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

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

Serving Mission 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!"
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+16

Response time7 hrs
7 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 Mission Hills, 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 ADU and they did excellent job and exceed my high expectations. The project went smooth, there were no issues and was finished ahead of schedule. It was a true pleasure to work with Golan and his team and final product is a top notch. Also this company have a one stop shop showroom for all finishes, 5000 square-foot. I highly recommend 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 Mission Hills, CA and surrounding areas

Approved (Corporate)

Super Service Award Winner

In business since 1982

Free estimates

Warranties offered

"Our initial meeting with Suj was great. Initially, we had in mind a much larger job. He had quoted us $3000 for the closet demolition / wall rebuild (non-load bearing), packaged with several other items. Together with the fee for drawings ($4000) and permits, this was a bit higher than we anticipated. However, we decided to go with Suj due to his responsiveness and professionalism. Out of our other quotes, Suj’s pricing was middle of the pack - not the cheapest or most expensive. When the drawings were complete and evaluated, he gave us an updated cost of $6000 over text message. The scope of work had changed, and this was no longer part of a bigger project - understandable. The issue was when he gave us the official estimate a week later and up’d the price once again to $9000. When asked what happened, his exact words were “well, I need to get paid too”. He had weeks to consider before quoting the $6000 and nothing had changed since then. The extra $3000 may be insignificant compared to most renovation costs, but for us in our first home, this was back breaking. We continued with Suj since we were already locked in and well past the 3 day cancellation period. Their work for the most part was exceptional. The new wall blended perfectly into our existing structure, and the ceiling patch was also well done. The problem here was the floor. They had dug up a 1” deep pit in the floor, likely to remove the wall studs. However, they did not patch the floor or even let us know this was going to be an issue. We were never told about the pit until I decided to check in on their progress one day towards the end of the wall build. This required us to pay a handyman to come in next day on a weekend to patch the concrete since we had cabinets being installed the following Tuesday. Suj was aware of this and did not believe it pertinent information. Overall, Suj and SoCal Builders do quality work, but the issues in pricing consistency lost us before the work even started. Not even telling us that we’d be left with a 1” deep pit in our floor after was another huge issue which should’ve been brought up much earlier. This was our first experience with a contractor and I’m not sure if this is typical or not. However, it’s enough to make me doubt I’d contact them for any future work."
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

35 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 Mission Hills, CA and surrounding areas

Approved

In business since 2012

Free estimates

Warranties offered

"Nathan impressed from the time I first met him. He was far more professional than other contractors in terms of describing how his company works and what I should expect if I worked with him. He also has a nice showroom where you can look a variety of cabinets in different styles and colors as well as countertops. We ended up getting a countertop that he suggested. We would never had picked it on our own but it ended up looking amazing in our kitchen. We had him do a complete remodel of our kitchen and one of our bathrooms. The guys on his crew were always prompt and showed up as scheduled. His foreman was both a good communicator and listener. Whenever we ran into an unexpected issue, they communicated clearly what additional costs would be involved (if any) and how much additional time it might take. The cabinets he installed were custom made but did not cost more than the pre-fab ones you can buy at the large home improvement stores. They are of high quality and well constructed. I actually saw his cabinet guy using a small caliper to make sure the door distances from the cabinets were all even! Lastly...here's something you'll never hear about a contractor...he finished AHEAD of time! Nathan's company are straight shooters and very skilled craftsmen. I would work with them again."
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+48

Response time8 hrs
Response rate100%
4 neighbors recently requested a quote
Avatar for HIC Builders, Inc.
HIC Builders, Inc.
5.0(
12
)
Addition to Existing Structure - Build

Serving Mission Hills, CA and surrounding areas

Approved

In business since 2017

Free estimates

Warranties offered

"HIC builders is a family owned company, and they did a terrific job at my house. We added an ADU above the garage, remodeled two bathrooms, and did other extensive work on the house. Abraham, the field manager, was responsive and available, flexible when plans needed to change to accommodate structural issues that we discover as the project progressed, and answered my endless questions. The workmen were always on time, courteous, and cleaned up the site every day before they left. Probably the easiest way to find out if HIC can provide what you want is to call Abraham Moryossef directly (818 850 5062) and chat. I know it will be a good investment of your time. They are terrific!"
Roof & exterior paint
Working on the gas line
Artificial turf project
Roof & exterior paint
Roof & exterior paint

+53

Response time2 days
Response rate100%
6 neighbors recently requested a quote
Avatar for DT Design and Build, Inc.
DT Design and Build, Inc.
4.7(
81
)
Addition to Existing Structure - Build

Serving Mission Hills, CA and surrounding areas

Approved

In business since 2014

Free estimates

Warranties offered

"Tal and his team at DT Design & Build did an amazing job on our home addition project. From the initial consultation to the final walk-through, they were professional, communicative, and focused on delivering exceptional results. Tal;s expertise in design and construction ensured that our new space seamlessly integrated with our existing home, and his team attention to detail was unmatched. We are thrilled with the outcome and would not hesitate to recommend DT Design & Build to others."
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(
14
)
Addition to Existing Structure - Build

Serving Mission 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

42 neighbors recently requested a quote
Avatar for Tulip Remodeling, Inc.
Tulip Remodeling, Inc.
5.0(
43
)
Addition to Existing Structure - Build

Serving Mission Hills, CA and surrounding areas

Approved

In business since 2016

Free estimates

Warranties offered

"I would like to extend my heartfelt thanks to Oran and the Tulip Remodeling team for their beautiful work on my home extension project. Their expertise and professionalism made the entire process easy, from concept to completion. I highly recommend Tulip Remodeling for their quality construction and excellent customer service."
Bathroom Remodel
Los Angeles Kitchen Remodel
Beverly Hills Bathroom Remodel
Los Angeles Kitchen Remodel
Beverly Hills Bathroom Remodel

+63

Response time4 hrs
Response rate100%
Recommended by94%of homeowners
Avatar for Trig Builders, Inc.
Trig Builders, Inc.
4.9(
37
)
Addition to Existing Structure - Build

Serving Mission 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 Mission 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 Mission 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 Mission 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.