Research by DoINeedAPermit Research Team · Updated May 2026
The Short Answer
Any attached deck in Lee's Summit requires a permit. Even small attached decks trigger structural review because the ledger connection to your house carries load and must meet IRC R507.9 flashing details specific to Missouri's 30-inch frost depth.
Lee's Summit enforces a stricter standard than many Midwest cities: the city's building official applies IRC R507 (decks) with zero tolerance for ledger-connection shortcuts, and the 30-inch frost depth in Jackson County means footing depth is non-negotiable on inspection. Unlike neighboring Kansas City (which allows some owner-builder exemptions for decks under 200 sq ft), Lee's Summit requires a permit and plan review for ANY attached deck, regardless of size. The city's online permit portal requires plan submission before construction can begin — no over-the-counter permits for decks. Your ledger flashing detail must show ice-and-water shield under the rim board, with fasteners staggered per code, and footings must hit 30 inches minimum (the local frost line). This is enforced strictly because Missouri's loess soil (common in Lee's Summit) is prone to settling if frost-heave isn't respected. Plan review typically takes 2–4 weeks through the city's electronic system.

What happens if you skip the permit (and you needed one)

Lee's Summit attached deck permits — the key details

Lee's Summit Building Department enforces IRC 2018 (adopted by Missouri with local amendments). For attached decks, the critical regulation is IRC R507.9 — the ledger flashing requirement — which is a leading cause of rejection in the city's permit office. Your ledger board (the board bolted to your house) must be flashed with at least two layers of protection: ice-and-water shield (self-adhering membrane) on the rim band before the ledger is attached, and then a metal flashing cap over the top. Fasteners (bolts or screws) must be placed in a staggered pattern at 16 inches on center, per R507.9.2. This rule exists because water intrusion at the ledger is the single largest cause of deck-related wood rot and foundation damage — especially in Missouri's humid climate where freeze-thaw cycles are frequent. Lee's Summit inspectors will reject a plan if the ledger detail shows fasteners bunched, improper spacing, or missing flashing. Many homeowners and smaller contractors skip this step or do it wrong, which is why it tops the city's rejection list.

Footing depth in Lee's Summit must reach 30 inches below grade — the established frost line for Jackson County. This is enforced on the pre-pour footing inspection (typically the first inspection after the permit is issued). Posts must sit on footings (never directly on soil or concrete patio), and each footing must be below the frost line. If you dig to 24 inches (common in warmer states), the city inspector will flag it and require you to re-dig. Use concrete piers or bell-bottom footings, not just gravel. The reason is the loess soil in Lee's Summit — a silt-based soil that expands and contracts significantly with freeze-thaw cycles. Insufficient footing depth causes the deck to heave upward in winter, cracking the ledger connection and pulling fasteners loose. This is not discretionary; the city will fail the footing inspection if depth is short.

Guardrail height is 36 inches minimum, measured from the deck surface to the top rail, per IBC 1015.1. This applies to any deck more than 30 inches above grade. Lee's Summit does not have a local amendment raising this to 42 inches (unlike some jurisdictions), but if your deck is in a flood zone, additional requirements may apply — check with the city if you're near Longview Lake or a FEMA flood plain. Balusters (vertical spindles) must be spaced no more than 4 inches apart to prevent a 4-inch sphere from passing through. The guardrail must be able to withstand a 200-pound horizontal force without failure. These details are on the plan; the inspector will measure and test on the framing inspection.

Ledger-to-rim-joist connection requires hurricane ties or lateral load devices if your deck is wider than 12 feet or if you're in a high-wind zone (Lee's Summit is not, but Joplin-area storms happen). Use Simpson Strong-Tie DTT or equivalent connectors to tie the ledger band to the rim joist. This prevents the deck from separating laterally during high wind or an impact. The city's plan reviewer will call out if these are missing on a wide deck. For small decks under 12 feet wide, galvanized bolts at 16 inches on center are sufficient per R507.9.2, but fastener specification must be on the plan.

Stair and landing dimensions: if your deck includes stairs, the stringer (the angled board supporting the steps) must be properly engineered. Tread depth (the horizontal part of the step) must be at least 10 inches, and riser height (vertical step height) must be between 4 and 7.75 inches, per IRC R311.7. All risers must be uniform within 3/8 inch. Landings must be at least 36 inches deep and must have guardrails if they are more than 30 inches above grade. The city's plan reviewer will check stringer calculations and dimensions; under-sized stringers are a common rejection. If you're adding a ramp instead of stairs (for accessibility), the slope cannot exceed 1:12 (one inch of rise per 12 inches of run), and the ramp must have guardrails on both sides if it's elevated. These details must be shown in a site plan and elevation drawing.

