cost of installing a basement bathroom
These figures assume no underfloor plumbing work and basic materials. Installing plumbing underneath concrete and/or choosing high-end materials will dramatically increase costs. 1  A relatively conservative estimate for installing a Â¾ or full bathroom in a basement is $8,000 to $12,000.2  Installing a Â½ bath in the basement might cost as little as $5,000.hese figures assume no underfloor plumbing work and basic materials. Installing plumbing underneath concrete and/or choosing high-end materials will dramatically increase costs. 1  A relatively conservative estimate for installing a Â¾ or full bathroom in a basement is $8,000 to $12,000.