Q: Are hidden rooms legal?

Yes, hidden rooms are legal, as long as they meet all local building regulations. If you sell your house, most states require homeowners to disclose full houseplans, which would include any hidden rooms.

Q: What should be in a safe room?

If your secret room is a safe room, it should contain a means of communication aside from a cell phone, such as a shortwave radio. You should also have plenty of drinking water, a portable generator, emergency food supplies, blankets, pillows, flashlights, batteries and a first aid kit.

Q: Does a secret room add value to your home?

Any time you update your home’s square footage, you increase its value, but a secret room is a niche feature that doesn't rank high on every buyer’s list of must-haves. Investing your money in remodeling more common living areas like bedrooms, bathrooms, or kitchens will have a higher ROI than adding a secret room. Many secret rooms can act as entertainment spaces (think a game room or wine cellar) or quiet spaces (a library or study), so when building your secret room you may want to consider its versatility for when you’re ready to sell.

Hon's Construction, Inc.

Hon's Construction, Inc.

Customers say: Quick response

Recommended by 100% of Angi customers

10 years of experience

Hon's Construction, Inc. is committed to excellence in every aspect of our business. We uphold a standard of integrity bound by fairness, honesty, and personal responsibility. Our distinction is the quality of service we bring to our customers. Accurate knowledge of our trade combined with ability is what makes us true professionals. Above all, we are watchful of our customers' interests, and make their concerns the basis of our business.

"N/A"

Donna M on June 2011

Hon's Construction, Inc. is committed to excellence in every aspect of our business. We uphold a standard of integrity bound by fairness, honesty, and personal responsibility. Our distinction is the quality of service we bring to our customers. Accurate knowledge of our trade combined with ability is what makes us true professionals. Above all, we are watchful of our customers' interests, and make their concerns the basis of our business.

"N/A"

Donna M on June 2011

GAXL GENERAL CONSTRUCTION

20408 SAN MIGUEL AVENUE

GAXL GENERAL CONSTRUCTION

20408 SAN MIGUEL AVENUE

Customers say: Quick response

Recommended by 100% of Angi customers

22 local quotes requested

For the past 10 years GAXL has gained a reputation as a well trusted general construction company in the Bay Area. We depart from the idea that our clients deserve the best remodeling experience. The main focus for us is finishing the work right the first time and on-time, always within budget. At GAXL General Construction we are aiming to be a company leader in the market in Northern California in which our clients can trust with 100% confidence their construction/ remodeling needs. We strive to be consistent as well as efficient in the delivery of our services, and offer our clients a one-stop source for their construction and remodeling needs. Once again, thank you!, we are looking forward to speaking with you about your next project; big or small, we are here for you! How about that new deck or gazebo? Are you ready for those family gatherings? Want to turn your backyard into your new summer/fall hang out spot? We will make sure we bring you creative solutions done perfectly right with the help of our experts. Let's talk today! -Building with Vision.

"We received quotes from 3 different contractors. We chose GAXL because it's close to Newark and I like how Jose explains everything in detail. Originally we thought the remodeling would take 4 weeks but it took close 6 weeks. The whole project was great, the craftsmanship was superb. At one point, we found some tiles that are not very nice (from the manufacturer) and we asked them to redo the bathroom wall. They don't complain and understand our request. The workers are great, especially Marvin and this other guy (forgot his name). They WORK very very hard from 8a to 6p everyday. Jose is on time and is very prompt in returning calls or text. In fact he's the only contractor who's very prompt and I like that! On one of the walls they discovered a mold due to rain leaking and they're able to fix it in 4 days which is great. Jose and his son pickup the materials from the suppliers and drop them in our house. Overall, Jose and his men are courteous. I will definitely use GAXL for future remodeling."

Johann W on February 2025

For the past 10 years GAXL has gained a reputation as a well trusted general construction company in the Bay Area. We depart from the idea that our clients deserve the best remodeling experience. The main focus for us is finishing the work right the first time and on-time, always within budget. At GAXL General Construction we are aiming to be a company leader in the market in Northern California in which our clients can trust with 100% confidence their construction/ remodeling needs. We strive to be consistent as well as efficient in the delivery of our services, and offer our clients a one-stop source for their construction and remodeling needs. Once again, thank you!, we are looking forward to speaking with you about your next project; big or small, we are here for you! How about that new deck or gazebo? Are you ready for those family gatherings? Want to turn your backyard into your new summer/fall hang out spot? We will make sure we bring you creative solutions done perfectly right with the help of our experts. Let's talk today! -Building with Vision.

