📋 Quick Facts — Deck Permit in St. Louis
| Detail | Info |
|---|---|
| Permit Required? | Yes — in most cases |
| Permit Type | Building Permit |
| Permit Office | City of St. Louis Building Division |
| Phone | (314) 622-3313 |
| Hours | Mon–Fri business hours |
| Online Portal | Apply Online |
| Fee / Timeline | Current Data |
|---|---|
| Deck Permit Fee | City of St. Louis is an INDEPENDENT CITY — completely separate from St. Louis County. Very different fees. City fees are among the lowest in the country. |
| Approval Time | Simple residential: 1–5 days. New online portal launched 2025. |
| NEC Edition (MO) | 2017 |
| Permit Authority | Local level. St. Louis example given as reference — varies by county. |
Do I Need a Deck Permit in St. Louis?
The short answer: almost always yes. REQUIRED for most deck additions over 200 sq ft or 30 inches above grade — and St. Louis is no exception. The City of St. Louis Building Division enforces building permit requirements for residential and commercial work.
✅ Work That Always Requires a Permit
- Attached deck over 30 inches above grade at any point
- Deck over 200 square feet (most jurisdictions)
- Deck attached to the structure of the house
- Deck with roof, pergola, or covered structure
- Deck with electrical (outlets, lighting circuits)
💰 Deck Permit Fees in St. Louis (2026)
Permit fees in St. Louis are set by City of St. Louis Building Division. Here's the current fee structure for deck work:
| Fee Item | Amount |
|---|---|
| Deck Permit | City of St. Louis is an INDEPENDENT CITY — completely separate from St. Louis County. Very different fees. City fees are among the lowest in the country. |
City of St. Louis is an INDEPENDENT CITY — completely separate from St. Louis County. Very different fees. City fees are among the lowest in the country.
* Fees may change. Always verify current rates with City of St. Louis Building Division at https://www.stlouis-mo.gov/government/departments/public-safety/building.
🔍 Inspection Requirements
After the permit is issued, St. Louis requires inspections at key stages. Do not cover work before it's inspected.
- Footing Inspection: Inspector verifies hole depth reaches below frost line, correct diameter, and placement before concrete is poured.
- Framing Inspection: Inspector checks ledger board attachment, joist hangers, post sizing, beam sizing, and connection hardware.
- Final Inspection: Guardrail height and spacing (4-inch balusters, 36-42 inch rail height), stair rise/run, all fasteners in place.
📝 How to Apply for a Deck Permit in St. Louis
- Verify your contractor is licensed — Licensed General Contractor or specialty contractor. Homeowner can pull in most jurisdictions for owner-occupied single-family homes..
- Gather required documents — Equipment specs, site plan, load calculations where applicable.
- Submit the application — Online at City of St. Louis Building Division or in person.
- Pay the permit fee — City of St. Louis is an INDEPENDENT CITY — completely separate from St. Louis County. Very different fees. City fees are among the lowest in the country..
- Post the permit — Keep a copy on-site until all inspections pass.
- Schedule inspections — Do not cover work until the inspector signs off.
📌 Missouri State Requirements
In addition to St. Louis's local rules, these state-level requirements apply:
- Kansas City and St. Louis have own permit offices and stricter enforcement
- Most of Missouri is local jurisdiction — rural areas may have minimal enforcement
- Missouri HVAC Authority: missourihvacauthority.com for HVAC license info
🚫 Common Deck Permit Mistakes in St. Louis
- Not opening footing holes for inspection before pouring concrete — major fail
- Ledger board attachment not properly flashed — #1 deck failure point
- Using non-approved hardware (galvanized vs stainless in coastal areas)
- Guardrail balusters too wide — 4-inch sphere rule strictly enforced
💡 Pro Tips from Contractors
- Open footing holes for inspection BEFORE pouring concrete — this is the single most common deck inspection failure
- Submit complete plans upfront — missing ledger board details or footing depth is the #1 reason for permit delays
- In coastal or wet climates, use stainless steel hardware (hot-dipped galvanized minimum) — inspectors check this
- Check setback requirements from property lines before designing — some cities require 5-10 feet from property line
Notes specific to St. Louis:
- CRITICAL: City of St. Louis and St. Louis County are TWO SEPARATE JURISDICTIONS. Most suburbs are in the county, not the city.
- City of St. Louis fees are very low — HVAC ~$105, electrical $85, plumbing $90
- Mechanical fees are flat per-unit: furnace $40, condensing unit $40 each
- Building permit for projects over $3,000: $10 per $1,000 + $25 application fee
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Run a Free Permit Check →❓ Frequently Asked Questions
Do I need a deck permit in St. Louis, MO?
Yes, in most cases. REQUIRED for most deck additions over 200 sq ft or 30 inches above grade. In St. Louis, contact City of St. Louis Building Division at https://www.stlouis-mo.gov/government/departments/public-safety/building.
How much does a deck permit cost in St. Louis?
In St. Louis: City of St. Louis is an INDEPENDENT CITY — completely separate from St. Louis County. Very different fees. City fees are among the lowest in the country.. Fees may change — always confirm with City of St. Louis Building Division before applying.
How long does a deck permit take in St. Louis?
Simple residential: 1–5 days. New online portal launched 2025.. Simple residential trade work is often issued same-day or within 1–3 business days.
Who can pull a deck permit in Missouri?
Licensed General Contractor or specialty contractor. Homeowner can pull in most jurisdictions for owner-occupied single-family homes.