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Williamson County.
Williamson County is a patchwork of fast-growing cities such as Round Rock, Georgetown, Cedar Park, Leander and Hutto, each with its own code, plus utility districts and unincorporated land between them. The west side sits over the Edwards Aquifer.
Who governs what
Several offices hold part of the rulebook.
Which ones apply depends on exactly where the parcel sits. We confirm that first, from the source.
| Who | What they decide |
|---|---|
| City planning departments | Zoning, site plans, subdivision and building permits inside each city, and subdivision rules in its ETJ. |
| Williamson County | Subdivision, floodplain, septic and county roads on unincorporated land. |
| Williamson County Fire Marshal | Fire code review outside city limits. |
| Municipal utility districts and other providers | Water and wastewater from cities, special utility districts, MUDs and water supply corporations. District consent can be its own step. |
| Electric providers | Investor-owned utilities and co-ops split the county. Lead times differ. |
| TCEQ | Edwards Aquifer protection plans over the recharge and contributing zones in the west. |
| Habitat plans | Cave and karst species in parts of the county can bring surveys and a habitat plan into the path. |
| TxDOT | Access and permits on state highways and toll road frontage. |
The usual path
Approvals a typical project meets here.
A common order for a commercial or small multifamily project. Your parcel and plan can add or remove steps.
- 1
Confirm city, ETJ, district or county
Many parcels sit inside a MUD or near a boundary, and annexations move often.
- 2
Zoning, inside a city
Each city has its own use tables, overlays and design rules.
- 3
Plat or replat
Needed for unplatted tracts, splits and combinations. City or county review depends on location.
- 4
Utility service
Capacity and any district consent or utility agreement, plus a fire flow answer.
- 5
Environmental review
Edwards Aquifer plans and karst surveys where the site sits over sensitive geology.
- 6
Site plan and access
Drainage, landscaping, parking and driveway permits, with TxDOT on state roads.
- 7
Building and fire permits
Code editions differ between the cities and the county.
What most often matters
The local constraints we check first.
Which city, which code
Neighboring cities write different rules. The jurisdiction check comes first.
Jurisdiction guideDistricts and service areas
A MUD or district can control water and sewer for your site, and its consent can be a step of its own.
Water and wastewater guideKarst and the Edwards
Caves and sensitive features in the west can require surveys, setbacks and TCEQ plans.
Edwards Aquifer guidePower lead times
New transformers and line extensions can take months, and the provider sets the schedule.
Power guideToll roads and highways
Frontage access needs state review, and spacing can limit where the driveway goes.
Access guideFloodplain
Creeks across the county carry mapped floodplain. We compare FEMA and local maps for the site.
Floodplain guideGood to know
Things that catch people here.
General orientation, not advice for a specific site. Rules and maps change; confirm with the approving authority.
Annexation moves quickly here. Cities grow by annexation and agreement. Check the current boundary and any development agreement before relying on county rules.
Water rules vary by city. Some cities have adopted their own water quality rules on top of state rules. We read the code for the city that governs the site.
District consent is a real step. In a MUD, the district’s board may need to approve service or plans. That can add a meeting cycle.
We add places carefully. Williamson County is next on our list. Tell us about your site and it helps decide which cities we finish first.
Building here, or nearby?
Tell us the parcel and what you want to build. Requests from members decide where we go deeper next.
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