One Story Addition w Half Bath and Mudroom 72 SF

August 4, 2025 castlebri

6′ x 12′ Half bath, Mudroom, & closet addition w/ crawlspace. Demolition work. Excavation of crawlspace; Build insulated frost footings w/ concrete floor, & footings for new landing & stairway down to grade. Frame new opening from the house to new addition; Frame new floor, walls, & roof. New roof, gutters, & downspouts. New landing, railings, & stairway down to grade; Exterior trim around new exterior door & window. New siding, soffits & fascia. New exterior entry door w/ storm door & hardware. New bathroom window. New plumbing rough-ins for a half bath; New toilet, sink & faucet fixtures. New ductwork to tie addition into existing system (presumes that existing system has necessary capacity); New bathroom exhaust fan & venting. Upgrade existing electrical panel; Add lighting, switches, & outlets as per code requirements & client request; electric base board heat for crawlspace. Insulate exterior walls, rim joists, & roof. Sheetrock walls & ceiling; Add new roof attic access panel. Tile floor & tile base in the half bath. New interior doors for the bathroom & closet; Base board & shoe in the mudroom & closet. Jambs at the thru-way to the house; Casings around the doors & window; Shelf & rod for the closet storage. Upper medicine cabinet & vanity base cabinet w/ granite countertop. Bathroom accessory hardware. LVT flooring in the mudroom & closet w/ floor transition at the thru-way threshold. Painting & staining work. Final clean up.

Average Job Cost Low Range*
$129,287.37
Average Job Cost High Range*
$148,640.47
Design Costs
$3,500.00
* Please note these project prices include premium finishes and all labor and materials. By completing some of the work yourself such as demolition or painting and choosing moderate finishes you can expect to reduce costs by 10-20% or more.