To build a 3-bedroom independent house in Los Angeles, you will likely need to engage the services of several professionals. Here is a list of professionals who can help you with different aspects of the project:

Architect: An architect will help you design the house, create detailed plans, and ensure the building meets local codes and regulations.

Civil Engineer: A civil engineer will assess the land and soil conditions, design the foundation and structural elements, and ensure that your house meets local building standards.

General Contractor: A general contractor will manage the overall construction process, including hiring subcontractors, obtaining permits, and ensuring the project stays on schedule and within budget.

Subcontractors: Subcontractors are specialized professionals who work under the general contractor. Some familiar subcontractors you may need include:

- Framing carpenter
- Electrician
- Plumber
- HVAC technician
- Drywall installer
- Painter
- Roofer
- Flooring installer
- Tile and countertop installer
- Landscaper

Surveyor: A surveyor will determine the exact boundaries of your property and provide a topographic map, which is essential for designing the house and obtaining permits.

Geotechnical Engineer: If your property has challenging soil conditions or is in a seismic zone, you may need a geotechnical engineer to assess the soil and recommend an appropriate foundation design.

Interior Designer: An interior designer can help you select materials, colors, and finishes for your home, as well as design custom features such as built-in cabinetry or unique lighting.

Solar Installer: If you plan to install solar panels, you will need a solar installer specializing in designing and installing solar energy systems.

Home Automation Specialist: If you plan to incorporate innovative home technology, a home automation specialist can help you design and install a system that meets your needs.

Pool Contractor: If you plan to install a swimming pool, a pool contractor will design and build the collection and coordinate any necessary permits and inspections.

It's essential to research and hire reputable professionals with experience in your area who can provide references and examples of their work.
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