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

Avatar for BUILDERS GROUP & DESIGN INC
BUILDERS GROUP & DESIGN INC
5.0(
21
)
Addition to Existing Structure - Build

Serving Napa, CA and surrounding areas

Approved

In business since 2025

Free estimates

Warranties offered

"Our bathroom was outdated and unattractive, so we wanted to hire a professional to help with the design and get the job done right. We found Builders Group on Angie, and Mike came out to give us a quote. What set Mike apart from the others was his attention to detail and how great he was with people. We decided to hire him, and we were happy with our choice from the very beginning."
South San Francisco
South San Francisco
South San Francisco
South San Francisco
South San Francisco

+139

10 neighbors recently requested a quote
Avatar for Cerletti & Kennedy Design-Build
Cerletti & Kennedy Design-Build
4.3(
109
)
Addition to Existing Structure - Build

Serving Napa, 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
27 neighbors recently requested a quote
Recommended by76%of homeowners
Avatar for Build Atlas
Build Atlas
5.0(
13
)
Addition to Existing Structure - Build

Serving Napa, CA and surrounding areas

Approved

Super Service Award Winner

In business since 2008

Free estimates

Emergency services offered

"If you’re thinking about getting a new roof, definitely go with Build Atlas. I’m in my mid-20s and had no idea where to even start, but a neighbor recommended them and I’m so glad that they did! The whole team was super friendly, down-to-earth, and made the entire process way less stressful than I imagined. They showed up when they said they would, kept everything clean, and finished faster than I expected. Plus, the roof looks fantastic — it’s like my house got a facelift! It’s rare to find a company that’s this easy to work with!"
Updated Tile Flooring
Updated Vanity & Fixtures
Added Shelving & Accessories
Newly updated kitchen
Outdated Kitchen

+19

Response time5 hrs
Recommended by76%of homeowners
Avatar for J R A Construction
J R A Construction
5.0(
12
)
Addition to Existing Structure - Build

Serving Napa, CA and surrounding areas

Approved

In business since 2005

Free estimates

Small jobs welcome

"Outstanding work from start to finish. The quality of the workmanship exceeded my expectations, and the project was completed on time and within budget. I would definitely recommend this company to anyone needing construction work. Great communication, quality craftsmanship, and fair pricing."
Full kitchen remodel
Bathroom remodel
All kitchen remodel
All kitchen remodel
Concrete patio

+51

Response time2 days
5 neighbors recently requested a quote
Recommended by8%of homeowners
Avatar for Kuertz Construction
Kuertz Construction
4.9(
18
)
Addition to Existing Structure - Build

Serving Napa, CA and surrounding areas

Approved

In business since 2020

Free estimates

Credit card accepted

"We worked with Kuertz construction and Nate on a Kitchen, Family room and Backyard remodel project. Nate was excellent in consulting with us and providing creative ideas for the redesign to keep us on budget. The work was of excellent quality, and was done on time and the attention to detail certainly stands out. Overall, Nate was great to work with and we would highly recommend him. We have gone back to him for several smaller projects and have referred him to our friends."
Modern Kitchen and Patio
Modern Kitchen and Patio
Modern Kitchen and Patio
Modern Kitchen and Patio
Modern Kitchen and Patio

+17

3 neighbors recently requested a quote
Recommended by88%of homeowners
Avatar for Deleon E Hijo Construction
Deleon E Hijo Construction
5.0(
7
)
Addition to Existing Structure - Build

Serving Napa, CA and surrounding areas

Approved

Super Service Award Winner

In business since 2001

Free estimates

Offers commercial services

"Joe, Abel, and Crew did an awesome job building our 28’x8’ Timbertech deck, 25’ elevated on a hillside. Joe worked closely with the Mill Valley permitting office to get the engineering plans approved, and once we got the green light the deck shot right up! We’re extremely happy we chose them to build the deck and would happily recommend for anyone looking at similar projects."
Apartment Remodel
Apartment Remodel
Apartment Remodel
Apartment Remodel
Apartment Remodel

+6

Response time4 hrs
Response rate100%
8 neighbors recently requested a quote
Avatar for A.M.P. Construction
A.M.P. Construction
5.0(
6
)
Addition to Existing Structure - Build

Serving Napa, CA and surrounding areas

Approved

In business since 1999

Free estimates

"I highly recommend Robert at A.M.P. Construction for all construction work. He has worked on several projects at my house including remodeling my kitchen and bathrooms. I truly enjoy working with Robert. He is personable, responds promptly, arrives on time, offers great suggestions, does exceptional work, and is always honest with the cost. He is the only contractor I want to work with."
Additional Photos
Additional Photos
Additional Photos
Additional Photos
Additional Photos

+13

Response time1 day
Response rate100%
2 neighbors recently requested a quote
Avatar for Alpine Premium Construction
Alpine Premium Construction
5.0(
7
)
Addition to Existing Structure - Build

Serving Napa, CA and surrounding areas

Approved

Free estimates

Offers commercial services

"GREAT WORK GREAT COMMUNICATION. Jay listened to our needs and wants, gave us the right price and delivered on time when it came to completing a very nice master bath remodel for us. Thank you Jay!! ( we did not feel like we were juggled in between other customers which is a huge plus for us)."
Alpine Premium
13 neighbors recently requested a quote
Patton Construction
4.3(
25
)
Addition to Existing Structure - Build

Serving Napa, 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
3 neighbors recently requested a quote
Recommended by93%of homeowners
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FAQs for addition to existing structure building service projects in Napa, 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 Napa, 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.