"We received quotes from 3 different contractors. We chose GAXL because it's close to Newark and I like how Jose explains everything in detail. Originally we thought the remodeling would take 4 weeks but it took close 6 weeks. The whole project was great, the craftsmanship was superb. At one point, we found some tiles that are not very nice (from the manufacturer) and we asked them to redo the bathroom wall. They don't complain and understand our request. The workers are great, especially Marvin and this other guy (forgot his name). They WORK very very hard from 8a to 6p everyday. Jose is on time and is very prompt in returning calls or text. In fact he's the only contractor who's very prompt and I like that! On one of the walls they discovered a mold due to rain leaking and they're able to fix it in 4 days which is great. Jose and his son pickup the materials from the suppliers and drop them in our house. Overall, Jose and his men are courteous. I will definitely use GAXL for future remodeling."

Johann W on February 2025

Zacarias Remodeling Construction

1320 Paso De Sauce RD

Zacarias Remodeling Construction

1320 Paso De Sauce RD

Customers say: Quick response

Recommended by 100% of Angi customers

218 local quotes requested

We are a locally owned and operated company since 2009, with lots of industry experience. We specialize in Additions and Kitchen Remodels, but also offer a wide range of expertise for a variety of other Home Improvement 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! We are a bilingual company, and are happy to serve both our English and Spanish Speaking communities! ¡Hablamos Espanol!

"Oscar truly stands out as a contractor who cares deeply about his clients, and that’s exactly how he made me feel. I reached out to five different contractors to assess my bathroom and offer ideas, but my experiences varied significantly. Some were overly sales-driven, others dismissed my ideas entirely, and one didn’t even follow up with an estimate. Oscar, however, was a breath of fresh air. He arrived on time, listened attentively to my ideas, and offered thoughtful suggestions. He was highly collaborative with the other workers on site, making sure everything was well coordinated. Oscar's expertise in the industry is evident, and he’s exceptionally creative when it comes to problem-solving. When he identified additional challenges during the project, he took the time to offer practical solutions, demonstrating his commitment to delivering the best result. Oscar has earned my trust and will be my go-to contractor for any future projects. I highly recommend him to anyone in need of a reliable, skilled, and dedicated professional"

Lisa N on March 2025

We are a locally owned and operated company since 2009, with lots of industry experience. We specialize in Additions and Kitchen Remodels, but also offer a wide range of expertise for a variety of other Home Improvement 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! We are a bilingual company, and are happy to serve both our English and Spanish Speaking communities! ¡Hablamos Espanol!

"Oscar truly stands out as a contractor who cares deeply about his clients, and that’s exactly how he made me feel. I reached out to five different contractors to assess my bathroom and offer ideas, but my experiences varied significantly. Some were overly sales-driven, others dismissed my ideas entirely, and one didn’t even follow up with an estimate. Oscar, however, was a breath of fresh air. He arrived on time, listened attentively to my ideas, and offered thoughtful suggestions. He was highly collaborative with the other workers on site, making sure everything was well coordinated. Oscar's expertise in the industry is evident, and he’s exceptionally creative when it comes to problem-solving. When he identified additional challenges during the project, he took the time to offer practical solutions, demonstrating his commitment to delivering the best result. Oscar has earned my trust and will be my go-to contractor for any future projects. I highly recommend him to anyone in need of a reliable, skilled, and dedicated professional"

Lisa N on March 2025

Tech Line Construction Inc.

6114 La Salle Avenue

New on HomeAdvisorNew on HomeAdvisor

•Approved Pro

Tech Line Construction Inc.

