How much do addition contractors typically cost?
- San Jose, California Average$104,095
- Typical Range$64,794 - $143,485
- Low End - High End$14,000 - $242,000
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Service Pros
San Jose, CA·
Kitchen Remodels, Major Renovations , ADU , Design service, roof , and 2 more
"Loved the bathroom makeover by this team! They were honest, on time, and made sure everything was perfect before moving to their next project. Super friendly and the work is top-notch. My bathroom looks amazing - exactly what I wanted. Highly recommend them for a great job done."
Gregorio _. in December 2024
Sunnyvale, CA·
Garage Remodels, Kitchen Remodels, Bathroom Remodels , and 1 more
"We recently worked with Rose Remodeling & Design to add a new room to our home, and the experience was fantastic! Adir, the project manager, was incredibly helpful from day one. He walked us through the entire process, addressed all of our questions, and kept us updated at every step. The crew was professional and efficient, and the new space is perfect. It blends seamlessly with our existing home, and we could not be happier with the quality of the work."
Aaron C S. in December 2024
HC
San Jose, CA·
Doors, Carpentry, Plumbing , and 1 more
"Karol was very kind and professional. He listened to our needs and desires and delivered. We are very pleased with Karol’s team and the job they have done and look forward to hiring Herman Construction again for our next home improvement project."
Stephen F. in September 2024
Redwood City, CA·
Addtions Remolding
"I am so happy I hired Unique Home Design & Remodeling for my bathroom remodel. I had never worked with this company but hen I saw my friends remodeled bathroom I asked him for contact and he gave me contact of this company. They were honest from start to finish, my new bathroom looks even better than from my friends and price was reasonable. Highly recommend!"
Martin B. in September 2019
San Jose, CA·
Remodel, New Construction, Addition , and 4 more
"MJ & his team were top notch at communication and met our deadline for our new construction home."
Laura Z. in October 2024
San Jose, CA·
General Contractor
"Gabriel and his team did a Fantastic job.!!!"
angel F. in November 2024
Campbell, CA·
Home Additions, New Home Construction, General Contractor , and 2 more
"I also had recessed lighting installed. Job was done perfectly."
Donna F. in May 2024
San Jose, CA·
Kitchen Remodel, Room Additions, ADU (accessory dwelling unit) , and 2 more
"Ohad Regev came over and explained his work on the deck to be replaced. He went over everything and answered all my questions. He wrote up a quote right there on the spot. He was very pleasant and practiced social distancing and wore a mask. I felt very comfortable doing business with him."
Laura C. in June 2020
SAN JOSE, CA·
Major Renovations, Remodels, Additions , and 4 more
"My wife and I hired Sam and his team to remodel our kitchen countertop, cabinets, and lighting. We honestly had no idea where to start before talking to Sam and BayBuilders. With their team, we were given guidance and options on material, styles, install leadtime, and any miscellaneous FAQs. It was a great experience and weâ re very happy with the quality of work. Highly recommend!"
Rickie P. in December 2023
Showing 1-9 of 44 results
Costs for related projects in San Jose, CA
- Build an Addition$64,794 - $143,485
- Demo an Interior$946 - $4,364
- Perform Home Renovations and Repairs$6,556 - $15,592
- Remodel or Renovate a House$65,487 - $152,227
Frequently asked questions
- It’s important that you verify their license is still in good standing. Also keep in mind that certain states or provinces don’t require licensing if the job is under a certain dollar amount.
- You can find a list of your state’s licensing requirements on the HomeAdvisor website. Before you get to work with the pro, make sure their qualifications are current and acceptable to you.
- It is always a good idea to get a copy of the pro’s insurance certificate for future records, and in case anything happens. This is a good way to feel more secure in your home project, and to weed out potential scammers.
HomeAdvisor makes it easy to connect with pros near you. You can read reviews, get quotes and book appointments all in one place.
Depending on the type of project, you may find subtle differences in the hiring process. Here’s a look at task-specific advice.
You can use HomeAdvisor to help evaluate a contractor’s qualifications. We put pros through a screening process, and award badges to high-performing contractors. You can find these badges on a pro’s HomeAdvisor profile, and sometimes, his or her website.
