Home Addition Cost in Southern California, California ()

Home addition cost in Southern California, California ranges from $143 to $286 per square foot. Standard grade construction is represented by the lower end of this range and premium grade construction is represented by the upper end of this range. Luxury grade construction could be as much as twice the cost of the upper end of this range. To get a more accurate cost for your home addition project, request a quote. Please note that if you use our matching service, we may be compensated.

Home Addition Cost
By HomeBlue Team
April 13, 2023 02:07 PM

Topics Covered in this Guide: Home Addition Cost | Home Addition Cost Factors | Frequently Asked Questions | Related Cost Guides | Find Home Addition Contractors

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How Much Does Home Addition Cost in Southern California, CA?

Home addition cost in Southern California, California ranges from $143 to $286 per square foot. Standard grade construction is represented by the lower end of this range and premium grade construction is represented by the upper end of this range. Luxury grade construction could be as much as twice the cost of the upper end of this range. Consult with a contractor to discuss the pros and cons of different construction grades.

This guide is intended to provide you an approximate home addition cost in Southern California, CA. To get a quote for your specific project, request a free estimate. Our research, although general in nature, does include feedback provided by home addition contractors and research conducted by the HomeBlue staff.

House addition cost based on the size of the addition:

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Factors that Influence House Addition Cost in Southern California

When addition contractors come to provide you an estimate, they will consider several factors that can increase or decrease the cost of your project. Pricing for your home addition project will vary based on the quality of construction you choose. Here are a few things to keep in mind when you get quotes from house addition contractors:

Your prices may be higher when:

Your prices may be lower when:

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Home Addition FAQs

Here are a few frequently asked questions related to home addition construction:

You can find home addition contractors in Southern California by 1) asking a neighbor for a referral, 2) searching for “home addition contractors” in your favorite search engine, 3) using a traditional paper directory resource (yellow pages), 4) looking for ads on your local TV station, 5) using an online matching service.

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Find Home Addition Contractors in Southern California

In general, hiring an architect or designer to prepare construction documents is likely necessary. The structural elements of the building will need to be designed and stamped by a licensed structural engineer. If you need to do foundation work, you may also need a civil engineer to make sure the site is properly graded. You can ask your builder if they could assist you with the design process (ie: do the project using a design/build approach) or whether they would prefer you hire an architect separately to prepare drawings. Either way, the final design documents will then need to be submitted to your local permit office for approval.

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Find an Architect in Southern California

Building a home or an addition requires a contractor’s license in most localities. However, many localities provide exemptions when property owners choose to serve as the general contractor for a property that they own. You will need to research your local laws. For instance, here is a link to a Florida statute addressing owner-builder exemptions. There are pros and cons relating to serving as an owner-builder. For instance, you will assume many of the responsibilities and liabilities associated with the project.

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Discuss Your Options with a Contractor in Southern California

It is highly likely that you will need a building permit to build a home addition. Discuss the permit process with the contractors you are considering for the project. A seasoned and reputable contractor should be comfortable and willing to help guide you through the process or willing to handle the task as part of their contract.

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Get Matched to a Home Addition Contractors in Southern California

20x20 room addition cost in Southern California ranges from $57,000 to $115,000 depending on the grade of construction used. Standard grade will be at the lower end of this range and Premium grade will be at the upper end of this range. To get a more accurate cost for your specific project, request a quote from a local contractor.

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Get Estimates from Home Addition Contractors in Southern California

12x12 room addition cost in Southern California ranges from $21,000 to $41,000 depending on the grade of construction used (standard is at the bottom end of this range and premium grade is at the top end of this range). To get a more accurate cost for your room addition project, request a quote from a local contractor.

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Get Quotes from Home Addition Contractors in Southern California

The cost to add a second story in Southern California ranges from $143 to $286 per square foot depending on the grade of construction used (standard is at the lower end of this range and premium grade is at the upper end of this range). To get a more accurate cost, request a quote from a local contractor.

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Cost Estimates from Home Addition Contractors in Southern California


We have researched several other closely related projects. If one of these projects better represents the type of project you are undertaking, please check out the appropriate guide:

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Local Home Addition Contractors Near Southern California, CA

The following are a few contractors in your area. Note that these companies have not been screened or vetted by HomeBlue. Please conduct proper due diligence prior to hiring these or any other company you may select.

California Home Builders California Home Builder is a family possessed business: Licensed, Insured and Compensated, and Bonded. Years in business, interestingly situated to meet short and long haul Construction/home Remodeling Service needs. Our Company us a main give of administration to the whole Planning, Pre-Construction handle. We make positive and critical encounters with enduring connections due to our activity are guided by our care values.

Cavalier Builders inc Since 1999, our family-owned and operated remodeling contractor company, Cavalier Builders, has provided services such as room additions, kitchen, and bathroom remodeling, interior/exterior painting, roofing, patio work, complete plastering, construction, and more in the Los Angeles area. Our builders renovate homes every day and are fully qualified to handle any service you need. For a complete listing of the construction, remodeling, and renovation services Cavalier Builders offers in Los Angeles, learn more about our services.

Sea Pointe Design & Remodel Specializing in kitchen design & remodeling, bathroom remodeling, and whole home remodeling, Sea Pointe Design & Remodel’s comprehensive approach to remodeling unifies design and construction, offering clients a single point of contact and all-inclusive project pricing. With unsurpassed attention to detail and diligent project planning, Sea Pointe Design & Remodel keeps your home remodeling project on schedule and within budget. Through our commitment to service and quality construction, the Sea Pointe Design & Remodel team of award-winning designers, expert project managers, and skilled craftsmen strive to provide our clients with a most positive, successful, and fun.

So Cal Design Build, Inc So Cal Design Build is a family-owned, 4th generation Building & Remodeling company. We believe that honesty and open communication, with our clients, is key to customer satisfaction and retention. Our business model creates an interactive dialog from inception to the completion of your project, which allows for greater flexibility and adjustments as needed. As local business owners, we believe that giving back to our community is a personal responsibility.

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