6114 La Salle Avenue

New on HomeAdvisorNew on HomeAdvisor

•Approved Pro

87 local quotes requested

5 years of experience

Welcome to Tech Line Construction, your trusted partner in enhancing your home and transforming your wishes into visual and solid realities. With over a decade of unwavering dedication and a commitment to excellence, we have proudly served our clients in delivering top-tier construction solutions. We specialize in providing top-notch services for residential and commercial projects. Our commitment to professionalism, quality, and meticulous attention to detail sets us apart from our competitors. Choose Tech Line Construction for your next construction project and experience the highest level of service and craftsmanship. Bay Area General B Contractor Jose Rodriguez ( General Building contractor ) (510)798-5869 Office@techlineconstruction.info Tech Line Construction inc TechLineconstructiondesign.com CSLB # LIC 1094361 Commercial liability &Worker comp. Insured & bonded

Cerletti & Kennedy Design-Build

2950 Buskirk Avenue, Suite 300

Cerletti & Kennedy Design-Build

2950 Buskirk Avenue, Suite 300

Customers say: True professional

27 local quotes requested

38 years of experience

SPECIALIZING IN HAPPY CUSTOMERS! Cerletti & Kennedy Design-Build is a full service contractor, family owned and operated for three generations. We specialize in room additions, kitchens and all your remodeling needs. We offer comprehensive design services utilizing the latest 3D CAD technology so you can see your design choices before you build. We're prompt and cost effective, our workers are clean and courteous and our customers are satisfied and happy.

"The job got finished overall I was happy with the finish project. The job was not as smooth I had hoped for. I believe my experience on construction and expectation's might have been out of touch. I would for sure let them bid on more work for me if I ever planned to do any more construction."

Larry P on April 2025

SPECIALIZING IN HAPPY CUSTOMERS! Cerletti & Kennedy Design-Build is a full service contractor, family owned and operated for three generations. We specialize in room additions, kitchens and all your remodeling needs. We offer comprehensive design services utilizing the latest 3D CAD technology so you can see your design choices before you build. We're prompt and cost effective, our workers are clean and courteous and our customers are satisfied and happy.

"The job got finished overall I was happy with the finish project. The job was not as smooth I had hoped for. I believe my experience on construction and expectation's might have been out of touch. I would for sure let them bid on more work for me if I ever planned to do any more construction."

Larry P on April 2025

ABR Quality Resources Inc

ABR Quality Resources Inc

42 local quotes requested

4 years of experience

At Hamilton Exteriors, our mission is to serve our community with the highest-value construction solutions. Specializing in roofs, windows, and siding, we bring over 50 years of combined experience to every project. Our skilled team takes pride in meticulous craftsmanship and attention to detail, ensuring every job is done right the first time.

"I scheduled to have someone come give me an estimate for all new windows in our 1950s home with not so great Remodeling work by previous owners. Alex Li promptly met with us and it was a pleasure working with him & his crew throughout the entire process. They were always on time to work, left our home clean of debris & spectacular new JeldWin windows. Helped me with getting Financing as well...Just all around a great experience & highly recommend!"

Renee D on February 2025

At Hamilton Exteriors, our mission is to serve our community with the highest-value construction solutions. Specializing in roofs, windows, and siding, we bring over 50 years of combined experience to every project. Our skilled team takes pride in meticulous craftsmanship and attention to detail, ensuring every job is done right the first time.

"I scheduled to have someone come give me an estimate for all new windows in our 1950s home with not so great Remodeling work by previous owners. Alex Li promptly met with us and it was a pleasure working with him & his crew throughout the entire process. They were always on time to work, left our home clean of debris & spectacular new JeldWin windows. Helped me with getting Financing as well...Just all around a great experience & highly recommend!"

Renee D on February 2025

Red Line Remodeling & Design, LLC

Red Line Remodeling & Design, LLC

Customers say: Quality work

Recommended by 100% of Angi customers

15 local quotes requested

Red Line Remodeling & Design, LLC is the premier home improvement and remodeling company centrally located in Rio Vista serving Solano County, Sacramento County, San Joaquin, and Contra Costa County in California. We have over 20 years experience, family owned and operated. Our #1 goal as a company is having complete customer satisfaction and there is no job that is too big or too small. We specialize in a variety of projects Specializing in custom kitchen and bathroom remodeling, open concept and room additions. If you want the job done right, call us today for a free estimate.

"Extremely satisfied. I hired them for my kitchen remodel and then again for our bathroom remodel! High quality work! Friendly and easy to work with!! Will be using them again for our next project!"

