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

Avatar for HA My Design, Inc.
HA My Design, Inc.
5.0(
379
)
Addition to Existing Structure - Build

Serving Duarte, CA and surrounding areas

Approved

Super Service Award Winner

In business since 2011

Free estimates

Customers say: True professional

"I recently worked with HA My Design to build an ADU, and I could not be happier with the results. Golan and his crew were always on time and worked hard to ensure the project was completed within budget. The quality of their work was excellent, and they were quick and efficient. I highly recommend HA My Design for anyone looking to build an ADU. Their one-stop-shop showroom, covering 5000 square feet, made selecting finishes a breeze. I will definitely refer them to friends and family!"
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 Duarte, 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

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 Duarte, CA and surrounding areas

Approved

In business since 2012

Free estimates

Warranties offered

"We worked with Nathan to remodel our first house this year. As first-time renovators and first-time home owners, it was a daunting task. Nathan made us feel very well taken care of he has a strong attention to detail, and we felt we knew what we were getting throughout the project. We settled on a price up front for all of the labor, with the promise that even if things came up during the project, Nathan would take care of the complications without changing the price. He kept that guarantee. We ended up expanding our job to include other work, but all of the initial work was done at the promised price with no surprises. We are now living in our renovated house, and we love it. I couldn't imagine organizing such a huge project myself, and we're deeply grateful to have had someone as reliable as Nathan taking care of everything!"
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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 Duarte, 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%
7 neighbors recently requested a quote
RET Construction Corp
5.0(
37
)
Addition to Existing Structure - Build

Serving Duarte, CA and surrounding areas

Approved

In business since 2004

Free estimates

Emergency services offered

"My wood balcony has termites and water damages. So I hired RET to do the job. Kevin gave estimates and recommended composite planks for floor and red woods for railings. His workmanship was very professional and finished on time! On top of that, Kevin updated my balcony to the latest building codes. His price is very reasonable. If you want cheap prices and lousy jobs,hire someone else! Highly recommended!"
Response time4 hrs
3 neighbors recently requested a quote
Recommended by77%of homeowners
Avatar for YB Builders Group Inc.
YB Builders Group Inc.
5.0(
14
)
Addition to Existing Structure - Build

Serving Duarte, CA and surrounding areas

Approved

In business since 2025

Free estimates

Credit card accepted

"We hired Ben to remodel our living room and kitchen, which included adding approximately 300 square feet, creating an open floor plan, and removing an enormous brick fireplace in the center of our house. From day one, Ben was amazing to work with. He was on budget, on schedule, professional throughout the entire project, and consistently anticipated potential issues before they became problems. His wealth of experience was incredibly valuable when it came to making decisions along the way, and he was always willing to offer thoughtful advice and guidance. His entire team was fantastic as well: professional, respectful, and clearly committed to doing quality work. We couldn’t be happier with the results and our experience working with Ben. We highly recommend Ben for any remodeling, building, or construction project!"
Bathroom Remodel
Master bathroom
Master bathroom
Master bedroom
Kitchen Remodel

+74

42 neighbors recently requested a quote
Avatar for MF Construction & Design Inc
MF Construction & Design Inc
4.5(
82
)
Addition to Existing Structure - Build

Serving Duarte, CA and surrounding areas

Approved

In business since 1994

Free estimates

Emergency services offered

"Mike Mamen called back within the hour. Next day I showed him the problems with my 90-year-old garage's roof and wiring. He tell me that existing 2x4 rafters could be sistered rather than replaced with 2x12. Additional 2x6 tie beams across garage. He recommended all new shingles, garage door, side door, window, lights, and outlets. Exterior paint on stucco and wood trim. Mike recommended replacing the house 100A electric service panel with 200A, in addition to trenching a conduit between house and garage. He also recommended grading behind the garage to route water away from its foundation. Also, adding gutters and downspouts to both the garage and house. Later we discovered that the house's facia needed to be replaced. He drove me to two current job sites, introduced his crew, and showed the work being done. Mike is knowledgable, direct, friendly, and talkative. Listens to my concerns and ideas, then presents options and his recommendations. Responds to later questions and text messages. Knows local building codes and permitting process. Works by the book -- written contract proposals describe the job and materials. Flexible in handling changes and unexpected glitches. Does minor tasks gratis. Personally attends inspections. Likewise, foreman and electrician Luis is friendly and competent. I am pleased with the competence and results of MF Construction and Design. The entire job took about seven weeks. It was more expensive than I would have thought. OTOH I did not get other bids."
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+30