Three Lee's Summit deck (attached to house) scenarios

Scenario A
12x14 attached deck, 4 feet above grade, rear yard, no utilities — ranch home in Colonial Hills neighborhood
You're building a 168 sq ft deck on the back of your ranch house in Colonial Hills (southwest Lee's Summit). The deck sits 4 feet above grade, so a guardrail is required. The ledger will attach directly to the rim joist of your house framing. This is a straightforward attached-deck project, but it triggers full structural review in Lee's Summit because the ledger connection is non-negotiable. You'll need a set of plans showing: (1) site plan with deck location and property lines; (2) deck framing plan (joists, beams, posts, ledger detail); (3) elevation drawing showing guardrail height (36 inches minimum) and stair dimensions (if applicable); (4) ledger flashing detail showing ice-and-water shield, metal flashing cap, and fastener spacing at 16 inches on center; (5) footing detail showing 30-inch depth (required for Jackson County frost line) and concrete specifications. The permit fee will be approximately $200–$350, based on a deck valuation of about $8,000–$12,000 (roughly $50–$75 per sq ft material + labor). Expect 3–4 weeks for plan review. Once approved, you'll schedule three inspections: footing pre-pour (inspector verifies 30-inch depth), framing (verifies ledger flashing, guardrail height, fastener spacing, joist spacing), and final (guardrail load test, overall compliance). You cannot start digging footings until the permit is issued and the footing pre-pour inspection is scheduled. Total timeline is typically 6–8 weeks from permit pull to final inspection.
Permit required | Plan review 3–4 weeks | Footing depth 30 inches minimum | Ledger flashing required (ice-and-water shield + metal cap) | Guardrail 36 inches | Three inspections required | Permit fee $200–$350 | Total project cost $8,000–$15,000
Scenario B
8x10 elevated deck with composite decking and stairs, 36 inches above grade, attached to home in Tan Bark neighborhood (near bluff)
Your deck in Tan Bark (south-central Lee's Summit, near rolling terrain) is smaller in area (80 sq ft) but elevated 36 inches — well above the 30-inch threshold — so structural review is mandatory. The higher elevation means heavier guardrail requirements and more critical footing design. Tan Bark has variable terrain (loess on top, karst limestone below in some areas), so the city building official may require soil investigation if you're near a sinkhole risk zone; ask the permit office upfront whether your specific address is in a karst-prone area. Your plan must show: site plan with deck elevation relative to grade; footing locations with soil-bearing capacity notation (if karst is a concern); beam-to-post connections rated for the deck loading (use Simpson Strong-Tie hurricane ties or equivalent per R507.9.2); guardrail with 4-inch balusters and 200-pound horizontal load rating; and stair stringer calculations (treads 10 inches minimum, risers 4–7.75 inches, all uniform within 3/8 inch). Composite decking has different fastening requirements than pressure-treated lumber — use corrosion-resistant fasteners rated for composite. The permit fee will be $250–$450 because the higher elevation and stair component add complexity to the plan review. The city's structural reviewer will scrutinize the stringer calculations; under-engineered stringers are a common rejection. Footing inspection is critical here: verify 30 inches depth AND (if karst is flagged) soil fill quality and compaction. Plan for 4–5 weeks review time due to possible soil questions. Three inspections apply: footing, framing, and final. Total timeline 8–10 weeks.
Permit required | Stairs require stringer calculations | Footing depth 30 inches minimum | Karst sinkhole check may be needed in Tan Bark area | Composite decking requires corrosion-resistant fasteners | Guardrail guardrail 36 inches with 4-inch balusters | Permit fee $250–$450 | Plan review 4–5 weeks | Total project cost $10,000–$18,000
Scenario C
16x18 attached deck with electrical outlet and hot tub pad, 28 inches above grade, owner-built on owner-occupied home in Bannister area
You're building a larger deck (288 sq ft) in Bannister (northeast Lee's Summit) and you want to power a hot tub and add an exterior outlet for a grill. This triggers TWO separate permits in Lee's Summit: the deck permit AND an electrical permit. The deck itself is over 200 sq ft, so a building permit is required; the electrical work requires a separate electrical permit ($100–$200 for outlet installation and conduit, plus NEC 406.4 compliance for GFCI protection on exterior outlets). Missouri allows owner-builders on owner-occupied homes, but YOU cannot pull the electrical permit yourself — you must hire a licensed electrician to design and pull the electrical permit, or hire a contractor who subcontracts the electrical work. The deck permit covers structure, guardrails, and ledger; the electrical permit covers the circuit, outlet location, GFCI protection, and conduit routing. The deck plan must show ledger flashing detail, guardrail (at 28 inches above grade, this is borderline — some jurisdictions waive guardrails under 30 inches, but Lee's Summit interprets the code strictly, so a guardrail is likely required here; confirm with the permit office). The hot tub pad must be a reinforced concrete slab if the deck frame supports it, or a separate ground-level pad; if it's deck-mounted, the deck structure must be engineered for the additional 2,000–5,000-pound load. This will likely require a structural engineer's stamp on the plan. Footing depth is 30 inches minimum. Permit fees: deck $250–$400, electrical $100–$200; total $350–$600. Plan review for the deck is 4–5 weeks, electrical review 1–2 weeks (often concurrent). You'll need footing, framing, and final inspections for the deck, plus rough and final inspections for electrical. Total timeline 10–12 weeks. Cost estimate: $15,000–$28,000 (deck structure $12,000–$18,000, electrical $800–$1,500, hot tub pad $2,000–$4,000).
TWO permits required (deck + electrical) | Owner-builder allowed for structure only; licensed electrician required for electrical | Footing depth 30 inches minimum | Guardrail likely required (under 30-inch threshold is borderline, confirm with city) | Hot tub pad requires engineering if deck-mounted | Electrical outlets require GFCI protection per NEC 406.4 | Deck permit $250–$400, electrical permit $100–$200 | Plan review 4–5 weeks | Five inspections total | Total project cost $15,000–$28,000

