1 Provide plumbing to code-The average plumber is going to base their pricing on each individual element of the project. 2  For example, the under-sink plumbing will tend to come in at an average cost of $45 to $65 per hour, plus materials. Installation should be included.; and. 2  Vinyl floor tile-Average of $25 to $35 per square yard, for a total of $775. 3  Provide electrical wiring and lighting to code-This is going to depend upon the amount of work required, but electricians average from $65 to $85 per hour.