Our Companies

Interwest’s growth and success is due, in part, to strategic partnerships with well-respected firms—first as valued clients and colleagues and now as part of our team.

The companies listed below are experts in their respective fields, allowing Interwest to provide solutions to even more of the challenges you face. If you’ve worked with them before, you can expect the same quality of service, now backed with the diverse resources of Interwest.


San Diego, CA

EsGil Corporation is an organization with the expertise you need to best serve the customers of your agency. We have been providing our professional, specialized plan review services to City, County and State agencies and other governmental entities for over 30 years. We focus on what you do. Not only is our strength in our knowledge of the regulations you administer, but we also tailor our correction lists specifically to the needs of your community.

Kutzmann & Associates

Fremont, CA

Founded in 1989, Kutzmann & Associates, Inc. reviews hundreds of projects annually with an excellent record of completing projects on time. The staff at KA has a combined total of more than a century of experience in plan review and inspections. Since our inception we have plan checked over 20,000 projects in 43 different jurisdictions.

We provide plan review and inspection services to city and county building departments to assist them in their application and enforcement of State and local building codes, regulations and ordinances. Also, where approved by the local jurisdictions, we can provide these services on a 3rd party basis directly to permit applicants.


Escondido, CA

A veteran in the construction industry, BroadSpec is certified and licensed in all residential, commercial and industrial building disciplines, providing customers a full range of services, from expert ADA reviews and specialty inspections, to comprehensive feasibility reviews.

For more than 35 years, our team has worked to deliver for our clients the comprehensive, broad-based Project Management services that set the industry standard – and get results. Our seasoned team at BroadSpec offers a full range of professional Construction, Inspection and Engineering services with licenses, certifications, credentials and experience in every identified and recognized discipline.

Tri-Lake Consultants

Perris, CA

Tri-Lake Consultants has been in business since 1988 providing engineering services to municipal clients in Riverside County. They are experts in development processing and have planned, designed, built and maintained a tremendous number of all types of Capital Improvement Projects to include roads, interchanges, drainage, lighting, water and sewer systems to parks and city buildings.

They have also served as the City Engineer for a number of cities and have provided advice and guidance to Department Directors, City Managers and City Councils. Additional specialties include grant writing, public works maintenance, municipal planning and building safety services. Tri Lakes joined Interwest in April of 2018 and have become the Riverside County Office for all Interwest Services.


Irvine, CA

CPSI provides turnkey right of way services including real property acquisition, relocation, cost studies and property management to federal, state, county and municipal governments throughout California and Nevada. CPSI joined Interwest in May of 2019 and has been teamed with Intewest’s existing team of real property professionals to create a group with a deeper level of resources – a natural fit.

Our combined group strives to derive cost-effective solutions through original strategies and research with the ultimate goal of providing our clients with unique, creative solutions to right of way projects while completing every assignment in compliance and within schedule. Our highly effective core team of professionals is experienced and knowledgeable in all right of way disciplines, ensuring that both large- and small-scale assignments are handled efficiently, professionally and appropriately without compromising any attention to detail. With fully staffed offices in both Northern California and Southern California, the Interwest Real Estate team can now provide more effective coverage throughout the State.

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