Roundup: the biggest construction projects breaking ground in LA County right now

Every one of these is a job that eventually needs a final clean, and most of them will need several rough cleans on the way. Sources are linked on every figure. Where a project broke ground before this year and is still the biggest thing on the board, it is marked as under way rather than new.

Public works and infrastructure

The Old Road improvements, Castaic. LA County broke ground on 10 July 2026 on a $250 million reconstruction of about two miles of The Old Road alongside Interstate 5, widening it from two lanes to three in each direction and adding bike lanes, sidewalks, ADA curb ramps, landscaped medians and streetlights. Phase 1 runs from Mayo Drive to Rye Canyon Road through 2028; Phase 2 starts in 2027 and finishes by early 2031. (The Signal, Hometown Station)

Avalon Pedestrian Bridge and Promenade Gateway, Wilmington. The Port of Los Angeles broke ground on 26 February 2026 on a $152 million project: a 380-foot cable-stayed arch bridge over the Pacific Harbor Line, plus roughly 12 acres of former industrial land converted to public space with an entry plaza, overlook, terrace seating, two parking lots and restrooms. Completion is targeted for late summer 2028. (Patch, Port of Los Angeles)

Smith Park Community and Aquatic Center, Pico Rivera. Pico Rivera broke ground on 8 July 2026 on a $39.4 million rebuild: the existing community center is renovated, the aging pool is demolished and replaced with two pools, and roughly 4,000 square feet of community space is added. (Hoodline)

LA County Care Community, Norwalk. Ground broke on 6 March 2026 on a $106 million conversion of long-vacant state buildings on the Metropolitan State Hospital campus, including $65 million in state Proposition 1 funding. The program is 162 beds: 32 in two locked mental health rehabilitation centers, 70 in interim housing, and 60 permanent supportive apartments. The interim housing and rehabilitation centers are due December 2027 and January 2028. (Supervisor Janice Hahn)

Housing

6380 Wilshire Boulevard, Carthay. Permits have been issued and work is starting on Jamison Services' conversion of a 1963 office tower into housing: 17 stories, about 144,000 square feet, 217 apartments, with roughly 27,000 square feet of amenities and a retained 176-car garage. Next Architecture is the designer, and the original windows and glazing are being kept. (Urbanize LA, 5 August 2026)

1540 Court Street, Echo Park. Construction has gone vertical on Visionary Developments' The Court Residences: a seven-story, 189-apartment building for low- and middle-income households, with no on-site parking, designed by Kevin Tsai Architecture and JZA Architecture. (Urbanize LA, 3 August 2026)

1717 S. Beloit Avenue, Sawtelle. A seven-story, 102-apartment building with a two-level, 97-car subterranean garage, 14 units set aside as very low income. The developer is EJKS, LLC, the architect is Sam Ghanouni, and construction is running 18 to 24 months. (Urbanize LA, 30 July 2026)

1919 Wilcox Avenue, Hollywood. A six-story, 65-unit building is under way just south of the 101. (Urbanize LA, 31 July 2026)

Still the biggest thing on the board

Los Angeles Convention Center expansion, downtown. Under way rather than new: this one broke ground on 1 October 2025. It is a $2.6 billion project adding 190,000 square feet of exhibit space and a 98,000-square-foot rooftop ballroom in a structure bridging Pico Boulevard between the West and South Halls, taking total exhibit space past one million square feet. Plenary Group is the private partner, Populous the architect, Webcor and PCL the builders. Completion is 2029, with construction pausing in 2028 for the Olympic Games. (Urbanize LA, ABC7)

What this list says about the work

Three things stand out if you clean buildings for a living.

The housing on this list is mid-rise infill, not towers. Six and seven storeys, 65 to 217 units, tight sites, subterranean parking. That is repetitive unit-by-unit final cleaning with a long punch-list tail, done on a construction elevator with no parking. It is a different operation from a single big commercial floorplate, and it is priced differently.

Adaptive reuse is a distinct scope. The Wilshire tower keeps its existing glazing and its existing garage. Conversions carry decades of accumulated grime on surfaces nobody replaces, and they run alongside occupied or partly occupied floors more often than ground-up work does.

The public projects are long and phased. The Old Road runs to 2031, the Avalon bridge to 2028, the convention center to 2029 with a pause in the middle. Phased jobs mean repeated mobilisation, and the crews that get that work are the ones who can show up for a two-day rough clean and then not be needed for six weeks.

We will refresh this list each quarter. If your project should be on it, tell us and we will check the permit record.