Imagine this scenario: A homeowner hires you to build an addition, and with permit in hand, you order the materials, hire subs, and start work. At the first inspection, with the foundation poured and the framing up, the code inspector says: "Nice foundation. Nice framing. But you're too close to the rear lot line. Our code requires that residences be no less than 20 feet away from the rear property line and you're within 15 feet. You've got to lose 5 feet of building there." And then he shuts you down. Along with creating a very bad day, this situation raises several legal questions: Does the building permit offer you any protection, and if not, why weren't you