405 Barrett Ln, Austin, TX 78733

This rare multi-residence estate in Rob Roy on the Lake in Eanes ISD offers a 5-bedroom, 6.5-bath main house plus a single-story 2–3 bedroom, 2.5-bath guest house. Together, the two structures provide more than 7,500 sq ft of flexible living space on 1.58 acres. The 5,859 sq ft main residence features elegant formal spaces, generous living areas, a chef’s kitchen, main-level owner’s suite, office, multiple terraces and a negative-edge pool. Four oversized bedrooms and three full bathrooms lie upstairs along with a spacious game room will full kitchen. The 1,677 sq ft guest house lives independently with its own private driveway, garage, full kitchen, laundry and separate living spaces indoors and out. A beautiful rear terrace overlooks the canyon below, creating a peaceful retreat ideal for extended family, guests, older children, work-from-home needs or potential rental use. This gorgeous estate covers over 1.5 acres and has a super low property tax rate of just 1.6% due to its location in Travis County (not in City of Austin). Properties like this are rare in Westlake and should not be overlooked if you are in need of proper guest house for elders, a work from home solution or a luxurious space for guests when they come to visit, 405 Barrett Lane is your answer! And Eanes schools too!

The two-structure design at 405 Barrett Lane in Rob Roy on the Lake transforms a single luxury property into a multi-generational estate spanning 7,536 square feet across 1.58 acres in the heart of West Lake Hills. The main residence alone reaches 5,800 square feet, anchored by a chef's kitchen featuring dual gas and electric ranges, built-in cooktops, a double oven, and a full walk-in pantry that opens to a breakfast room overlooking a private courtyard. The scale becomes apparent immediately upon entry through the formal foyer, where ceiling-high architectural details and marble flooring establish the dramatic centerpiece of what unfolds as an open floor plan connecting multiple living areas.

The primary suite sits on the main level alongside a dedicated office, providing immediate access to the home's entertainment core. Upstairs functions as a completely separate four-bedroom retreat with three full bathrooms, independent kitchen, dining and living spaces, and a covered terrace capturing Hill Country views. This architectural flexibility means parents and adult children occupy genuinely private quarters without sacrificing a unified design aesthetic.

Beyond the main structure sits a 2025-built guest house delivering 1,700 square feet of contemporary design with three bedrooms, 2.5 bathrooms, and a two-car garage. The negative-edge pool becomes the landscape's focal point, anchored by multiple covered terraces that frame the backyard as an entertainment venue. Gas and outdoor grills, extensive deck space, a dog run, and mature trees exceeding 40 feet create layers of usable outdoor living.

The finishes reflect meticulous specification: granite counters throughout, ENERGY STAR appliances including a qualified refrigerator and dishwasher, solid wood and marble flooring, walk-in closets in the primary suites, and automatic sprinkler systems front and rear. The 5-car garage accommodates serious car collections or family vehicle fleets.

Enrollment feeds to Forest Trail Elementary, West Ridge Middle, and Westlake High School within Eanes ISD, one of Texas's strongest school districts. Property taxes run just 1.6 percent with a $1,000 annual HOA fee. At $577 per square foot on a 25-day market exposure, this estate addresses buyers seeking rental income potential, multigenerational living arrangements, or simply the space to live exactly as they choose.