By Paul Ziobro 

Home Depot Inc. reported strong sales growth helped by healthy spending among wealthier Americans in an improving housing market.

Sales rose 6.1% at stores open for more than a year, including 7.1% in the U.S., in the first quarter, sending earnings 15% higher for the period. The company increased its sales and profit forecast for the year.

Chief Financial Officer Carol Tome said that about half of Home Depot shoppers live in homes valued at more than $200,000 which have experienced a stronger recovery over the last six years than those in low-income households.

"The nature of our customer base is helping drive this growth," Ms. Tome said on a conference call. Shares of Home Depot, up 8% so far this year, fell 0.7% in midday trading to $113.57.

In a weak retail environment, home improvement-stores such as Home Depot remain an outlier with consumers showing more of a willingness to spend money replacing windows and upgrading countertops than to splurge on fashion and everyday goods. TJX Cos. on Tuesday said sales at its discount home-focused chainHomeGoods rose 9%, much faster than the 3% growth at its fashion-focused siblings T.J. Maxx and Marshalls.

Wal-Mart Stores Inc. on Tuesday reported a scant 1.1% same-store sales growth at U.S. stores in the first-quarter, and other retailers such as Macy's Inc. and Kohl's Inc. have reported weak sales in the first months of the year.

Shares of Home Depot, up 8% so far this year, fell 0.7% in midday trading to $113.57.

Recent government data has fueled optimism that the housing market is picking up after a slow winter. U.S. housing starts rose 20% in April to a seasonally adjusted annual rate of 1.14 million, the highest level since November 2007. New applications for building permits, which shed a light on construction over the coming months, rose 10.1%.

Home Depot anticipates more upside in the housing rebound because home values haven't completely recovered to the highs hit before the recession. Having spent the recession focusing on maintenance and repairs, homeowners are now willing to consider bigger outlays such as redoing their kitchens or bathrooms.

"There's still room to recover," Ms. Tome said in an interview.

Consumer's investment mindset helped fuel a 6.8% increase in the number of sales of more than $900, as people bought items such as riding mowers, water heaters, windows and sheds. Smaller transactions grew less than half as fast, primarily due to the garden business, where purchases of soil and seed would come in at less than $50.

Home Depot's sales are being driven by more people coming into its stores, as the number of transactions rose 4.6% in the period. Average ticket rose 1.8% to $58.60. Online sales grew 30% in the quarter, but remain a small fraction of the company's total sales, which grew 6.1% to $20.9 billion.

Overall, the company reported earnings of $1.58 billion, up from $1.38 billion, a year earlier. Results were helped by a $71 million tax audit settlement.

Home Depot also has had to contend with the aftermath of a widespread data breach last year. The company has said it faces several dozen civil suits on the issue in which millions of customers' credit-card information and emails were stolen. To combat future thefts, the company has completed a project to encrypt credit-card data at the point of sale.

The company's first-quarter results included $7 million in breach-related costs, though Home Depot said it can't yet estimate the full scope of costs related to the breach.

--Chelsey Dulaney contributed to this article.

Write to Paul Ziobro at Paul.Ziobro@wsj.com

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