Your research doesn’t stop here. Once you’ve found a few prospective companies, make an call to ask a few questions about work history, licensure and more:
- Have you completed a job like this before?
- Do you have a list of references I can contact?
- When are you able to start the job?
In most cases, the responses you get to these three questions will give you a very good idea of the right pro for your project. If you have more than one front-runner, these additional questions can help you narrow it down.
- How many years of experience do you have?
- What’s your permanent business address?
- Are you licensed to work in my area?
- When did you earn your business license?
- How do you handle warranty service complaints?
- Do you have worker’s compensation, property damage and personal liability insurance?
Any good contractor will answer these questions, and most will appreciate dealing with a client that takes such an active interest in finding good service. On the other hand, if a contractor gives you a hard time with these questions, you probably want to find someone else.
Related Projects in San Jose, CA
HomeAdvisor Community Rating
Overall Rating:
San Jose Addition & Remodeling Contractors are rated 4.7 out of 5 based on 409 reviews of 409 pros.
The HomeAdvisor Community Rating is an overall rating based on verified reviews and feedback from our community of homeowners that have been connected with service professionals. See individual business pages for full, detailed reviews.
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Recent Job Requests for Addition & Remodeling Contractors in San Jose, CA
Project Location: San Jose, CA Date: 02/05/24Type of Addition: Detached additionProject Description: Build - use existing architectural drawingsWhat types of rooms/spaces are you interested in adding to your home?: Bathroom(s)What types of rooms/spaces are you interested in adding to your home?: KitchenWhat types of rooms/spaces are you interested in adding to your home?: Living/family roomWhat types of rooms/spaces are you interested in adding to your home?: Bedroom(s)Comment: We want to build an ADU . We already have the architectural designs .Project Location: San Jose, CA Date: 02/04/24Type of Addition: Ground level additionProject Description: Build - use existing architectural drawingsWhat types of rooms/spaces are you interested in adding to your home?: Bathroom(s)What types of rooms/spaces are you interested in adding to your home?: Bedroom(s)Project Location: San Jose, CA Date: 02/03/24Type of Addition: Ground level additionProject Description: Design and buildWhat types of rooms/spaces are you interested in adding to your home?: KitchenWhat types of rooms/spaces are you interested in adding to your home?: Living/family roomWhat types of rooms/spaces are you interested in adding to your home?: Bedroom(s)Comment: Customer did not provide additional comments. Please contact the customer to discuss the details of this project.Project Location: San Jose, CA Date: 02/02/24Reason for Cable: 1Type of Addition: Convert or finish existing spaceProject Description: Build - use existing architectural drawingsWhat types of rooms/spaces are you interested in adding to your home?: Bedroom(s)What types of rooms/spaces are you interested in adding to your home?: OtherComment: Customer did not provide additional comments. Please contact the customer to discuss the details of this project.Project Location: San Jose, CA Date: 01/28/24Desired Completion Date: Timing is flexibleRequest Stage: Planning & BudgetingProject Description: Design and buildComment: I have a 2400 single story house l. Planning to build second story to move 3 bedrooms to upstairsProject Location: San Jose, CA Date: 01/28/24Reason for Cable: 2Desired Completion Date: More than 2 monthsRequest Stage: Planning & BudgetingRequires Work on Historical Structure: NoRequest for Commercial Location: NoProject Description: Design and buildWhat type of second floor addition will this be?: Full additionRooms Included:: Bedroom(s)Rooms Included:: BathroomComment: 3 bedroom 2 bathroom house need to make it 5 bedroom to 3 bathroomProject Location: San Jose, CA Date: 01/26/24Type of Addition: Ground level additionProject Description: Design and buildWhat types of rooms/spaces are you interested in adding to your home?: Bedroom(s)Comment: We have a back patio that we want to tear down and make a bedroom but still have the sliding door that leads from the house to patio be the room door so adding the three walls to make the room is idea also from inside the house once you walk out the sliding doors there's two steps would also keep those so it would still need the floor foundation but wouldn't have to be same level as the sliding door.Project Location: