Deck Builderin Los Angeles, CA
Decks in a Los Angeles Very High Fire Hazard Severity Zone must use heavy timber, noncombustible or other approved material for boards, stair treads, risers and landings within 10 feet of the house, and no trellis may stand inside that 10 feet. Low platforms may be permit-exempt, but confirm the current rule with LADBS first.
A deck in Los Angeles can be a low platform off a Venice back door or a framed structure reaching out over a canyon slope above Sherman Oaks, and the City treats those two very differently. Height above grade, distance from the house and the overlays on the parcel decide the rules more than square footage does.
Our role on a deck is design, drawings, permit filing and site management; the footings, framing and boards are built by licensed subcontractors whose licenses you can look up on the CSLB site. The deck guide covers ledgers, guards, hold-downs and materials in depth, so this page sticks to what the City of Los Angeles adds. For the other overlays that can apply to the same lot, see how building works in Los Angeles.
LADBS deck rules for Los Angeles homes
Where decks permits come from in Los Angeles: Los Angeles Department of Building and Safety (LADBS).
- In a Very High Fire Hazard Severity Zone, decking, stair treads, risers and landings of decks, porches and balconies within 10 feet of the primary structure must be heavy timber, noncombustible or other approved material. No trellis is permitted within 10 feet of the primary structure.
- Applying an approved coating to an existing exterior balcony or deck is on the LADBS express list. Framing repair on the express list excludes decks.
- The 2025 City Clerk copy of the LAMC 91.106.2 amendment lists platforms not more than 30 inches above grade and not over a basement or story below as exempt from a building permit. Confirm the current edition with LADBS.
- In an HPOZ, exterior alterations including landscaping and additions are subject to extra review by City Planning.
What boards are allowed on decks within 10 feet of a house in a Los Angeles fire zone?
The LADBS plan check list for Very High Fire Hazard Severity Zones applies the 10 foot rule above to decks, porches and balconies alike, and it covers the stairs as well as the walking surface. In practice the first 10 feet off the back door is where the material decision gets made.
There are two common ways to design around it. One is a noncombustible landing, or a tile or concrete patio at grade, for the first 10 feet, with wood or composite beyond it. The other is a product the plan checker accepts as approved material for the whole deck. Either way, get the board's fire listing in writing before ordering, because a composite board is not approved just for being composite.
The trellis ban surprises people more than the decking rule. A shade frame bolted to the house is the classic design, and in these zones it is exactly what the list rules out within 10 feet, so ask LADBS whether your pergola counts as a trellis or set it farther out. Planters and climbing plants along the deck also fall inside the 200 foot brush clearance area LAFD expects the owner to keep to code all year.
Which decks can skip a building permit in the City of Los Angeles?
Possibly a low one, and only after you confirm it. The City Clerk copy of the code amendment in the rules block suggests a platform no more than 30 inches above grade may be exempt, but that copy was not confirmed as the adopted text, so ask LADBS before relying on it. A deck attached to the house, or one that serves a door, raises questions a freestanding platform does not.
An exemption from the building permit does not exempt the deck from anything else. Zoning setbacks, the fire zone materials and HPOZ review apply to the finished deck however it was permitted, and a buyer's inspector will look at it either way.
Deck repair in Los Angeles and plans drawn in other cities: what LADBS treats differently
Repairs are narrower than people expect. The LADBS express list includes framing repair, but decks are carved out of that item, so rebuilding rotted joists is not covered by it; ask which review path applies before the boards come up. Recoating an existing deck or balcony with an approved coating is an express item, which helps with waterproofing jobs that stop short of the framing.
Neighboring cities write their own rules. A deck drawn for a house in Beverly Hills, Culver City or West Hollywood has to be checked again against LADBS before it is built in Los Angeles.
What does a deck builder do differently on a Los Angeles hillside?
On a slope the deck becomes a foundation project. Posts get taller, every footing lands on the hillside, and the only access for concrete and lumber may be one stair from the street. Where a deck needs cut slopes or a retaining wall beneath it, the Baseline Hillside Ordinance limits on grading for single family Hillside Area lots come into play, and ZIMAS shows whether the lot is covered.
Working hours shrink as well. In Hillside Construction Regulation areas, which City Planning lists as Bel Air, Beverly Crest, Laurel Canyon, Kirkwood and the Bird Streets, outdoor work ends at 6:00 PM on weekdays, Saturdays are for interior work only, and flood lighting is not allowed after 6:00 PM. A schedule written for a flat lot in Tarzana needs more working days on one of these streets.
Fire and slope often come together on the same parcel. A deck over a brushy canyon in a Very High Fire Hazard Severity Zone meets the 10 foot surface rule at the house end, and the ground under it falls inside the clearance LAFD enforces, so plan how anyone will reach that ground to keep it cut once the deck is built.
