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Find Addition to existing structure builders in Rockville

Avatar for Elevate Design Build, LLC

Elevate Design Build, LLC

4.80(
25
)
•Approved Pro

Elevate Design Build, LLC

4.80(
25
)
•Approved Pro
Customers say: Quality work
Recommended by 96% of Angi customers
Recommended by 96% of HomeAdvisor customers
32 local quotes requested

We pride our company on reliability, great communication, integrity, and quality work. We strongly believe in giving our absolute best in all of our projects no matter how big or small. We are experts in our trade and will always keep you educated on your particular task or project. We look forward to earning your business!

"All the people at Elevate Design and Build were amazing and a pleasure to work with. We doubled the size of our house including tripling the size of the kitchen, knocking out walls to create an open floor plan and added a three car garage with home office over the garage. They even recommended modifications to our original blueprints which were excellent. All their workers friendly and did a first class job. Went totally above and beyond our expectations. One year later we have not had one single problem with any of the work. Total integrity. If any issue came up, the company absorbed the cost - not the customer. Everything they did was done perfectly. We didn't have a single issue or complaint during the entire process. I give them my highest personal recommendation. I would never use anyone else."

Stephen M on August 2024

We pride our company on reliability, great communication, integrity, and quality work. We strongly believe in giving our absolute best in all of our projects no matter how big or small. We are experts in our trade and will always keep you educated on your particular task or project. We look forward to earning your business!

"All the people at Elevate Design and Build were amazing and a pleasure to work with. We doubled the size of our house including tripling the size of the kitchen, knocking out walls to create an open floor plan and added a three car garage with home office over the garage. They even recommended modifications to our original blueprints which were excellent. All their workers friendly and did a first class job. Went totally above and beyond our expectations. One year later we have not had one single problem with any of the work. Total integrity. If any issue came up, the company absorbed the cost - not the customer. Everything they did was done perfectly. We didn't have a single issue or complaint during the entire process. I give them my highest personal recommendation. I would never use anyone else."

Stephen M on August 2024

Avatar for NC Repair and Remodeling

NC Repair and Remodeling

5.00(
2
)
•Approved Pro

NC Repair and Remodeling

5.00(
2
)
•Approved Pro
Customers say: Quick response
4 years of experience
Free onsite estimate

NC Repair and Remodeling is your trusted partner in transforming spaces. With our expertise spanning from residential repairs and renovations to commercial build-outs and service contracts. We're here to make your dreams a reality. Let us help you create the home or business you've always envisioned, where comfort, design and functionality intertwine. Together, let's make your space truly exceptional and tailored to your unique needs.

"NC Repair were amazing!!! Their attention to detail is the best. The team was very clean and courteous. They made the experience very easy. We love the outcome of the remodeling.Definitely calling them again."

Oscar J on October 2021

NC Repair and Remodeling is your trusted partner in transforming spaces. With our expertise spanning from residential repairs and renovations to commercial build-outs and service contracts. We're here to make your dreams a reality. Let us help you create the home or business you've always envisioned, where comfort, design and functionality intertwine. Together, let's make your space truly exceptional and tailored to your unique needs.

"NC Repair were amazing!!! Their attention to detail is the best. The team was very clean and courteous. They made the experience very easy. We love the outcome of the remodeling.Definitely calling them again."

Oscar J on October 2021

Avatar for GaaJ

GaaJ

5.00(
2
)
•Approved Pro

GaaJ

5.00(
2
)
•Approved Pro
Customers say: Quick response
19 years of experience
Free onsite estimate

We're a locally owned and operated company that values honesty and integrity and treats your home as if it were our own. We offer a variety of General Contractor Home Improvement services that are customizable to each individual project. We specialize in Additions and Kitchen Remodels, but also offer a wide range of expertise for a variety of other 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!

"GAAJ’s team were truly professionals. They listened to our needs and made my grandmother’s vision of a room, a reality. They were passionate and went above and beyond with details on the construction. If you have any building needs, I highly recommend GAAJ!"

Stephanie K on August 2025

We're a locally owned and operated company that values honesty and integrity and treats your home as if it were our own. We offer a variety of General Contractor Home Improvement services that are customizable to each individual project. We specialize in Additions and Kitchen Remodels, but also offer a wide range of expertise for a variety of other 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!

"GAAJ’s team were truly professionals. They listened to our needs and made my grandmother’s vision of a room, a reality. They were passionate and went above and beyond with details on the construction. If you have any building needs, I highly recommend GAAJ!"

Stephanie K on August 2025

Krause Design & Construction, Inc.

4.94(
3
)
•Approved Pro

Krause Design & Construction, Inc.

