Research by DoINeedAPermit Research Team · Updated May 2026
The Short Answer
Yes. Any attached deck in Aliso Viejo requires a building permit, regardless of size or height. California Title 24 and Aliso Viejo's local amendments make this non-negotiable.
Aliso Viejo enforces the 2022 California Building Code (CBC) and locally amends it through municipal code Chapter 18.68 and overlays that affect footing, flashing, and setback requirements. Unlike some Orange County cities that grandfather small freestanding decks under 200 sq ft and 30 inches, Aliso Viejo requires a permit for any deck—attached or freestanding—that connects to the house structure or exceeds 6 feet in any horizontal dimension. The City of Aliso Viejo Building Department requires plan submittal via its online portal (available through the city website) and triggers a mandatory plan-check review for ledger flashing compliance (IRC R507.9), footing depth relative to the lot's actual soil classification (not a generic frost-line assumption), and lateral-load connectors per IRC R507.9.2. Aliso Viejo's coastal properties (elevation 0–500 ft) fall under SRA (State Responsibility Area) and CAL FIRE code, which adds wind-uplift connector mandates (typically Simpson H-clips or equivalent). Hillside and canyon lots (elevation 500–1,500+ ft) trigger additional drainage and grading review because of expansive clay and winter water runoff. What sets Aliso Viejo apart from neighboring Mission Viejo or Laguna Niguel is its strict interpretation of ledger flashing as a life-safety item—missing or undersized flashing is the single most common plan-review rejection, often requiring a second submittal.

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

Aliso Viejo attached deck permits—the key details

Aliso Viejo requires a building permit for any attached deck under 2022 CBC Title 24 Sections 105.2 and 507, adopted locally via municipal code Chapter 18.68. The threshold is simpler than many jurisdictions: if the deck is attached (bolted or ledger-bolted to the house), you need a permit. Period. If the deck is freestanding and under 200 square feet AND under 30 inches above grade AND has no electrical, plumbing, or permanent roof, you are still exempt under CBC R105.2—but Aliso Viejo's Building Department will ask you to prove this in writing on a simple Exemption Declaration form (available on the city website). Do not assume a deck is 'small enough' to skip; submit the exemption form electronically and wait for written approval. Most homeowners misread the 200 sq ft rule and think 'my 12x15 deck (180 sq ft) is exempt'—they forget that the deck must also be freestanding, which means no bolts, brackets, or ledger board touching the house. Attached decks need permits. Frost-line depth is a critical requirement in Aliso Viejo's coastal zone (0–500 ft elevation), where frost depth is typically 0–6 inches in the sandy soils near the coast, but the code requires minimum 12 inches below undisturbed grade to account for seasonal settlement and water penetration. In the higher elevations (500–1,500+ ft) around Aliso Viejo's inland neighborhoods, soil is primarily expansive clay and granitic foothills, and frost depth jumps to 12–18 inches; your engineer or contractor must verify the actual soil classification via a geotechnical report or reference the city's published soil map (available through Orange County Assessor or the city GIS portal).

Ledger flashing is the single most critical code requirement and the #1 reason for permit rejections in Aliso Viejo. IRC R507.9 mandates that the ledger board be bolted to the band board (rim board) of the house with lag bolts or through-bolts spaced 16 inches on center, and flashing must be installed BEHIND (under) the house's exterior cladding or sheathing—not just on top. This means your contractor must remove siding, sheathing, or stucco, install through-bolts or half-inch lag bolts, and then install flashing per detail R507.9(1) or manufacturer specifications (e.g., ZIP System, Trex) that extend 4 inches up the house sheathing and 2 inches down over the ledger beam. Aliso Viejo's Building Department will not approve a plan that shows flashing applied after the fact, and inspectors will fail framing if flashing is not visible during the rough-framing inspection. If your house has stucco (common in Aliso Viejo), the flashing detail is even more critical because stucco does not shed water well; the city's plan-review team often requires a licensed stucco contractor to certify the flashing installation. Lateral-load connectors (DTT devices, typically Simpson Strong-Tie H-clips or equivalent) are required by IRC R507.9.2 to anchor the deck structure to the ledger and prevent the deck from pulling away in high wind. Aliso Viejo's coastal and SRA properties fall under CAL FIRE code and California Building Standards Commission (CBSC) directives that mandate wind-uplift connections for any structure within 5 miles of state/local jurisdiction fire zones—which includes most of Aliso Viejo's hillside and inland areas. Your plan must detail H-clips or mechanical fasteners rated for uplift (Simpson H2.5A minimum, or equivalents like Atas or UFP-TECH). This detail is almost always missing on homeowner-drawn plans and is a second reason for plan-review rejection.

