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Find Addition to existing structure builders in Washington DC

R & A Contractors Group Inc.

7826 Eastern Avenue Northwest, Suite 515
5.00(
3
)
Approved Pro

R & A Contractors Group Inc.

7826 Eastern Avenue Northwest, Suite 515
5.00(
3
)
Approved Pro
Customers say: Quick response
Recommended by 100% of Angi customers
Recommended by 100% of HomeAdvisor customers
20 years of experience

R & A Contractors Group 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 customer's interests, and make their concerns the basis of our business.

"R&A Contractors Group, Inc., is a great company to work with. They are on time, efficient, and upfront with pricing."

Daren D on November 2022

R & A Contractors Group 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 customer's interests, and make their concerns the basis of our business.

"R&A Contractors Group, Inc., is a great company to work with. They are on time, efficient, and upfront with pricing."

Daren D on November 2022


Avatar for Washingtonian Companies

Washingtonian Companies

8645 Ziggy Lane
5.00(
5
)
Approved Pro

Washingtonian Companies

8645 Ziggy Lane
5.00(
5
)
Approved Pro
Super Service Award
220 local quotes requested
7 years of experience

Transform your space with Washingtonian Companies, your interior/exterior design-build team. Whether it's roofing, windows, siding, decks, kitchens, bathrooms, or additions, we are your trusted partner to bring your vision to life and help personalize your surroundings.

"We were 100% satisfied with Washingtonian and with their work building our addition and deck. Not only was the workmanship and quality of the construction outstanding, but they operated with honesty and integrity. Their goal was our satisfaction and building a quality addition and deck. They accomplished all three and were reliable, dependable and conscientious. At no time did we believe that they had over-committed or were unable to deliver on what they had promised. They never cut corners to rush to another job nor did I ever feel that they were not spending the necessary time to ensure that the work on our job was thorough and complete. Travis, Kris and their crew were 100% professional, communicative and transparent. We will be using Washingtonian again, without hesitation. Our experience was excellent and they did an awesome job."

Walter J on January 2024

Transform your space with Washingtonian Companies, your interior/exterior design-build team. Whether it's roofing, windows, siding, decks, kitchens, bathrooms, or additions, we are your trusted partner to bring your vision to life and help personalize your surroundings.

"We were 100% satisfied with Washingtonian and with their work building our addition and deck. Not only was the workmanship and quality of the construction outstanding, but they operated with honesty and integrity. Their goal was our satisfaction and building a quality addition and deck. They accomplished all three and were reliable, dependable and conscientious. At no time did we believe that they had over-committed or were unable to deliver on what they had promised. They never cut corners to rush to another job nor did I ever feel that they were not spending the necessary time to ensure that the work on our job was thorough and complete. Travis, Kris and their crew were 100% professional, communicative and transparent. We will be using Washingtonian again, without hesitation. Our experience was excellent and they did an awesome job."

Walter J on January 2024


Avatar for Solid Foundation Construction LLC

Solid Foundation Construction LLC

5.00(
3
)
Approved Pro

Solid Foundation Construction LLC

5.00(
3
)
Approved Pro
94 local quotes requested
31 years of experience

Solid Foundation Construction is dedicated to providing our customers with the best quality and craftsmanship. We are here to build relationships with our customers and communities and to provide our employees with a great place to work. We look forward to working with you.

"Great customer service. Transparency and time management was the key, and he delivered it. He advised me on using quality products which I appreciate. Will definitely recommend "

Ham A on February 2025

Solid Foundation Construction is dedicated to providing our customers with the best quality and craftsmanship. We are here to build relationships with our customers and communities and to provide our employees with a great place to work. We look forward to working with you.

"Great customer service. Transparency and time management was the key, and he delivered it. He advised me on using quality products which I appreciate. Will definitely recommend "

Ham A on February 2025


Avatar for Omar's General Contracting

Omar's General Contracting

3705 Plyers Mill Rd
4.13(
186
)
Approved Pro

Omar's General Contracting

3705 Plyers Mill Rd
4.13(
186
)
Approved Pro
Customers say: Quality work
162 local quotes requested
37 years of experience

Family own business with 25 + years of experience, our goal is 100% customer satisfaction. Is a trusted company for the best remodeling and handyman services for home. Open since 1988, we have been providing quality general contractor work at affordable prices. Our company is led by experienced professional experienced. We have earned a reputation for being efficient craftsmen who are knowledgeable in all areas of construction and renovations.

"They were responsive and professional. I'm happy with the result."

