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Addition and remodeling pros in Castro Valley

Alrob Building Services
1110 West Mariposa Avenue
5.00(
1
)
Approved Pro
Alrob Building Services
1110 West Mariposa Avenue
5.00(
1
)
Approved Pro
Customers say: Quick response
Recommended by 100% of Angi customers
Recommended by 100% of HomeAdvisor customers
15 years of experience

Alrob Building Services, 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.

"Absolutely phenomenal service. My first Angie’s Handyman and Danny set the bar very high. Ran into some hiccups due to weird nonstandard preexisting setups and he took everything he encountered on the chin. Danny explained everything he did at every step and proposed creative solutions."

Yanick M on January 2023

Alrob Building Services, 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.

"Absolutely phenomenal service. My first Angie’s Handyman and Danny set the bar very high. Ran into some hiccups due to weird nonstandard preexisting setups and he took everything he encountered on the chin. Danny explained everything he did at every step and proposed creative solutions."

Yanick M on January 2023


Avatar for Blackstone Construction Services, Inc.
Blackstone Construction Services, Inc.
385 Hartz Ave
4.00(
1
)
Approved Pro
Blackstone Construction Services, Inc.
385 Hartz Ave
4.00(
1
)
Approved Pro
Customers say: Quick response
Recommended by 100% of Angi customers
Recommended by 100% of HomeAdvisor customers
9 years of experience

BCS has over 25 years' experience in the construction industry. The sophistication and attention to detail that was born from our experience with high level custom homes has been foundational to our success with multi-family, commercial and post-litigation repair work. We bring cost effective, creative and knowledgeable solutions to our role as a member of your project team. We would love to talk with your about your project and how we can be a solution for you.

"Thomas is very forthright and honest."

Bill A on December 2020

BCS has over 25 years' experience in the construction industry. The sophistication and attention to detail that was born from our experience with high level custom homes has been foundational to our success with multi-family, commercial and post-litigation repair work. We bring cost effective, creative and knowledgeable solutions to our role as a member of your project team. We would love to talk with your about your project and how we can be a solution for you.

"Thomas is very forthright and honest."

Bill A on December 2020


AM GENERAL CONTRACTOR
2341 W Ave #133
5.00(
2
)
Approved Pro
AM GENERAL CONTRACTOR
2341 W Ave #133
5.00(
2
)
Approved Pro
Customers say: Quick response
Recommended by 100% of Angi customers
Recommended by 100% of HomeAdvisor customers
22 years of experience

We take great pride in our experience, expertise, quality and customer service that we provide to meet every consumer's needs. It is our mission to provide excellent customer service from start to completion of a project. To understand the needs and expectations of our customers, we take great care to work and communicate with every customer in a personal and professional manner. Our reputation is based on service, safety and quality, regardless of how large or small the job.

"What ever he plans for the project,He compleat that.He is honest and fair.I will refer him to my friends and family."

Mina R on November 2020

We take great pride in our experience, expertise, quality and customer service that we provide to meet every consumer's needs. It is our mission to provide excellent customer service from start to completion of a project. To understand the needs and expectations of our customers, we take great care to work and communicate with every customer in a personal and professional manner. Our reputation is based on service, safety and quality, regardless of how large or small the job.

"What ever he plans for the project,He compleat that.He is honest and fair.I will refer him to my friends and family."

Mina R on November 2020


Avatar for Springs Construction Corporation
Springs Construction Corporation
881 Hurlingame Ave
New on HomeAdvisorNew on Angi
Approved Pro
Springs Construction Corporation
881 Hurlingame Ave
New on AngiNew on HomeAdvisor
Approved Pro
66 years of experience
Free onsite estimate

Since 1959, Springs Construction has built its reputation on fine craftsmanship, technical expertise and solid project management.We take a proactive, client driven approach to every one of our projects, exceeding our customers vision for their homes. We want you to feel comfortable and safe during the disruption and enjoy your home for years to come.

Since 1959, Springs Construction has built its reputation on fine craftsmanship, technical expertise and solid project management.We take a proactive, client driven approach to every one of our projects, exceeding our customers vision for their homes. We want you to feel comfortable and safe during the disruption and enjoy your home for years to come.


Bro Builders Renovations
2021 84th Ave Oakland
New on HomeAdvisorNew on Angi
Approved Pro
Bro Builders Renovations
2021 84th Ave Oakland
New on AngiNew on HomeAdvisor
Approved Pro
4 years of experience
Free onsite estimate

Welcome to Bro Builders Renovations! We take pride in the quality of work and customer satisfaction that we give each and every customer! We are known to pay exquisite attention to detail while making customer satisfaction our top priority. Call us today to learn more about how we can help you!

