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Question DetailsAsked on 9/28/2014

how much does it cost to lay block foundation for a double wide 28x70.

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Depends a lot on your soil conditions and frost penetration depth, which controls depth and type of foundation for the wall. Basically speaking, it is certainly going to cost significantly more than $10/SF because that is about what a typical block wall costs, without the cost of digging to foundation depth - so most likely, you are in the more like $20-30/SF range for a low foundation wall - more if this is being done after the fact, with the trailer already there. And don't forget you undoubtedly need a wall under the splice between the two units, too - and you typically want to provide a couple of pass-throughs between the two sides for access and ventilation - and don't forget access hatches and ventilation, cross-bracing joists for the walls, etc - all of which are why this type of job typically requires plans from an engineer or architect to be able to get your building permit.

Also, not knowing your desires or locale or budget, but putting a full foundation under a manufacturer home or double wide isnot respectively a lot more expensive than a crawlspace - so you might consider if tht is somethingyou want ot think about. Your engineer or architect could whipup a comparative cost for you, but especially in deeper frost areas the differential cost is not that much - typically the basement slab is the biggest incremental cost item, and it does give you a lot more usable space, though of course requires separate entrance, additional HVAC capacity, electrical etc. so not "cheap".

If doing this in anticipation of putting trailer on top, you need to coordinate with the trailer mover about how the trailer is going to be put on the foundation - you can't just drive it onto a foundation - there is at least some and sometimes a lot of jacking and sometimes cranework, so this has to be coordinated by or at least with the contractor installing the trailer.

If building after the fact costs more per SF because of the confined space issue, plus you have to work around supporting the trailer on jacks while building the wall, then lowering it onto the walls.

Answered 6 years ago by LCD

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