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Do I need a permit? A project-by-project checklist

Updated 2026-09-05 · 8 min read

Permit thresholds are local. Two neighboring municipalities can set different height, area, and value triggers for the same project. What is consistent is the logic behind the thresholds: authorities permit work that affects structure, life safety, egress, energy performance, utilities, or land use. Use the patterns below to predict, then confirm with the issuing department.

Projects that almost always require a permit

These touch structure, life safety, or utilities, and are permitted in the overwhelming majority of jurisdictions.

  • Additions and any increase in conditioned floor area.
  • Structural changes — removing or altering load-bearing walls, beams, headers, or foundations.
  • New electrical circuits, service upgrades, and panel replacements.
  • New or relocated plumbing, and water heater replacement in most areas.
  • HVAC equipment replacement or new ductwork.
  • Decks above a threshold height, and any deck attached to the structure.
  • Detached garages and most habitable accessory structures.
  • Finishing a basement into living space.
  • Window and door openings that change size, and egress window installation.
  • Demolition, and any change of occupancy or use.

Projects that often do not require a permit

These are typically classified as maintenance or cosmetic — but thresholds vary, and a few authorities permit items on this list anyway.

  • Painting, wallpaper, and interior finishes.
  • Flooring replacement over an existing subfloor.
  • Cabinet and countertop replacement with no plumbing or electrical relocation.
  • Like-for-like fixture swaps.
  • Small sheds under a local area threshold, placed outside setbacks.
  • Fences below a height threshold, though many authorities still require a zoning permit.

The four questions that predict a permit requirement

Before you assume a project is exempt, run it through this filter. If the answer to any of them is yes, plan on a permit until the department tells you otherwise.

  • Does the work change structure, load paths, or the building envelope?
  • Does it add, move, or modify electrical, plumbing, mechanical, or gas?
  • Does it change egress, fire separation, or occupancy?
  • Does it change the building footprint, height, or its relationship to setbacks and lot coverage?

Zoning approval is a separate question

A project can be exempt from a building permit and still require zoning approval — fences, sheds, driveways, signs, and accessory dwelling units are common examples. Zoning governs where and how large; building code governs how it is built. Confirm both.

How to confirm without guessing

Call or email the building department with a one-paragraph scope of work and the property address, and ask two questions: does this scope require a permit, and does it require zoning approval. Keep the written answer. If you would rather not chase it, Permit Junkie can build a project checklist from your scope and available authority records, and clearly labels anything that still needs confirmation with the department.

Get your documents reviewed before you submit

Upload your plans and application. Permit Junkie flags the gaps a reviewer would likely cite, explains each one, and assembles a submission-ready packet. Available nationwide.

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Frequently asked questions

Looking for a quick answer on deck permits, correction letters, or expediter fees? See the full permit FAQ.

Do I need a permit to build a deck?
Most jurisdictions require a permit for decks above a set height above grade and for any deck attached to the house. Ground-level detached platforms below the threshold are often exempt from a building permit but may still need zoning review.
Do I need a permit to build a fence?
Fences are usually governed by zoning rather than building code. Many authorities require a zoning permit above a height threshold, and most restrict height in front yards and near corner sight triangles.
Do I need a permit to build a garage?
Detached garages nearly always require a building permit, plus zoning review for setbacks, lot coverage, and height. Electrical service to the garage typically requires its own permit or inspection.
Is a permit required to finish a basement?
Yes in most jurisdictions. Basement finishes involve egress, ceiling height, fire separation, electrical, and often mechanical work — all core permitted items.

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