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Top-Rated Addition to existing structure builders in Agoura Hills - Updated Nov 2026

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

Serving Agoura Hills, CA and surrounding areas

Approved

In business since 1997

Free estimates

Emergency services offered

"The remodeling of my guest bath went very smoothly. I had few ideas as to what I wanted, but thanks to Nathan's design help, I was able to select the items that fit my concept. Many reviews talk mainly about the job and the results, but there is one important area that is often neglected: the working crew. Without exception his guys, besides being highly competent, were both respectful and considerate at all times. I strongly recommend this company!"
Additional Photos
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+16

Response time7 hrs
6 neighbors recently requested a quote
Recommended by100%of homeowners
Avatar for Bridgestone Construction Inc.
Bridgestone Construction Inc.
5.0(
60
)
Addition to Existing Structure - Build

Serving Agoura Hills, CA and surrounding areas

Approved

In business since 2018

Free estimates

Emergency services offered

"We recently re-did our Master Bathroom and wanted to do some of the work ourselves. So we sought out Bridgestone Construction and met with Jeremiah. He was so helpful in suggesting some possible layouts and making sure we got the perfect size and look for our design. In addition, even though we were doing the actual work, he suggested counter and color choices and kept in contact to make sure things were working out okay. As usual, the crystal cabinets came in exactly as expected and look great in the finished bathroom. Bridgestone Construction Inc and Jeremiah were awesome to do work with."
Home Development
Bathroom Remodel
Kitchen Remodel
Residential Development
Residential Development

+2

Response time2 days
Response rate100%
2 neighbors recently requested a quote
Avatar for HA My Design, Inc.
HA My Design, Inc.
5.0(
379
)
Addition to Existing Structure - Build

Serving Agoura Hills, CA and surrounding areas

Approved

Super Service Award Winner

In business since 2011

Free estimates

Customers say: True professional

"H&A MY Design made building our garage an effortless and enjoyable process! From the moment we walked into their incredible 5,000-square-foot showroom, we knew we were in the right hands. The showroom truly is a one-stop shop where we could explore construction materials, finishes, and design ideas all in one place. The team helped us narrow down options that fit both our vision and budget. Their professionalism, attention to detail, and seamless communication were second to none. The construction crew was respectful and clean, completing the job on time without any hassle. I wouldn’t hesitate to recommend them for any home improvement project."
After
Kitchen Remodel+Fireplace
Complete Home Renovation
Complete Kitchen Remodel
Complete Kitchen Remodel

+526

Response time1 day
Response rate100%
3 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 Agoura Hills, CA and surrounding areas

Approved

Super Service Award Winner

In business since 2003

Free estimates

Warranties offered

"If you need an addition built on your house, I'd highly recommend you give Creative Remodeling a call. We used them to add a master suite which makes our house much more livable. We've also decided to add decking in the back yard off the the back of the house. Oh, and this was after working with them during Covid on a kitchen and 2 bathrooms. So that makes us repeat, on repeat, on repeat customers. The work is quick, to a good quality, and they listen to what the customer wants and have dealt with the odd snafu without any push back. Highly recommended."
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%
8 neighbors recently requested a quote
Avatar for KN Remodeling & Supplies Inc
KN Remodeling & Supplies Inc
4.8(
63
)
Addition to Existing Structure - Build

Serving Agoura Hills, CA and surrounding areas

Approved

In business since 2012

Free estimates

Warranties offered

"We just finished a four bedroom/ three bathroom full remodel in Santa Monica. We are very happy with the end result. Nathan, who is the owner, was very involved in all phases of the job. Nathan got the job done on time. The workmanship and attention to detail was great. He had good communication and relationship with his team. Whenever we had a concern or question, Nathan was easy to get a hold of and handled it quickly. We were worried about the process of a remodel with all the stories you hear about bad experiences. But Nathan made this so easy on us and we would definitely use him for any future projects."
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+48

Response time8 hrs
Response rate100%
5 neighbors recently requested a quote
Avatar for So Cal Builders & Design Inc
So Cal Builders & Design Inc
4.6(
308
)
Addition to Existing Structure - Build

Serving Agoura Hills, CA and surrounding areas

Approved (Corporate)

