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
DC
Pittsburg, CA·
Kitchen Renovation, Additions, Deck Builds , and 8 more
"I hired Dynamicz Construction after interviewing 3 other companies! I had an amazing first impression with Zamir my project manager and he came through on everything he promised. We gutted our entire kitchen / dining area , re did wiring , re did plumbing , installed new windows and a new sliding door. We had a great experience working with them and they managed to finish a few days ahead of schedule! Definitely would recommend them and will definitely be using them in the future."
9D3DF15282B05CD4B2EB057DE3A539175C617AF269FCCFEAEA16ECFD798AF437 D. in May 2024
San Jose, CA·
Renovations, Landscaping, Roofing , and 1 more
"I recently had my roof replaced by OT Bay Builders, and I couldn?t be happier with the results! From the initial consultation to the final inspection, their team was professional, punctual, and detail-oriented. They provided a thorough assessment, offered a fair quote, and completed the project ahead of schedule. The crew was respectful of my property, ensuring a spotless cleanup after the job was done. The new roof looks amazing and has already stood up to heavy rain without any issues. I highly recommend OT Bay Builders for anyone looking for reliable and high-quality roofing services!"
8B0DAA5056D43542C603229481BBC3DC9EBA7A24DDE9B204D63804526E2649D5 9. in March 2025
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
Sunnyvale, CA·
Garage Remodels, Kitchen Remodels, Bathroom Remodels , and 1 more
"After seeing 5 different contractors (Which was overwhelming) Iâ ve decided to hire rose Remodeling. Adir was my main contact and he did a great job communicating throughout the project and he had some amazing design ideas for my master bathroom that Iâ ve never even thought of. I would highly recommend rose Remodeling!"
Mark A. in June 2023
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
San Jose, CA·
Remodel, New Construction, Addition , and 4 more
"Due to my toilet flooding my bathroom flooded and I was not in the market for getting a bathroom remodel done due to budget constraints. However when MJ gave me a price for the restorative work he mentioned he would be able to offer a good price for the bathroom remodel. His price for the bathroom remodel was in my budget and after the work was done I was very pleased to have chosen that route. It was marvelous working with Mr MJ!"
Debra I. in December 2024
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
Sunnyvale, CA·
Full Service Plumbing Company, Full Service Electric Company, Full Service Surveillance Needs , and 2 more
"The experience with Sanjeev and his team was phenomenal. Joe and Walter are his right and left hand guys. They all made sure that I fully understood the scope of the project before providing a very detailed written AND visual proposal, which my HOA appreciated. They completed the project on time and kept me in the loop as they ran into small hurdles. Overall, they're a bunch of really creative thinkers and were able to help solve issues as they ran into some complexity with the project. What was neat is that they involved me every step of the way to make sure that I was comfortable as they progressed. I would highly recommend Sanjeev and his team to help with any home remodeling project. They are truly experts in this arena."
Samuel L. in April 2021
BC
Santa Clara, CA·
Bathroom Remodels, Kitchen Remodels, Additions , and 2 more
"Excellent communication. Execution was outstanding. Very able people worked hard and long and got the job done in a most timely manner. Detail work was first rate. When something needed to be adjusted that was done. Some of the adjustments were just amazing. (We had a built in Murphy Bed installed that did not quite fit the space. A tapered base board kept this from looking awkward. Amazing!) Also all the folks were very nice. Add reasonable pricing and there is nothing else to ask for. I liked them so much that when my daughter did a major remodel, I recommended Baja, and she too has been super happy with the results. Where I come from, passing a vendor on to family is the highest form of praise."
ted A. in October 2018
Showing 1-9 of 27 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 4.8 out of 5 based on 502 reviews of 502 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.
