Pipes will have to be brought down, and a sewage pump and backwater valve might have to be installed to ensure proper drainage of effluent and bath/shower water if gravity doesn’t work in your favor. Take care to ensure moisture prevention with a dehumidifier and vented fan system. Many building codes have minimum dimensions regarding how close each fixture can be to the next.
Basement waterproofing costs about $1,480 for simple crack filling with an average of $2,000 to $6,000 for drainage improvements. Costs range from a minimum of $250 up to $20,000. Most homeowners waterproof after they discover water in the basement from poor drainage around the foundation and walls. Waterproofing will be a lower cost if it's included in a larger basement finishing project.
Wall finishing systems are rapidly gaining in popularity. These systems feature fiberglass panels and pieces of trim that fit into PVC framing. Panels covered in fabric offer an attractive finished appearance to the basement without the work of drywall taping and painting. Advantages include durability, moisture- and fire-resistance and the ability to remove panels for access to water pipes and electrical wiring.
In most cases, your HVAC system should already extend to the basement. If not, however, plan on running additional ducts or vents to ensure the finished rooms are adequately heated. Running new ductwork through your basement will cost around $2,000. Radiant heat is another option for basements, as it can be controlled separately and used only when the basement is. Radiant heat costs around $6,000 - $14,000 depending on the method used.
Planning is the first stage with any basement bathroom installation. For a basement that's designed as a recreation room, work space, or kids' play area, a half-bath (stool and sink, but no shower or tub) is adequate. A basement with bedroom or en suite needs a full bathroom. Knowing how you plan to use the basement living space typically dictates the functional purpose of its bathroom.