4.94(
3
)
•Approved Pro
Customers say: Quick response
Recommended by 100% of Angi customers
Recommended by 100% of HomeAdvisor customers
40 years of experience

Krause Design & Construction, Inc. is one of the area's elite high-end home improvement experts, currently specializing in an array of expertise for all of your addition needs. We are a family owned and operated business with decades worth of experience in the industry and are considered by many to be masters within our field. We can either provide the concept for your project, or breathe life into your own vision, thereby creating a true marveled work of beauty. Regardless of the size and scope of your project, we will employ our unique skill set to see your project through fruition. We will treat your property with the same personal degree of care and consideration that we utilize when working on our own properties. We have satisfied repeat customers that routinely call us for new projects. We are always looking for new clients. Feel free to contact us to schedule an initial consultation, we are more than happy to meet with you and discuss your project today!

"You will not be disappointed by Krause Design & Construction. This is a phenomenal company run by an honest, talented, skilled and experienced businessman. No horror stories, no regrets. Krause built what we asked for and stayed on budget and on schedule. Just hire Krause and you will not be disappointed!"

Vince B on May 2016

Krause Design & Construction, Inc. is one of the area's elite high-end home improvement experts, currently specializing in an array of expertise for all of your addition needs. We are a family owned and operated business with decades worth of experience in the industry and are considered by many to be masters within our field. We can either provide the concept for your project, or breathe life into your own vision, thereby creating a true marveled work of beauty. Regardless of the size and scope of your project, we will employ our unique skill set to see your project through fruition. We will treat your property with the same personal degree of care and consideration that we utilize when working on our own properties. We have satisfied repeat customers that routinely call us for new projects. We are always looking for new clients. Feel free to contact us to schedule an initial consultation, we are more than happy to meet with you and discuss your project today!

"You will not be disappointed by Krause Design & Construction. This is a phenomenal company run by an honest, talented, skilled and experienced businessman. No horror stories, no regrets. Krause built what we asked for and stayed on budget and on schedule. Just hire Krause and you will not be disappointed!"

Vince B on May 2016

Avatar for Masonry Stonework

Masonry Stonework

5.00(
3
)
•Approved Pro

Masonry Stonework

5.00(
3
)
•Approved Pro
Customers say: Quick response
Recommended by 100% of Angi customers
Recommended by 100% of HomeAdvisor customers
12 years of experience

We are a locally owned and operated company with over 22 years of industry experience. We value honesty and integrity in all aspects of our business. We offer a variety of Home Improvement services that are customizable to each individual project. We specialize in handyman/carpentry work and a variety of related service and repair 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 with our clients and guarantee your satisfaction!

"Great service and good work!"

Franklin F on February 2023

We are a locally owned and operated company with over 22 years of industry experience. We value honesty and integrity in all aspects of our business. We offer a variety of Home Improvement services that are customizable to each individual project. We specialize in handyman/carpentry work and a variety of related service and repair 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 with our clients and guarantee your satisfaction!

"Great service and good work!"

Franklin F on February 2023

Avatar for Willis Builders Inc

Willis Builders Inc

4.64(
321
)
•Approved Pro

Willis Builders Inc

4.64(
321
)
•Approved Pro
Customers say: Super punctual
131 local quotes requested
21 years of experience

General contractor servicing Montgomery County and parts of Washington DC. Willis Builders is a family owned and operated company, that specializes in additions, kitchen, bathroom and basement remodeling. Our team is skilled in all aspects of residential construction. Willis Builders has built a business on honesty, dedication and hard work. Our goal is to make your renovation dream come true! Contact us today to schedule a free estimate.

"Excellent work. Very happy with the results."

Jon A on May 2025

General contractor servicing Montgomery County and parts of Washington DC. Willis Builders is a family owned and operated company, that specializes in additions, kitchen, bathroom and basement remodeling. Our team is skilled in all aspects of residential construction. Willis Builders has built a business on honesty, dedication and hard work. Our goal is to make your renovation dream come true! Contact us today to schedule a free estimate.

"Excellent work. Very happy with the results."

Jon A on May 2025

Avatar for DSA Remodeling

DSA Remodeling

5.00(
3
)
•Approved Pro

DSA Remodeling

5.00(
3
)
•Approved Pro
Super Service Award
Customers say: Quick response
Recommended by 100% of Angi customers
Recommended by 100% of HomeAdvisor customers
25 local quotes requested

DSA Remodeling is a commercial and Residential improvement & remodeling company which provides professional construction services for any type of improvement, addition, or renovation project. Our full service approach includes design services with home remodeling ideas that transform your dreams into working plans.