Welcome to Bro Builders Renovations! We take pride in the quality of work and customer satisfaction that we give each and every customer! We are known to pay exquisite attention to detail while making customer satisfaction our top priority. Call us today to learn more about how we can help you!


Cerletti & Kennedy Design-Build
2950 Buskirk Avenue, Suite 300
4.60(
82
)
Approved Pro
Cerletti & Kennedy Design-Build
2950 Buskirk Avenue, Suite 300
4.60(
82
)
Approved Pro
Super Service Award
Customers say: True professional
46 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


Avatar for Griggs Construction
Griggs Construction
6118 Market St
4.88(
4
)
Approved Pro
Griggs Construction
6118 Market St
4.88(
4
)
Approved Pro
Customers say: Quality work
Recommended by 100% of Angi customers
Recommended by 100% of HomeAdvisor customers
7 years of experience

Top quality work and your satisfaction are our priorities. We understand that your home is your castle, and pride ourselves in delivering the results you want reliably and with integrity. As experts in our trade, we know the importance of keeping you informed at every stage of your project, in a timely and always honest manner. Give us a call today and let’s talk about how we can make your dreams a reality! We look forward to earning your business!

"Good, but may be slow to respond on followup projects"

Jan K on June 2021

Top quality work and your satisfaction are our priorities. We understand that your home is your castle, and pride ourselves in delivering the results you want reliably and with integrity. As experts in our trade, we know the importance of keeping you informed at every stage of your project, in a timely and always honest manner. Give us a call today and let’s talk about how we can make your dreams a reality! We look forward to earning your business!

"Good, but may be slow to respond on followup projects"

Jan K on June 2021


Avatar for Cal Green Remodeling
Cal Green Remodeling
1400 Coleman Ave Unit F14-2
5.00(
33
)
Approved Pro
Cal Green Remodeling
1400 Coleman Ave Unit F14-2
5.00(
33
)
Approved Pro
Customers say: Quick response
Recommended by 90% of Angi customers
Recommended by 90% of HomeAdvisor customers
217 local quotes requested

Home Remodeling and Commercial Renovation. From custom kitchens to concrete floors we do it all and our experienced professionals can help you figure out what products are right for you. We offer industrial grade finishes that can handle excessive traffic, as well as fine finishes for your home.

"After months of planning, we chose Aly to remodel our kitchen and living room and we're so glad we did. From the initial consultation to the final walk-through, the process was seamless. The team was respectful of our home and incredibly friendly. We absolutely love our new space and highly recommend Aly and his team at Cal Green Remodeling."

Albert A on June 2025

Home Remodeling and Commercial Renovation. From custom kitchens to concrete floors we do it all and our experienced professionals can help you figure out what products are right for you. We offer industrial grade finishes that can handle excessive traffic, as well as fine finishes for your home.

"After months of planning, we chose Aly to remodel our kitchen and living room and we're so glad we did. From the initial consultation to the final walk-through, the process was seamless. The team was respectful of our home and incredibly friendly. We absolutely love our new space and highly recommend Aly and his team at Cal Green Remodeling."

Albert A on June 2025


Christiansen Construction
375 Elizabeth Court
4.88(
8
)
Approved Pro
Christiansen Construction
375 Elizabeth Court
4.88(
8
)
Approved Pro
Customers say: Quick response
Recommended by 100% of Angi customers
Recommended by 100% of HomeAdvisor customers
10 local quotes requested

We have a single mission: complete customer satisfaction! With over 40 years of experience, serving the Bay Area, we strongly believe in giving our customers the most for their money. We work with only the highest quality materials and we are professional craftsmen. We have consistently focused on the needs of our customers, providing personalized attention and a stress-free experience. Please give us a call today for a free estimate.

"I was exceptionally happy with work that was done and his professionalism. I highly recommend !"

Glen A on April 2021

We have a single mission: complete customer satisfaction! With over 40 years of experience, serving the Bay Area, we strongly believe in giving our customers the most for their money. We work with only the highest quality materials and we are professional craftsmen. We have consistently focused on the needs of our customers, providing personalized attention and a stress-free experience. Please give us a call today for a free estimate.

"I was exceptionally happy with work that was done and his professionalism. I highly recommend !"

