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Find Addition to existing structure builders in Portola Valley

Avatar for OT Bay Builders
OT Bay Builders
5.0(
109
)
Addition to Existing Structure - Build

Serving Portola Valley, 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 by68%of homeowners
Avatar for Future Vision Remodeling
Future Vision Remodeling
4.9(
57
)
Addition to Existing Structure - Build

Serving Portola Valley, CA and surrounding areas

Approved

In business since 2013

Free estimates

Credit card accepted

"The finished work turned out beautifully but the length of time it took the crew to complete the job could have been better. The project manager was great to work with and very responsive however there are a couple of small details that I am waiting for them to resolve."
Additional Photos
Additional Photos
Additional Photos
Additional Photos
Additional Photos

+555

Response time7 hrs
Response rate100%
11 neighbors recently requested a quote
Avatar for Skytech Builders
Skytech Builders
5.0(
21
)
Addition to Existing Structure - Build

Serving Portola Valley, CA and surrounding areas

Approved

In business since 2013

Free estimates

Warranties offered

"As most of us know when we do a remodeling project, it is real hard to find good and honest people to complete your project. Fortunately, I found Leo and Yonathan from SkyTech Builders to help me with remodeling and repairing two of the bathrooms in my family's 4-Plex building. They were very honest, polite and helpful each step of the process from start to finish. The are very patient and suggested materials and design but always thinking about quality and your budget. Overall the experience with Leo and Yonathan was top notch and we were very satisfied with the finished product. We will definitely be using Sky Tech Builders for our future construction projects."
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%
26 neighbors recently requested a quote
Avatar for Arroyo Brothers Construction, LLC
Arroyo Brothers Construction, LLC
5.0(
10
)
Addition to Existing Structure - Build

Serving Portola Valley, CA and surrounding areas

Approved

In business since 2010

Free estimates

Small jobs welcome

"These folks are conscientious, honest contractors. I have hired then for many years and I am never disappointed in the workmanship and quality. They always back their work and came back to fix something that they worked on. An added bonus is that they are just great people. I would highly recommend them and I am picky."
Los Gatos Remodel
Los Gatos remodel and addition
Los Gatos remodel and addition
Los Gatos remodel and addition
Santa Cruz Bathroom

+8

Response time12 hrs
Recommended by100%of homeowners
Avatar for Sigura Construction Inc
Sigura Construction Inc
4.4(
58
)
Addition to Existing Structure - Build

Serving Portola Valley, CA and surrounding areas

Approved

In business since 2003

Free estimates

Credit card accepted

"It went well. There were some surprises. Damaged shingles and structural damage were discovered once we were underway. This lengthened the duration and cost of the project. Fortunately Sigura has carpentry capabilities in addition to their painting skills and were able to make the needed repairs before resuming the painting. The rest went without a hitch."
Bathroom Remodel
Guest Bathroom
Upstairs Bathroom 2
Upstairs Bathroom 1
Downstairs Restroom

+107

3 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 Portola Valley, 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%
15 neighbors recently requested a quote
Avatar for Prosper Construction Development, Inc.
Prosper Construction Development, Inc.
4.4(
52
)
Addition to Existing Structure - Build

Serving Portola Valley, CA and surrounding areas

Approved

In business since 2013

Free estimates

Credit card accepted

"Prosper and the team at Prosper Construction just completed a beautiful renovation of my home. I badly needed new flooring and decided to add other updates as well. So we embarked on the journey to design an addition to our home and redesign the entire front of the house, which included a kitchen remodel as well. I knew that I wanted to replace my carpet with porcelain tile, but I thought that I would leave my existing kitchen tile in place, to save a little money. Prosper convinced me to eliminate all transitions in the flooring and replace the entire house with the new tile, and I am really glad that he did! The house now has a smooth flow and an expansive look that is just gorgeous. The entire experience was beyond worth the investment. The most amazing part of the transformation of my home is my stunning new master bathroom, which Prosper also advised me on."
modern railing
after staining the new stairs #2
modern kitchen design
convert traditional bathroom into modern bathroom
modern bathroom

+134

Response time6 days
Recommended by97%of homeowners
Avatar for McCormick Home Builders, Inc.
McCormick Home Builders, Inc.
4.7(
42
)
Addition to Existing Structure - Build

Serving Portola Valley, CA and surrounding areas

Approved

In business since 2017

Free estimates

Customers say: True professional

"We found McCormick home builders through Angie’s list. They were not one of our original contacts, but they contacted us and came out to give us a quote. Matteo was extremely helpful, informative, honest, and gave us reasonable realistic prices, and did not try to inflate the prices or pressure us in anyway. We felt very comfortable with him immediately. We felt like he was a member of the family that we could just talk to and ask questions he was very personable. He gave us his contact number in case we had other questions and he was always available when we needed him for any type of questions or concerns. Mateo‘s team did a beautiful job. They were fast. They were efficient. They cleaned up beautifully. They did a wonderful job. They were very considerate of our time our needs and our neighbors. They were an absolute pleasure to work with. I would highly recommend Matteo from McCormick home builders for any home building projects, and we will be calling him again in the future!"
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+1

Response time6 hrs
Recommended by15%of homeowners
Avatar for Lindgren Construction
Lindgren Construction
4.3(
36
)
Addition to Existing Structure - Build

Serving Portola Valley, CA and surrounding areas

Approved

In business since 1996

Free estimates

Small jobs welcome

"Having purchased this second home out of state and literally knowing nothing about the area and what was needed to set up the reconstruction, he was highly recommended by our real estate agent and had great references from other homeowners in the area. Eric helped us find a local architect/designer, worked with the building planning district, water district, etc. etc. so he's much more than just a General Contractor.  We simply could not have completed the work without him. As with all remodels, it's stressful and he was the calm, steady person needed to keep everyone in check.  He had great sub-contractors and every portion of the work was completed as guaranteed per the contract.  When there were hiccups, he fixed it.  He did all the hard work, just coordinated with us to be sure we got what we expected from each phase.  The results exceeded all our expectations.  No hesitation with recommending him for any job, large or small.
"
Recommended by92%of homeowners
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FAQs for addition to existing structure building service projects in Portola Valley, 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 Portola Valley, 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.