Sesi A on September 2025

Family own business with 25 + years of experience, our goal is 100% customer satisfaction. Is a trusted company for the best remodeling and handyman services for home. Open since 1988, we have been providing quality general contractor work at affordable prices. Our company is led by experienced professional experienced. We have earned a reputation for being efficient craftsmen who are knowledgeable in all areas of construction and renovations.

"They were responsive and professional. I'm happy with the result."

Sesi A on September 2025


Avatar for UrbanLab

UrbanLab

4.83(
6
)
Approved Pro

UrbanLab

4.83(
6
)
Approved Pro
Super Service Award
Customers say: Quick response
Recommended by 100% of Angi customers
Recommended by 100% of HomeAdvisor customers
22 local quotes requested

Visit our Resources Page for valuable FREE resources to help with your planning and permitting questions and book a call with our Principal Architect. At UrbanLab Architecture, we understand the unique challenges and opportunities that small business owners face. With over 20 years of experience, our firm is dedicated to providing innovative architectural solutions that not only meet your needs but also enhance your business's potential. Based in Washington, DC, we specialize in transforming commercial spaces into dynamic environments that reflect your brand and vision. Our expertise spans hospitality, multi-family, and mixed-use developments, ensuring that your project benefits from our comprehensive approach to design and planning. Led by Principal Architect David den Daas, our team is committed to delivering excellence from concept to completion. We offer a full range of services, including feasibility studies, design, permitting, and construction, all tailored to fit your specific goals and budget. With a focus on quality, efficiency, and sustainability, UrbanLab Architecture is your trusted partner in creating spaces that inspire and succeed. Let's collaborate to bring your business vision to life. Contact us today to explore how we can elevate your business through exceptional design and permitting expertise.

"David and his team were professional, diligent, creative and prompt. They immediately identified the issues and guided us from design through permitting. He went above and beyond and we couldn’t recommend any higher."

Pete M on July 2024

Visit our Resources Page for valuable FREE resources to help with your planning and permitting questions and book a call with our Principal Architect. At UrbanLab Architecture, we understand the unique challenges and opportunities that small business owners face. With over 20 years of experience, our firm is dedicated to providing innovative architectural solutions that not only meet your needs but also enhance your business's potential. Based in Washington, DC, we specialize in transforming commercial spaces into dynamic environments that reflect your brand and vision. Our expertise spans hospitality, multi-family, and mixed-use developments, ensuring that your project benefits from our comprehensive approach to design and planning. Led by Principal Architect David den Daas, our team is committed to delivering excellence from concept to completion. We offer a full range of services, including feasibility studies, design, permitting, and construction, all tailored to fit your specific goals and budget. With a focus on quality, efficiency, and sustainability, UrbanLab Architecture is your trusted partner in creating spaces that inspire and succeed. Let's collaborate to bring your business vision to life. Contact us today to explore how we can elevate your business through exceptional design and permitting expertise.

"David and his team were professional, diligent, creative and prompt. They immediately identified the issues and guided us from design through permitting. He went above and beyond and we couldn’t recommend any higher."

Pete M on July 2024


Avatar for Reston Restoration Contracting LLC

Reston Restoration Contracting LLC

600 Roosevelt Blvd Apt 402
5.00(
2
)
Approved Pro

Reston Restoration Contracting LLC

600 Roosevelt Blvd Apt 402
5.00(
2
)
Approved Pro
10 years of experience

At Reston Restoration, we bring nearly 20 years of experience serving Washington, D.C. and the surrounding region. Fully licensed and insured (up to $1,000,000), our team is dedicated to reliable, detail-oriented workmanship on every project. We specialize in roofing (asphalt, TPO, and specialty systems), flooring installation and refinishing, exterior and interior painting, custom carpentry, and full-scale home restoration. From estimate to final walkthrough, we combine skilled craftsmanship with clear communication so clients feel confident every step of the way. Whether replacing a roof, refinishing floors, restoring storm damage, or completing a major remodel, we treat every home as if it were our own. We pride ourselves on punctuality, cleanliness, and transparency—with clear estimates, documented change orders, and no surprise charges.

