Industrial, warehouse and flex site development in Metro Atlanta
Last updated: November 2026
Quick answer: An industrial site is mostly roof and pavement, so the civil problem is fitting a flat pad, a truck court and the detention a mostly impervious site needs inside whatever the buffers and setbacks leave. The deal killers, in order, are detention that does not fit, the buffer and setback stack, utilities that were assumed rather than confirmed, topography, and truck access that triggers a traffic study. A written conforming use letter from the county removes the largest single risk. Budget four to eight months from concept plan to land disturbance permit on a straightforward M-1 site, and 12 to 18 months where rezoning or off-site road work is involved.
Key takeaways
- Post development runoff on an industrial site is often three to five times the pre-development condition. If detention does not fit, the building shrinks or the deal dies.
- Buffers, setbacks and truck court screening can take 30 to 50 percent of a small industrial site.
- A conforming use letter, usually $0 to $200, is the first thing to obtain on an industrial acquisition.
- Warehouses over roughly 100,000 square feet typically trigger a traffic impact study and can require turn lanes at the developer’s expense.
- Mack Engineering provides feasibility, stormwater concept design and full land disturbance plan sets for industrial sites, with the same engineer from the first screen to the issued permit.
An industrial site is mostly roof and pavement. The civil problem is fitting a flat pad, a truck court and the detention a mostly impervious site needs inside whatever the buffers and setbacks leave behind.
Mack Engineering provides feasibility, zoning verification, stormwater concept design and full land disturbance plan sets for warehouse, distribution, flex and light industrial projects across Metro Atlanta and North Georgia, working directly with developers, investors, lenders and their design teams. Our full guide to industrial site development in Metro Atlanta covers zoning, stormwater and permitting in more depth.
Who we work with
- Industrial developers and owner-users scoping a warehouse, distribution or flex building.
- Investors and lenders underwriting an industrial acquisition who need engineering deliverables for diligence.
- Brokers with an industrial parcel under contract who need a written feasibility read.
- Contractors and site work firms who need a plan set that clears review in two cycles.
What kills industrial sites in due diligence?
In the order we see them:
- Detention that does not fit. Post development runoff on an industrial site is often three to five times the pre-development condition. If detention does not fit inside setbacks and buffers, the building shrinks or the deal dies. See our detention pond design guide.
- The buffer and setback stack. State waters buffers of 25 feet, local stream buffers of 50 to 75 feet, industrial to residential setbacks of 50 to 100 feet and truck court screening can take 30 to 50 percent of a small site.
- Utilities that were assumed. Water pressure, sewer capacity and three-phase power sufficient for the use are not guaranteed. Availability letters come before design.
- Topography. A 5 percent slope on a warehouse site means large cut and fill volumes and retaining walls, often $500,000 to $2 million on a mid-sized site.
- Truck access and traffic. Warehouses over roughly 100,000 square feet typically trigger a traffic impact study, and turn lanes or deceleration lanes can be required at the developer’s expense.
Every one of these is known before closing if the site is studied properly. None of them is cheap to learn afterward. See commercial due diligence and feasibility.
Zoning: get the letter before you close
Industrial development in Georgia runs on M-1 light industrial and M-2 heavy industrial districts with local overlays. M-1 generally covers warehouse, distribution, self-storage, indoor manufacturing, flex and screened contractor yards. M-2 covers heavy manufacturing, outdoor bulk storage and materials processing.
A parcel zoned agricultural, residential or general commercial means a six to twelve month rezoning with public hearings and no guarantee. Read what a zoning exhibit actually includes.
A written conforming use letter from the county, usually $0 to $200, removes the largest single risk on an industrial acquisition. It is the first thing we obtain.
Stormwater on an industrial site
The Georgia Stormwater Management Manual governs most Metro Atlanta jurisdictions and requires the design to meet water quality, channel protection, overbank flood protection, extreme flood protection and downstream analysis criteria. A warehouse site typically uses one or more of:
- Wet or extended dry detention for water quality treatment.
- Underground detention in concrete vaults or corrugated pipe where surface area is tight.
- Bioretention or grass channels along truck court perimeters.
- Oil and water separators at fueling, wash bay and loading dock areas.
- SPCC coordination where more than 1,320 gallons of oil is stored above ground.
Expanding an existing industrial parcel requires a comparison of grandfathered conditions against current thresholds to determine how much of the site must be brought to current standards. That analysis belongs in due diligence, not plan review.
Mack perspective: Mack Engineering is owned by a licensed general contractor, so an industrial plan set is drawn by people who have had to build from plans: where the haul road goes, which pad gets cut first, how the sediment basin becomes the permanent pond. Our sister company, Mack Development Group, is a licensed general contractor, which gives our engineers direct feedback from the field, and Mack Engineering provides construction management on the projects we engineer. Large footprint sites raise the same questions at a bigger scale; our data center civil engineering guide covers how early works grading, campus stormwater and utility corridors are phased.
