$45–$70/sqft pressure-treated; $80–$110 composite or IPE.

Do I need a permit for a low patio?

No if under 30in above grade and detached.

Los Angeles Decks & Patios

LA decks — backyard ground-level, raised, rooftop. Composite (Trex, TimberTech), redwood, and IPE. Engineer + LADBS permit on raised or attached.

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Scope of work.

Engineering + permit
Footings + posts
Framing + ledger
Decking + railing
Final inspection

What changes about this in Los Angeles.

Permit if attached or >30in above grade.
Engineer for hillside.
Guardrail + fall protection per code.

Los Angeles cost band — 2026

$45 – $110 / sqft

Pressure-treated bottom; composite + steel top.

Los Angeles timeline

2–4 weeks depending on size + height.

How we think about this work in Los Angeles.

Exterior work is moisture management, full stop. Roofing, siding, stucco, decks, and concrete all exist to move water away from the building before it has time to soak in. We detail every transition — roof-to-wall, wall-to-deck, deck-to-door — as if it will see a hose test, because in winter it will.

California climates are deceptively hard on exteriors. UV is brutal. Marine air corrodes fasteners. Wildfire embers land on debris in valleys. We default to WUI-compliant materials (Class A roofing, ⅛" mesh vents, ignition-resistant siding) on every exterior job, even where it's not yet required — it's $2–6K extra and it's the difference between a saved house and a lost one.

The schedule, written out.

Every project varies, but the cadence below holds for most decks & patios jobs in Los Angeles. We publish it on purpose — the schedule is the contract.

Week 0
Inspection + scope
Roof + flashing inspection, moisture probe of siding, deck post + ledger check, photo documentation.
Week 1–2
Permits + material procurement
Permit (most cities require for re-roofs, additions, decks > 30" off grade); material delivery scheduled around rain forecast.
Week 2–4
Tear-off + dry-in
Selective demo, sheathing inspection, replace rotted decking, install underlayment + flashing.
Week 4–6
Install
Roof, siding, stucco scratch + brown + finish, deck framing + decking, concrete forms + pour.
Week 6–7
Trim + paint + seal
Trim, paint, sealant on penetrations, deck stain or color.
Week 7–8
Inspection + warranty
Final inspection, manufacturer warranty registration, owner walk.

Materials & assemblies.

These are the defaults we write into the contract before you change a thing. They're the floor, not the ceiling — every spec can be upgraded; none should be downgraded without a serious reason.

Component	Default spec	Why
Roofing	30-yr architectural shingle, standing-seam metal, or single-ply TPO/PVC for low-slope	Standing-seam metal wins lifetime cost in most CA climates.
Underlayment	Synthetic underlayment + peel-and-stick ice-and-water at valleys and penetrations	30-lb felt is no longer the right baseline.
Siding	Fiber cement (Hardie), engineered wood (LP SmartSide), or stucco with weep screed and 2-layer WRB	WRB layering is what controls 90% of stucco failures.
Deck framing	PT lumber for posts, joists, ledger; stainless or coated fasteners; flashing at ledger	Galvanized fasteners on PT lumber corrode in 5 years.
Decking	Composite (Trex, TimberTech), thermally modified hardwood, or kiln-dried IPE with hidden fasteners	Composite is the lowest-maintenance default for CA sun.
Concrete	4000 psi mix, #4 rebar @ 16" o.c., proper expansion + control joints	Cracks come from poor jointing, not from the mix.

Hidden costs we flag up front.

A Los Angeles project budget that ignores the items below is a budget that will go over. We surface them in the first walk-through — not after a wall is open.

Line item	Range	When it hits
Sheathing replacement	$8–$22/sqft	tear-off reveals rot or delaminated OSB
Deck ledger flashing repair	$1.5K–$6K	ledger was nailed, not bolted with flashing
Stucco crack repair (full re-skim)	$6K–$18K	1980s synthetic stucco has reached end of life
Tree removal / overhead clearance	$1.5K–$8K	roof or wall access requires it
Permit (re-roof + structural)	$300–$2.5K	many cities now require for re-roof + decks

Why building in Los Angeles is its own thing.

Climate & building stock

Greater Los Angeles is a warm-summer Mediterranean climate (Köppen Csa) with long dry summers, Santa Ana wind events, brushfire exposure on the WUI, and an annual rainfall window concentrated between November and March. Building stock skews to single-story stucco bungalows, post-war ranches, and 1960s–80s wood-frame on raised perimeter or slab — many of which were built before today's Title 24 envelope and ventilation rules.

