If not, and some plumbing is already available (like you are converting a utility room to a bathroom) the cost would without going into details, know that you are talking about the 2nd costliest room in a house.
20+ Cost Of Adding A Bathroom Into A House
Background. Does adding a bathroom to a house increase taxes? Adding a bathroom to an unfinished basement will cost nearly as much as adding a bathroom addition to the house.
Can you fit another bathroom into your house? Most contractors say probably yes. You can limit floor space and reduce costs by adding a shower bathroom.
Adding a washroom to the house can be more interesting if it is designed beautifully.
Does adding a bathroom to a house increase taxes? Cost factors of installing a new bathroom. Does adding a bathroom to a house increase taxes? You don't say if you also have to add footage to your home to accommodate an additional bath.