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Question DetailsAsked on 4/26/2016

Approximately how much would it cost to add a laundry room onto our home?

We have a double wide trailer, and would like to add a new laundry room. We use the existing back door to go into the new addition so no changes would be made to our current home, and build the new addition ground level (as opposed to making it the same floor height as our home). We are thinking 8x12 room, one window. Electrical panel would be right inside the door to our house, as is the current plumbing for the washing machine.

Any ideas?

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1 Answer


For an 8x12 addition, simple construction with no fanciness, probably about ten to fifteen thousand if required to be on a foundation and depending on how cheap you go on the roof materials. If built as an enclosed porch or deck on shallow concrete footers - more like an arctic entrance or semi-attached shed - might get for as little as about half that amount.

Be sure to get any necessary permits for this - and might or might not be legal in your area to do as a stand-along semi-attached room, and of course has to comply with required setback requirements from property line. If in a trailer park, generally also not allowed so check the facility rules if not on private land.

One thing about the on-ground elevation plan - not only with respect to carrying the laundry up and down the stairs, but would likely add a bit of cost to dig down into the ground for the drain pipe to tie into the sewer line underground rather than at the trailer frame level where it is now. And of course don't forget heat and pipe insulation/heat tracing if your area ever gets below freezing - you do NOT want your laundry room freezing up as that can burst pipes and hoses and damage the washer.

Also - assuming this is a private property, bear in mind putting the addition at same floor level (with a drain gap or watertight sill between so if it floods water goes to the ground instead of into your house) would add more to resale value than having it "downstairs", especially if rigged as a mudroom as well. Also, having it at ground level, since an infrequently used area, would be more prone to vermin infiltration than if elevated. If elevated could also build in a concrete slab and enclosed storage area underneath if desired - with laundry room floor being a solid sheet or waterproof product like sheet vinyl or ceramic tile, with built-in emergency overflow drain pipe so if it eve flooded it would not drip down into your storage area. Relatively little added cost for that feature if desired.

You said you use the trailer back door to get into the addition - sounds like you mean you WOULD use the back door for that ? If that is what you mean, your laundry room would then need a legal fire egress door to the outside, with stairs down to ground level - or possibly exit out onto a porch or deck landing with stairs down to the ground one way, and down to the laulndry room the other way ? You cannot legally eliminate the back door egress, so this porch/deck might add a couple thousand $ to the cost depending on how you handle it, if the addition is not built at existing traler floor level.

Answered 4 years ago by LCD

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