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Addition to existing structure builders in Washington DC

Avatar for ACS Construction

ACS Construction

6089 Majors Lane, Suite 10
5.00(
4
)
Approved Pro

ACS Construction

6089 Majors Lane, Suite 10
5.00(
4
)
Approved Pro
Customers say: Quick response
Recommended by 100% of Angi customers
Recommended by 100% of HomeAdvisor customers
25 years of experience

Trust ACS Construction in Washington DC NW. to handle all your new construction and remodeling projects. We have earned a reputation for excellence, thanks to our dedicated team of employees and associates, as well as our huge network of vendors. Despite the high level of competition in the industry , we have managed to rise above and deliver first-rate services every time. We are not only HomeAdvisor members, but you can also find us on BBB, Houzz, NARI, NKBA. More than just arriving at your location on time, we also make it a point to finish the job before the deadline. We will even extend hours if the situation calls for it. Unlike other companies, we thoroughly explain the entire process so you know what is happening. We will constantly update you with the status of completion and will not impose something that you do not need.

"I hired German to renovate our basement (utility room, laundry room, storage...), including a complete overhaul of plumbing and wiring. I was extremely pleased with the quality of work, the organization of various activities, the price asked and the follow-up. By employing skilled and efficient workers licensed for plumbing (water and gas), electrical and carpentry/drywall the coordination of the various trades was limited to the strict minimum. I would not hesitate to recommend German for similar renovation/extension projects."

Alain L on October 2023

Trust ACS Construction in Washington DC NW. to handle all your new construction and remodeling projects. We have earned a reputation for excellence, thanks to our dedicated team of employees and associates, as well as our huge network of vendors. Despite the high level of competition in the industry , we have managed to rise above and deliver first-rate services every time. We are not only HomeAdvisor members, but you can also find us on BBB, Houzz, NARI, NKBA. More than just arriving at your location on time, we also make it a point to finish the job before the deadline. We will even extend hours if the situation calls for it. Unlike other companies, we thoroughly explain the entire process so you know what is happening. We will constantly update you with the status of completion and will not impose something that you do not need.

"I hired German to renovate our basement (utility room, laundry room, storage...), including a complete overhaul of plumbing and wiring. I was extremely pleased with the quality of work, the organization of various activities, the price asked and the follow-up. By employing skilled and efficient workers licensed for plumbing (water and gas), electrical and carpentry/drywall the coordination of the various trades was limited to the strict minimum. I would not hesitate to recommend German for similar renovation/extension projects."

Alain L on October 2023


Avatar for Banks & Son-Builders

Banks & Son-Builders

6325 Johensu Dr
4.66(
32
)
Approved Pro

Banks & Son-Builders

6325 Johensu Dr
4.66(
32
)
Approved Pro
Customers say: Quality work
Recommended by 93% of Angi customers
Recommended by 93% of HomeAdvisor customers
7 years of experience

We are a family owned business operating over 40 years in the DMV area, primarily in Washington, D.C. and Montgomery County.  We are BUILDERS, not handymen.  In addition to our Maryland and Washington, D.C. Home Improvement Licenses, we are licensed Maryland Home Builders.  Over the years we've built dozens of CUSTOM homes, start to finish, that are still loved and lived in by their homeowners today!  Although we are a small firm, our scope of work is large.

"Kept us up to date on progress of project and delivered by due date as promised. Very high quality work. Owner and workers were trustful and respectful."

D B on April 2024

We are a family owned business operating over 40 years in the DMV area, primarily in Washington, D.C. and Montgomery County.  We are BUILDERS, not handymen.  In addition to our Maryland and Washington, D.C. Home Improvement Licenses, we are licensed Maryland Home Builders.  Over the years we've built dozens of CUSTOM homes, start to finish, that are still loved and lived in by their homeowners today!  Although we are a small firm, our scope of work is large.

"Kept us up to date on progress of project and delivered by due date as promised. Very high quality work. Owner and workers were trustful and respectful."

D B on April 2024


Avatar for Alltecs, LLC

Alltecs, LLC

1800 Diagonal Rd Ste 600
3.83(
15
)
Approved Pro

Alltecs, LLC

1800 Diagonal Rd Ste 600
3.83(
15
)
Approved Pro
Customers say: Terrific value
15 local quotes requested
10 years of experience

At Alltecs, we are a leading minority-owned construction firm dedicated to delivering exceptional residential and commercial construction services throughout the DC area. With a strong commitment to professionalism, integrity, quality, and service, we have established ourselves as a trusted name in the industry. Our company was founded with a vision to provide top-notch construction solutions that exceed our clients' expectations. We understand that every project is unique, and our team of skilled professionals brings a wealth of expertise and experience to every endeavor. From concept to completion, we strive for excellence and ensure that each project is executed with meticulous attention to detail.

