Home Addition Cost in San Mateo, California ()
Home addition cost in San Mateo, California ranges from $162 to $324 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
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How Much Does Home Addition Cost in San Mateo, CA?
Home addition cost in San Mateo, California ranges from $162 to $324 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 San Mateo, 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:
- 12x12 addition cost (144-sf): $23,000 to $47,000.
- 20x20 addition cost (400-sf): $65,000 to $130,000.
- 20x30 addition cost (600-sf): $97,000 to $194,000.
- 20x40 addition cost (800-sf): $130,000 to $259,000.
- 25x40 addition cost (1,000-sf): $162,000 to $324,000.
- 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 San Mateo
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:
- 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 San Mateo 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 San Mateo ranges from $65,000 to $130,000 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 San Mateo ranges from $23,000 to $47,000 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 San Mateo ranges from $162 to $324 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 San Mateo, CA
- Building a barndominium? Barndominium Cost Guide for San Mateo, CA
- Remodeling a bathroom? Bathroom Remodeling Cost Guide for San Mateo, CA
- Remodeling a kitchen? Kitchen Remodeling Cost Guide for San Mateo, CA
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Local Home Addition Contractors Near San Mateo, 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.
Om's Remodeling Welcome to Om’s Remodeling, where style, quality and excellence are our number one priority when remodeling your home or business. We offer our commercial and home remodeling services in California and the surrounding areas. Whether you require a full or partial remodeling project, our experienced team will provide excellent workmanship, quality service and frequent communication throughout the entire project.
Horizon Renovation As a highly experienced general contractor, Horizon Renovation has the resources to handle all of your projects in San Mateo, CA. When you run into an urgent issue, you can turn to our team 24 hours a day, seven days a week. We take pride in creating a home that you'll love, and we can tailor our services to your lifestyle and aesthetic goals.
Home Remodel San Mateo Everyone has big dreams for their home. You want to live in the space that is perfect for you. Something that represents the personality and color of you and your family, inspiring you each day. But to achieve that, it takes quality design and remodeling work. That is why you need to find a reliable team of home remodeling contractors that can help you bring your ideas to life. And, if you are looking for leading home remodeling contractors in San Mateo, CA that means that you need to be coming to us, at Home Remodel Experts of San Mateo.
Aguilar Building Company General Contractor. We are driven by years of experience and astute attention to detail. Our versatile team collaborates directly with clients to implement successful results, from conception to completion. With an in-house budgeting team we can provide budgets in a quick and timely manner. Visit our Contact page to get in touch with us and we can provide you with your own customized budget. Finaly considers no job to be too small or too big. Each and every client is provided the same treatment throughout the construction process, regardless of project size.
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Related Pages
- How to get home addition price quotes
- How to get matched to home addition contractors
- Home Addition Cost Guide
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