Welcome to Mannix Architecture

About Us

Our Services

We're an architectural office in El Cajon, CA offering A&E services for  residential, commercial & military projects.  

We offer design services, planning, construction drawings and construction observation services.

Our Projects


2017 - Roof Replacements, Minot AFB

Complete design of new roofs for Dining Hall, Security Services and Post Office buildings in Minot AFB, ND.

2017 - VA San Diego - Renovate 1SW for Emergency Dept. Triage

Renovation of 7,311 SF to the triage and emergency department areas for the VA Hospital in San Diego, CA.

2017 - Repair BEQ 520442 

Repair and remodel of 69,827 SF to the BEQ Building 520442 located at the Marine Corps Base in Camp Pendleton, CA.

2016 - Borrego Medical in Barstow, CA

T. I. to an existing 1 story building consisting of 26,205 SF to convert the existing bowling alley over to medical offices.

2016 - Land Point Of Entry, Dunseith, ND

T. I. for the existing Border Station with new paving and ramps for the GSA in North Dakota.  

2016 - Learning Choice Academy

T. I. for a 9,500 SF change of occupancy for a Home School Testing facility in Chula Vista, CA.

2015 - Borrego Medical in San Bernardino, CA

T. I. to an existing 2 story building of 10,150 SF for conversion to medical offices.

2015 - tshirtmart in El Cajon, CA  -  Building Renovation / Addition

Renovate existing 4,000 SF building and design a 1,500 SF addition for a new tshirtmart located on 2nd St. in El Cajon, CA.  

2015 - Borrego Medical in El Cajon, CA

T. I. of  9,150 SF to the 2nd floor for medical offices located in the redevelopment area of downtown El Cajon, CA.


2015 - Nuclear Medicine Remediation - Dept. of Veteran Affairs - VA Hospital

Repair and remodel to Building 1 - 4th Floor.

2014 - tshirtmart in San Diego, CA  - Facade design and T. I. to the existing building for a new tshirtmart on Balboa Ave in San Diego, CA. 

2014 - Helix Water District - Nat. L. Eggert Operations Center Stucco Project.  Advise and prepare plans and specifications for the stucco project to the 15,000 SF operations building located in El Cajon CA.

2013 - Distant Patient Housing Building at VA Greater Los Angeles, CA - New single story hotel 

style building of 11,617 SF which received LEEDS Silver certification when completed.

2012 - Halbert Residence in Jamul, CA 

Major remodel of 3,586 SF.

2012 - Ft.Sam Houston, TX - Army Corps of Engineers - New 2 story 30,434 SF Administrative office building in the Warrior in Transition(WT)Complex - LEEDS Silver certified.

2011 - Fort Polk, LA - Army Corps of Engineers - New single story 6,932 SF multi- purpose building in the Warrior in Transition (WT) Complex - LEEDS Silver unsubmitted. 

2011 - Naval Base Point Loma in San Diego, CA - Repair & renovate Gateway Inn & Suites - Building 555 - 48 units - 3 story 24,500 SF

2011 - VA Menlo Park - A new 26,413 SF warehouse with office improvements and a SPD center with loading dock.

2010 - Yuma, AZ - Building 930 BEQ Renovation to the (Bachelor enlisted Quarters) of  27,700 SF.

2010 - Alpine Industrial Building - A new pre-fabricated Varco Pruden metal building of 26,500 SF located in Alpine, CA

2010 - Lottes Professional Building - A new 2,400 SF one story office addition to existing building with front facade improvements to the entire frontage located in El Cajon, CA

2009 - Corners Promenade - Three (3) new buildings of approximately 32,000 SF for multi use in downtown El Cajon, CA

About Us

Mannix Architecture was established in 1986 and has over 30 years experience in design and engineering.

Daniel C. Mannix, AIA is a member of the American Institute of Architects and is licensed in the state of California.  Graduated from Cal Poly San Luis Obispo in 1981.

LEED AP BD&C  &  NCARB certified.

Our office is located at    

439 El Cajon Blvd. 

El Cajon, CA   92020

We can be reached at the following:

 #(619) 588-7730  Office 

#(619) 302-7730 Cell

#(619) 588-2932 Fax 


Contact Us

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Questions & Estimates

We can be reached at the following:

#(619) 588-7730  Office

#(619) 302-7730  Cell

#(619) 588-2932  Fax

Mannix Architecture

439 El Cajon Blvd. El Cajon, CA 92020

#(619) 588-7730


Monday - Friday: 9am - 5pm

Saturday - Sunday: Closed