Do you need a permit to clear land in Williamson County, TN?
Sometimes yes, sometimes no, and the answer depends on three things: how much ground you disturb, which side of a city line you sit on, and whether the work is farming or development. The short version: the state cares at one acre, unincorporated Williamson County follows the same line, the City of Franklin cares at 10,000 square feet, and Brentwood wants a grading permit for nearly any clearing that moves dirt. We deal with these rules weekly on land clearing jobs across the county, and this guide is the plain-English version of what the ordinances actually say.
The three layers
| Layer | The trigger |
|---|---|
| State (TDEC Construction General Permit) | One acre or more of soil disturbance, or a smaller site inside a larger common plan of development. “Clearing” is named in the permit as a soil-disturbing activity. |
| Unincorporated Williamson County | Land Disturbance Permit at the same one-acre / common-plan trigger, plus any activity the county deems a threat to water or safety |
| City of Franklin | Grading permit once disturbance reaches 10,000 square feet, roughly a quarter acre |
| City of Brentwood | Grading permit for land-disturbing activity including clearing, stripping, grading, excavation and filling, unless a listed exemption applies |
Unincorporated county: the one-acre rule plus a tree catch
Outside the city limits, the county’s Land Disturbance Permit runs through the Williamson County Engineering Department. It costs $150 for a single residential lot, requires an erosion control plan sealed by a licensed professional, and stays valid for two years. Agriculture is exempt, and so is forestry work done under a state-approved timber management plan.
The catch most owners have never heard of: the county’s woodland protection standards look backward three years. Clear a wooded site first and apply to develop it later, and the development can be required to replant at 80 trees per acre disturbed. If there is any chance the property develops within a few years, the clearing plan and the development plan need to be the same conversation, which is exactly the kind of thing we flag on a site preparation walk-through.
Franklin: a quarter acre and a tree ordinance with teeth
Inside Franklin city limits the practical trigger is small. Disturb 10,000 square feet, and the city engineer wants a grading permit and a pre-construction meeting first. Franklin also runs the state construction stormwater program locally, so on bigger jobs the state paperwork goes through the city rather than Nashville.
Franklin’s tree rules matter even when the dirt rules do not. Trees on a normal single-family lot of an acre or less are yours to manage, but specimen trees, 24 inches in diameter and up, are protected on development sites and critical lots, and unauthorized removals are replaced at a punishing two-to-one ratio. When we clear inside Franklin, keeper trees get flagged before a machine starts, not after.
Brentwood: assume a permit until proven otherwise
Brentwood’s ordinance is the strictest baseline in the county: no land-disturbing activity that modifies grade, and the code names clearing outright, without a grading permit unless an exemption applies. The exemptions are narrow, things like one home site on gentle grade or recognized farm uses, and all of them evaporate at one acre. Any protected tree, six caliper inches and up, can come under planning commission review on development sites, and estate lots in the hillside overlay carry their own protections. It is a big part of why clearing work in Brentwood leans selective: keep the canopy, clear the understory, and keep the project on the right side of a picky code.
What this means for a typical job
- Fence rows, pasture reclaim and brush maintenance on farm ground: the agricultural exemptions were written for exactly this. Forestry mulching a grown-up fence line is farm maintenance, not development.
- A residential lot cleanup under the thresholds: usually permit-free, but measure honestly. A quarter acre inside Franklin arrives fast.
- Anything feeding a build: assume permits at every layer, get them before machines mobilize, and remember the state wants its paperwork roughly 30 days ahead.
The enforcement math settles the debate. Franklin can fine up to $10,000 a day for unpermitted development, the county stacks $50 to $5,000 per day and can lien the property, and every jurisdiction carries stop-work authority. The permit is a line item; the violation is a project killer. If you are staring at overgrown ground anywhere in Williamson County and want a straight answer on which rules your job actually triggers, call (615) 599-7550 and we will walk the property and tell you, free.