The National Association of Home Builders/Wells Fargo index rose to 58 this month, up from 54 in October. That puts the index just short of September's reading of 59, which was the highest level since November 2005, shortly before the housing bubble burst.
Readings above 50 indicate more builders view sales conditions as good rather than poor.
The index released Tuesday found sentiment had improved in the Northeast, Midwest, South and West. Builders expect sales to increase through the next six months.
Still, other indicators show that rising builder optimism has not necessarily been paired with a significant improvement in sales. Purchases of new homes were nearly flat in September, the Commerce Department reported. The pace of sales for newly built homes has improved a mere 1.7 per cent so far this year compared to 2013, putting it below overall economic growth.
Rising prices in 2013 have cut into affordability for would-be buyers, limiting sales growth for new homes and cutting into sales for existing homes. On average last year, home prices rose at roughly six times the pace of wages, which limited the benefits of historically low mortgage rates.
Even as home price growth has moderated in recent months, the prices continue to rise at more than double the annual increase in wages. Average hourly pay for non-supervisory workers has risen just 2.2 per cent over the past year to $20.70, the Labor Department reported earlier this month.
Just 59 per cent of homes sold across the United States are affordable on a middle class income, compared to 62 per cent last year, the real estate data firm Trulia said Tuesday.
"Affordability is likely to worsen," said Jed Kolko, chief economist at Trulia. "Unless incomes increase substantially, homeownership will slip further beyond the reach of many households."