Every project is different.

Get your exact answer →
Takes 60 seconds · Personalized to your address

Lee's Summit frost depth and footing design — why 30 inches matters

Jackson County, Missouri sits in IECC Climate Zone 4A, with an established frost line of 30 inches below grade. This depth is non-negotiable in Lee's Summit because the city's soil is primarily loess — a windblown silt deposit from glacial epochs — which is highly susceptible to frost heave. When water in the soil freezes, it expands; if a deck's footings are shallower than the frost line, the frozen soil will push the post upward during winter, then drop it back down in spring. This heave-and-settle cycle cracks the ledger flashing, pulls fasteners loose, and can separate the deck from the house entirely. The city's building inspector will measure footing depth with a measuring tape on the pre-pour inspection and will FAIL the inspection if depth is short. Many homeowners assume 24 inches (common in warmer climates) is sufficient; it is not in Lee's Summit. You must dig to 30 inches and pour concrete below that depth. If your site has high water table (possible in lowlands near Longview Lake or Antioch Stream), the inspector may require a drainage layer or sump detail in the footing plan. Pressure-treated lumber is standard for posts; Grade B or better pressure-treated timber rated for ground contact is required. Never use untreated wood below grade.

Some properties in Lee's Summit (especially in the Tan Bark and south of I-470 areas) sit on karst terrain — limestone with sinkholes and cavities below the surface. If your property is flagged as karst-prone, the city may require a soil boring or geotechnical evaluation before footing design. This can add $300–$800 to your project and 1–2 weeks to the permit timeline. Check with the building department or the city GIS map to confirm whether your address is in a sinkhole-risk area. If it is, disclose this upfront on your permit application; hiding it leads to permit rejection later. Footing design in karst areas sometimes requires deeper piering or rock-anchor installation. This is uncommon but critical if your property is affected.

Footing size varies by beam loading and soil bearing capacity. A typical two-post deck (supports one beam) on Lee's Summit loess requires a footing hole diameter of 10–12 inches and 30 inches deep, with a concrete pad above grade (2–4 inches) to keep the post base above standing water. Posts are typically 4x4 or 6x6 pressure-treated timber. Your plan should specify post size, footing diameter, concrete strength (minimum 3,000 PSI), and depth. The inspector will verify depth with a measuring stick and will visually confirm concrete is solid and free of voids. If you live in a flood-prone area (Longview Lake zone, Antioch Stream floodplain), the city may require frost-depth footings PLUS additional flood-resistant measures; ask the permit office if your property is in a mapped flood zone.