Super Service Award Winner

In business since 1982

Free estimates

Warranties offered

"Avi from So Cal Builders & Design Inc was our general contractor for our house's addition/expansion. This is the 2nd time we worked with Avi and his team, after he helped us completely remodeled our existing house, we know he is the perfect guy for our phase II of building the addition to our house. Again, Avi is so great to work with! He is very knowledgable on all construction related work and he is always available to help with whatever. He is able to come up with super creative solutions for all our requests/wants, we couldn't be happier with the work from So Cal Builders & Design Inc! My city is pretty strict come to all different types of code, Avi was amazing at managing all the city requests for us, I am glad that he helped with all that stuff for us so we didn't have to worry about anything. The work itself is truly awesome, and Avi and his team are here for us even when the work is completed when we need anything. I completely trust Avi and will for sure recommend him to anyone!"
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

42 neighbors recently requested a quote
Recommended by84%of homeowners
Avatar for DT Design and Build, Inc.
DT Design and Build, Inc.
4.7(
81
)
Addition to Existing Structure - Build

Serving Agoura Hills, CA and surrounding areas

Approved

In business since 2014

Free estimates

Warranties offered

"Beauty. Integrity. Responsibility. These words describe DT design & build INC. Tal and his amazing crew ensures that the work done on your home is beautiful and of excellent quality. DT design & build INC delivers the promised work at the promised price, arrives and finishes on time, treats the customer and your property with respect, and is eager to please. In a time where the words "customer service" are almost a thing of the past; DT design & build INC gives hope that beauty, integrity, and responsibility still exist."
New house
New house
Bathroom
Livingroom
Bathroom

+43

Response time9 hrs
Response rate97%
Recommended by100%of homeowners
Avatar for YB Builders Group Inc.
YB Builders Group Inc.
5.0(
13
)
Addition to Existing Structure - Build

Serving Agoura Hills, 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

56 neighbors recently requested a quote
Avatar for Trig Builders, Inc.
Trig Builders, Inc.
4.9(
37
)
Addition to Existing Structure - Build

Serving Agoura Hills, CA and surrounding areas

Approved

In business since 2004

Free estimates

Warranties offered

"We hired Trig Builders to tear out our bathtub, shower and shower walls and to build a tub deck with a drop in tub; install marble tiles on the shower floor & walls and vanity backsplash, remove and relocate the old recessed lights and vent fan and install the shower/bath all plumbing fixtures. Like most other people, we also had many other bids before deciding who to hire for that work and at the end of this hard process, we decided to go ahead with Trig Builders. Our decision to hire and work with them was based on their positive online opinions from other clients and the excellent reputation that they have. At first, we worked only with Michelle about the design and the selection of materials of the project. It was a pretty easy and not complicated to work with her. At the end of that process, we were extremely happy with the overall design and the flow of the space. After that stage, Yossi was assigned to our project and he took over with the designs and flow. During the work, we had close to 6 workers that worked daily on the entire project starting with demolition, framing, and construction, paint and finishes installation. By having all this people working at the same time, we felt and noticed that the work is running super-fast and we loved it! Yossi made sure that each stage will be approved by him and this was the main reason why he visited our house on a daily basis (sometimes even more than once a day). The work was completed after 3 weeks from the day that Michelle met with us and we approved the design and the flow. At the end of the work, Yossi and Michelle came over to the final meeting where we inspected all the work and the final project. During that meeting, we informed them about few issues and Yossi was able to take care of them the following day making sure that they all will be resolved and approved by us. This is the greatest service we could think of. Trig Builders did a great work and we do recommend them for any construction work."
Addition in Diamond Bar
Addition in Diamond Bar
Addition in Diamond Bar
Addition in Diamond Bar
Addition in Diamond Bar

+15

Response time7 hrs
Recommended by87%of homeowners
Avatar for Imperial Remodeling Inc
Imperial Remodeling Inc
4.6(
128
)
Addition to Existing Structure - Build

Serving Agoura Hills, CA and surrounding areas

Approved

Super Service Award Winner

In business since 2006

Free estimates

Emergency services offered

"I did not fully know this about me, but I am the client from H***. However, Mr Gino and everyone at imperial remodeling went above and beyond any expectations I could have had. And I am a perfectionist; which does not exist, but no one could have gotten closer than these guys. We did a complete remodel of three bathrooms floors, walls paint etc. I’ve had custom glass installed. And they built out a whole new bathroom for me without destroying the design and functionality of my beautiful mid-century modern home. I am definitely going to work with them again. I hope they work with me( Please read first sentence again). You will not find better quality and affordability in the same place as I did. Thank you imperial remodeling for treating my home as it was your own and for caring about us and exceeding all our expectations. You are the best at home remodel and I am glad we met!"
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+185

Response time1 day
Recommended by89%of homeowners
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FAQs for addition to existing structure building service projects in Agoura Hills, 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 Agoura Hills, 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.