Permit Required? Required
Typical Fee Range $100–$300 Based on the estimated cost of construction with a minimum base fee.
Fee Method Valuation-based
Apply Online Apply at Building Division →

What's Required in St. Louis

  • Building permit required for all decks attached to a structure.
  • Structural plans showing footing depth, joist size, and beam spans.
  • Footings must reach a minimum depth of 30 inches (frost line).
  • Handrails required for all decks with 3 or more steps.
  • Guardrails must be at least 36 inches high for raised decks.
  • Ledger boards must be through-bolted or lag-screwed to the rim joist.

How to Get a Deck Permit in St. Louis

1

Step 1: Structural Design

Create scale drawings of the deck framing and foundation.

2

Step 2: Submit Application

Upload plans via the online portal or apply in person for Express Review.

3

Step 3: Plan Review

Building inspectors verify structural integrity and zoning setbacks.

4

Step 4: Permit Issuance

Pay valuation-based fees to activate the building permit.

5

Step 5: Inspections

Requires footing, framing, and final structural inspections.

Frequently Asked Questions

If the deck is over 50 sq ft and attached to the house, it requires a permit.
St. Louis code requires a 30-inch frost depth.
Yes, as an owner-occupant of a single-family home.