top of page

About Us:

Founded in Texas, External Technical Services is a full-service outdoor living design and construction firm that exists to create spaces with form and function suited to your home or living space.  ETS is a detail oriented, creative, one-stop-shop for exterior masonry, carpentry, framing, aggregate, irrigation, and landscaping driven by a passion for creating spaces that spark curiosity and help clients create environments for healthier lifestyles.

The firm provides hand-drafted and CAD construction models, including site plants, elevations, and material lists through its design vertical. It provides general and subcontracting construction services through its in-house team and network of reputable technicians.

Cullen Quinn
Managing Principal


Cullen comes from four generations of Texans and has worked around agriculture and construction since age 5 driving his uncle's ranch pickup. He designed and remodeled his church's landscaping at 17 for his Eagle Scout, attended UNC-Chapel Hill at age 19, and joined an investment bank at age 22 where he advised building products companies on mergers and acquisitions and built relationship development, financing and technical skills for running a general contracting company.  He founded ETS at 25 to provide masterplanning, project management, and construction services to outdoor living clients in Texas. Cullen is an avid foodie and a poor hunter.




"I had a landscape design presented to me in a very timely manner at a very reasonable rate. It included a rendering of three flower beds and it looked amazing."  - Heather W.

"Cullen is a dependable landscaper who follows through and is always responsible for his work.  He has impressed me with this ability to complete large tasks with a lean crew and seems to get the most out of his people onsite." 

- Nancy D.


"Cullen and his crew were great! On two occasions, they showed up on time and did what they said.  I would highly recommend their services."

- Craig S.


"Cullen responded to our texts quickly, he was prompt on the day of our appointment and his work was excellent!  We highly recommend his company."

- Paul D.

bottom of page