ABOUT · TEAM
Three Principals, end-to-end.
Every Alterra project is owned by one of the three Principals from the first conversation through final handoff. No designer-to-contractor handoff mid-project. Credentials listed on each bio; license numbers on record per D-14.
[OPERATOR: headshot image path for Jeffery Riddle]
Owner · Principal
Jeffery Riddle
Jeffery founded Alterra and has led the practice for more than two decades of DFW residential design-build out of its Richardson base. His work sits at the intersection of place-narrative reading and construction-side authorship: he walks the ground, drafts the scheme, and stays with the project through final handoff. The post-Uri freeze of February 2021 ran through every active project on his desk at the time and reshaped how he specifies plant material, details irrigation manifolds, and sequences hardscape joints. That discipline now threads through every Alterra project regardless of which Principal is leading. Jeffery takes the flagship neighborhood work as Principal — Highland Park, University Park, Preston Hollow — where the scale, architectural vernacular, and client expectation most closely match the twenty-year arc of the practice he built.
- TCEQ LI #
- [OPERATOR: TCEQ LI # per D-14]
- TMCNP #
- [OPERATOR: TMCNP # per D-14]
- TNLA Affiliation
- TNLA member · Texas Excellence in Landscaping, 2019–2025
- Additional Credentials
- [OPERATOR: any additional credentials — NALP, specific certifications — per D-14]
[OPERATOR: headshot image path for Hayden Davenport]
Principal
Hayden Davenport
Hayden joined Alterra as a Principal after Jeffery opened the practice to a second ownership-register role, and he brings a construction-side detail sensibility that lands particularly well on the hardscape and water-feature side of a project. He takes projects as Principal from first conversation through final walk, on the same end-to-end model Jeffery built the practice around. His working range across the service area runs from Richardson and the northern city hubs (Plano, Frisco, McKinney, Prosper, Lucas) into the Dallas flagship neighborhoods; he shares with Jeffery and Tyler the practice-wide post-Uri specification discipline and the place-narrative reading that underwrites every Alterra design. On site he is the Principal clients meet for the first Site & Story walk and the Principal they stand with at the final handoff.
- TCEQ LI #
- [OPERATOR: TCEQ LI # per D-14]
- TMCNP #
- [OPERATOR: TMCNP # per D-14]
- TNLA Affiliation
- TNLA member
- Additional Credentials
- [OPERATOR: any additional credentials per D-14]
[OPERATOR: headshot image path for Tyler Bigham]
Principal
Tyler Bigham
Tyler is the third Principal at Alterra and owns his own client relationships end-to-end on the same single-Principal model. His design-side background shows up in the drawing work — the resolution of plan, section, and planting scheme through the Design phase — and in how the resilience discipline gets documented into the specification rather than discovered during construction. Tyler takes projects across the full DFW service area with range into the Park Cities, the northern city hubs, and the inner-ring Dallas neighborhoods; like Jeffery and Hayden, he holds the client from first conversation through the one-year plant-performance review. Where the three Principals consult across projects, the subject is usually a technical depth question — a specific plant, a specific soil condition, a specific irrigation solution — rather than a handoff.
- TCEQ LI #
- [OPERATOR: TCEQ LI # per D-14]
- TMCNP #
- [OPERATOR: TMCNP # per D-14]
- TNLA Affiliation
- TNLA member
- Additional Credentials
- [OPERATOR: any additional credentials per D-14]
One Principal owns the client relationship.
Each of the three Principals carries a project from the first phone call to the one-year plant-performance walk. The client has one point of contact across every phase — First Conversation, Site & Story, Design, Plans & Permits, Build, and Handoff & Warranty — and that contact does not change when the drawing turns into a set of construction documents or when the construction documents turn into a site trailer. The person who reads the ground is the person who draws the scheme, and the person who draws the scheme is the person who calls the hardscape subcontractor about a joint detail in week eleven of the build.
Where the three Principals consult across projects, the conversation is about technical depth rather than load-balancing. A post-Uri freeze record that Jeffery documented on a 2023 project may inform a palette Tyler is specifying now; a hardscape detail Hayden has been running on a water-feature project may show up in a Jeffery scheme a year later. The DFW ecoregion is one substrate across all three caseloads, the material-supplier relationships are shared, and the specification discipline is uniform. What does not share is the client relationship itself: one Principal, one client, one continuous conversation. Review the Process for how the phases run.