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

Avatar for McCormick Home Builders, Inc.
McCormick Home Builders, Inc.
4.7(
42
)
Addition to Existing Structure - Build

Serving Suisun City, CA and surrounding areas

Approved

In business since 2017

Free estimates

Customers say: True professional

"We recently remodeled our bathroom with McCormick, and it was a fantastic experience. Khaled was informative, patient, and genuinely helpful, guiding us through choices for a perfect design. The team’s professionalism showed in their punctuality and quality. Every aspect was done with care, from tile placement to lighting. The transformation is truly impressive; the bathroom now feels open and luxurious. We’re beyond pleased with the result and look forward to more projects with them."
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+1

Response time6 hrs
Recommended by17%of homeowners
Avatar for Waters Construction Co.
Waters Construction Co.
5.0(
5
)
Addition to Existing Structure - Build

Serving Suisun City, CA and surrounding areas

Approved

Free estimates

Emergency services offered

Warranties offered

"Michael and team did such an amazing job on our bathroom remodel. They took our tiny, dysfunctional bathroom and turned it into a true master bathroom oasis in a short amount of time during the holiday season. When they had the space down to the studs, Michael sat down with us and discussed in detail the best possible use of the space and we couldn’t be happier with our final decision after going through the options. Michael was great at communicating and we still stay in touch to this day, which we truly appreciate. Great team who does great work and I will absolutely be giving Waters Construction a call for any and all future home renovations. I’ll let the pictures do the rest of the talking."
Kitchens
Kitchens
Kitchens
Kitchens
Kitchens

+14

Response time6 hrs
Response rate100%
Avatar for Cerletti & Kennedy Design-Build
Cerletti & Kennedy Design-Build
4.3(
109
)
Addition to Existing Structure - Build

Serving Suisun City, CA and surrounding areas

Approved

Super Service Award Winner

In business since 1987

Free estimates

Warranties offered

"Worked with Robert and his team to build our ADU. His experience and knowledge was helpful throughout. His team is professional and made sure all inspections passed. Would highly recommend working with him."
in the beginning
 Finished!
Wish I had a good camera
 Eat in kitchen, new wood flooring, beam ceiling
 Chefs table

+45

Response time3 days
32 neighbors recently requested a quote
Recommended by76%of homeowners
Patton Construction
4.3(
25
)
Addition to Existing Structure - Build

Serving Suisun City, CA and surrounding areas

Approved

In business since 1982

Free estimates

Customers say: Quick response

"Cal and the crew were awesome to work with. I needed two bedrooms and two bathrooms added to my house. They designed a beautiful master suite with a big closet and bathroom. And added an additional bedroom and 1/2 bath. They put in French doors in the existing master bedroom and also in the new master suite. Because of 2020 and Covid 19, there were a couple of little problems, but Cal made sure to let me know what was happening every step of the way."
custom home hall bath
custom home dining room
custom home family room
custom home
custom home

+9

Response time2 days
4 neighbors recently requested a quote
Recommended by93%of homeowners
RSF Construction Inc.
1.0(
1
)
Addition to Existing Structure - Build

Serving Suisun City, CA and surrounding areas

Approved

In business since 2019

Free estimates

Credit card accepted

RSF Construction Inc. is a leader in providing our customers with the highest quality service in an honest, efficient, and professional way. Our pledge is to create successful relationships with our customers, employees and community by building trust, treating every project with the utmost integrity and exceeding expectations. We look forward to working with you!

Avatar for W OROZCO CONSTRUCTION INC
W OROZCO CONSTRUCTION INC
New to Angi
Addition to Existing Structure - Build

Serving Suisun City, CA and surrounding areas

Approved

Free estimates

Emergency services offered

Warranties offered

Hello everybody my name is will orozco ceo of w orozco construction inc we are here to help you with your house project ADU Remodeling new construction we are a company what we staring the company from bottom we know all about construction the main goal is keep all the costumer happy with all the construction projects clean and safe

Avatar for Grid Design Build
Grid Design Build
New to Angi
Addition to Existing Structure - Build

Serving Suisun City, CA and surrounding areas

Approved

In business since 2022

Free estimates

Credit card accepted

We're a locally owned and operated company that values honesty and integrity and treats your home as if it were our own. We offer a variety of General Contractor Home Improvement services that are customizable to each individual project. We specialize in Additions and Kitchen Remodels, but also offer a wide range of expertise for a variety of other projects. We pride ourselves on the quality of our work as well as our commitment to outstanding results. We look forward to building lasting relationships and guarantee your satisfaction!

Response time2 days
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FAQs for addition to existing structure building service projects in Suisun City, 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 Suisun City, 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.