Home Addition Cost in Simi Valley, California ()

Home addition cost in Simi Valley, California ranges from $143 to $287 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 Simi Valley, CA?

Home addition cost in Simi Valley, California ranges from $143 to $287 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 Simi Valley, 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 Simi Valley

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 Simi Valley 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 Simi Valley

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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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 Simi Valley

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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20x20 room addition cost in Simi Valley 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 Simi Valley

12x12 room addition cost in Simi Valley 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 Simi Valley

The cost to add a second story in Simi Valley ranges from $143 to $287 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 Simi Valley


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 Simi Valley, 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.

Pauls General Construction LLC. Hello, this is Paul Garcia Owner of Paul’s General Construction LLC. I look forward to doing business with you! I’m a licensed General B Contractor and have 10 years of experience specific to general construction. My company satisfaction is based on delivering efficient work, summarizing three core values Honesty, Integrity, and Commitment. We honor workmanship here at Paul’s General Construction LLC, and committed to bringing your home vision to reality.

Preferred Home Builders Over the past 26 years we’ve helped many new and returning clients meet their renovation milestones, delivering well designed and structured projects. We are renowned for transforming challenges into results through our commitment to perfection. Established in 1996, we’ve successfully completed over three thousand remodeling projects. Our success is derived from a highly skilled and devoted team of designers, project managers, builders and craftsmen, with an uncompromising level of quality and attention to detail.

Cavalier Builders inc Cavalier Builders, Inc. has been in business since 1999. Our company offers high-quality home remodeling, renovation, construction, and repair to Los Angeles and those that live here in Southern California. We are a family owned and operated business that is proud of the work we do for our customers. When you need remodeling or renovations, you should use a company that is bonded and insured.

Bedrock Remodeling & Building Bedrock Remodeling and Building Inc. is a dedicated company that will manage every aspect of your construction and remodeling project. We will work hard to ensure that your remodeling Los Angeles project is completed on schedule and that it meets your specific requirements. We offer a wide range of expertise for various industries and clients.

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