Civil Engineering Services in Cumming, Georgia

Site Engineering and Stormwater Design for Forsyth County’s Rapid Growth Market

Cumming is the county seat of Forsyth County — one of the fastest-growing counties in the United States. The county’s population has surged over 50% since 2020, creating intense demand for new residential subdivisions, commercial development, and mixed-use town centers. This growth has also led to temporary moratoriums on new residential rezonings as the county manages school capacity and infrastructure strain. Mack Engineering provides civil engineering services for developers and property owners building in Cumming and throughout Forsyth County.

What Civil Engineers Need to Know About Cumming

• Forsyth County administers land development through its Planning and Community Development department. The county follows the Georgia Stormwater Management Manual with a county-specific addendum (adopted 2004, revised 2021) that adds requirements beyond state minimums.
• The county’s Unified Development Code (UDC) consolidates zoning, subdivision, and development standards into a single regulatory framework. The most recent version (v131, November 2025) reflects ongoing updates to address growth management and infrastructure capacity.
• Forsyth County’s tree ordinance (Ordinance 98) requires minimum post-development tree densities of 15 units per acre for commercial and industrial sites and 20 units per acre for residential sites. Tree density calculations using DBH-based unit values must be submitted with every land disturbance application.
• As-built civil surveys and plans sealed by a Georgia-registered Professional Engineer and Licensed Surveyor are required prior to Certificate of Occupancy for all commercial, industrial, condominium, and residential amenity projects. This includes hydrology verification confirming constructed stormwater systems match approved designs.

Development Activity in Cumming

Forsyth County’s development market includes single-family residential subdivisions, townhome communities, large-scale mixed-use projects (such as the 140-acre Crossing at Coal Mountain), commercial and retail centers along GA-400, medical office buildings, and warehouse and industrial facilities.

Civil Engineering Services Mack Provides in Cumming

• Civil engineering and land development plans for Forsyth County residential and commercial projects
• Land disturbance permit preparation and multi-department review coordination
• Stormwater design compliant with Forsyth County’s supplemental stormwater management manual
• Tree density calculations and Tree Save Area plans per Ordinance 98
• Grading and earthwork design with phased disturbance management (20-acre maximum phase limits)
• Infrastructure design including water main, sanitary sewer, and stormwater conveyance systems
• Feasibility studies and due diligence reports for Forsyth County property acquisitions
• As-built survey coordination and hydrology verification for Certificate of Occupancy

Cumming Municipality Resources and Hyperlinks

The following links provide direct access to Cumming’s planning department, development codes, and permitting resources:

→ Forsyth County Planning and Community Development

→ Forsyth County Unified Development Code

→ City of Cumming Planning and Zoning

Forsyth County’s permitting process involves multi-department coordination and strict compliance requirements. Mack Engineering navigates this process daily. Contact us to discuss your Cumming or Forsyth County project.