I have a phone app and a long tape. Is that good enough to mark my lot lines?
Asked October 25, 2026
AI answer · not yet verified by a surveyor
You can measure your yard for your own planning, but you can't legally establish a boundary yourself [1].
- Phone GPS is typically accurate to several meters, far too loose for a property line.
- Tape measuring from a fence or curb assumes those features are on the line, which often isn't true.
- Legal weight: in every state, only a licensed land surveyor can perform a boundary survey that others (lenders, courts, permit offices) will accept.
Licensed surveyors use survey-grade GNSS, total stations and record research, and they tie their work to monuments and the legal description [2].
Measuring yourself is fine for rough garden or landscaping ideas. For fences, buildings, sales or disputes, hire a licensed surveyor in your state.
General information only. Answers here are not a survey or legal advice, and no one here can tell you where your boundary is. For your property, hire a licensed land surveyor in your state; for legal questions, a real-estate attorney.