Ledger flashing detail — the single most-rejected deck plan element in Lee's Summit

The ledger board — the horizontal board bolted to your house rim joist — is where 80% of deck water-damage claims originate. Water seeps behind the ledger, rots the rim joist, and eventually compromises the foundation. Lee's Summit inspectors enforce IRC R507.9 with zero tolerance because this is a life-safety and structural issue. Your plan must show a cross-section drawing (typically 1/4-inch scale or larger) of the ledger-to-rim connection with the following elements in order from outside to inside: (1) exterior siding or brick; (2) rim band or header joist; (3) ice-and-water shield (self-adhering membrane, typically Bituthene or equivalent, at least 9 inches tall, installed before the ledger is bolted on); (4) metal flashing cap (typically L-shaped aluminum or galvanized steel, extending up behind the siding and down over the top of the ledger); (5) bolts or fasteners (galvanized lag bolts or stainless screws, spaced 16 inches on center in a staggered pattern, never bunched at corners); (6) the ledger board itself (pressure-treated 2x rim board or bolted band joist); (7) the deck frame joists bolted or bolted to the ledger. Many contractors and homeowners miss step (3) — the ice-and-water shield under the ledger. They bolt the ledger directly to the rim without the membrane, and water seeps behind it. The city's plan reviewer will reject this. You MUST show the membrane in the detail drawing, and the inspector will observe it during the framing inspection (before the joists are attached) to verify it's in place.

Fastener spacing is 16 inches on center, in a staggered pattern. This means bolts are spaced 16 inches apart along the length of the ledger, and the pattern is offset so that fasteners on the top row don't align with those on the bottom row. This distributes lateral load evenly and prevents the ledger from tearing if the deck is subject to side loads or racking stress. A common mistake is bunching fasteners at the corners or in the middle, which concentrates stress and causes failure. The city's inspector will count and measure fastener spacing on the framing inspection. If spacing is wrong, the inspector will fail the inspection and require correction before final approval. Another common mistake: using nails instead of bolts. Nails have zero shear strength and will pull out under load. Use only galvanized lag bolts (minimum 1/2 inch diameter) or stainless steel structural screws (minimum 5/16 inch, Simpson Strong-Tie Strong-Drive or equivalent, torqued to specification). The plan must specify the fastener type and grade.

Metal flashing detail is equally critical. The flashing cap must extend at least 4 inches up behind your house siding and 1–2 inches down over the ledger board, creating a roof-like assembly that sheds water away from the wood. The flashing must be screwed or riveted to the ledger (not nailed — nails work loose over time), and it must be sealed at the vertical leg where it meets the house. Caulk the top edge with exterior-grade sealant (paintable silicone or acrylic). This detail is easy to miss in the field; many deck builders install flashing incorrectly or skip caulk. The inspector will check this on the framing inspection before you cover the ledger with trim or deck boards. If flashing is installed wrong, the inspector will require correction. Get a detail sheet from your plan reviewer or a flashing supplier (Fabral, Amerivent, or Simpson Strong-Tie all make deck flashing kits) to ensure you have the right profile and installation steps.

City of Lee's Summit Building Department
220 SE Green Street, Lee's Summit, MO 64063
Phone: (816) 969-6400 (main city line; ask for Building Department) | https://www.lsmo.com (navigate to Permits & Inspections or Building Department page for online permit portal link)
Monday–Friday, 8:00 AM–5:00 PM; closed weekends and city holidays

Common questions

Do I need a permit for a freestanding ground-level deck under 200 sq ft?

No — freestanding decks under 200 sq ft AND under 30 inches above grade are exempt under IRC R105.2, which Lee's Summit adopts. However, if the deck is attached to your house (even a small one), or if it's elevated more than 30 inches, a permit is required. The city treats any attached deck as a structural connection and requires permit review to verify ledger flashing compliance.

Can I pull the permit myself as an owner-builder in Lee's Summit?

Yes, you can pull the structural (deck) permit yourself if you own and occupy the property. However, if your deck includes electrical work (outlet, lighting, hot tub circuit), you must hire a licensed electrician to pull the electrical permit. Missouri allows owner-builders for structure but not for trades. Work with the city permit office to coordinate both permits.

