More modern versions of the tool add in a laser beam projector, which allows builders to level out the device and "draw" a long line of light across a wall, indicating an exactly level surface.

FORBES: No. 18 The Level

That group, which includes PulteGroup and Ryland Group, also caters to buyers who have fewer issues qualifying for mortgages than entry-level home builders like KB Home, D.

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The builders are onto the next level, and just when you think they are done, new levels are getting added on.

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Homex, one of Mexico's largest home builders, focuses on the entry-level and middle-income housing segments.

FORBES: Spend, Spend, Spend

The housing market, though still weak, has hopeful signs: Home builders' sentiment rose to the highest level in nearly five years in February.

WSJ: Mild Winter Could Help Home Depot Earnings

At that level there is additional capital available for builders and developers.

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U.S. builders started construction on 1 million homes last month, the highest level since June 2008, the Commerce Department reported Tuesday.

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Still, the builders' outlook for sales over the next six months climbed to the highest level in more than six years, suggesting that the obstacles could be temporary.

NPR: US Housing Starts Surpass 1 Million In March

Home builder sentiment rose for the seventh straight month in November, hitting its highest level in six and a half years, according to the National Association of Home Builders.

FORBES: Housing Recovery Continues To Take Shape Despite Superstorm Sandy And Looming Fiscal Cliff