Ask for the footing plan and the access plan together; on a steep lot one decides the other.
Building decks on an HPOZ house or an older Los Angeles home
In a Historic Preservation Overlay Zone, City Planning gives exterior alterations, landscaping and additions extra review, so a new rear deck in Highland Park-Garvanza goes through the district's process even if it sits close to the ground. Show the planner the deck's footprint, railing design and materials at the drawing stage, when changes cost nothing.
On an older house, the wall the ledger attaches to is the unknown. Opening the siding where the ledger goes shows whether the framing behind it is sound, and that answer can change both the price and the schedule, so the proposal should say how it will be handled.
Some deck plans grow into rooms. Once a deck gains a roof, walls and windows, it is no longer a deck project, and the comparison in room addition or ADU is the better starting point.
Deck details from Los Angeles houses
Three views of the framing, footings and surfaces behind a Los Angeles deck. Tap a photo to enlarge it.
What decks costs around Los Angeles
The deck price table puts a flat-lot deck in pressure-treated wood at $45 to $75 per square foot in Los Angeles and composite at $65 to $110, with a 16 by 20 foot wood deck around $14,500 to $24,000. Hillside decks have no sourced price: post height, footing count, engineering, fire zone materials and how the builders reach the slope decide it. The same lot often needs other work, so see concrete work in Los Angeles, fencing in Los Angeles and painting in Los Angeles. Deck permits and fire-zone materials are decided city by city; the Glendale building overview and the Pasadena building overview cover the two nearest.
| What it covers | Typical range |
|---|---|
| Pressure-treated wood deck | $45 to $75 per square foot |
| Composite deck | $65 to $110 per square foot |
| 16 by 20 foot wood deck (320 sq ft) | About $14,500 to $24,000 |
| 16 by 20 foot composite deck | About $21,000 to $35,000 |
| Hillside, second-story, rooftop and ipe decks | Priced by site visit |
| Permits and engineering | Quoted as separate lines |
Other work we manage in Los Angeles
Deck questions from Los Angeles homeowners
Can I build a composite deck in a Very High Fire Hazard Severity Zone in Los Angeles?
Yes, if the product qualifies as approved material for the part within 10 feet of the house. LADBS requires heavy timber, noncombustible or other approved material for the decking, treads, risers and landings in that band. Get the manufacturer's fire listing before ordering, and let the plan checker confirm it for your deck.
Can I put a pergola next to my house in a Los Angeles fire zone?
Not within 10 feet of the house if it counts as a trellis, because the LADBS plan check list for Very High Fire Hazard Severity Zones permits no trellis in that band. Ask LADBS whether your design counts as one, or place the structure more than 10 feet from the house.
Do I need a permit to repair rotted joists under my deck in Los Angeles?
Expect one, and do not expect the express path. LADBS puts framing repair on its express list but leaves decks out of that item, so deck framing repair needs a different route. Ask LADBS which review applies before the decking is removed, and keep the old framing visible for the inspector.
Can I recoat my balcony or deck without plan check?
Yes. Applying an approved coating to an existing exterior balcony or deck is on the LADBS express list, so the permit is issued without plan check. If the coating work uncovers soft or rotted framing underneath, stop and treat that repair as a separate permit question.
Does a deck in an HPOZ need City Planning approval?
Yes. City Planning subjects exterior alterations, including landscaping and additions, to extra review in a Historic Preservation Overlay Zone, and a new deck is an exterior alteration. Ask the HPOZ planner for your district to look at the drawings before they are final, since changes are cheaper on paper.
Are decks under 30 inches high exempt from a permit in Los Angeles?
It may be, but get LADBS to confirm it. The 2025 City Clerk copy of the LAMC 91.106.2 amendment treats platforms up to 30 inches above grade, and not over a basement or story below, as permit-exempt, yet its status as current code was not confirmed. Zoning, fire zone and HPOZ rules still apply to an exempt deck.
How much does a 16x20 deck cost in Los Angeles?
A flat-lot 16 by 20 foot deck runs about $14,500 to $24,000 in pressure-treated wood and $21,000 to $35,000 in composite, with permits and engineering extra. The 2025 Cost vs. Value report for Los Angeles prices a deck with bench, planter, steps and railing at $18,419 in wood and $26,872 in composite. Hillside decks have no sourced price.
How high can a deck be before it needs a railing in Los Angeles?
The California Residential Code requires a guard where the walking surface is more than 30 inches above grade within 36 inches of the edge. The guard must be at least 42 inches tall, with openings that stop a 4 inch sphere. We found no separate City figure, so ask LADBS whether the Los Angeles code changes any of these numbers.
Get a deck plan for a Los Angeles lot
Tell us the height off the ground, how close the deck sits to the house and whether the lot slopes. We check the fire zone, Hillside Area and HPOZ status before the site visit.