San Jose, CA Date: 01/21/24Type of Addition: Ground level additionProject Description: Design and buildWhat types of rooms/spaces are you interested in adding to your home?: Living/family roomWhat types of rooms/spaces are you interested in adding to your home?: Bedroom(s)What types of rooms/spaces are you interested in adding to your home?: OtherComment: Plan 1: Expand to add one drawing room and an office room attach with it with a half bathroom. Plan2: Second floor addition - One Master bed room suit with attached full bathroom and a balcony and an office room. Plan 3: One master bed room suit in ground floorProject Location: San Jose, CA Date: 01/21/24What best describes this home addition project?: Build from existing designsWhat kind of addition do you want?: Convert or finish existing spaceWhat room(s)/space(s) are you interested in adding to your home?: Living/family roomWhat best describes this project?: Addition to homeWhat room(s)/space(s) are you interested in adding to your home?: Bathroom(s)What room(s)/space(s) are you interested in adding to your home?: Bedroom(s)What room(s)/space(s) are you interested in adding to your home?: KitchenComment: Garage conversion into 1 bedroom ADU under 450 sf.Project Location: San Jose, CA Date: 01/20/24Type of Addition: Ground level additionProject Description: Design and buildWhat types of rooms/spaces are you interested in adding to your home?: Bathroom(s)What types of rooms/spaces are you interested in adding to your home?: Bedroom(s)Comment: Building a room in the backyardProject Location: San Jose, CA Date: 01/20/24Type of Addition: Ground level additionProject Description: Design and buildWhat types of rooms/spaces are you interested in adding to your home?: KitchenProject Location: San Jose, CA Date: 01/19/24Type of Addition: Ground level additionProject Description: Design and buildWhat types of rooms/spaces are you interested in adding to your home?: Bedroom(s)Comment: We are exploring as a family whether to consider moving or, to potentially build out a downstairs bedroom and upstairs addition (office/bedroom). The current floor plan is not working for us.Project Location: San Jose, CA Date: 01/18/24Type of Addition: Ground level additionProject Description: Build - use existing architectural drawingsWhat types of rooms/spaces are you interested in adding to your home?: Bathroom(s)Comment: Customer did not provide additional comments. Please contact the customer to discuss the details of this project.Project Location: San Jose, CA Date: 01/17/24Type of Addition: Ground level additionProject Description: Design and buildWhat types of rooms/spaces are you interested in adding to your home?: KitchenWhat types of rooms/spaces are you interested in adding to your home?: Living/family roomWhat types of rooms/spaces are you interested in adding to your home?: OtherComment: Looking to remodel the kitchen, push the living room forward and fix the roof of the garage to be an A frame instead of flat.Project Location: San Jose, CA Date: 01/16/24Type of Addition: Second story additionProject Description: Design and buildWhat types of rooms/spaces are you interested in adding to your home?: Bathroom(s)What types of rooms/spaces are you interested in adding to your home?: Living/family roomWhat types of rooms/spaces are you interested in adding to your home?: Bedroom(s)Comment: Looking to add on to our home and up adding a 2nd level. Would take the home from 1233 sq ft to ~ 2100 sq ft. We would be adding more living room space on the ground floor and 2 bedrooms and 2 bathroom on the 2nd floorProject Location: San Jose, CA Date: 01/16/24Type of Addition: Detached additionProject Description: Build - use existing architectural drawingsWhat types of rooms/spaces are you interested in adding to your home?: OtherComment: ADU foundationProject Location: San Jose, CA Date: 01/11/24Type of Addition: Ground level additionProject Description: Design and buildWhat types of rooms/spaces are you interested in adding to your home?: Bathroom(s)What types of rooms/spaces are you interested in adding to your home?: KitchenWhat types of rooms/spaces are you interested in adding to your home?: Bedroom(s)Project Location: San Jose, CA Date: 01/10/24Desired Completion Date: Timing is flexibleRequest Stage: Planning & BudgetingRequires Work on Historical Structure: NoRequest for Commercial Location: NoProject Description: Build - Use existing architectural drawingsRooms Included:: KitchenRooms Included:: Bedroom(s)Rooms Included:: Living/Family roomRooms Included:: BathroomWhat type of guest house/casita addition will this be?: Remodel existing spaceWhat type of guest house/casita addition will this be?: Detached additionComment: Wish to convert a 530 sq ft garage into an ADU.