"I had a very good experience with Alltecs. I love my Kitchen it’sso beautiful, everyone who comes over compliments it. I definitely recommend!"

Johnny H on September 2025

At Alltecs, we are a leading minority-owned construction firm dedicated to delivering exceptional residential and commercial construction services throughout the DC area. With a strong commitment to professionalism, integrity, quality, and service, we have established ourselves as a trusted name in the industry. Our company was founded with a vision to provide top-notch construction solutions that exceed our clients' expectations. We understand that every project is unique, and our team of skilled professionals brings a wealth of expertise and experience to every endeavor. From concept to completion, we strive for excellence and ensure that each project is executed with meticulous attention to detail.

"I had a very good experience with Alltecs. I love my Kitchen it’sso beautiful, everyone who comes over compliments it. I definitely recommend!"

Johnny H on September 2025


Avatar for Reston Restoration Contracting LLC

Reston Restoration Contracting LLC

600 Roosevelt Blvd Apt 402
5.00(
1
)
Approved Pro

Reston Restoration Contracting LLC

600 Roosevelt Blvd Apt 402
5.00(
1
)
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.

"Not only they got the job right, but also on time, with daily updates, and a solution for every problem that came on the way. Rare in every way. "

Alexandros R on September 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.

"Not only they got the job right, but also on time, with daily updates, and a solution for every problem that came on the way. Rare in every way. "

Alexandros R on September 2025


Avatar for Solid Foundation Construction LLC

Solid Foundation Construction LLC

5.00(
3
)
Approved Pro

Solid Foundation Construction LLC

5.00(
3
)
Approved Pro
67 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 Kozan Construction, LLC

Kozan Construction, LLC

4584 Cornell Drive
4.74(
27
)
Approved Pro

Kozan Construction, LLC

4584 Cornell Drive
4.74(
27
)
Approved Pro
Customers say: True professional
40 years of experience
Free onsite estimate

We have over 10 years of experience in the business. Here at Kozan Construction, LLC, we pride our company on reliability, great communication, integrity and quality work. We are experts in our trade and will do our best to keep you as educated as we can on your particular task or project. We look forward to earning your business!

"The original project I hired them for was to replace leaky faucets in both the kitchen and bathroom. Frank, the owner, was responsive and professional. They scheduled the work promptly and showed up on time. Unexpected issues were discovered that required a second trip and additional work. They communicated everything clearly and the additional costs were handled separately and transparently. They also cleaned up after the work was done. I would hire them again."

Ruxandra B on June 2025

We have over 10 years of experience in the business. Here at Kozan Construction, LLC, we pride our company on reliability, great communication, integrity and quality work. We are experts in our trade and will do our best to keep you as educated as we can on your particular task or project. We look forward to earning your business!

"The original project I hired them for was to replace leaky faucets in both the kitchen and bathroom. Frank, the owner, was responsive and professional. They scheduled the work promptly and showed up on time. Unexpected issues were discovered that required a second trip and additional work. They communicated everything clearly and the additional costs were handled separately and transparently. They also cleaned up after the work was done. I would hire them again."

Ruxandra B on June 2025


Avatar for LH's Construction

LH's Construction

10560 Main Street, Suite 410G
4.13(
45
)
Approved Pro

LH's Construction

10560 Main Street, Suite 410G
4.13(
45
)
Approved Pro
Customers say: Quality work
48 local quotes requested
25 years of experience

Family owned and operated with over 30 years of experience in the home improvement industry LH construction are the expert you need for you're project! With us no job is to big or to small we never leave a project unfinished most importantly we never leave a homeowner unsatisfied we look forward to hearing from you!

"He is terrible, he did not finish the job before starting a new one."

pamela r on December 2021

Family owned and operated with over 30 years of experience in the home improvement industry LH construction are the expert you need for you're project! With us no job is to big or to small we never leave a project unfinished most importantly we never leave a homeowner unsatisfied we look forward to hearing from you!

"He is terrible, he did not finish the job before starting a new one."

pamela r on December 2021


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 Stout Restorations, Inc.

Stout Restorations, Inc.