Glen A on April 2021


Avatar for Bear Remodeling, Inc.
Bear Remodeling, Inc.
2678 North Main Street, Unit 28
4.91(
16
)
Approved Pro
Bear Remodeling, Inc.
2678 North Main Street, Unit 28
4.91(
16
)
Approved Pro
Customers say: Quality work
43 local quotes requested
6 years of experience

**Due to our current installation schedule we have a project minimum* depending on the job size- ask for details as it varies depending on project size- starting at 5K*- 10k depending on job size* * Unfortunately, at this time we do not have a bilingual representative. (no spanish speaker) BEAR Remodeling, Inc. is a family-owned business and a full-service General Contractor that specializes in residential home remodeling projects. Our services include bathroom remodeling, kitchen remodeling, room additions, garage conversions, and (non prefab) ADU'S. With full licensing, bonding, and insurance, it ensures a reliable and trustworthy experience for its clients. Our team of experienced professionals, which includes both engineers and designers, collaborate in order to deliver exceptional results, consistently exceeding client expectations and transforming homes into stunning spaces. (we do not work with modular/mobile homes or offer handyman services, Small jobs)

"Working with BEAR Remodeling on our ADU garage conversion has been a great experience! The 3D design has really helped us see the project before work began. The team has stayed organized, finished on time, and delivered exactly what we had imagined. Everything has turned out clean, modern, and built to last. We have happily recommended BEAR Remodeling to anyone looking for reliable remodeling services!"

Ryker H on May 2025

**Due to our current installation schedule we have a project minimum* depending on the job size- ask for details as it varies depending on project size- starting at 5K*- 10k depending on job size* * Unfortunately, at this time we do not have a bilingual representative. (no spanish speaker) BEAR Remodeling, Inc. is a family-owned business and a full-service General Contractor that specializes in residential home remodeling projects. Our services include bathroom remodeling, kitchen remodeling, room additions, garage conversions, and (non prefab) ADU'S. With full licensing, bonding, and insurance, it ensures a reliable and trustworthy experience for its clients. Our team of experienced professionals, which includes both engineers and designers, collaborate in order to deliver exceptional results, consistently exceeding client expectations and transforming homes into stunning spaces. (we do not work with modular/mobile homes or offer handyman services, Small jobs)

"Working with BEAR Remodeling on our ADU garage conversion has been a great experience! The 3D design has really helped us see the project before work began. The team has stayed organized, finished on time, and delivered exactly what we had imagined. Everything has turned out clean, modern, and built to last. We have happily recommended BEAR Remodeling to anyone looking for reliable remodeling services!"

Ryker H on May 2025

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Showing 1-10 of 993

FAQs for addition and remodeling projects in Castro Valley, CA

The typical timeline for completing a garage-to-ADU conversion spans approximately three to six months, encompassing planning, permitting, construction, and final inspections. Projects requiring substantial structural modifications or encountering material delivery delays may extend beyond this timeframe. Working with an experienced general contractor who efficiently coordinates various trades and maintains consistent progress can significantly improve project efficiency and reduce unnecessary delays.

Converting a garage into an ADU typically requires obtaining building permits and potentially specialized electrical, plumbing, and mechanical approvals. Requirements vary significantly between jurisdictions, making consultation with local planning departments essential. Most municipalities mandate specific features, including dedicated entrances, proper emergency egress windows, and verification that the structure meets current residential safety standards. Proceeding without proper authorization risks potential penalties and complications during future property transactions.

California has implemented some of the nation's most supportive ADU regulations to address housing availability challenges. Recent legislation has streamlined approval processes, and local jurisdictions generally must approve projects meeting state guidelines. Nevertheless, individual municipalities may impose additional specific requirements regarding design, parking, or utility connections. Consulting with your local planning department remains essential for understanding the particular regulations applicable to your property.

Converting a garage to an ADU typically increases your property's assessed value, resulting in higher property tax obligations. The specific tax implications depend on your local assessment methods and how substantially the improvements enhance your property's value. While this represents an additional ongoing expense, many property owners find that potential rental income or increased property marketability offsets these higher tax obligations over time.

To qualify as a legal ADU, your converted garage must typically include a separate entrance, functional kitchen facilities, a complete bathroom, adequate natural light, proper ventilation systems, and full compliance with local building codes. Emergency egress provisions and appropriate climate control systems are also generally required. Many jurisdictions establish minimum and maximum size parameters, making consultation with your local building department essential for ensuring your conversion meets all legal requirements.

For many property owners, the potential rental income from a converted garage ADU makes the investment financially worthwhile. Monthly rental payments can help offset mortgage obligations or fund additional property improvements. The actual profitability depends on various factors, including local rental demand, the quality and size of your converted space, and your ability to maintain consistent occupancy. With careful planning and quality execution, many homeowners recover a substantial portion of their investment through ongoing rental revenue.

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