Teresa U on April 2022

Red Line Remodeling & Design, LLC is the premier home improvement and remodeling company centrally located in Rio Vista serving Solano County, Sacramento County, San Joaquin, and Contra Costa County in California. We have over 20 years experience, family owned and operated. Our #1 goal as a company is having complete customer satisfaction and there is no job that is too big or too small. We specialize in a variety of projects Specializing in custom kitchen and bathroom remodeling, open concept and room additions. If you want the job done right, call us today for a free estimate.

"Extremely satisfied. I hired them for my kitchen remodel and then again for our bathroom remodel! High quality work! Friendly and easy to work with!! Will be using them again for our next project!"

Teresa U on April 2022

BE HOME REMODELING INC

BE HOME REMODELING INC

Customers say: Quick response

587 local quotes requested

1 years of experience

Be Home Remodeling is a home improvement company dedicated to transforming spaces with quality craftsmanship and personalized service. We specialize in a range of remodeling projects, from kitchens and bathrooms to full home renovations, back yard remodeling and more. Our team of experienced professionals collaborates closely with clients to understand their vision and bring it to life, ensuring each project reflects their style and meets their needs. Whether you're looking to update a single room or undertake a complete overhaul, Be Home Remodeling is here to make your dream home a reality.

"My journey began when I met Mario from Be Home Remodeling. I started with just one bathroom remodel, and I was immediately impressed by the professionalism, attention to detail, and high-quality craftsmanship he and his team delivered. The communication throughout the project was clear and consistent, and they made sure every step met my expectations. Since then, I?ve trusted Be Home Remodeling with additional projects and have always been more than satisfied with the results. Highly recommend Mario and his team to anyone looking for reliable and high-quality construction work"

nate b on July 2025

Be Home Remodeling is a home improvement company dedicated to transforming spaces with quality craftsmanship and personalized service. We specialize in a range of remodeling projects, from kitchens and bathrooms to full home renovations, back yard remodeling and more. Our team of experienced professionals collaborates closely with clients to understand their vision and bring it to life, ensuring each project reflects their style and meets their needs. Whether you're looking to update a single room or undertake a complete overhaul, Be Home Remodeling is here to make your dream home a reality.

"My journey began when I met Mario from Be Home Remodeling. I started with just one bathroom remodel, and I was immediately impressed by the professionalism, attention to detail, and high-quality craftsmanship he and his team delivered. The communication throughout the project was clear and consistent, and they made sure every step met my expectations. Since then, I?ve trusted Be Home Remodeling with additional projects and have always been more than satisfied with the results. Highly recommend Mario and his team to anyone looking for reliable and high-quality construction work"

nate b on July 2025

JMIG Construction

7720 Zilli Dr, Tracy California 95304

JMIG Construction

7720 Zilli Dr, Tracy California 95304

Customers say: Quick response

Recommended by 100% of Angi customers

101 local quotes requested

JMIG Construction brings over 20 years of expertise to the forefront, specializing in exquisite kitchen and bathroom renovations. With a steadfast commitment to quality, innovation, and client satisfaction, JMIG Construction has established itself as a premier choice for homeowners seeking to transform their living spaces into luxurious and functional retreats. At JMIG Construction, we recognize that the kitchen and bathroom are the heart of any home, where functionality meets aesthetics. With our wealth of experience and dedication to excellence, we strive to create captivating spaces that not only meet but exceed our clients' expectations. Our services encompass every aspect of kitchen and bathroom renovations! Call or click for your FREE estimate today!

"Fantastic work!"

Fred T on January 2025

JMIG Construction brings over 20 years of expertise to the forefront, specializing in exquisite kitchen and bathroom renovations. With a steadfast commitment to quality, innovation, and client satisfaction, JMIG Construction has established itself as a premier choice for homeowners seeking to transform their living spaces into luxurious and functional retreats. At JMIG Construction, we recognize that the kitchen and bathroom are the heart of any home, where functionality meets aesthetics. With our wealth of experience and dedication to excellence, we strive to create captivating spaces that not only meet but exceed our clients' expectations. Our services encompass every aspect of kitchen and bathroom renovations! Call or click for your FREE estimate today!

"Fantastic work!"

Fred T on January 2025

Tech Line Construction, Inc.

