The short answer

Living off the grid is legal in Texas. The rules you'll meet are about how each system is built: a septic system needs a permit, a large well may need a groundwater district's permit, a new house in some counties needs inspections, and connecting to a utility needs its approval. Leave the utility out, and the interconnection rules never apply.

PowerNo one, unless you connect

Interconnection rules start when you tie into a utility. Inside a city, its electrical rules apply.

WellYour groundwater district

Domestic wells on more than 10 acres that can't pump over 25,000 gallons a day are exempt from its permits.

SepticCounty or TCEQ

A permit and approved plan before you build, from the local authorized agent or the state.

HouseThe county, if it opted in

Outside city limits, building code inspections apply only where the county adopted them.

A modern metal-roofed farmhouse on Texas Hill Country acreage with a ground-mounted solar array, a large corrugated rainwater tank and a small battery shed, cedar and live oak trees around it

Who you answer to

There isn't one off-grid permit in Texas. Each part of the home has its own authority, and whether a rule applies often depends on whether you're inside a city, in its extraterritorial jurisdiction, or out in the county. The sections below take them one at a time.

Power: solar, batteries and the wiring

  • No utility, no interconnection agreement. The Public Utility Commission's rule says a customer has to apply and sign an interconnection agreement before connecting generation to a utility system. A system that never connects doesn't go through that process.
  • Who can do the wiring. Texas requires an electrician's license for electrical work, with an exemption for work on a home by the person who owns it and lives in it, unless a city ordinance specifically regulates that work. Inside city limits, expect a permit.
  • The code it's built to. The Texas Department of Licensing and Regulation adopted the 2026 National Electrical Code as the state electrical code from September 1, 2026.
  • Property taxes. Texas exempts from property tax the added value of a solar energy device built primarily to make power for use on site. Our property tax guide covers the form.

Water: rainwater and wells

Texas is unusually friendly to rainwater harvesting. The equipment is exempt from state sales tax, and a homeowners' association can't ban rain barrels or a harvesting system, though it can keep them off common areas and out of the space between the front of your house and the street, and ask for colors that match the home.

A tall galvanized rainwater storage tank beside a small stone-and-metal cabin in Central Texas, a gutter downspout feeding the tank and prickly pear cactus at its base
If you keep a city line as backup

A private system over 500 gallons with a backup water supply needs a backflow preventer or an air gap at the storage tank. The backup can connect only to the tank, not the house plumbing, and you have to tell the city or water system in writing. A potable system tied to a public supply has to be installed by a licensed plumber with a water supply protection endorsement.

For a well, groundwater districts set most of the rules, but state law limits them for small household wells: a district must exempt a well used only for a home or for livestock or poultry from its permit requirement if it's on more than 10 acres and can't produce more than 25,000 gallons a day, and it can't restrict that well's production. On smaller tracts, the district's own rules decide.

Sewage: the permit you can't skip

Under the Health and Safety Code, you need a permit and an approved plan to build, change, repair or operate an on-site sewage system, which the law defines as one handling no more than 5,000 gallons a day. Where a local government (a county, city, river authority or special district) is authorized by the Texas Commission on Environmental Quality, it issues the permit; elsewhere TCEQ does. Your county is the place to start asking.

The house itself

Inside a city, its building code and permits apply. Outside city limits, the state law that brings building code standards to new houses is Local Government Code chapter 233, and it applies only where the county's commissioners court has adopted it. Where a county has:

  • The code. A new single-family house or duplex must meet the International Residential Code, the 2008 edition or the one used in the county seat. In a city's extraterritorial jurisdiction, the city's code controls if it adopted one there.
  • Three inspections. At the foundation before the concrete, at framing and mechanical before drywall, and at completion, by a licensed engineer, a registered architect, a state-licensed inspector or an ICC-certified residential inspector you hire.
  • Notice, not approval. The county may require notice before you start and after the final inspection, but the law says it can't require prior approval or charge a fee to enforce the standards.
  • Owner-builders. Skipping the notice is a Class C misdemeanor, except for an individual who builds or acts as contractor on a house that will be their own primary residence.
  • Not covered. Manufactured homes and state-regulated modular homes aren't "new residential construction" under this law; they have their own state rules.

How much solar it takes

Off the grid, a system has to cover your worst month, not your average one. Using the average Texas home's use by month in 2024 and modeled output for panels at the best tilt in Austin, here's the solar it would take each month:

In Austin, January is the hardest month, just ahead of August: short days meet winter heating, and it takes about 10.7 kW, 23% more than the yearly average of 8.7 kW. In Houston, July is hardest at about 11.6 kW, with January close behind at 11.3. Then the battery has to carry the nights: the average home used about 38 kWh a day in January and 48 in July, plus enough reserve for cloudy days. Our panel calculator guide and battery guide go deeper.

The middle path

Many Texans who want independence from the grid end up with solar plus a battery while staying connected: the grid covers the worst months and the battery covers outages. That route goes through your utility's interconnection process and buyback rules, which our buyback guide compares. If you're building where power lines don't reach, the cost of running a line is the number to compare with an off-grid system; ask the utility for a quote.

How it works

Your estimate in three steps

  1. Enter your billYour ZIP code, your utility and last month's bill.
  2. See your estimateA yearly savings range based on your utility's rates and the sun where you live.
  3. Choose what's nextAsk for a quote call if you want real pricing, or just keep the number.

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Common questions

Is it legal to live off the grid in Texas?

Yes. The rules you'll meet cover how each system is built: a permit for a septic system, groundwater district rules for larger wells, county building code inspections where the county has adopted them, and utility interconnection only if you connect.

Do I need a permit for a septic system in Texas?

Yes. The Health and Safety Code requires a permit and approved plan to build, change, repair or operate an on-site sewage system, issued by the local authorized agent or, where there isn't one, by the Texas Commission on Environmental Quality.

Is rainwater harvesting legal in Texas?

Yes. Rainwater harvesting equipment is exempt from state sales tax, and a homeowners' association can't prohibit rain barrels or a rainwater harvesting system, though it can limit where they go and their color.

Do I need a permit for a water well in Texas?

It depends on your groundwater district. State law requires districts to exempt wells used only for a home or livestock on more than 10 acres that can't produce more than 25,000 gallons a day.

Do Texas counties have building codes?

Only where the county has adopted the standards in Local Government Code chapter 233. Then a new house in the unincorporated area must meet the International Residential Code and pass three inspections, but the county can't require prior approval or charge an enforcement fee.

How big a solar system do you need to live off the grid in Texas?

For a home using the Texas average, about 11 kW of panels in Austin to cover January, the hardest month, plus a battery for nights and cloudy days. Most off-grid homes cut their use well below average first.

This page summarizes state law; cities, counties and groundwater districts add their own rules. It is not legal advice. Sources: Health and Safety Code 341.042, harvested rainwater · Health and Safety Code chapter 366, on-site sewage disposal · Water Code 36.117, groundwater district exemptions · Property Code 202.007, rainwater and HOAs · Tax Code 151.355, water-related sales tax exemptions · Local Government Code chapter 233, subchapter F · Occupations Code 1305.003 · PUC: 16 TAC 25.211 (PDF) · U.S. EIA: monthly sales by state · European Commission JRC: PVGIS. Reviewed October 2026.

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