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Top-Rated Addition to existing structure builders in Los Gatos - Updated Nov 2026

Avatar for Herman Construction Company
Herman Construction Company
5.0(
23
)
Addition to Existing Structure - Build

Serving Los Gatos, CA and surrounding areas

Approved

In business since 2000

Free estimates

Credit card accepted

"Karol is a very nice guy to work with. He is approachable, easy to communicate with. He goes through the project from end to end on our first visit, explain how he would build the frame, cut the wood, the timeline. He also finds a stone guy and coordinates the work. When actually doing the work, he puts cardboards on our floor to avoid scratching. Upon request, he also did a prototype for us, and when we change our mind to use a different style, he redoes the bulk of the project. I would recommend Karol to anyone who needs carpenter work!"
Home Addition
Home Addition
Home Additon
Home Additon
Home Addition

+25

Response time7 hrs
Recommended by78%of homeowners
Avatar for Skytech Builders
Skytech Builders
5.0(
21
)
Addition to Existing Structure - Build

Serving Los Gatos, 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%
14 neighbors recently requested a quote
Avatar for OT Bay Builders
OT Bay Builders
4.9(
122
)
Addition to Existing Structure - Build

Serving Los Gatos, CA and surrounding areas

Approved

Super Service Award Winner

In business since 2021

Free estimates

Warranties offered

"Our basement went from a dark storage area to a cozy family room and home office. The remodel was smooth from start to finish. Great communication, thoughtful design ideas, and skilled workmanship throughout."
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 by60%of homeowners
Avatar for Tool Time Home Improvement
Tool Time Home Improvement
4.6(
207
)
Addition to Existing Structure - Build

Serving Los Gatos, CA and surrounding areas

Approved

In business since 2001

Free estimates

Warranties offered

"I was delighted with the customer service, professionalism, and speed in responding to and completing my project for assembling a Murphy Bed. I will certainly keep this company in my 'go-to' contacts list and highly recommend you give them a try! Thanks so much!"
Additional Photos
Additional Photos
Additional Photos
Additional Photos
Additional Photos

+16

Response time1 day
Response rate100%
8 neighbors recently requested a quote
Avatar for Herman Construction Company
Herman Construction Company
5.0(
31
)
Addition to Existing Structure - Build

Serving Los Gatos, CA and surrounding areas

Approved

Super Service Award Winner

In business since 2004

Free estimates

Warranties offered

"Herman Construction is the best company that I have hired. Karol and his crew work diligently, precisely, accurately, and are punctual. The quotes and estimates are accurate and fair. The work performed was professional and immaculate. Karol and his crew came in to install laminate flooring as I was about to start moving in. The flooring in three rooms came out gorgeous. I approached Karol with a plea of help. I explained the situation with the three rooms that had old carpeting. The previous tenants had dogs that destroyed the carpets and closets. Karol came in with his crew and performed a miracle. The rooms look brand new and the closets refinished to a state where I have lots of room for my clothing. I highly recommend Herman Construction and will be using them for all of my projects. They deserve 10 stars for being the best company."
Second floor House addition in progress. San Jose
second floor house addition before San Jose
Second floor house addition complete
second floor house addition in progress
1 neighbors recently requested a quote
Recommended by67%of homeowners
Avatar for Zacarias Remodeling Construction
Zacarias Remodeling Construction
5.0(
33
)
Addition to Existing Structure - Build

Serving Los Gatos, 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

17 neighbors recently requested a quote
Recommended by87%of homeowners
Avatar for Arroyo Brothers Construction, LLC
Arroyo Brothers Construction, LLC
5.0(
10
)
Addition to Existing Structure - Build

Serving Los Gatos, 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 On Design & Remodeling INC
On Design & Remodeling INC
5.0(
46
)
Addition to Existing Structure - Build

Serving Los Gatos, CA and surrounding areas

Approved

Super Service Award Winner

In business since 2020

Free estimates

Credit card accepted

"We just finished to build an ADU in the backyard with ON Design & Remodeling. In the beginning we met Aviv and he guided us with his team along the design process. They helped us to get the permit faster and choosing all the visible materials before starting the work. During the construction we received weekly updates regards the process so we always knew what to expect. We build the unit for my parents and they are so happy with their new small home, and to share the yard together with us. Currently we are in the planning process to remodel our main resident kitchen with ON team, so obviously we are so happy working with this amazing team."
The Willow Oaks project
First floor kitchen and stairs
Master Bathroom remodeling
Open concept Kitchen
The Willow Oaks project

+421

Response time2 days
Response rate100%
30 neighbors recently requested a quote
Avatar for Clever Design and Remodeling, Inc.
Clever Design and Remodeling, Inc.
5.0(
22
)
Addition to Existing Structure - Build

Serving Los Gatos, CA and surrounding areas

Approved

In business since 2019

Free estimates

Warranties offered

"We hired Clever Design and Remodeling to remodel our two bathrooms and a completely new master suite. We never thought small changes would make such a huge difference our home feels like new, Roy was great to work with too. We worked with them from the very beginning when drawing out our floor plans for the project and they lived up to our expectations. In addition to having new flooring, drywall, paint, completely new bathrooms there was so much more work involved. Their taste in design is impeccable. Thank you, Clever Design and Remodeling, for making it so easy."
Kitchen
Kitchen
Master bathroom
Living Room
Kitchen

+270

Response time12 hrs
Response rate85%
5 neighbors recently requested a quote
Avatar for LeCut Construction
LeCut Construction
5.0(
62
)
Addition to Existing Structure - Build

Serving Los Gatos, CA and surrounding areas

Approved

Super Service Award Winner

In business since 2020

Free estimates

Warranties offered

"This company delivered solid construction results with great attention to safety and quality. The crew was experienced and organized. The final build looks excellent. Very happy with their work."
kitchen
kitchen
kitchen
bathroom
bathroom

+165

Response time1 day
Response rate87%
Recommended by29%of homeowners
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FAQs for addition to existing structure building service projects in Los Gatos, 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 Los Gatos, 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.