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Top-Rated Addition to existing structure builders in San Mateo - Updated Nov 2026

Avatar for Skytech Builders
Skytech Builders
5.0(
21
)
Addition to Existing Structure - Build

Serving San Mateo, CA and surrounding areas

Approved

In business since 2013

Free estimates

Warranties offered

"After I contacted several contractors on a room addition I decided to go with Sky Tech Builders and I can tell that it was a really easy decision because they gave me great offer and they completely understood what I wanted to do. They were also available on acceptable time and project started soon after we signed a contract. The project manager and his crew were professional, honest, helpful and very respectful to me and my home. They finished project within time they promised and within my budget. And final outcome is excellent, I am fully satisfied with everything they did and would definitely work with Sky Tech Builders again!"
Master Bathroom Remodel in San Jose.
Kitchen Remodel in San Mateo
Kitchen remodeling in Fremont
Master Bathroom Remodel in San Jose.
Kitchen Remodel in San Mateo

+63

Response time1 day
Response rate100%
12 neighbors recently requested a quote
Avatar for OT Bay Builders
OT Bay Builders
4.9(
128
)
Addition to Existing Structure - Build

Serving San Mateo, CA and surrounding areas

Approved

Super Service Award Winner

In business since 2021

Free estimates

Warranties offered

"We needed more space for our growing family, and the addition they built blends in seamlessly with our original home. From permits to the finishing touches, everything was handled professionally. It’s like it was always meant to be part of the house!"
Broadway Kitchen Remodel
Broadway Full Kitchen remodel
Broadway Full Kitchen remodel
San Francisco Contemporary Kitchen Remodel
San Francisco Contemporary Kitchen Remodel

+81

Response time12 hrs
Response rate100%
Recommended by56%of homeowners
Avatar for Zacarias Remodeling Construction
Zacarias Remodeling Construction
5.0(
33
)
Addition to Existing Structure - Build

Serving San Mateo, CA and surrounding areas

Approved

In business since 2009

Free estimates

Customers say: True professional

"Zacarias Remodeling Construction is AMAZING! Oscar and his crew recently did a complete kitchen/ family room renovation for us and it was such a wonderful experience. Oscar and his team are incredibly professional and "can do". We were living at our vacation house during the renovation and trusted them to make decisions and keep us in the loop with calls, texts, and photos. They were always so responsive and did beautiful work. We had several unexpected structural issues arise that were due to previous work that another contractor had done at our house, and they found creative and cost effective ways to correct the problems. They are also just such lovely people--so kind and accommodating, always trying to make the client happy. And they kept the job site very clean and tidy. We trusted them completely to keep our home safe while we were living remotely. We cannot recommend them highly enough for any sized job. Their workmanship is phenomenal and our kitchen/family room turned out gorgeous!"
Remodeling - General Project
Remodeling - General Project
Remodeling - General Project
New kitchen, bedroom and bathroom
Remodeling - General Project

+50

19 neighbors recently requested a quote
Recommended by87%of homeowners
LEES PRO BUILDER
4.6(
48
)
Addition to Existing Structure - Build

Serving San Mateo, CA and surrounding areas

Approved

In business since 1989

Free estimates

Warranties offered

"I undertook a comprehensive, whole-house renovation in order to sell my older home. Although Mr. Lee runs his business out of San Jose, he willingly traveled all the way to my residence in Sacramento to take on the project, delivering highly satisfactory results within a remarkably short timeframe. From the initial contract signing through to the final stages of construction, he executed the work with such perfection and professionalism. Furthermore, thanks to the renovation, I was able to sell the house for a significantly higher price. I wholeheartedly recommend him to anyone. He is a diligent and exceptionally honest contractor."
Photos of my work
Photos of my work
Photos of my work
Photos of my work
Photos of my work

+8

3 neighbors recently requested a quote
Recommended by77%of homeowners
Avatar for Masterful Construction, Inc.
Masterful Construction, Inc.
5.0(
28
)
Addition to Existing Structure - Build

Serving San Mateo, CA and surrounding areas

Approved

In business since 2023

Free estimates

Credit card accepted

"I had an excellent experience working with Masterful Construction for our building design project. Their team was professional, knowledgeable, and highly skilled. They took the time to understand our needs and delivered a design that exceeded our expectations. The communication throughout the process was great, and they were always responsive to our questions and concerns. I highly recommend their services for any building design needs."
master bathroom
san mateo master bath
mirror
Master bathroom
master bathroom

+66

Response time12 hrs
Response rate85%
3 neighbors recently requested a quote
Avatar for Quartz Construction
Quartz Construction
4.7(
77
)
Addition to Existing Structure - Build

