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Top-Rated Addition to existing structure builders in Thousand Oaks - Updated Nov 2026

Avatar for Pristine Construction Inc
Pristine Construction Inc
4.9(
212
)
Addition to Existing Structure - Build

Serving Thousand Oaks, CA and surrounding areas

Approved

In business since 1997

Free estimates

Emergency services offered

"Pristine Construction just completed a kitchen remodel for us this December. The project was finished on time even though additional projects were added along the way. Everybody from Pristine Construction did their job in the most professional and honest way possible. Through Angie’s List reviews, I came to know their reputation. And these reviews helped me to contact Pristine. The reviews were written in a way that I saw and experienced personally the good things about Pristine Construction. My wife and I were impressed from the start. Nathan and Mike listened to our needs and tried their very best to fulfill them. In my opinion, the crews and staff are the best in their field of expertise. Throughout the project, not only our 1950s-built house had kitchen upgrade, but also had other upgrades done. These other upgrades were done without sacrificing the timeline of the project. My family are all thrilled with the result of the project. I am proud and right in choosing Pristine Construction. I will choose them again on my next home improvement projects."
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+16

Response time7 hrs
6 neighbors recently requested a quote
Recommended by100%of homeowners
Avatar for HA My Design, Inc.
HA My Design, Inc.
5.0(
379
)
Addition to Existing Structure - Build

Serving Thousand Oaks, CA and surrounding areas

Approved

Super Service Award Winner

In business since 2011

Free estimates

Customers say: True professional

"I hired Golan and H&A My Design to build an addition to my house. Golan was very professional, helpful, communicative and honest. He listened to my suggestions and gave me some great advices. The project was finished ahead of schedule and I am completely satisfied with the outcome. Highly recommend Golan and H&A My Design!"
After
Kitchen Remodel+Fireplace
Complete Home Renovation
Complete Kitchen Remodel
Complete Kitchen Remodel

+526

Response time1 day
Response rate100%
Recommended by92%of homeowners
Avatar for So Cal Builders & Design Inc
So Cal Builders & Design Inc
4.6(
311
)
Addition to Existing Structure - Build

Serving Thousand Oaks, CA and surrounding areas

Approved (Corporate)

Super Service Award Winner

In business since 1982

Free estimates

Warranties offered

"After several long years of designing and permitting our home remodel during the pandemic, we were searching for a good contractor to build out our remodel and second story addition. Avi and David were wonderful; very thorough in explaining the process, answering all of our questions, and settling on a price that was reasonable and within our budget. During the building process, David was very responsive, available, and receptive to changes and last minute decisions made along the way. The project took longer than anticipated and there were some unexpected setbacks, but David and Avi worked quickly to fix issues and keep the project moving forward. At the end of the project they were very responsible about making sure we were satisfied with every last detail before completing the project. Our new home is beautiful and we're very happy with how it turned out, thanks to David and all the crews at So Cal Builders."
Completely renovating both the guest and master bathrooms. In the master bathroom, we're installing a spacious walk-in shower featuring dual black-finished shower heads, elegant floating benches, and marble wall tiles. Meanwhile, the guest bathroom will have a sleek built-in tub and stylish hexagon tiles.
This project involved adding a new master bathroom to the existing house. The shower features sleek white subway tiles complemented by striking black fixtures and shower door hardware. The bathroom floor is adorned with elegant white marble tiles, providing a seamless and luxurious finish. A white shaker vanity topped with a white marble countertop completes the space, creating a clean and sophisticated look.
Experience a whole new level of indoor-outdoor living with the Torres Residence Backyard Remodel. This project highlights the addition of a kitchen sliding door, seamlessly merging your interior and exterior spaces
We remodeled the current kitchen, incorporating the addition of a new sliding door to establish a seamless indoor-outdoor living area
New pool with Baja bench and spa. New pavers, aluminum patio cover and built-in BBQ in the backyard

+563

33 neighbors recently requested a quote
Recommended by83%of homeowners
Avatar for KN Remodeling & Supplies Inc
KN Remodeling & Supplies Inc
4.8(
63
)
Addition to Existing Structure - Build

Serving Thousand Oaks, CA and surrounding areas

Approved

In business since 2012

Free estimates

Warranties offered

"The KN Remodeling team did an excellent job at our home completely remodeling 3 bathrooms, painting our entire home and rebuilding a huge planter outside. We trusted them in our home while we are out of town almost the entire time. We hired them back to do additional work in our home that they did quickly and expertly. The team was professional, very friendly, worked quickly, quietly, cleanly, and I would highly recommend them."
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+48

Response time8 hrs
Response rate100%
4 neighbors recently requested a quote
Avatar for Creative Home Remodeling Group Inc.
Creative Home Remodeling Group Inc.
4.7(
257
)
Addition to Existing Structure - Build

