Build it without shutting it down.

Tenant improvements and renovations in buildings that can’t stop working: occupied offices, clinics, warehouses, and public facilities across Southern California.

We renovated fire stations while the crews were still living in them, and the stations never stopped answering calls.

Request a Conceptual Budget See how we run an occupied job →
• Principal-led · building in Southern California since 2004 • Occupied, operating buildings: our normal • Rehired four times in six years by the same client • CSLB #852623 · Class B General Building · Class A General Engineering • Bonded & insured
01 / Services

What we build

Most of our work happens inside buildings that are still being used. That single fact shapes everything below it.

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Tenant Improvements

Office, medical, and retail interiors, built to the tenant’s spec, delivered on the landlord’s schedule.

Occupied Renovations

Renovation and modernization in buildings that stay open. Phased areas, sealed work zones, and an occupant who always knows what happens next.

Public Facility Work

Fire stations, airports, campuses, civic buildings. Institutional process, inspected end to end.

Parking Structure Restoration

Post-tension repair, concrete spall repair, railings, striping. Not standard building-contractor scope.

Preconstruction & Conceptual Budgeting

A number you can take to an owner, from a set of drawings or from a walk-through.

02 / Markets

Who we build for

Markets →

Commercial property owners & managers

Occupied buildings, live tenants, and a schedule that has to hold.

Healthcare

Clinical environments, inspected under the state’s hospital regulator.

Corporate & multi-site facilities

One contractor across a portfolio, instead of a new one every job.

Industrial & logistics

The parts of the facility your people actually work in.

Public agencies

Two decades of public work, and the process discipline that comes with it.

Public agency information →
03 / Featured Work

Featured work

Illuminated arrow wayfinding walls inside Ontario International Airport, built by CALTEC as part of the terminal work.

Ontario International Airport, Terminals 2 & 4

More passengers through the same building, while it keeps flying.

We’re relocating the TSA checkpoints, lanes, X-ray, walk-through detectors, AIT scanners, and adding new lanes to increase passenger throughput across both terminals. It’s one of multiple live airports where we’ve changed TSA checkpoint x-ray configurations. Alongside it: new exit corridors with automated breach lanes, relocated space for TSA and airport staff, supervisory stations overlooking the checkpoints, restrooms, mother rooms and breakrooms, and new LED walls that expanded the advertising inventory the airport has to sell.

The airport never stopped flying. Underway.
CALTEC crew replacing gate-area carpet overnight at Palm Springs International Airport, with the terminal intact around the work.

Four projects, one client, six years

For the City of Palm Springs: secured airline offices and ticketing hall areas, terminal modifications, the Bono Concourse, and a single contract covering eight of the city’s buildings, from the public library to the animal shelter to the police department.

Airport Enabling Project · Terminal Modifications · Common Use Podiums · Skylight Railings

Every one of the eight stayed open while we worked. They’ve hired us four times in six years.
The completed building exterior with new asphalt paving, parking striping and concrete curbing, exterior electrical panels and conduit, a standby generator, and a secured gate.

Medical Examiner High Desert Facility Replacement

County of Los Angeles, Department of Public Works · Lancaster

Interior renovation of an existing building for use as the County Coroner regional office, including new interior finishes. Sitework included new site utilities, a new stormwater treatment system, new parking and container storage, a new steel building for refrigerated storage, and a new emergency generator.

Completed 2026.
04 / Our Process

An occupied building doesn’t get a grace period.

It isn’t a technique. It’s a temperament: the Friday call about Tuesday’s shutdown, made without being asked.

See how we run an occupied job →