Saw this wren perched on one of the granite boulders on the property while the house was in the early stages of construction. At first I thought it was a Bewick's wren because of the faint eyestripe, but I reconsidered since the eyestripe was not prominent, tail was short, and the overall coloration was pale with barely discernible streaking on the chest. Hope I'm right!
Rock Wren (Salpinctes obsoletus).
Description from the Kaufman Focus Guide: "A pallid wren of rocky desert, badlands, rockslides. Usually on ground or bobbing up and down atop a boulder. Nests inside rock crevices...Overall pale look; fine streaks on chest not always apparent."