RSMeans estimates the cost in Dallas (not exactly Garland, I know) to be about 84% of the national average. The National Association of Home Builders (NAHB) regularly conduct a home construction cost survey. A 2013 survey estimated the total cost to build a 2,600 square-foot home at around $246,453 ($94.5 per square foot). If you just go off the NAHB estimate and RSMeans regional adjustment, you’d be at around $183k for a 2,300 square foot place near Dallas.