What we do on an industrial site
- Feasibility and zoning verification with a written report tied to the purchase decision.
- Concept site plan: pad, truck court, car parking, circulation and detention, drawn to buffers and setbacks.
- Rezoning and variance exhibits and hearing support.
- Land disturbance permit plan set: grading, erosion and sediment control, stormwater, utilities, hydrology, retaining walls.
- NPDES Construction General Permit through Georgia EPD, concurrent with the LDP. See our guide to Georgia’s NPDES construction stormwater permits.
- Coordination of the traffic impact study and off-site road improvements with county DOT or GDOT.
- Construction administration through CO and as-built certification.
How long does an industrial site take to permit?
| Step | Typical duration |
|---|---|
| Zoning verification or rezoning | 0 to 12 months depending on starting zoning |
| Concept site plan and pre-submittal meeting | 2 to 4 weeks |
| Full LDP design | 6 to 12 weeks |
| LDP review | 45 to 120 days under SB 447 |
| Building permit | 30 to 60 days, concurrent or after LDP by jurisdiction |
Budget four to eight months from concept plan to LDP issuance on a straightforward M-1 site, and 12 to 18 months where rezoning, variances or off-site road improvements are involved.
What investors and lenders ask for
- ALTA survey with topography and utilities.
- Phase I environmental site assessment, and Phase II if conditions are identified.
- Geotechnical report with subgrade recommendations and infiltration testing.
- Conforming use or zoning verification letter.
- Utility availability letters for water, sewer, power and gas.
- Preliminary stormwater concept confirming detention feasibility.
- Traffic impact analysis where the threshold is triggered.
- Preliminary site improvement cost estimate.
We assemble this package during diligence so it is ready before the project goes to the capital markets.
Owner tip: Order the geotechnical borings where the cut is deepest, not on a grid. Rock at the wrong elevation on a warehouse pad is the single most expensive surprise on an industrial site, and a targeted boring program during due diligence costs a fraction of one change order.
Where industrial demand is moving in North Georgia
- Cherokee County: strong M-1 inventory along I-575; LDP review typically 45 to 90 days for a complete M-1 plan set.
- Forsyth County: tight industrial inventory and strong demand along GA 400; sketch plat and public hearing required at five acres in M-1.
- Hall County: expanding warehouse and distribution demand along I-985 with larger contiguous parcels.
How we work on industrial sites
Mack Engineering provides feasibility, stormwater concept design and full land disturbance plan sets for warehouse, flex and light industrial sites across North Georgia. The same engineer who runs the feasibility screen runs the plan set, so the truck court, the pad elevation and the detention footprint you see in the screen are the ones that get permitted.
Industrial sites raise the same questions as every commercial site we permit, at a larger scale: detention for a site that is mostly roof and pavement, a flat pad cut from sloping ground, utilities confirmed in writing before design, and an access point that satisfies the county and GDOT. Our medical office and recreation case studies show how we carry a commercial site from feasibility through the land disturbance permit; the method is the same on an industrial pad.
Frequently asked questions
M-1 light industrial in most jurisdictions. Some general commercial districts allow limited warehousing as a permitted or conditional use. Confirm with a written conforming use letter before closing.
Civil engineering fees for industrial sites of 5 to 30 acres in Metro Atlanta range from about $25,000 to $90,000 or more depending on acreage, stormwater complexity and utility coordination. A 10-acre warehouse site typically runs $40,000 to $65,000. Every fee is quoted to the parcel and the program.
Four to eight months from concept plan to LDP issuance on a straightforward M-1 site; 12 to 18 months with rezoning, variances or off-site road work.
Warehouses generating more than roughly 100 peak hour trips, about 100,000 square feet of warehouse or 50,000 square feet of manufacturing, typically do. The study is a separate deliverable we coordinate.
Partially. Grandfathered conditions are compared against current thresholds. Expansions over the local increment require full compliance for the increment and sometimes the whole site. It is a site specific analysis done in due diligence.
Underwriting an industrial site?
Send us the parcel and the building program. You get back zoning, detention feasibility, utility availability and the permit schedule on one exhibit before you commit.
Call (770) 715-7295 or contact Mack Engineering to schedule a feasibility conversation. Our office is at 5745 Stables Wy A-09, Alpharetta, GA 30004, and we serve Metro Atlanta and North Georgia.
This page is general information about civil engineering and permitting for industrial sites in Georgia. It is not a parcel specific permit determination, legal advice, or a cost estimate. Requirements vary by jurisdiction and change frequently; confirm current rules with the reviewing agencies and your engineer of record.