Home Addition Cost in Bay Area, California ()
Home addition cost in Bay Area, California ranges from $170 to $339 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.
Topics Covered in this Guide: Home Addition Cost | Home Addition Cost Factors | Frequently Asked Questions | Related Cost Guides | Find Home Addition Contractors | Home Addition Cost in Your Area
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How Much Does Home Addition Cost in Bay Area, CA?
Home addition cost in Bay Area, California ranges from $170 to $339 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 Bay Area, CA. To get a more accurate 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.
Home addition cost based on the size of the addition:
- 12x12 addition cost (144-sf): $24,000 to $49,000.
- 20x20 addition cost (400-sf): $68,000 to $136,000.
- 20x30 addition cost (600-sf): $102,000 to $204,000.
- 20x40 addition cost (800-sf): $136,000 to $271,000.
- 25x40 addition cost (1,000-sf): $170,000 to $339,000.
- Note: The lower end of these ranges represents standard grade construction and the upper end represents premium grade.
- Note: Luxury grade construction in high cost areas could be as much as double the upper end of these ranges.
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Factors that Influence House Addition Cost in Bay Area
When addition contractors come to your house to provide you an estimate, they will consider a number of 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, the size of your addition, and the topography of the site. Here are a few things to keep in mind when you get quotes from house addition contractors:
Your prices may be higher when:
- You want premium or luxury grade construction.
- The addition requires a foundation.
- The property is historic and requires special approvals.
- The house is occupied.
- A basement needs to be dug.
- The site has a significant slope or is rocky.
- The property is in a hard to reach location (more travel time).
- The property is in a high cost area.
Your prices may be lower when:
- You want standard grade construction.
- No foundation is required.
- The house is vacant.
- The addition does not have a basement (it is constructed on-grade).
- The property is easily accessible (less travel time).
- The property is in a lower cost.
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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 Bay Area 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.
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.
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.
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.
20x20 room addition cost in Bay Area ranges from $68,000 to $136,000 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.
12x12 room addition cost in Bay Area ranges from $24,000 to $49,000 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.
The cost to add a second story in Bay Area ranges from $170 to $339 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.
Related Cost Guides
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:
- Building a new house? Home Building Cost Guide for Bay Area, CA
- Building a barndominium? Barndominium Cost Guide for Bay Area, CA
- Remodeling a bathroom? Bathroom Remodeling Cost Guide for Bay Area, CA
- Remodeling a kitchen? Kitchen Remodeling Cost Guide for Bay Area, CA
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Local Home Addition Contractors Near Bay Area, 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.
Element Home Remodeling A home addition can completely transform your house. It is an ideal solution for adding extra space and can also add value to your home. In general, planning a home addition involves the following stages, architecture, engineering, design and construction. In order to get started you will need to create plans with a licensed architect. At Element Home Remodeling Contractors we offer all the necessary services that are required for any type of home addition.
Bay Builders and Remodeling Inc. Here at Bay Builder & Remodeling, our goal is to build homes that are the best that they can be. We put quality first, not just because we think you deserve it, but because it's in our blood. A home is an extension of the people living in it. That’s why we work closely with homeowners to understand what they’re really looking for, then work to meet and exceed their expectations.
Bay Area Home Remodeling We are general contractors in San Francisco and we are the best choice of all your construction projects requiring that special touch. We handle projects from kitchen remodeling, bathroom remodeling, open floor plans, home additions, ADU conversations, seismic retrofitting and general home renovations. A GC as we say will be the central hub between you, the client and construction crew, permits, city officials inspector and so on.
ASL Remodeling We are a committed home remodeling and home construction company based in California. Our services are available to all the commercial and residential property owners around the bay area. The team at ASL Remodeling construction company is always looking forward to delivering value to your work along with a high-quality service. Our team will listen to you and get to know about the needs and wants you to have based on your preferences.
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Find Home Addition Cost in Your Area
House addition cost varies from area to area. We have developed a number of home addition cost guides to help you identify the room addition cost near you.
- How to Get Home Addition Price Quotes
- How to Get Matched to Home Addition Contractors
- Search for Home Addition Cost in Your City
- Home Addition Cost Guide (National Averages)
- Home Addition Cost in Bayonne, NJ