Serving San Mateo, CA and surrounding areas

Approved

In business since 2000

Free estimates

Emergency services offered

"Everything I expected from Quartz building our deck.So honest,they did everything that was promised.Finished in a timely manner and kept it clean.They used high quality material.I will recommend Quartz to my family and friends.Love my beautiful deck. The Salsedo's"
bathroom
bathroomremodel
stairs
stairs
wood deck

+252

Response time2 days
Recommended by87%of homeowners
My Remodeling Group
5.0(
31
)
Addition to Existing Structure - Build

Serving San Mateo, CA and surrounding areas

Approved

In business since 2023

Free estimates

Credit card accepted

"I had a great experience with My Remodeling Group during my kitchen remodel. From planning to completion, their communication was clear and consistent. They listened to my ideas, offered helpful design suggestions, and delivered high-quality craftsmanship. The kitchen now looks stylish, spacious, and much more functional. Everything was completed as promised, with great attention to detail. I highly recommend My Remodeling Group for professional and reliable remodeling services."
Avatar for Sigura Construction Inc
Sigura Construction Inc
4.4(
58
)
Addition to Existing Structure - Build

Serving San Mateo, CA and surrounding areas

Approved

In business since 2003

Free estimates

Credit card accepted

"We had an amazing experience with Sigura Construction on our backyard transformation project. They did a fantastic job building a swimming pool, outdoor kitchen, landscaping with pavers, and custom lighting. The entire crew was incredibly professional, thorough, and efficient, delivering top-quality work from start to finish. Ilan, the owner, was outstanding—easy to communicate with, professional, and highly knowledgeable about all the options for our project. He made the entire process seamless and stress-free. Our backyard now looks absolutely stunning, and we’re thrilled with the results. We have complete peace of mind knowing the work was done by true experts. We highly recommend Sigura Construction to anyone looking for exceptional construction services. Thanks again to Ilan and the team for a job well done!"
Bathroom Remodel
Guest Bathroom
Upstairs Bathroom 2
Upstairs Bathroom 1
Downstairs Restroom

+121

1 neighbors recently requested a quote
Recommended by75%of homeowners
Avatar for Rose Remodeling & Design Inc.
Rose Remodeling & Design Inc.
4.8(
95
)
Addition to Existing Structure - Build

Serving San Mateo, CA and surrounding areas

Approved

Super Service Award Winner

In business since 2023

Free estimates

Emergency services offered

"Adir and his team exceeded all expectations with our ADU project. They helped us refine our design, handled permits efficiently, and executed the work beautifully. Every part of the build shows quality and care. What I appreciated most was their communication. They kept us informed the entire time. It?s rare to find a company this reliable."
PHOTO ALBUM
PHOTO ALBUM
PHOTO ALBUM
PHOTO ALBUM
PHOTO ALBUM

+128

Response time6 hrs
Response rate95%
19 neighbors recently requested a quote
Avatar for Bay Remodeling Kitchen & Bath
Bay Remodeling Kitchen & Bath
5.0(
69
)
Addition to Existing Structure - Build

Serving San Mateo, CA and surrounding areas

Approved

Super Service Award Winner

In business since 2006

Free estimates

Emergency services offered

"To create my ideal kitchen, the staff at Bay Remodeling Kitchen & Bath went above and beyond. They listened to my thoughts, made useful recommendations, and transformed my kitchen into a lovely, hospitable area."
Palo Alto full Home Remodel
Full Bathroom Remodel Mountain Veiw, CA
Portola Valley, CA
Bathroom Remodel in Palo Alto, CA
Bathroom Remodel San Jose, CA

+183

16 neighbors recently requested a quote
Recommended by67%of homeowners
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FAQs for addition to existing structure building service projects in San Mateo, CA

You can typically raise your roof by four to eight feet, depending on your home's structure and roof design. The exact amount depends on factors like roof slope and framing support. Raising the roof creates additional interior space, enhances natural light, and increases your home's value. Consult a professional to determine the feasible height increase for your home.

Yes, you need a building permit to raise your roof. Obtaining a building permit ensures your project complies with local building codes and safety regulations. A professional contractor can assist with the permit and inspection process and ensure all legal and safety requirements are met. Your contractor will be familiar with building codes in your area, which can differ between cities or states.

While it's possible to raise a flat roof, it requires extensive structural modifications. Flat roofs lack the attic space and support structures of pitched roofs, so raising them involves significant engineering to ensure safety and durability. This process can be complex and costly, so professional assessment is essential before undertaking a project of this magnitude.

The San Mateo, CA homeowners’ guide to addition to existing structure building services

From average costs to expert advice, get all the answers you need to get your job done.