Stair and ramp requirements follow IRC R311.7 and IBC Section 1015. If your deck is more than 30 inches above grade at any point, you must provide stairs with treads and risers meeting the following: riser height 7 inches ± 3/8 inch (so 6 5/8 inches to 7 3/8 inches), tread depth 10 inches minimum (from nose to nose), handrail on one side if the stair has 3 or more risers (on both sides if the stair is 36 inches or wider), and a handrail height of 34–38 inches. Many homeowners draw a 5-riser stair with 8-inch risers and 9-inch treads, and the plan fails review. Aliso Viejo's inspectors are strict about stair dimensions; if a plan shows a stringer angle of 40 degrees (typical for 7-riser, 10-inch tread stairs) and the actual rise/run math doesn't work out, the inspector will flag it as non-compliant and require a revised plan. If the deck is only 24–30 inches above grade, stairs must still be provided unless the deck has a ramp at a 1:12 slope (1 inch rise per 12 inches run) with a 5-foot landing at the bottom. Guardrail height is 36 inches measured from the deck surface to the top of the rail (some jurisdictions, like Laguna Beach, require 42 inches—confirm with your city). The guardrail must be 'child-safe' with no openings larger than 4 inches (sphere rule per IBC 1015.2) to prevent a child's head from passing through. Vertical balusters (spindles) must be no more than 4 inches apart center-to-center, and horizontal rails (if open to the side) must also comply with the 4-inch rule. This is a common issue: homeowners want wide railings for views, but code won't allow them if the opening is larger than 4 inches.

Aliso Viejo's multiple HOA jurisdictions add a layer of approval that is separate from the building permit but often delaying. Most of Aliso Viejo's residential lots are under one of several HOAs (Aliso Viejo Community Assoc., Laguna Oaks, Moulton Meadows, etc.), and the HOA requires Architectural Review approval before or concurrent with the building permit. HOA approval typically takes 2–4 weeks and may impose restrictions on deck materials (e.g., no composite deck boards in some neighborhoods to preserve a cohesive appearance), color (earth tones only), or setbacks (decks must be 10 feet from property line in some HOAs vs. 5 feet in city code). The building permit process does not check HOA approval—you must submit to the HOA separately. If you get a permit but skip HOA approval, the HOA can force removal of the deck after it's built, leaving you with a partially-completed and non-compliant structure. Verify your HOA rules before the first submittal; contact your HOA or check your CC&Rs (Covenants, Conditions, and Restrictions) document.

Timeline and fee: Aliso Viejo's permit is typically 3–4 weeks from first submittal to approval (not including HOA review). The city charges a base permit fee of $150–$300 plus a plan-review fee of $100–$200 and a final inspection fee of $50–$100, for a total of $300–$600 depending on deck valuation. Valuation is calculated as 'cost of construction'—a simple wood deck at $15–$25/sq ft, composite at $25–$35/sq ft. A 12x16 deck (192 sq ft) in pressure-treated pine at $20/sq ft is valued at $3,840, triggering a permit fee of roughly $200 (5% of valuation) plus plan review ($150) and final inspection ($75) = $425 total. Three inspections are typically required: (1) footing pre-pour (to verify hole depth, width, and soil classification), (2) framing/ledger (to verify flashing, bolts, and structural connections), and (3) final (guardrail, stairs, overall). Each inspection is scheduled separately and must be passed before the next phase begins. If the inspector finds a deficiency (e.g., ledger flashing not installed), you get a 'No-Pass' notice and must re-schedule the inspection after corrective work. This can add 1–2 weeks to the timeline if mistakes are caught late.

