our approach

Three core values create foundation to streamline performance and service while reinforcing a system of delivering quality consistently.

  • Experience
  • Integrity
  • Enthusiasm

By focusing on these tenants, Mangum Lewallen is easily able to adapt to market trends and consumer perceptions. With constant internal self-evaluation, Greg and Brad’s teams evolve where needed to exceed expectations and “raise the bar” for customer satisfaction and quality. Combining forces with trusted partnerships, Mangum Lewallen provides a cohesive theme of detail and character for your home that feels alive and fully reflects your personality and style.

our methodology

In applying core values to the principles of designing, building, remodeling  and constructing your dream home, the team at Mangum Lewallen follows three tenets based on dedication to you and making your vision a reality.


Thrive on communication and provide customers 24/7* direct communication and insight into each step of construction process.

  • Online portal for timelines, documentation, build notes and collaboration
  • Weekly 1:1’s with Greg and Brad as check-in and continual feedback on goals
  • Continual education and resources regarding all custom building activities, trends, techniques and styles

Provide everything you need to stay organized and informed on every aspect of your home.

  • Access to all bids, receipts, expenses with open book accounting
  • Daily schedule updates and estimates

Assurance of craftsmanship by aligning with your dream, vision and goals.

  • Create unique team to make home a reality
  • Adherence to timeline and delivery of milestones

greg mangum

 LinkedIn Profile

Greg began building houses in San Marcos area with his father in the early 1990’s. From his start, he continually sought out trade and market knowledge so that he could quickly and effectively implement himself as an industry leader within the Texas home construction market.

This continual search for personal development and the goal to exceed expectations provided Greg a strong foundation for building lasting and respectful relationships with not only contractors, architects and designers, but also other builders.

Greg continues to challenge “the status quo” and places commitment to staff, clients and subcontractors at the apex of Mangum Lewallen’s business model.

brad lewallen

LinkedIn Profile

With a start in aviation as an aircraft builder and mechanic, Brad’s innate interest in precise, mechanical processes launched his journey and foundation for transitioning into custom home construction and remodeling.

His switch from airplanes to home building began in the early 1990’s within the Austin area. Brad quickly developed a keen sense of project vision and development, thus securing continued mutual respect and admiration from contractors, clients and builders alike.

Brad thrives on keeping projects running on time, and to the specifications and dreams of its homeowners. His smile and excitement can clearly be seen on every construction site; he is most happy nurturing relationships, face-to-face, with clients.

Associations, Partnerships & Teams

Mangum Lewallen is a proud and active member of the Austin Home Builders Association, The National Association of the Remodeling Industry and Austin Green Builders. Greg and Brad’s commitment to staff and contractors allows them to create ample partnerships and teams that work for you and for your vision. In managing hundreds of new home construction projects, many of the professionals have been on a team with Mangum Lewallen for an average of over 8 years!

Habitat for HumanityNational Association of The Remodeling IndustryHome Builders AssociationAustin Green BuildersThe Reuse People

“The mix of contractor, architect, and interior design must complement the owner’s desires. Creating the perfect combination gives custom home construction the fuel to grow. At Mangum Lewallen, we have the experience to put that team together.”

greg mangum