Serving Thousand Oaks, CA and surrounding areas

Approved

Super Service Award Winner

In business since 2003

Free estimates

Warranties offered

"We've been in our Lakewood home over 27 years and finally made the decision to put our "60's kitchen out to pasture. We had three good contractors bid for this project. We were most impressed by Ben of Creative Home Remodeling Group. His enthusiasm, attention to detail and follow-thru remained constant from concept to completion. Ben overperformed and under promised. His crew of company contractor specialists have been with him for years, and their rapport and communication showed in the finished project. He was on site and/or in phone contact with them and us constantly. They finished ahead of time with Ben staying on task through each stage and to final inspection. No reflection on Ben or his company, but us being a first- time user of a contractor's services, we were a little green about the process, the quotation and what to expect. It is often said to add 20% to the bid for unexpected costs. There were two legitimate additions that couldn't be anticipated. They were fully explained and understood. It is important for anyone doing this, to make good notes and keep in mind what the bidder is contracting to provide and what your responsibilities will be. Ben made this clear from the start-nothing hidden. Many items required us to go to the vendor, choose, and to pay directly, outside the bid parameters. These items-specifically: the vinyl flooring, the quartz counter tops and backsplash, sink, faucet and disposal being the main ones. For the most part, only the highest expense (the cabinets) was factored into the quotation. My wife and I would use Ben and Creative Remodel again and recommend him and his Studio City company without reservation"
Complete Kitchen with White and Blue Cabinets
Complete Kitchen Modern Kitchen With Botcher Island
posses of the kitchen remodeling
Modern ADU, large space with studio and 1 bathroom, big windows
White Kitchen Cabinets

+427

Response time1 day
Response rate100%
7 neighbors recently requested a quote
Avatar for YB Builders Group Inc.
YB Builders Group Inc.
5.0(
14
)
Addition to Existing Structure - Build

Serving Thousand Oaks, CA and surrounding areas

Approved

In business since 2025

Free estimates

Credit card accepted

"Ben helped us convert our VERY old garage (80+ years) into a modern multipurpose room. He was communicative throughout the process, friendly to work with, and the final product exceeded our expectations. We highly recommend YB Builders to anyone looking for a contractor."
Bathroom Remodel
Master bathroom
Master bathroom
Master bedroom
Kitchen Remodel

+74

40 neighbors recently requested a quote
Avatar for Imperial Remodeling Inc
Imperial Remodeling Inc
4.6(
128
)
Addition to Existing Structure - Build

Serving Thousand Oaks, CA and surrounding areas

Approved

Super Service Award Winner

In business since 2006

Free estimates

Emergency services offered

"Gino with Imperial Remodeling was fantastic. He is professional, an excellent communicator, does quality work, and is also just a really nice guy. As a woman, I didn’t want to work with someone who would be dismissive toward me or only want to deal with my husband — and that was never an issue. I’ve heard countless stories of contractors being impossible to reach and not showing up when they said they would. That was never the case with Gino. There wasn’t a single time when Gino or his crew weren’t exactly where they said they would be, exactly when they said they’d be there. He always made himself available to answer any questions we had. He does not cut corners. I stopped by the house when they were installing the hardwood floors, and he was personally going through the boxes, pulling out the best-looking pieces to use in the living areas and saving the pieces with less attractive color variations for closets or under cabinets. That’s how much care he puts into his projects. Any issue or hiccup we encountered, he made it right. He even finished ahead of schedule. Gino takes so much pride in his work and truly wants his customers to be happy. We cannot recommend him enough."
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+185

Response time1 day
Recommended by89%of homeowners
Avatar for Home Renew 360
Home Renew 360
4.7(
78
)
Addition to Existing Structure - Build

Serving Thousand Oaks, CA and surrounding areas

Approved (Corporate)

In business since 2010

Free estimates

Warranties offered

"We had Home Renew 360 do some major remodeling in our home. We had our kitchen, floors, and bathroom remodelled. The team did a great job. All of the team members were friendly, knowledgeable, and well prepared. We could not be happier with the team that worked on our home. ALL of them! They were clean and did excellent workmanship. They showed up on time and completed the work before the scheduled completion date. Farid was our project manager and he was excellent. He was prepared and provided us excellent service. He responded quickly to our questions, provided quality guidance, and was knowledgable to what was being done to our home and provided excellent creativity when asked about specifics of how our ideas would fit with our remodel. I would high recommend Home Renew 360 for any of your home improvement needs."
Roof in Huntington Beach
Asphalt Shingle Roof
Flat roof
Master Bathroom
Exterior Paint

+179

Response time8 hrs
Response rate100%
23 neighbors recently requested a quote
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FAQs for addition to existing structure building service projects in Thousand Oaks, 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 Thousand Oaks, 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.