Three Aliso Viejo deck (attached to house) scenarios

Scenario A
12x16 attached wood deck, 3 feet above grade, full stairs, rear yard, Aliso Viejo lowland neighborhood (coastal zone, sandy soil, no HOA)
You're building a 192 sq ft attached deck off the back of your single-story home in one of Aliso Viejo's lower neighborhoods (elevation 100–300 ft, sandy coastal soils). The deck will be 36 inches above grade at the house attachment point (6-inch footing hole below finished grade, 30-inch piers to the deck surface), with a 5-riser staircase descending to the yard. The deck will not include electrical or plumbing. Because the deck is attached (bolted ledger to the house band board), you need a building permit regardless of size. The frost-line depth for your sandy coastal soils is typically 0–6 inches, but CBC R507.8 requires a minimum 12 inches below undisturbed grade (code is conservative for seasonal settlement), so your contractor will dig 12-inch-deep holes with 12-inch-diameter Sonotubes or frost-protected shallow foundation (FPSF) per R403.3. Ledger flashing is your biggest hurdle: if your house has stucco (common in Aliso Viejo), the contractor must remove stucco, install bolts through the band board, and install galvanized or stainless-steel flashing (e.g., Trex ledger flashing, 15 mil minimum) behind the stucco line, extending 4 inches up and 2 inches down. The plan must show a 1/4-inch half-inch lag bolt or through-bolt every 16 inches, Simpson H2.5A clips (or equivalent) at each ledger post, and guardrail details showing 36-inch height and 4-inch balusters. Your 5-riser staircase must show 7-inch risers and 10-inch treads (minimum); if your deck is 36 inches high and you have a 5-riser stair, each riser is 36 ÷ 5 = 7.2 inches, which is within tolerance. A handrail on one side is required (since the stair has 3+ risers); if the stair is wider than 36 inches, a handrail on both sides is required. Plan review takes 2–3 weeks; you'll likely get a first-round comment requesting ledger flashing detail clarification or asking for a geotechnical report to confirm soil (some inspectors are conservative and want soil confirmation even in typical coastal areas). Once approved, footing inspection happens before pouring concrete, framing inspection after ledger and rim are bolted and flashing installed, and final inspection after guardrail and stairs are complete. Total timeline: 4–5 weeks. Total cost: permit $200–$250, plan review $150–$200, inspections $100–$150, footing/framing labor $2,000–$3,500, materials $3,000–$5,000 (wood deck, hardware, flashing, stairs). Total project cost: $5,500–$9,000.
Permit required (attached deck) | Ledger flashing critical (stucco removal/reinstall) | 12-inch frost depth minimum | H2.5A wind-uplift clips required | 5-riser stair (7-inch risers, 10-inch treads) | 36-inch guardrail, 4-inch balusters | Footing, framing, final inspections | 4–5 week timeline | $300–$600 permit fees | $5,500–$9,000 total project
Scenario B
10x14 composite deck, 18 inches above grade, no stairs (ramp at 1:12), hillside lot, HOA-controlled neighborhood, expansive clay soil
Your lot is in one of Aliso Viejo's hillside neighborhoods (elevation 600–1,000 ft, expansive clay soils, HOA with Architectural Review). The deck is smaller (140 sq ft composite) and lower (18 inches above grade at the attachment point), so it feels like it might not need a permit—but it's attached, so it does. The 18-inch height is below the 30-inch threshold for guardrails, but you still need ledger flashing and proper footing. Because the deck is under 30 inches, stairs are not required; instead, you must provide a ramp at a maximum 1:12 slope (1 inch rise per 12 inches horizontal run), which means for an 18-inch rise, you need at least a 18 × 12 = 216-inch (18-foot) ramp. Most homeowners can't accommodate an 18-foot ramp, so they use stairs instead, which trigger handrails and the IRC R311.7 requirements. If you build the ramp, it must be 36 inches wide minimum, have a 5-foot landing at the bottom, and be slip-resistant (e.g., composite with grip-tape or pressure-treated wood with 40-grit sandpaper). Composite deck boards (Trex, Azek, etc.) are pricier than pressure-treated wood ($25–$40/sq ft vs. $15–$20/sq ft) and are heavier (2–3 lbs/sq ft vs. 2.5 lbs/sq ft), so your joists and beams must be sized for the added load. The plan must show joist sizing per span tables (e.g., Appendix D of the DCA, Deck Construction Authority, or IRC R502) and ledger bolting at 16 inches on center. Hillside soil in Aliso Viejo is typically expansive clay, which has poor bearing capacity and shrinks/swells with moisture changes; a geotechnical report is often required to confirm footing