"I wish I could give Maarten and his team of contractors 10 stars. He far exceeded our expectations. His contractors/workers were always working, doing things that went beyond the scope of the project. Our house/yard was in better shape than when it started. He is one of the only, if not only, contractor I would have do worker prior to getting an estimate. While he was installing the new roof (with an estimate) we had his team working on eight other projects with just a verbal ballpark estimate and he came in below what was expected. Maarten is extremely knowledgeable and was able to resolve issues we have had that other contractors were unable to fix. I would recommend Reston Restoration for any project in the home. Thank you to the Reston Restoration's team"

Steve K on October 2025

At Reston Restoration, we bring nearly 20 years of experience serving Washington, D.C. and the surrounding region. Fully licensed and insured (up to $1,000,000), our team is dedicated to reliable, detail-oriented workmanship on every project. We specialize in roofing (asphalt, TPO, and specialty systems), flooring installation and refinishing, exterior and interior painting, custom carpentry, and full-scale home restoration. From estimate to final walkthrough, we combine skilled craftsmanship with clear communication so clients feel confident every step of the way. Whether replacing a roof, refinishing floors, restoring storm damage, or completing a major remodel, we treat every home as if it were our own. We pride ourselves on punctuality, cleanliness, and transparency—with clear estimates, documented change orders, and no surprise charges.

"I wish I could give Maarten and his team of contractors 10 stars. He far exceeded our expectations. His contractors/workers were always working, doing things that went beyond the scope of the project. Our house/yard was in better shape than when it started. He is one of the only, if not only, contractor I would have do worker prior to getting an estimate. While he was installing the new roof (with an estimate) we had his team working on eight other projects with just a verbal ballpark estimate and he came in below what was expected. Maarten is extremely knowledgeable and was able to resolve issues we have had that other contractors were unable to fix. I would recommend Reston Restoration for any project in the home. Thank you to the Reston Restoration's team"

Steve K on October 2025


Avatar for Top Remodeling

Top Remodeling

1620 E Jefferson St, PL14
5.00(
20
)
Approved Pro

Top Remodeling

1620 E Jefferson St, PL14
5.00(
20
)
Approved Pro
Super Service Award
Customers say: Quick response
Recommended by 95% of Angi customers
Recommended by 95% of HomeAdvisor customers
186 local quotes requested

Top Remodeling is a Rockville remodeling contractor providing residential homeowners with the highest quality remodeling services. We provide professional remodeling services, including kitchen remodeling, bathroom remodeling, ADU construction, and more. In addition, we help you with design, planning, permit, and construction process. We take great pride in our top-notch remodeling services in Rockville and ensure that every project we do turns out perfectly.

"Our place had good bones but didn’t work for our daily life. Every room felt cut off from the next. Ben and Teddy from Top Remodeling sat with us and came up with a better layout without changing the size of the home. They moved the hallway, opened the living area, and added a custom touch in almost every room. They rebuilt the inside from the studs and used solid-core doors and clean finishes. We went with soft white walls, bronze handles, and natural maple cabinets. Now, it all feels open and calm. Every room has a purpose."

Serenity H on June 2025

Top Remodeling is a Rockville remodeling contractor providing residential homeowners with the highest quality remodeling services. We provide professional remodeling services, including kitchen remodeling, bathroom remodeling, ADU construction, and more. In addition, we help you with design, planning, permit, and construction process. We take great pride in our top-notch remodeling services in Rockville and ensure that every project we do turns out perfectly.

"Our place had good bones but didn’t work for our daily life. Every room felt cut off from the next. Ben and Teddy from Top Remodeling sat with us and came up with a better layout without changing the size of the home. They moved the hallway, opened the living area, and added a custom touch in almost every room. They rebuilt the inside from the studs and used solid-core doors and clean finishes. We went with soft white walls, bronze handles, and natural maple cabinets. Now, it all feels open and calm. Every room has a purpose."

Serenity H on June 2025


Avatar for Professional Home Solutions LLC

Professional Home Solutions LLC

5509 4th St NE
4.78(
117
)
Approved Pro

Professional Home Solutions LLC

5509 4th St NE
4.78(
117
)
Approved Pro
Customers say: Quality work
Recommended by 94% of Angi customers
Recommended by 94% of HomeAdvisor customers
49 local quotes requested

All service contracts are highly detailed to ensure that the homeowner knows exactly what services they are paying for and what is included. We are a full service contractor able to fulfill the needs of all customers and projects both large and small. Please visit our website at www.professionalhomesolutions.net to learn more about our company.

"The quality and the fact that they were experienced, and they offered some advice, and it turned out their advice was better to follow."

Jay B on October 2025

All service contracts are highly detailed to ensure that the homeowner knows exactly what services they are paying for and what is included. We are a full service contractor able to fulfill the needs of all customers and projects both large and small. Please visit our website at www.professionalhomesolutions.net to learn more about our company.

"The quality and the fact that they were experienced, and they offered some advice, and it turned out their advice was better to follow."

