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.
Create falling waters. In most basement bathrooms, you must create âfall,â or you must give the waste a push. All this pushing and falling costs money: Adding a basement bathroom could add $10,000 to your basement retreat budget. Wastewater from your basement bathroom sink, shower or tub, and toilet must have enough slope (another word for âfallâ) to drain properly and effectively.