depth and bearing pressure. Frost depth in the hills is 12–18 inches, so footings must go at least 18 inches below the highest anticipated water line. The HOA in your neighborhood (e.g., Moulton Meadows or Laguna Oaks) may restrict composite colors to earth tones only and may require approval before you file with the city. Plan: submit HOA application first (2–3 weeks), then submit building permit (3–4 weeks for plan review, which will include a comment requesting geotechnical report if the plan doesn't show soil classification). Footing inspection, framing inspection, final inspection. The geotechnical report adds 1–2 weeks and $500–$1,000 to the project. Total timeline: 8–10 weeks (including HOA review). Total cost: HOA architectural review $0–$50, geotechnical report $500–$1,000, permit $250–$350, plan review $150–$200, inspections $100–$150, footing/framing labor $1,500–$2,500, composite deck materials $3,500–$5,600 (140 sq ft at $25–$40/sq ft). Total project cost: $6,500–$10,450.
Permit required (attached deck) | HOA approval required separately (2–3 weeks) | Composite deck boards (heavier, pricier than wood) | Hillside soil (expansive clay, geotechnical report likely needed) | 18-inch frost depth minimum | Ramp at 1:12 slope (or stairs with handrails) | No guardrail required (<30 inches) | Footing, framing, final inspections | 8–10 week timeline (including HOA) | $400–$600 permit + review + inspection fees | $6,500–$10,450 total project
Scenario C
8x10 attached deck, 2 feet above grade, no stairs, includes 20-amp outdoor circuit and gas line stub, waterfront neighborhood (SRA/CAL FIRE zone, sandy soil, no HOA)
You're building a small 80 sq ft attached deck near the waterfront in Aliso Viejo's southern neighborhoods (coastal zone, SRA, CAL FIRE jurisdiction, sandy soils). The deck is only 24 inches above grade, so no guardrail is required if you build it as a platform (railings only required above 30 inches per IBC 1015.1). However, you want to add a 20-amp GFCI outlet for an outdoor fan/light and a 1/2-inch gas line stub for a future grill. These utilities trigger additional permitting: electrical work requires an electrician's permit and NEC 680 compliance (if near water) and NEC 210/215 requirements for GFCI protection within 6 feet of the deck surface. Gas work requires a separate gas permit and Title 24 (California Energy Code) compliance. The deck itself needs a building permit (ledger flashing, footing, structural); the electrical work needs a separate electrical permit (filed by the electrician); the gas work needs a separate mechanical/gas permit. Do not roll electrical and gas into the deck permit—Aliso Viejo requires separate permits for each trade. The deck plan shows the ledger bolting, footing depth (12 inches for coastal sandy soil), H2.5A wind-uplift clips (required in SRA), and a ramp detail (if guardrails are omitted, a ramp at 1:12 is suggested but not strictly required for a 24-inch platform if no traffic is expected). The electrical contractor submits an electrical permit showing the GFCI outlet location (minimum 6 feet from the deck surface, or within 6 feet with GFCI protection per NEC 210.8), conduit routing, and breaker capacity (must come from a dedicated 20-amp breaker in the main panel). The gas contractor submits a gas permit showing the 1/2-inch stub location, depth (buried gas lines must be 24 inches deep in normal soil, 30 inches in areas with potential frost heave), and shut-off valve access. Three separate permit reviews: (1) building for the deck (2–3 weeks), (2) electrical (1–2 weeks), (3) gas (1–2 weeks). Best practice: submit all three simultaneously to the city portal. Inspections: (1) footing pre-pour (building), (2) framing and ledger (building), (3) final (building and electrical), (4) gas rough-in (gas), (5) gas final. Electrical final is typically done concurrently with building final. Total timeline: 4–6 weeks (all permits running in parallel). Total cost: building permit $150–$250, electrical permit $100–$150, gas permit $75–$100, plan review (all) $150–$200, footing/framing labor $800–$1,500, materials $1,500–$2,500 (deck), electrical rough-in $400–$800, gas stub $300–$600. Total project cost: $3,700–$6,600.
Permit required (attached deck) | Three separate permits (building + electrical + gas) | SRA/CAL FIRE zone (H2.5A wind-uplift clips mandatory) | 20-amp GFCI outlet (NEC 210.8 compliance, licensed electrician required) | Gas line stub (1/2 inch, 24-inch burial depth, shut-off valve) | No guardrail (<30 inches), ramp recommended | Footing, framing, electrical final, gas inspections | 4–6 week timeline (parallel permits) | $325–$500 total permit + review fees | $3,700–$6,600 total project