Seismic & soils

LA sits on the Newport-Inglewood, Santa Monica, Hollywood, and Sierra Madre fault systems. Soft-story apartments and pre-1980 cripple-wall single-family homes are the two biggest seismic liabilities; the Soft-Story Mandatory Retrofit Program (Ordinance 183893) is the framework most multifamily clients deal with, and FEMA P-50 / Brace+Bolt is the standard for single-family.

Code & amendments

City of LA uses the 2023 California Building Code / CRC / CMC / CPC / CEC + 2022 Title 24 Part 6, layered with LA-specific amendments and the LA Green Building Code. ADU rules follow LAMC §12.22 A.33 plus statewide AB 671 / SB 9 / SB 1211 updates current for 2026.

Jurisdictions we permit in

City of Los Angeles — LADBS (most of the basin)
LA County Public Works — Building & Safety (unincorporated)
Beverly Hills, Santa Monica, Culver City, Pasadena, Glendale, Burbank — independent building departments
Long Beach Development Services + South Bay coastal cities
Hillside Ordinance review for many Westside / Hollywood Hills parcels

Plan-check turnaround: 8–14 wk standard, 3–4 wk Express
Building-permit fee basis: ≈ 1.1–1.6% of valuation
School-facility fee (Level 1): $5.17 / sqft residential — 2026
Sewer-capacity charge: $3,800–$7,200 per new unit
Typical ADU all-in: $320K–$520K

What the city charges before we lift a hammer.

Fee / soft cost	Range	Trigger
Building permit + plan check (LADBS)	$4K–$14K	scales with construction valuation
School-facility fee (LAUSD or local)	$5.17/sqft new conditioned area	additions + ADUs only
Sewer-capacity charge (LASAN)	$3.8K–$7.2K per new dwelling	new unit creating a sewer connection
DWP service upgrade (200A → 400A)	$6K–$22K	heat pump + EV + ADU combined load
Arts development fee	0.4% of project cost	≥ $500K valuation, single-family
Geotech / soils report	$3.5K–$9K	hillside, expansive soils, deep additions
Surveyor for setbacks / ALTA	$2.5K–$6K	close-to-line ADUs, lot splits

Los Angeles — inspection cadence

From permit to occupancy.

1.Pre-construction: permit issued, NOC posted, dust + erosion control set
2.Underground: plumbing + electrical + grounding before slab pour
3.Foundation: rebar + hold-downs + anchor bolts before concrete
4.Framing: rough framing + shear nailing + strap inspection (often combined)
5.Rough MEP: rough electrical, plumbing top-out, mechanical, T-24 envelope verification
6.Insulation + drywall: HERS verification of duct leakage + envelope tightness
7.Final: building, electrical, plumbing, mechanical, planning — same-day clustering preferred

Los Angeles — how locals fund this

Financing instruments.

HELOC against primary residence — most common ADU funding (60–80% CLTV)
Cash-out refinance — preferred when current first mortgage rate is above market
Renovation construction loan (one-time-close 7/1 ARM)
RenoFi / ADU-specific second loans — based on after-completion appraisal
Property-tax-assessed PACE financing for HVAC, panel, envelope upgrades

cheaper alternatives & their tradeoffs

What we'd consider — and what we wouldn't.

Overlay re-roof (shingle over shingle)
30% cheaper but voids most warranties + traps moisture; never on a building you plan to keep.
EIFS over stucco
Better thermal but historically a moisture-management nightmare — only with rainscreen detail.
Pressure-treated decking
60% cheaper than composite but requires re-staining every 2 years to last.

pitfalls — what we fix on takeover jobs

Mistakes to avoid.

Skipping the moisture probe of stucco before scope-of-work — a 'paint job' turns into a $25K re-skim
Mounting a deck ledger to siding without flashing — #1 source of catastrophic deck failure in CA
Not detailing kick-out flashing at roof-to-wall — drives water behind the siding for years
Installing concrete without proper joint spacing — random cracking that no patch will hide
Skipping a soils report on hillside lots — Hillside Ordinance triggers caissons and import fill that double foundation cost
Under-sized service panels — most pre-1990 homes are 100A, not enough for ADU + heat pump + EV
Mis-reading R1 vs R1V1 zoning — height + FAR rules vary by hillside designation
Ignoring the LADWP separate-meter rule when renting the ADU long-term
Building over a sewer easement — requires LASAN encroachment letter before plan check

In short.

LA deck cost?: $45–$70/sqft pressure-treated; $80–$110 composite or IPE.
Do I need a permit for a low patio?: No if under 30in above grade and detached.

Los Angeles areas we cover.

More of what the Los Angeles studio builds.

Got a Los Angeles project in mind?

Send us the address. We’ll pull zoning, setbacks, and feasibility before you spend money on drawings — and the inquiry routes straight to the Los Angeles desk.

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