Columbia South Carolina
Landscape Architect

The City of Columbia's Landscape & Tree Ordinance (Article 4 of the Unified Development Ordinance) applies to all new development and qualifying expansions on sites exceeding one acre. What that means in practice:

Tree disposition requirements. Any disturbed site over one acre requires a tree disposition plan prepared and sealed by a registered landscape architect. The plan must identify all trees of 6-inch DBH or greater within the disturbance area, designate each as preserved, relocated, or removed, and establish a mitigation strategy that satisfies the City's caliper-inch replacement formula. The City's formula calculates replacement requirements based on the total caliper inches of removed significant trees against a replacement ratio — and reviewers at Planning & Development Services will reject submittals that don't account for every qualifying tree or that propose replacement species not on the City's approved plant list.

For a typical 50-acre residential subdivision in the Columbia metro, tree disposition can involve surveying 200+ individual trees, coordinating protective fencing details with the civil grading set, and specifying replacement planting locations that don't conflict with stormwater infrastructure. Getting that scope onto the critical path early — before civil grading is finalized — is what separates a clean first submittal from a second or third review cycle.

Buffer and screening requirements. The ordinance requires Type A, B, or C landscape buffers between dissimilar land uses, with specific canopy tree, understory tree, and shrub requirements for each buffer classification. Parking lots exceeding 20 spaces require internal landscaping calculated on a square-foot-per-space basis, with canopy tree placement specifications that must account for underground utilities. Loading areas, mechanical equipment, and refuse enclosures require screening that meets height and opacity standards.

Planting plan content requirements. The City requires sealed planting plans that include plant schedules with botanical names, common names, size at installation, spacing, and quantity — not just conceptual layouts. Reviewers cross-reference proposed species against the ordinance's approved plant list and will request substitutions if proposed material doesn't comply. Installers working from non-compliant plans will trigger a re-inspection cycle that delays the CO.

Development projects in Columbia generating land disturbance of one acre or more must obtain a Construction General Permit from the South Carolina Department of Environmental Services (formerly SC DHEC). The permit requires a Stormwater Pollution Prevention Plan (SWPPP) and post-construction stormwater management features that meet the State's water quality volume and peak flow requirements.

Where landscape architecture directly intersects with the stormwater scope: bioswale design, rain garden sizing and planting, detention basin side-slope stabilization planting, and permeable paving systems all require coordination between the civil engineer's stormwater calculations and the landscape architect's planting and grading details. When those two scopes aren't coordinated from the start of the design process, you get conflicts — a bioswale sized for a specific drainage area that the planting plan doesn't match, or a detention basin side-slope specified at a grade that can't support the proposed seeding mix.

We engage with civil engineering stormwater design at the conceptual phase, not after the civil set is locked. That's the only way to produce landscape-integrated stormwater features that actually perform — and that pass review on the first submission.

Columbia sits within the Upper Coastal Plain physiographic region. Surface soils in most of the metro are Cecil sandy loam to Appling sandy loam — well-draining sandy soils that support good plant establishment under normal conditions. The problem is what's underneath: a dense, low-permeability clay subsoil (predominantly kaolinite) at depths of 18 to 36 inches that is pervasive across Richland County and much of Lexington County.

That clay layer creates a perched water table during heavy rainfall events — common in Columbia's spring months — and then switches to drought stress conditions in late summer as the surface sandy layer dries out. Plants specified without accounting for this moisture dynamic fail within two growing seasons. Irrigation systems designed without accounting for the clay layer's effect on infiltration rates either saturate the root zone during wet periods or under-deliver during dry ones.

Our planting palettes for Columbia projects are built around species that perform in this specific moisture cycle: native and climate-adapted material that tolerates both periodic inundation and summer drought stress without requiring intensive maintenance. We specify soil amendment protocols that improve infiltration in disturbed construction soils, and we design irrigation schedules and head spacing to account for the clay layer's effect on water distribution.

Columbia-area development frequently spans both Richland and Lexington counties, and the two jurisdictions operate on different schedules and with different submission requirements. Richland County's Development Review process runs through the County's Planning & Development Department, while Lexington County's review goes through its own Building and Development Services office. Projects within the City of Columbia's corporate limits — regardless of county — go through Columbia's Planning & Development Services, which has its own review cycle separate from either county's process.

We've submitted and managed permit approvals through all three of these review bodies. The practical implications: Lexington County's review timeline for landscape plans has historically run shorter than Richland County's; Columbia city reviewers are more detailed in their ordinance compliance checks than county reviewers; and dual-county projects require careful tracking of which jurisdiction holds authority over which parcel when a site straddles a county line.

Columbia’s humid subtropical climate — hot, humid summers with heavy spring rainfall and periodic drought conditions — creates durability challenges for both hardscape materials and plant material. We account for thermal expansion in paving specifications, surface spalling risk in material selection, and drainage performance in detail design. Planting palettes incorporate native and climate-adapted species capable of handling both saturated soil conditions in spring and drought stress in late summer without intensive maintenance intervention.