Every year, thousands of Los Angeles construction projects are delayed � sometimes by months � due to avoidable permit mistakes. Whether you're a homeowner doing a renovation or a contractor managing a commercial project, these are the most common errors we see and how to avoid them.
Mistake 1: Not Getting a Permit at All
The most expensive mistake. Unpermitted work in LA can result in stop-work orders, fines, required demolition, and serious complications when selling your home. Los Angeles actively enforces permit requirements, and neighbor complaints or routine inspections can expose unpermitted work years later.
Mistake 2: Applying for the Wrong Permit Type
Applying for an express permit on a project that requires a regular plan check � or vice versa � wastes time and requires resubmission. Read our guide on Express Permit vs Plan Check to understand which applies to your project.
Mistake 3: Incomplete Applications
Missing documents are the #1 cause of permit rejections. Common missing items include:
- Structural calculations or details
- Manufacturer spec sheets for equipment
- Energy compliance forms (Title 24)
- Signed and stamped plans (when required)
- Site plan showing property lines and setbacks
Mistake 4: Misunderstanding the 10% Rule
Adding square footage, increasing building height, or expanding a structure beyond 10% of its current size triggers a full plan check regardless of what other work is being done. Many homeowners don't realize a small addition pushes their project into regular permit territory. See our full article on the 10% Rule.
Mistake 5: Ignoring the Same Size/Type Rule
Assuming that replacing anything qualifies as express � when in fact "same size and type" must be met precisely. Upgrading from a 40-gallon to a 50-gallon water heater, or changing from gas to electric, are different type/size replacements. Read more about the Same Size/Type Rule.
Mistake 6: Not Scheduling Inspections
Getting the permit is just the beginning. Work must be inspected at the required stages (rough-in, framing, final, etc.) before being covered or completed. Skipping inspections means LADBS can require you to open up completed work for inspection � an expensive mistake.
Mistake 7: Starting Work Before Permit Approval
In LA, you must have an approved permit in hand before starting work. "Applied for" is not the same as "approved." Starting work early can result in double fees, stop-work orders, and even permit denial. Don't take the risk � contact us to expedite your legitimate permit as fast as possible.