Jay B on October 2025


Avatar for Two Brothers Handyman and Home Improvement Service, LLC

Two Brothers Handyman and Home Improvement Service, LLC

6004 Hibbling Ave
4.96(
75
)
Approved Pro

Two Brothers Handyman and Home Improvement Service, LLC

6004 Hibbling Ave
4.96(
75
)
Approved Pro
Super Service Award
Customers say: True professional
Recommended by 100% of Angi customers
Recommended by 100% of HomeAdvisor customers
285 local quotes requested

Two Brothers Handyman and Home Improvement Service has 20+ years experience and a "CLASS A LICENSE IN VA & DC". We love every type of project from large scale renovations to even the smallest of jobs! We specialize in quality workmanship at affordable prices. We take pride in maintaining a consistently high-caliber level of work that comes with a satisfaction guarantee. Open and honest lines of communication with our clients during every step of the project is key to building relationships with successful outcomes. Washington DC License #2705168243, Expiration 5/31/2020.

"Ruben and the team did such a great job on the first project (2-3yrs ago) that I asked them to come back and finish my condo's water heater closet, which showed wear and tear from past water damage. They did a fantastic job in repairing the closet and adjacent living room's dry walls that it looked seamless to the rest of the unit. The team was always conscious of keeping the work area clean as they closed the area off with tarp and placed drop cloths down. I greatly appreciate the amount of high-quality work done in a short time span, especially when asked within two weeks of the project starting. I've recommended the team to my family and friends if they ever need a job done right by a team who is professional, courteous, and knowledgeable."

Sophia L on April 2025

Two Brothers Handyman and Home Improvement Service has 20+ years experience and a "CLASS A LICENSE IN VA & DC". We love every type of project from large scale renovations to even the smallest of jobs! We specialize in quality workmanship at affordable prices. We take pride in maintaining a consistently high-caliber level of work that comes with a satisfaction guarantee. Open and honest lines of communication with our clients during every step of the project is key to building relationships with successful outcomes. Washington DC License #2705168243, Expiration 5/31/2020.

"Ruben and the team did such a great job on the first project (2-3yrs ago) that I asked them to come back and finish my condo's water heater closet, which showed wear and tear from past water damage. They did a fantastic job in repairing the closet and adjacent living room's dry walls that it looked seamless to the rest of the unit. The team was always conscious of keeping the work area clean as they closed the area off with tarp and placed drop cloths down. I greatly appreciate the amount of high-quality work done in a short time span, especially when asked within two weeks of the project starting. I've recommended the team to my family and friends if they ever need a job done right by a team who is professional, courteous, and knowledgeable."

Sophia L on April 2025


Avatar for CHEVY CHASE REMODELING

CHEVY CHASE REMODELING

6900 Wisconsin Ave
4.77(
170
)
Approved Pro

CHEVY CHASE REMODELING

6900 Wisconsin Ave
4.77(
170
)
Approved Pro
Customers say: Terrific value
Recommended by 91% of Angi customers
Recommended by 91% of HomeAdvisor customers
104 local quotes requested

26 employees. Cost is determined by the job. Travel charges may apply. Service fee applies. Extra charge for after-hours service. License #: 95598. Additional contact: jennifer depollar. Additional phone #: (240)535-6296. Additional service areas: calvert county & district of columbia. Additional services offered: siding, roofing, windows, kitchens, baths, flooring,painting. We work under the rowan group llc's licensing in Virginia and D.C.

"I wish I could give ten stars. Came home from Christmas to a literal waterfall in my house. Steven and his crew were absolutely the best team I could have asked for. Understanding, communicative, empathetic and on top of all that, the quality of their work is EXCELLENT. My entire first floor was taken down to studs and rebuilt and it's better than it was before the disaster."

Jen K on October 2025

26 employees. Cost is determined by the job. Travel charges may apply. Service fee applies. Extra charge for after-hours service. License #: 95598. Additional contact: jennifer depollar. Additional phone #: (240)535-6296. Additional service areas: calvert county & district of columbia. Additional services offered: siding, roofing, windows, kitchens, baths, flooring,painting. We work under the rowan group llc's licensing in Virginia and D.C.

"I wish I could give ten stars. Came home from Christmas to a literal waterfall in my house. Steven and his crew were absolutely the best team I could have asked for. Understanding, communicative, empathetic and on top of all that, the quality of their work is EXCELLENT. My entire first floor was taken down to studs and rebuilt and it's better than it was before the disaster."

Jen K on October 2025

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FAQs for addition to existing structure building service projects in Washington DC, DC

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 Washington DC, DC 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.