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Ledger flashing in Aliso Viejo: why it fails inspection and how to get it right

Lateral-load connectors (Simpson H-clips, DTT devices, or equivalent) are required by IRC R507.9.2 and are mandatory in Aliso Viejo's coastal and SRA zones under CAL FIRE code. These metal clips connect the ledger board to the house band board in a way that resists uplift and lateral wind forces, preventing the deck from racking or pulling away during high winds. A typical H2.5A clip (Simpson brand, or equivalent from Atas or UFP-TECH) is bolted to the ledger and band board and resists 2,500 lbs of lateral force. You need one clip for every 2–4 feet of ledger (depending on deck load); a 12-foot ledger typically needs 3–4 clips. The detail must show the clip type, bolt diameter and spacing, and installation (typically lag bolts or machine bolts through the band board and into the ledger). If the plan doesn't show clips, it will be rejected with a comment: 'Lateral-load connectors required per IRC R507.9.2 and CAL FIRE mandate.' Do not assume clips are optional; Aliso Viejo enforces this strictly.

Frost depth, soil classification, and geotechnical reports in Aliso Viejo's varied terrain

The safest approach for hillside lots in Aliso Viejo is to assume expansive clay and over-engineer: dig footings 18–24 inches deep, use 12-inch Sonotubes or concrete piers, and rest the post on a concrete pad with a bit of foam or sand leveler under the post bottom to allow slight settling. Frost-protected shallow foundation (FPSF) per CBC R403.3(2) is an alternative that uses insulation above the footing to prevent frost heave; this is more expensive but allows shallower footings (10–12 inches) in high-frost areas. Verify which method is acceptable to the city before your contractor starts digging. In Aliso Viejo's coastal zone, frost depth is effectively non-critical (frost line is 0–6 inches and rare), but the code still requires 12-inch minimum for conservative design—stick with 12 inches and move on.

City of Aliso Viejo Building Department
Aliso Viejo City Hall, Aliso Viejo, CA (contact city website for current address and mailing address for permit submittals)
Phone: (949) 446-6200 ext. (Building Department direct line; confirm via city website) | Aliso Viejo Online Permit Portal (available through www.ci.aliso-viejo.ca.us/building or accessible via the city's PermitEase system)
Monday–Friday, 8:00 AM–5:00 PM (closed weekends and city holidays; confirm holiday schedule on city website)

Common questions

Do I need a permit for a small 8x8 attached deck in my backyard?

Yes. Any attached deck in Aliso Viejo requires a building permit, regardless of size. Attached means the deck is bolted or ledger-connected to the house. Even an 8x8 deck (64 sq ft) attached via a ledger needs a permit because it's a structural load on the house and must meet IRC R507 flashing and bolting requirements. The only exception is a completely freestanding deck (no connection to the house) that is under 200 sq ft, under 30 inches above grade, and has no electrical/plumbing—but the city will ask you to prove this via an Exemption Declaration form. When in doubt, submit the exemption form for written approval from the Building Department rather than assume it's exempt.

What is the frost-line depth in my Aliso Viejo neighborhood?

Coastal Aliso Viejo (elevation 0–500 ft): 12 inches minimum per code (actual frost line is 0–6 inches, but code is conservative). Hillside/inland Aliso Viejo (elevation 500–1,500+ ft): 12–18 inches. The city publishes a frost-depth map via the Orange County Assessor's GIS portal and may have a more detailed map on the city website. Contact the Building Department to confirm the exact depth for your lot number, or reference the published map. Footings shallower than the code frost depth will fail inspection.

My deck is only 24 inches high—do I still need a guardrail?

No. Guardrails are required only when the deck surface is more than 30 inches above grade (IBC 1015.1). If your deck is under 30 inches, guardrails are not required by code, but you may still want to include them for safety or HOA architectural reasons. Confirm your HOA's guardrail rules if applicable. If the deck is 30 inches or higher, a 36-inch guardrail (measured from deck surface to top of rail) is required, with balusters spaced no more than 4 inches apart (sphere rule per IBC 1015.2).

