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.
For example, Mike says that a kitchen reno can cost $10,000 to $40,000, bathrooms are between $10,000 and $20,000, basements cost $30,000 on average, while an addition is from $90 a square foot up to $360 a square foot.5.00 per square ft to build a deck...wow. using 2 x 6 pt joists and 5/4 decking would cost approx $4.50 per sq ft to buy....Just 50 cents per sq ft labour.... $12 per ft for fencing....6 ft pt fence with 4 x 4 posts cost about $11.00 per ft to purchase materials...Just $1 per foot to construct.