Skip to main content
By clicking “Accept All Cookies”, you agree to the storing of cookies on your device to enhance site navigation, analyze site usage, and assist in our marketing efforts. View our Privacy Policy for more information.
Accept

GROUNDED IN SAFETY, BUILT ON SUSTAINABILITY

An engineering service company providing over 125 years of dedication, technical expertise, and sustainable solutions in the growth of our built environment.

REQUEST FOR PROPOSAL VIEW OUR WORK
Scroll Down
a couple of tall buildings sitting next to each other

Since 2015, We've Provided Over

$80 Million

In Services On Energy Projects

With California Public Agencies, Over

$100 Million

Worked On Over

2,000

Healthcare Projects

Worked On Over

$1 Billion

In California Private Development

At Twining, Integrity Is Our Foundation.

Twining is a full-service engineering company with unmatched technical expertise and a strong reputation for delivering reliable and compliant engineering services and solutions. For over 125 years, we've built a legacy of setting new benchmarks for quality and innovation in materials testing, inspection, applied engineering, and integrated disciplines.

LEARN MORE

Pioneering New Standards

Twining possesses full-service construction material testing laboratories that are certified, accredited, and/or inspected by all major governing agencies.

Tailored Solutions
For Every Project

Twining provides a wide range of engineering services and solutions to address diverse construction and engineering needs. Our services are designed to ensure compliance with industry standards and regulations.

Engineering

Engineering

  • Geotechnical Engineering

  • Vibration and Geo-Instrumentation

  • Concrete Engineering & Research

  • Forensics

Learn More Details
a man riding a bike down a road next to a forest

Materials Testing

  • Soils Engineering and Testing

  • Pavement Engineering and Testing

  • Concrete Research, Development, and Value Engineering

  • Testing of Steel, Concrete, Masonry, and other materials

  • Materials Testing Laboratories

  • Concrete Testing

  • Asphalt Testing

  • Testing of Steel, Concrete, Masonry, and other materials

Learn More Details
Inspections

Inspections

  • Special Inspection

  • Construction Inspection

  • Stormwater Inspection

  • Balcony Bill Inspections

Learn More Details
a building with a lot of different types of buildings

Modular

  • Quality System Auditing & Listing

  • Industrialized Buildings

  • Mobility Vehicle Equipment Evaluations

Learn More Details
Color Green Background

Your Reliable Partner Across Industries

Energy

Energy

Provides the energy sector with geotechnical engineering, testing, and inspection services for the construction of power plants, renewable energy, pipelines, and other projects.

Transportation

Transportation

Offers soils, asphalt, and concrete design, recommendations, testing and inspection to ensure that transportation infrastructure is safe and durable

Public Works

Public Works

Ensures that public infrastructure projects, such as such as roadways, bridges, water and wastewater treatment plants, pipelines, pump stations, and municipal facilities, meet quality standards and regulatory compliance

Healthcare

Healthcare

Provides engineering services and solutions to ensure that healthcare facilities meet strict building codes and regulations

Private Development

Private Development

Evaluates construction materials for a variety of projects, including commercial buildings, residential buildings, affordable housing, and mixed-use developments

Education

Education

Helps ensure the structural integrity, safety, and quality of educational facilities

Industrialized Buildings (Modular)

Industrialized Buildings (Modular)

Supports the growing modular construction industry by offering industrialized building expertise and ensuring that structures meet safety standards and regulatory compliance

Featured Project

VIEW OUR WORK
Great Wolf Lodge
VIEW PROJECT
Great Wolf Lodge
Kilroy Realty, 2100 Kettner
VIEW PROJECT
Kilroy Realty, 2100 Kettner
Hilton Waterfront Beach Resort
VIEW PROJECT
Hilton Waterfront Beach Resort
FedEx, Chino
VIEW PROJECT
FedEx, Chino
Culver City USD, Robert Frost Auditorium Expansion
VIEW PROJECT
Culver City USD, Robert Frost Auditorium Expansion
CSULB, College of Continuing & Professional Education
VIEW PROJECT
CSULB, College of Continuing & Professional Education
Confidential Theme Park Client, P384
VIEW PROJECT
Confidential Theme Park Client, P384
LADPW, Lancaster Solar Energy Project
VIEW PROJECT
LADPW, Lancaster Solar Energy Project
Custom BG Neutral

Where We’ve Been

Dotted Maps
2,000+
Completed Healthcare Projects
75,000+
Completed Public Works Projects
10,000+
Private and Public Sector Clients
It should be noted, Twining continually met and exceeded the sometimes unrealistic demands placed on your team without any complaints. We would not have completed the project on time and within budget without the professionalism, expertise and the ability of your firm/project team to manage the extremely demanding inspection schedule while frequently being notified with less than 24 hour notice.
Gafcon

Gafcon

Twining responded when we reached out to you on short notice and providing personnel conducting themselves in a professional manner are very much appreciated! I will count myself blessed to have Twining on my team in the future here at Pepperdine. Well Done!
Pepperdine

Pepperdine

Department of Design and Construction

Michael consistently anticipated important coordination required, identified relevant issues for the SEOR and was extremely organized and thorough with his work. Michael's personality, work ethics and ability to work effectively with the contractor, subcontractors and engineers proved to be over and above the average expectations and sets a standard of quality in the industry that is greatly appreciated
Walter P. Moore

Walter P. Moore

Twining is extremely knowledgeable in what they do and how they do it. They are experts in their field and bring a high level of professionalism and integrity to EVERY JOB. I look forward to working with them on any project.
KEVIN BUCHTA, AIA

KEVIN BUCHTA, AIA

Project Design Director