Corner Keystone Construction Corporation is firm in its commitment to provide total customer service satisfaction. We focus in public works maintenance and repair services with a growing number of clients mostly in municipalities, cities and counties in the Southern California area. We specialize in services such as additions, remodel, renovate, improvements and repairs of all or any part of a building may it be residential or commercial. We also do plumbing works like installation and repair of water heaters, plumbing fixtures, pipes, and the like. Patio covers decks and enclosures, window and door installation or replacement, ceiling and painting works, name it and we will gladly do it with skill and passion. From the planning phase all the way to the project’s completion, we make every effort to provide our clienteles with the most efficient and cost effective means to accomplish their construction goals.

We provide services particularly in the Southern California area mostly in the Los Angeles, San Diego, San Bernardino and Orange Counties.

Concrete Installation and Repair Services

Our company provides concrete works and repair on curbs, gutter, berms, patio, pathway, flooring, and other area specified by the client.

Masonry and Stonework Services

Our company provides masonry works such as installation of veneer, bricks, concrete block wall, tiles, terrazo, pavers; and stoneworks including rubble stone wall and stone walkways.

Carpentry Services

Our company offers carpentry services including but not limited to rough carpentry, installation of partition walls, drywalls, framing, sheathing, and siding. This also includes cabinets, countertops, wood flooring and stairs construction.

Painting Services

Services offered by our company under this category are building exterior and interior painting including surface area cleaning, caulking and patching prior to application of paint.

Plumbing Construction Services

Services offered by our company under this category are installation of pipe and tubing, valves, water pumps, water meters, plumbing fixtures and equipment, showers, bathtubs, lavatories, urinals, water closets, plumbing rough-in, drain, vent, waste pipe, compressed air systems, boilers, and heating and A/C controls.

Electrical System Services

Services offered by our company under this category includes installation of interior wire systems, conduits, grounding systems, power lighting, and electrical fixtures.

Window & Door Installation and Erection Services

The services include:

  • installation of doors
  • windows
  • grills, and glass & glazing for residential
  • commercial and government projects.

Building and Facilities Maintenance and Repair Services

  • Exterior and Interior Painting
  • Plumbing
  • Electrical
  • Masonry, Concrete, and Stucco
  • Wall and Ceiling

Remodeling and Alterations Services

  • Carpet, Tile, Wood Flooring
  • Roof Framing, Roofing and Bended Panels
  • Indoor and Outdoor Kitchen
  • Bathroom Remodel
  • Multiple Room Renovation

Other Services

  • ADA Compliance Services
  • Sheds and Enclosure Services
  • Wall Covering Construction Services
  • Paper Hanging Services
  • Floor Laying Services
  • Interior Finishing and Furnishing Services
  • Roofing & Siding and Sheet Metal Services
  • Earthquake Protection Retrofitting Services

Our Company’s Area of Expertise

  • Bathroom and Kitchen Renovation
  • Single and Multiple Rooms Major Renovation
  • Repair or Replacement of Faucets, Pipes, and Fixtures
  • Installation or Replacement of Conventional and Tankless Water Heaters
  • Quality Exterior and Interior Painting

Corner Keystone Construction Corporation offers a wide range of services catering different clients on residential, commercial, and government (public works) areas.


  • Lee Residence Remodel
  • Addition and Remodeling of Matic Residence


  • Little Sun Flowers Inc.|Valencia Mall Little Sun Flowers DBA Gymboree Repair


  • Omnitrans | Paint and Carpet Replacement and Installation; Flagpole Installation
  • City of Santa Clarita | Annual Trail Fence Replacement
  • City of Montclair | Demolition of Montclair Residential Properties Project
  • County of San Luis Obispo | Gen Govt-Replace Windows at Various Locations
  • City of Chino Hills | City Yard Fencing Modification
  • City of Ontario | Painting, Framing/Drywall, and Final Cleaning for the City Hall Carpet Replacement Program
  • County of Los Angeles Department of Health Services | Women and Children Hospital Board-up
  • Los Angeles County Internal Services Department | Steel Floor Plate Replacement
  • California Department of Education | Interior Wall and Ceiling Repair
  • San Diego Unified School District | Remodel of Relocatable Classroom at Kate Sessions ES; Remodel of Relocatable Classroom at Crown Point ES
  • City of Glendora | Exterior Painting and Cedar Shingle Siding Replacement at the La Fetra Center