Response time2 days
2 neighbors recently requested a quote
Recommended by96%of homeowners
Avatar for Platinum Home Builders & Design, Inc.
Platinum Home Builders & Design, Inc.
5.0(
75
)
Addition to Existing Structure - Build

Serving Duarte, CA and surrounding areas

Approved

In business since 2020

Free estimates

Warranties offered

"I recently used Platinum Builders for a new home addition and had a very positive experience. As an engineer with extensive experience building and renovating homes, I originally planned to manage the project myself and subcontract each phase. However, with frequent work and travel, I realized I needed a turnkey solution. Devon, my project manager, was professional, honest, responsive, and worked around my schedule. Although two other quotes were substantially lower, I chose Platinum because of my confidence in their team. The footing and framing crews were excellent. When quality issues arose during finishing, Devon quickly addressed them. I would definitely choose Platinum Builders again."
DRIP EDGE FLASHINGS
SURE NAIL TECHNOLOGY SHINGLE BY OWEN'S CORNING
TITANIUM UDL 50 UNDERLAYMENT
INSTALLATION OF NEW COOL ROOF SHINGLES
SYNTHETIC ROOFING UNDERLAYMENT

+80

Response time11 hrs
Response rate93%
Recommended by88%of homeowners
Avatar for Skyline Konstruction
Skyline Konstruction
4.9(
11
)
Addition to Existing Structure - Build

Serving Duarte, CA and surrounding areas

Approved

In business since 2016

Free estimates

Warranties offered

"Skyline converted our attached garage into a beautiful ADU with quality workmanship, fair pricing, and top notch materials. They were very particular with respect to details, which made a huge difference in the end. I would strongly recommend skyline and will use no other company for any project, large or small. If you want the job done right, with transparency and professional service from start to finish, look no further!"
Restroom
Home remodel
Laundry
Home remodel
Laundry

+93

Response time2 days
Response rate100%
8 neighbors recently requested a quote
Avatar for Imperial Remodeling Inc
Imperial Remodeling Inc
4.6(
128
)
Addition to Existing Structure - Build

Serving Duarte, CA and surrounding areas

Approved

Super Service Award Winner

In business since 2006

Free estimates

Emergency services offered

"

Everything went very well.  The job took a little longer than expected (estimate was about 3 weeks for the whole job, but it took almost 4).   I was okay with that because it was a very big job, and I had a feeling it may take a little longer anyways.  I am happy that they didn't rush through anything just to meet a deadline. 

Gino was great to work with and gave me many great ideas for tile colors and designs, as well as colors and designs for the custom vanity and countertop.  He also made sure that the different specialist crews started their respective phases of the project on schedule and ensured that there was seamless transition from one phase of the project to the next.  The cost of the project may seem like a lot, but that is because it is a very big bathroom.  I also requested to add a few things such as more lighting as the project went on, so that added a little to the cost.  I gave the pricing a B instead of A because Gino went with a higher quality/higher cost lighting whereas I would have been okay with a lower cost lighting option from Home Depot or Lowe's.  That isn't a big deal though and is partially my fault since I could have done my own research and instructed him to go with the lower cost option.  However Gino is all about delivering a very high quality product, so his choice of lighting is consistent with that. 

Gino also makes himself available to rectify any lingering issues that may arise after the job is complete.  One example is that the water wasn't going down the drain of the shower properly the first time I used the shower, however when I brought it up to him, Gino came out and took care of the issue the same day.  It turned out to be a little debris blocking the drain from the tiling, which had to be cleared out, so not a big deal.  That gave me assurance that should anything else arise (I doubt anything will) in the future that he will come back and take care of it.    

Overall I am very satisfied with the job.  Everything was very well planned out, the communication from Gino was outstanding, and although the job took slightly longer, that wasn't a big deal because the excess time ensured increased quality.  I would recommend Gino and his crew for any job, big or small! 

"
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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 Duarte, 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 Duarte, 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.