevated New Construction Homes.

Overview: As part of the Restore Louisiana Homeowners Assistance Program, IEM was tasked to provide a cost analysis for elevated new construction homes within the program. The cost analysis is intended to provide a realistic expectation of the additional costs that can be expected when constructing a foundation capable of elevating a home 3 feet or greater above existing ground.

Design Assumptions: While various constructions methods and designs may be considered, it is necessary to develop the cost analysis around similar floorplan layouts. This approach allows for the analysis to illustrate on how the total cost of construction efforts may vary depending upon floorplan size without being skewed with other design details. The following assumptions were considered:

Single story home with a pier and beam foundation.
Light Weight Timber Frame construction.
Floor system elements are included in the previously determined construction cost of the home.
Site work and Clean-up is included in the previously determined construction cost of the home.
Required Pile length of 35' per pile (poor soil conditions)
2' wide x 1' deep concrete grade beam cast-in-place at grade to laterally support piles and, if necessary, vertically support CMU piers.
Two means of egress (stairs) per home.
All connections between foundation elements are included in the unit price.
All labor, equipment, and materials are included in the unit price.
30' wide foundation plan with varying lengths to accommodate the program determined floorplan sizes.
Construction methods based on IRC 2015 or newer.
Engineering costs include designed drawings, acquisition of all relevant geotechnical information, any necessary site visits for compliance inspection, and any required final as-built drawings.

2100 sf plan with 6 Foot Elevation:

Item	Unit	Rate	Qty	Unit	Unit Cost
Timber Pilings	2100 /sf	$24.00	945	LF	$22,680
4 " Concrete Under Building	2100 /sf	$4.00	2100	SF	$8,400
CMU Block		$23.00	360	EA	$8,280
Survey	2100 /sf	$1,200	1	LS	$1,200
Geotechnical	2100 /sf	$0.96	2,100	SF	$2,019.23
Engineering	2100 /sf	$2.70	2,100	SF	$5,665.24
Elevation Certificate	2100 /sf	$1,200	1	LS	$1,200
As Builts	2100 /sf	$1,500	1	LS	$1,500
Stairs / Landings	2100 /sf	$5,000	1		$5,000
Façade Up Charge for Elevation	2100 /sf	$0.77	2100		$1,623.93

Total Cost	$57,568.40
Price Per SQ FT	$27.41

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