What's the frost line in Lee's Summit, and why does it matter?

The established frost line in Jackson County is 30 inches below grade. All deck footings must reach this depth to prevent frost heave in winter. Lee's Summit's loess soil is prone to settling if footings are shallow, which can crack your ledger and separate the deck from your house. The city's inspector will measure footing depth on the pre-pour inspection and will fail the inspection if depth is short.

How long does plan review take in Lee's Summit, and can I get expedited review?

Standard plan review for a deck takes 3–5 weeks. Lee's Summit's online permit system requires electronic submission and batching with other applications. Expedited review is not typically available for decks, but you can submit plans early (before you're ready to break ground) to identify issues and resubmit faster. Some smaller projects may get over-the-counter review (same-day approval) if plans are simple and conform to a standard template; ask the permit office.

What if my deck is in a flood-prone area or near Longview Lake?

If your property is in a FEMA-mapped flood zone or in the Longview Lake watershed, the city may impose additional floodproofing or elevation requirements on your deck. Check the city's flood zone map or contact the Building Department to determine whether your address is in a flood hazard area. Flood-zone decks sometimes require elevated posts, reinforced connections, or additional anchoring per the International Flood Resistant Construction Code (IFRC).

Do I need a guardrail on my 28-inch-high deck?

The IRC threshold is 30 inches above grade for mandatory guardrails. At 28 inches, you're under the threshold, but Lee's Summit's building official may interpret the code conservatively and require a guardrail anyway for safety. Contact the permit office with your site plan and elevation drawing to confirm. If the deck is exposed to a steep drop-off or is in a high-traffic area, the inspector may mandate a guardrail regardless of the 28-inch height.

What are the typical inspection sequence and timeline for a deck permit?

After permit issuance, you'll schedule three inspections: (1) footing pre-pour (verifies 30-inch depth and concrete specs); (2) framing (verifies ledger flashing, guardrail height, fastener spacing, joist sizing, and stair dimensions if applicable); (3) final (verifies guardrail load rating, overall compliance, and electrical outlets if applicable). Allow 1–2 weeks between inspections for work. Total timeline from permit pull to final inspection is typically 6–10 weeks, depending on plan review time and inspection scheduling.

Can I hire any contractor to build my deck, or does Lee's Summit require a licensed contractor?

Missouri does not require a general contractor license for residential construction, including decks, but your contractor should carry liability insurance and proof of workers' compensation insurance. Lee's Summit does not restrict who can build decks, but the homeowner pulling the permit is responsible for ensuring work complies with the permit and passes inspections. If your contractor makes mistakes, you bear the cost of corrections. Use a reputable contractor with references and insurance.

My deck plan was rejected. What are the most common reasons, and how do I fix them?

Top rejection reasons in Lee's Summit: (1) Ledger flashing detail missing or incomplete (add ice-and-water shield and metal cap detail); (2) Footing depth shown below 30 inches (correct to 30 inches minimum for Jackson County); (3) Fastener spacing incorrect or not staggered (show 16-inch on-center staggered pattern); (4) Stair stringer calculations missing (provide engineer-stamped stringer plan for decks with stairs); (5) Guardrail height or balusters not labeled (specify 36-inch height and 4-inch baluster spacing). Resubmit the plan with corrections and a cover letter noting changes. Most resubmits are approved within 1–2 weeks.

Is karst terrain (sinkholes) a concern for deck footings in Lee's Summit?

Karst terrain is present in parts of Lee's Summit, especially south of I-470 and in the Tan Bark area. If your property is in a karst-prone zone, the city may require soil investigation before footing design. Check the city's GIS map or ask the Building Department whether your address is flagged for karst risk. If so, a soil boring ($300–$800) may be required, and footing design may require deeper piering or rock anchors. Disclose karst concerns early on your permit application to avoid delays.

Nearby cities & related guides

Deck (Attached to House) Permits in O'Fallon, MO Deck (Attached to House) Permits in Florissant, MO Deck (Attached to House) Permits in Chesterfield, MO
Disclaimer: This guide is based on research conducted in May 2026 using publicly available sources. Always verify current deck (attached to house) permit requirements with the City of Lee's Summit Building Department before starting your project.

Keep researching

Deck (Attached to House) permits in other Missouri cities
Other permits in Lee's Summit
Deck (Attached to House) permits in popular cities
Browse all