Cited for Your Driveway or Paved Surface?
The City's Math Is Often Wrong.
Impervious surface violations are technically complex and require precise measurements. Cities routinely get the calculations wrong, and the burden of proof is entirely on them.
The Translation
“Your driveway, patio, or paved surface exceeds the maximum impervious coverage allowed in your zoning district. Remove the excess pavement.”
That the total impervious surface on your lot exceeds the specific percentage limit for your zoning district, calculated using the correct lot area and excluding any permitted exemptions like public sidewalks.
Top 3 Procedural Loopholes
The Measurement Error Defense
Impervious surface calculations require precise lot area measurements and accurate identification of every paved surface. Inspectors often use GIS estimates that are significantly inaccurate. A professional survey almost always produces a different — and often lower — impervious coverage number.
Permeable Paving Exemptions
Many ordinances exempt permeable or semi-permeable paving materials (gravel, pavers with gaps, permeable concrete) from impervious surface calculations. If any portion of your driveway uses these materials, that area should be excluded from the calculation.
The Pre-Existing Surface Defense
If the driveway or patio was in place before the current impervious surface ordinance was enacted, it is a legal non-conforming condition. The city cannot require you to remove a surface that was legal when it was installed.
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