Plumbing fixture costs usually require two lines: the fixture itself and its "rough in, supply, and waste".

Remember that gas and oil fired units need venting.

General Estimating Tips for Plumbing

Review all construction documentation before proceeding with the estimate for Plumbing. It is not unusual to find items on the plans, but not in the specifications; or they may be in the specifications but not on the drawings. Also check any and all communications; the owner may have requested a change or expressed a concern or a specific need, and not have had it included in your drawings or specifications.

Review All Drawing Divisions - It is important to review all of the drawings available to ensure that the systems called for will physically fit where they are supposed to. Sometimes the architect subcontracts out the structural design, so if the drawings are not carefully coordinated, a conflict may result.

Check Drawing Scales - When utilizing drawings from different sections of the plans, always check to see if the drawing scales are the same. It has happened that an estimator has ended up with twice the length of piping needed (or worse, half) because he/she was not aware that the drawing scales varied from structural to mechanical.

Document All Inconsistencies - All inconsistencies with standard practice, conflicts, omissions, and other concerns should be addressed before the final estimate is resolved. Do not rely on memory, which can become quickly overloaded in a rush situation.

Read more estimating tips for plumbing.