6114 La Salle Ave, Unit 296

Tech Line Construction, Inc.

6114 La Salle Ave, Unit 296

Customers say: Quick response

Recommended by 100% of Angi customers

20 local quotes requested

At Tech Line Construction, we take immense pride in our long built reputation for building stunning, efficient home improvement projects that mirror the unique style and elegance of the people who live in them. Tech Line Construction has a standing passion for the intricacies and artistry involved with residential home improvement . With team members over 15 years in the industry and a wealth of experience, Tech Line Construction is the premier choice for those looking to craft their dreams into a reality. Our focus is every little detail and we take great pride in setting the bar for the highest standards in quality craftsmanship and proactive problem-solving. Don't hesitate to contact us today for a free consultation TECHLINECONSTRUCTIONDESIGN.COM Office@techlinconstruction.info (510)798-5869

"We had a great experience working with Tech Line Construction. They did a complete remodel of our kitchen, bathroom, and flooring. The whole process was very smooth and we are extremely happy with the results. Cooking in our new kitchen is a joy and we can't wait to entertain guests in our beautiful space."

Patricia M D on November 2022

At Tech Line Construction, we take immense pride in our long built reputation for building stunning, efficient home improvement projects that mirror the unique style and elegance of the people who live in them. Tech Line Construction has a standing passion for the intricacies and artistry involved with residential home improvement . With team members over 15 years in the industry and a wealth of experience, Tech Line Construction is the premier choice for those looking to craft their dreams into a reality. Our focus is every little detail and we take great pride in setting the bar for the highest standards in quality craftsmanship and proactive problem-solving. Don't hesitate to contact us today for a free consultation TECHLINECONSTRUCTIONDESIGN.COM Office@techlinconstruction.info (510)798-5869

"We had a great experience working with Tech Line Construction. They did a complete remodel of our kitchen, bathroom, and flooring. The whole process was very smooth and we are extremely happy with the results. Cooking in our new kitchen is a joy and we can't wait to entertain guests in our beautiful space."

Patricia M D on November 2022

Get matched with top addition to existing structure builders in Brentwood, CA

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Hon's Construction, Inc.

Hon's Construction, Inc.

GAXL GENERAL CONSTRUCTION

GAXL GENERAL CONSTRUCTION

Zacarias Remodeling Construction

Zacarias Remodeling Construction

Tech Line Construction Inc.

Tech Line Construction Inc.

Cerletti & Kennedy Design-Build

Cerletti & Kennedy Design-Build

ABR Quality Resources Inc

ABR Quality Resources Inc

Red Line Remodeling & Design, LLC

Red Line Remodeling & Design, LLC

BE HOME REMODELING INC

BE HOME REMODELING INC

JMIG Construction

JMIG Construction

Tech Line Construction, Inc.

Tech Line Construction, Inc.

The Brentwood, CA homeowners’ guide to addition to existing structure building services

How Much Does a Bus Conversion Cost in 2025?

DIY Kitchen Remodel

Build a Dining Room

Build a Secret Room

Build an A-Frame House

Build a Bar

Get our Angi-powered app

Get matched with top addition to existing structure builders in Brentwood, CA

Enter your zip and get matched with up to 3 pros

Matching on HomeAdvisor

Find Addition to existing structure builders in Brentwood

Hon's Construction, Inc.

Hon's Construction, Inc.

GAXL GENERAL CONSTRUCTION

GAXL GENERAL CONSTRUCTION

Zacarias Remodeling Construction

Zacarias Remodeling Construction

Tech Line Construction Inc.

Tech Line Construction Inc.

Cerletti & Kennedy Design-Build

Cerletti & Kennedy Design-Build

ABR Quality Resources Inc

ABR Quality Resources Inc

Red Line Remodeling & Design, LLC

Red Line Remodeling & Design, LLC

BE HOME REMODELING INC

BE HOME REMODELING INC

JMIG Construction

JMIG Construction

Tech Line Construction, Inc.

Tech Line Construction, Inc.

The Brentwood, CA homeowners’ guide to addition to existing structure building services

How Much Does a Bus Conversion Cost in 2025?

DIY Kitchen Remodel

Build a Dining Room

Build a Secret Room

Build an A-Frame House

Build a Bar

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