What is the design wind speed in Los Angeles?

For standard Risk Category II buildings, the Los Angeles basin design wind gust is roughly 95 to 110 mph under ASCE 7-22, and it varies by the exact address. The basic map reads relatively low, but Santa Ana downslope winds funneling through canyons set the true local peak gusts.

Are wind loads required in Los Angeles if seismic governs design?

Yes. Even though seismic demand usually governs the lateral system near the San Andreas and other active faults, wind is never optional on a City of LA permit. ASCE 7-22 wind still controls components and cladding such as windows, panels, parapets, and rooftop equipment, and tall towers face cladding pressures, drift, and motion limits.

What exposure category applies to Los Angeles wind load calculations?

Dense urban LA, including downtown, the Valley, and Hollywood, generally reads Exposure B because of upwind low-rise obstructions. Properties within a block or two of open ocean, such as Santa Monica, Venice, Marina del Rey, and Malibu, step up to Exposure C, producing higher velocity pressures.

How does risk category change the Los Angeles design wind speed?

There is no fixed multiplier. A higher risk category reads a different, longer-return-period wind map, which raises the design gust. Risk II standard occupancy reads roughly 95 to 110 mph, while schools, assembly, and essential facilities like hospitals and fire stations read a higher-speed map. Actual mph varies by site.

How do I calculate wind load for a Los Angeles building?

Pin the basic wind speed for the address, set Exposure B or C, check topographic Kzt near hillside crests, and classify the risk category. Velocity pressure uses qz equals 0.00256 times Kz, Kzt, Kd, Ke, and V squared, with Kd of 0.85 for buildings. A California-licensed PE seal carries the calcs through LADBS plan check.

CALIFORNIA · LOS ANGELES

Where the basin runs calm until the canyons exhale

In the LA basin the design map reads low, yet Santa Ana downslope winds tearing out of the mountains and canyons set the local peak gusts. Here seismic governs and CBC + ASCE 7-22 still demand wind on every permit.

95–110MPH DESIGN GUST (RISK II)

B / CEXPOSURE · URBAN TO COAST

CBCTITLE 24 · ASCE 7-22

LALOS ANGELES COUNTY

DOWNSLOPE WIND · SPECIAL WIND REGION

Off the mountains, into the basin

Santa Ana winds compress as they pour down the Transverse Range slopes and accelerate through San Gabriel and Santa Monica canyons — dry, gusty, and locally fierce, even where the basic-wind map stays modest.

Santa Ana downslope gusts

Canyon-funneled gusts often reach 40–70 mph, higher in the passes — the basin's true local wind driver.

DOWNSLOPE

Special wind-region terrain

Mountainous Southern California is flagged on the map; site-specific judgment, not a flat basic value, governs ridges and canyons.

TERRAIN

Exposure B across the basin

Dense urban LA — downtown, the Valley, Hollywood — reads Exposure B with low-rise obstructions upwind.

EXPOSURE B

Exposure C at the shoreline

Santa Monica, Venice, Marina del Rey and Malibu near open ocean step up to Exposure C and higher pressures.

EXPOSURE C

SEISMIC-DOMINATED DESIGN

Earthquakes set the structure, wind still sets the skin

Sitting beside the San Andreas and a web of active faults, LA's lateral system is almost always governed by seismic demand — but ASCE 7-22 wind on the City of LA permit is never optional.

Seismic governs the MWFRS

CBC Chapter 16 and ASCE 7 Ch. 11–12 typically produce the larger lateral force resisting the basin's high seismicity.

Wind drives components & cladding

Windows, panels, parapets and rooftop equipment are frequently wind-controlled even when seismic owns the frame.

Tall towers feel it most

Downtown high-rises see upper-level cladding pressures, drift and motion limits — wind-tunnel work per ASCE 7 Ch. 31.

ASCE 7-22 · TABLE 1.5-1

Risk category steps the LA design speed

Higher risk categories read a longer-return-period wind map, lifting the design gust — no fixed multiplier, the map itself changes.

Risk Category	LA Design Wind Speed	Typical Buildings
I	~85–100 mph	Agricultural, temporary, minor storage
II	95–110 mph	Homes, retail, most standard occupancy
III	~105–120 mph	Schools, assembly >300, hazardous materials
IV	~115–130 mph	Hospitals, fire stations, shelters, EOCs

PERMIT-READY · LADBS

What it takes to comply in Los Angeles

Six checkpoints between an LA basin site and a sealed, plan-check-ready wind submittal.

Pin the basic wind speed

Read 95–110 mph (Risk II) for the exact LA address — basin, hillside, or shoreline.

STEP 1

Set exposure B vs C

Urban basin reads B; properties within a block or two of open ocean step to C.

STEP 2

Check topographic Kzt

Hollywood Hills and Santa Monica Mountains ridgelines can push Kzt above 1.0 near crests.

STEP 3

Classify the risk category

Schools, assembly and essential facilities read a higher-speed map than standard occupancy.

STEP 4

Resolve C&C and MWFRS

Even seismic-governed frames need wind-checked cladding, openings and rooftop arrays.

STEP 5

Seal for LADBS plan check

A California-licensed PE seal carries the wind calcs through LADBS structural review.

STEP 6

EXPLORE NEARBY · STATEWIDE

Compare across the Southern California map

From the LA basin out to neighboring coastal cities and the full California framework.

All State Requirements Wind Speed by Location

RUN THE LA NUMBERS

Calculate Los Angeles wind loads to the address

Enter any LA basin, hillside, or shoreline address for 95–110 mph velocity, B/C exposure, risk-category mapping, and PE-ready ASCE 7-22 output for LADBS.

Calculate Los Angeles Wind Loads California Requirements