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

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

Serving Porter Ranch, 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
7 neighbors recently requested a quote
Recommended by100%of homeowners
Avatar for KN Remodeling & Supplies Inc
KN Remodeling & Supplies Inc
4.8(
63
)
Addition to Existing Structure - Build

Serving Porter Ranch, CA and surrounding areas

Approved

In business since 2012

Free estimates

Warranties offered

"Working with Nathan & KN Remodeling was the best decision we made when undertaking our garage conversion job. Nathan understood exactly what we wanted, knew our budget parameters and provided us with a range of options that helped us stay within what we were seeking to spend. We wanted it to be NICE, but didn't need to over-do any of the finishes and spend needlessly on areas that were going to be used in-frequently. The end result was fantastic. The workmanship was of the highest order, the job was executed efficiently and with constant communication and oversight. The whole job was stress free and delivered on time. I can't recommend KN Remodeling highly enough!"
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+48

Response time8 hrs
Response rate100%
5 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 Porter Ranch, CA and surrounding areas

Approved

In business since 2014

Free estimates

Warranties offered

"We hired DT Design and Build for a home addition project, and we are thrilled with the results. Tal and his team were professional, knowledgeable, and a pleasure to work with from start to finish. They communicated with us regularly throughout the project, keeping us informed of progress and addressing any concerns promptly. The finished addition seamlessly integrates with our existing home, and the craftsmanship is top-notch. We would highly recommend DT Design & Build to anyone in need of a skilled, reliable contractor."
New house
New house
Bathroom
Livingroom
Bathroom

+43

Response time9 hrs
Response rate97%
Recommended by100%of homeowners
Avatar for Construction Masters
Construction Masters
4.7(
319
)
Addition to Existing Structure - Build

Serving Porter Ranch, CA and surrounding areas

Approved

Super Service Award Winner

In business since 1988

Free estimates

Emergency services offered

"Construction Masters did an outstanding job on our ADU build. Their teams were professional, organized, and easy to communicate with throughout the entire process. They helped bring our vision to life while offering helpful suggestions along the way. The quality of work was top-notch, from framing and finishes to the final details. Everything was completed on schedule and within budget, which made the experience stress-free. The crew kept the job site clean and respectful at all times. We?re extremely happy with how the ADU turned out?it looks amazing and feels like a completely custom space. I highly recommend Construction Masters to anyone looking for a reliable and skilled construction company."
Our Assorted Work
Our Assorted Work
Our Assorted Work
Our Assorted Work
Our Assorted Work

+51

Response time8 hrs
1 neighbors recently requested a quote
Recommended by93%of homeowners
Avatar for YB Builders Group Inc.
YB Builders Group Inc.
5.0(
13
)
Addition to Existing Structure - Build

Serving Porter Ranch, 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

58 neighbors recently requested a quote
Avatar for Platinum Home Builders & Design, Inc.
Platinum Home Builders & Design, Inc.
5.0(
75
)
Addition to Existing Structure - Build

Serving Porter Ranch, CA and surrounding areas

Approved

In business since 2020

Free estimates

Warranties offered

"I came to know about Platinum Home Builders from a friend. We were having our first child and wanted to have a specially prepared room for her. I was very impressed with their approach. I should say that I am very satisfied with their work."
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 Trig Builders, Inc.
Trig Builders, Inc.
4.9(
37
)
Addition to Existing Structure - Build

Serving Porter Ranch, CA and surrounding areas

Approved

In business since 2004

Free estimates

Warranties offered

"Trig Builders is an excellent one-stop shop for mainly excellent design, great help in selecting final materials/accessories and mainly for any complete home remodeling. Our master bathroom and kitchen needed to be completely demolished and redesigned. Yossi met with us several times and by listening to us and to what we want to get, he was able to come up with a new concept that included all the ideas and goals of what we wanted to have and his design was very clean, modern while still be within our budget. Yossi also managed and handled all the orders and purchased of the materials and final accessories which caused us to write this review because this was an excellent service. The bathroom was gutted and after the demolition, Yossi and his guys discovered that the floor support beams were damaged so we had to replace them with new ones and to have the floor leveled before they could start the new construction. This problem caused the budget increased by a small cost (Yossi charged us only for the materials) for the overall budget. All the professional people that were involved in the work including the plumber, drywall man, electrician and tile man were excellent and skilled people that executed their part in a very high level of work results. They were very careful about all the cleaning aspect by dropping cloths, plastic wraps for the floors. The kitchen was completely redesigned and Yossi was able to include everything we wanted and needed. He went with us prior to the work and helped us purchasing all the materials appliances. The remodeling job was a week behind the original schedule because of the floor problem and due to few days when we had to leave the house for personal reasons on top of complications in getting the necessary inspections completed. We must mention here that any of the delays was not caused because of Trig Builders fault. We are very happy and satisfied with Yossi, the workers and all the skilled people and mainly Trig Builders as the company and we highly recommend them."
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 Porter Ranch, CA and surrounding areas

Approved

Super Service Award Winner

In business since 2006

Free estimates

Emergency services offered

"My wife and I decided to remodeling our kitchen, after a few estimates that we got we choose imperial remodeling inc to Start the job. It’s a very trust and liable company. We are setecfied with the job and the price as well. And definitely we are more then happy with the results. Thank you imperial for make our dream to come true ."
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+185

Response time1 day
Recommended by89%of homeowners
Avatar for R Design, Inc.
R Design, Inc.
4.3(
31
)
Addition to Existing Structure - Build

Serving Porter Ranch, CA and surrounding areas

Approved

In business since 2007

Free estimates

Small jobs welcome

"If I could give 10 stars, I would. Ramy was affordable, the highest quality work and super responsive. I am willing to share my experience if you need further details. 484-640-9574. Joe Lugo Proud owner of fully renovated Buisness"
 Joining dining room to kitche
 Cabinets, granite counter, marble/granite floor
 Bath tub wall tiling
 Restaurant previous counter
 Marble

+193

Response time1 day
Response rate99%
12 neighbors recently requested a quote
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FAQs for addition to existing structure building service projects in Porter Ranch, 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 Porter Ranch, 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.