"Work went really well. They performed an exceptional work. Since the beginning of our business meets, they provided me with a clear ideas, proposal that would adjusted to my budget. Work was done in time, and all the staff members of the company were very responsible and respectful . I am very happy and satisfied with the outcome of the project. My kitchen looks great and is very functional. I will recommend the service of this company to my friends and family."

Zoila N on September 2024

DSA Remodeling is a commercial and Residential improvement & remodeling company which provides professional construction services for any type of improvement, addition, or renovation project. Our full service approach includes design services with home remodeling ideas that transform your dreams into working plans.

"Work went really well. They performed an exceptional work. Since the beginning of our business meets, they provided me with a clear ideas, proposal that would adjusted to my budget. Work was done in time, and all the staff members of the company were very responsible and respectful . I am very happy and satisfied with the outcome of the project. My kitchen looks great and is very functional. I will recommend the service of this company to my friends and family."

Zoila N on September 2024

Avatar for Paradise Construction & Remodeling

Paradise Construction & Remodeling

4.77(
30
)
•Approved Pro

Paradise Construction & Remodeling

4.77(
30
)
•Approved Pro
Customers say: Super punctual
Recommended by 90% of Angi customers
Recommended by 90% of HomeAdvisor customers
11 local quotes requested

Established in 2017. We are a family owned and operated full service general contracting company servicing the entire Montgomery County area. We bring generations of experience to the table. Handling any project, large or small and provide you with the best quality work at an affordable price. We will help you with any project every step of the way. Whether it's your dream home or a simple remodel, we will be available to you with any questions or changes that you may have along the way. We accept all insurance claims and we are available 24/7 for all emergencies. We do it all! Call us for a consultation. No job is too big.

"We hired Paradise Home Improvement to build our second story addition. John the owner handled everything! It was the perfect amount of attention to our project. We’re so glad we made the right choice hiring Paradise Home Improvement."

angelo n on April 2025

Established in 2017. We are a family owned and operated full service general contracting company servicing the entire Montgomery County area. We bring generations of experience to the table. Handling any project, large or small and provide you with the best quality work at an affordable price. We will help you with any project every step of the way. Whether it's your dream home or a simple remodel, we will be available to you with any questions or changes that you may have along the way. We accept all insurance claims and we are available 24/7 for all emergencies. We do it all! Call us for a consultation. No job is too big.

"We hired Paradise Home Improvement to build our second story addition. John the owner handled everything! It was the perfect amount of attention to our project. We’re so glad we made the right choice hiring Paradise Home Improvement."

angelo n on April 2025

Avatar for New Line Remodeling LLC

New Line Remodeling LLC

5.00(
12
)
•Approved Pro

New Line Remodeling LLC

5.00(
12
)
•Approved Pro
Customers say: Quick response
Recommended by 100% of Angi customers
Recommended by 100% of HomeAdvisor customers
23 local quotes requested

We are not just a remodeling or Home Improvement company. We focus on keeping our clients satisfied and happy. quality is our priority.

"Carlos and his crew do great work. They are clean and efficient. I have used them a few times and would use them again."

Vikki D on July 2023

We are not just a remodeling or Home Improvement company. We focus on keeping our clients satisfied and happy. quality is our priority.

"Carlos and his crew do great work. They are clean and efficient. I have used them a few times and would use them again."

Vikki D on July 2023

Simmons Home Improvement LLC

4.93(
84
)
•Approved Pro

Simmons Home Improvement LLC

4.93(
84
)
•Approved Pro
Super Service Award
Customers say: Quick response
Recommended by 97% of Angi customers
Recommended by 97% of HomeAdvisor customers
40 local quotes requested

From start to finish, we have you covered from home repairs, to remodeling! TV wall/ceiling mounts, furniture assembly, toilet installs, flooring, drywall, painting and more! We guarantee your satisfaction and we won’t leave until the job is done right. We pride ourselves on the quality work we provide, while delivering great customer service! Check out all the services we offer below and call -- or-- click to schedule a free estimate today!

"Excellent customer service and assisted with design of the projects."

Terri H on November 2025

From start to finish, we have you covered from home repairs, to remodeling! TV wall/ceiling mounts, furniture assembly, toilet installs, flooring, drywall, painting and more! We guarantee your satisfaction and we won’t leave until the job is done right. We pride ourselves on the quality work we provide, while delivering great customer service! Check out all the services we offer below and call -- or-- click to schedule a free estimate today!

"Excellent customer service and assisted with design of the projects."

Terri H on November 2025

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FAQs for addition to existing structure building service projects in Rockville, MD

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.

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.

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.

The Rockville, MD 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.

See all articles