I would say that the fact is 'saving' is singular and 'savings' is plural. This dictates the verb that follows. You could say A saving of $20 is ... or Savings of $20 are ...
A basement bathroom can be built for about $15,200, Fred estimates. Of that, plumbing is the largest component. These prices are based on costs for a small bath measuring about 6 by 8 feet, with 8-foot ceilings. However, many basements are limited to a 7-foot ceiling. Another potential cost-saving location for a new bathroom is the attic.
If you intend to add a bathroom to your basement, many of the costs associated with the installation are the same as if you were adding a bathroom on an upper level; however, due to the concrete foundation, running water lines and providing drainage require a different process.f you intend to add a bathroom to your basement, many of the costs associated with the installation are the same as if you were adding a bathroom on an upper level; however, due to the concrete foundation, running water lines and providing drainage require a different process.