Can I build an attached deck myself, or do I need to hire a contractor?

You can build the deck yourself under California Business & Professions Code Section 7044 (owner-builder exemption). However, electrical work (outlets, lights) and gas work (gas line stubs) must be done by licensed electricians and gas fitters, not by owner-builders. The building permit still applies—you're just the permit-holder (owner) instead of the contractor-permit-holder. Your plan must be detailed enough for the inspector to verify code compliance (ledger flashing, footing depth, bolt spacing, guardrail height, stair dimensions). If you're uncertain about any of these details, hire a structural engineer to stamp the plan ($300–$800) or hire a licensed contractor to handle the design and build ($5,000–$10,000+).

How much does an Aliso Viejo deck permit cost?

Permit fees are typically $150–$300 (base permit) + $100–$200 (plan review) + $50–$100 (final inspection) = $300–$600 total. Fees are based on the declared valuation of the deck (cost of construction). A 12x16 wood deck (192 sq ft) at $20/sq ft valuation is $3,840, triggering a permit fee of roughly 5% ($192–$250). Composite decks are valued higher ($25–$40/sq ft), so a composite deck of the same size might cost more in permit fees. Call the Building Department to confirm the exact fee schedule for your project's valuation.

What is an HOA Architectural Review, and how does it interact with the building permit?

Many Aliso Viejo neighborhoods are controlled by an HOA (homeowners association) that requires Architectural Review approval before you can build an exterior structure like a deck. HOA approval is separate from the city building permit; you must submit to the HOA and the city independently. HOA review typically takes 2–4 weeks and may impose restrictions on materials, colors, setbacks, or size. The building permit will not be issued without HOA approval if your property is in an HOA neighborhood. Confirm your HOA rules and submit the HOA application first, then submit the building permit to the city. If you skip HOA approval and the HOA discovers the deck later, they can force removal even if the city has already approved and finalized the permit.

Why does the inspector reject my ledger flashing plan?

Common rejections: (1) flashing material not specified (need product name and gauge, e.g., 'Simpson galvanized ledger flashing, 26-gauge, model LUS26'); (2) flashing location vague ('behind the siding' is not enough—need a cross-section drawing showing exact position relative to the ledger, bolts, and house sheathing); (3) for stucco houses, no mention of stucco removal/reinstall (stucco must come off, flashing installed behind it, then stucco re-applied); (4) no detail showing bolts and H-clips together with flashing (all three must be clearly shown in one detail drawing). Submit a professional detail or copy the flashing manufacturer's installation guide directly onto your plan with annotations showing your specific house's cladding type (stucco, siding, brick) and the flashing location.

How long does the deck permit process take from start to final approval?

Typically 4–6 weeks for a standard deck: 1–2 weeks to prepare plans, 1–2 weeks to submit (if waiting for HOA approval), 2–3 weeks for city plan review, plus inspection scheduling (footing, framing, final = 3 separate site visits, typically 1 week apart or more if corrections are needed). If the inspector finds deficiencies (e.g., ledger flashing installed incorrectly), each correction and re-inspection adds 1–2 weeks. Plan for at least 4–5 weeks from first submittal to final approval, and longer (8–10 weeks) if HOA approval or geotechnical reports are required.

What happens if I pour footings shallower than the frost line and the deck settles?

The deck will heave or settle unevenly as the soil freezes and thaws in winter, causing the ledger connection to the house to crack, the joists to split, or the guardrail to become unsafe. If an inspector discovers shallow footings during inspection (or post-occupancy), a stop-work order may be issued and the deck declared unsafe. Homeowners have been forced to remove entire decks and re-pour footings at the correct depth ($2,000–$5,000 additional cost). The original permit fee (paid already) is lost, and a new permit for the corrected work must be filed and fees re-paid. Always pour footings at or below the code frost-line depth for your area.

Can I use pressure-treated wood with nails instead of bolts for my ledger?

No. IRC R507.9 requires the ledger to be bolted to the house band board with bolts (minimum 1/2 inch) or lag bolts spaced 16 inches on center. Nails do not provide sufficient pull-out resistance and will fail under wind or snow load. The inspection will fail if bolts are not shown in the plan and installed in the field. Do not use nails, screws, or adhesive alone—code requires bolts.

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 Aliso Viejo Building Department before starting your project.

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