Sales of existing homes are recovering slowly, but a drop in supplies of those homes is pushing confidence among the new home builders to a six year high.

There are just 2.1 million existing homes for sale, which is a 22 percent drop from a year ago, according to the National Association of Realtors (NAR). Much of this is due to a drop in foreclosed and distressed homes, as lenders try to modify troubled loans more aggressively.

“In view of the tightening supply and other improving conditions, many potential buyers who were on the fence are now motivated to move forward with a purchase in order to take advantage of today’s favorable prices and interest rates,” wrote Berry Rutenberg, chairman of the National Association of Home Builders in a release Monday.

That pushed home builder sentiment up 5 points in November on the NAHB’s monthly survey. It now stands at 46, just 4 points shy of the line between positive and negative sentiment. Last year sentiment was around 19. The component of the index gauging current sales jumped 8 points, and sales expectations jumped 2 points, the only component now in the positive range. Again, much of that is due to a lower overall supply of homes on the market, as distressed homes fell to 24 percent of all sales, down from nearly 40 percent at the worst of the housing crash.

(Read More: Existing Home Sales, Homebuilder Sentiment Rise)

The nation’s five largest banks report that since March 1 of this year they have extended more than $26 billion in mortgage relief to more than 300,000 borrowers. $6.339 billion of that is in the form of principal reduction on first or second liens. All of this is in accordance with the National Mortgage Settlement signed this year by those banks with 49 state attorneys general and federal agencies over so-called “robo-signing” fraud.

While lenders are also pushing foreclosures that cannot be saved through the system more quickly, there is a ready cadre of investors waiting to buy. Investors made up 20 percent of buyers in October, according to the NAR. Since investors largely use cash, regular owner-occupants who largely need to use mortgages, can’t compete. 29 percent of existing home buyers used all-cash.

(Read More: Let Real Estate Help Pay for Retirement)

First-time home buyers, who usually make up 40 percent of the market, are still down at just 31 percent. So add up first timers and owner-occupants using a mortgage, and that is where you get the jump in demand for new construction. Home builders are clearly seeing this, with many of the big public companies seeing huge jumps in net new orders.

Sector Watch: U.S. Home Builders

—Toll Brothers
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—DR Horton
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—Hovnanian Enterprises
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—PulteGroup
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—Ryland Group
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—Lennar Corp
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—Beazer Homes USA
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—Meritage Homes
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—KB Home
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