Home builder confidence in the market for newly built single-family homes increased five points in September, reaching an all-time high of 83, according to the NAHB/Wells Fargo Housing Market Index. Historic traffic numbers have builders seeing positive market conditions, but many in the industry are worried about rising costs and delays for building materials, especially lumber. Lumber prices are up more than 170% since mid-April, adding more than $16,000 to the price of a typical new single-family home.