3809 Quincy St
4.82(
17
)
Approved Pro

Stout Restorations, Inc.

3809 Quincy St
4.82(
17
)
Approved Pro
Customers say: Super punctual
Recommended by 100% of Angi customers
Recommended by 100% of HomeAdvisor customers
12 local quotes requested

Stout Restorations, Inc. is a general contracting company specializing in remodeling and restoration of historical homes. We provide services for residential, religious institutions, office buildings and restaurants clients. Stout Restorations, Inc. provides premium quality of craftsmanship and expertise to deliver a superior level of service to our clients. No matter what size of a project we manage each task with great attention to details, care and communicating positively towards mutual understanding with our clients to achieve a successful execution of a project.

"We needed an office area built in an open floor planned condominium, along with several bookcases. Jeff and his team proposed several ideas and we trusted his guidance. We could not be more happy with the results. The office area, bookcases and hidden storage are beautiful! Their work is top notch and well worth the money."

Doug E on April 2024

Stout Restorations, Inc. is a general contracting company specializing in remodeling and restoration of historical homes. We provide services for residential, religious institutions, office buildings and restaurants clients. Stout Restorations, Inc. provides premium quality of craftsmanship and expertise to deliver a superior level of service to our clients. No matter what size of a project we manage each task with great attention to details, care and communicating positively towards mutual understanding with our clients to achieve a successful execution of a project.

"We needed an office area built in an open floor planned condominium, along with several bookcases. Jeff and his team proposed several ideas and we trusted his guidance. We could not be more happy with the results. The office area, bookcases and hidden storage are beautiful! Their work is top notch and well worth the money."

Doug E on April 2024


Avatar for Skyi Enterprise LLC

Skyi Enterprise LLC

5.00(
2
)
Approved Pro

Skyi Enterprise LLC

5.00(
2
)
Approved Pro
Customers say: Quick response
Recommended by 100% of Angi customers
Recommended by 100% of HomeAdvisor customers
15 local quotes requested

Founded in 2014, Skyi Enterprises began as a passion project, transforming houses one flip at a time. Our work quickly caught the attention of local homeowners and businesses, who recognized our commitment to quality and attention to detail. From those humble beginnings, Skyi Enterprises has grown into a trusted name in the Washington, DC area, specializing in commercial storefronts, residential remodeling, total renovations and new home builds. ​Whether it’s creating a stunning new look for a storefront or bringing a homeowner’s vision to life, our team at Skyi Enterprises is dedicated to crafting spaces that blend form and function seamlessly. We pride ourselves on a client-centered approach that prioritizes clear communication, innovative design, and precision workmanship at every stage of the project. With years of expertise and a passion for transformation, Skyi Enterprises is here to make your renovation dreams a reality. Let’s build something extraordinary together!

"I had an amazing experience with Skyi Enterprise for my home renovation. I paid over $110K for this job in Baltimore, MD (21239). The team was very professional, efficient, and really listened to my needs. The quality of work was outstanding, and the project was completed on time. They kept me informed every step of the way. I highly recommend them for any renovation work!"

Taylor K on February 2025

Founded in 2014, Skyi Enterprises began as a passion project, transforming houses one flip at a time. Our work quickly caught the attention of local homeowners and businesses, who recognized our commitment to quality and attention to detail. From those humble beginnings, Skyi Enterprises has grown into a trusted name in the Washington, DC area, specializing in commercial storefronts, residential remodeling, total renovations and new home builds. ​Whether it’s creating a stunning new look for a storefront or bringing a homeowner’s vision to life, our team at Skyi Enterprises is dedicated to crafting spaces that blend form and function seamlessly. We pride ourselves on a client-centered approach that prioritizes clear communication, innovative design, and precision workmanship at every stage of the project. With years of expertise and a passion for transformation, Skyi Enterprises is here to make your renovation dreams a reality. Let’s build something extraordinary together!

"I had an amazing experience with Skyi Enterprise for my home renovation. I paid over $110K for this job in Baltimore, MD (21239). The team was very professional, efficient, and really listened to my needs. The quality of work was outstanding, and the project was completed on time. They kept me informed every step of the way. I highly recommend them for any renovation work!"

Taylor K on February 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.

  • A renovated kitchen with a waterfall island

    HomeAdvisor’s DIY Kitchen Remodel Cost Guide looks at the cost of buying supplies and doing the work yourself. Find the key cost factors and how to cut expenses.

  • Secret room within bookcase

    HomeAdvisor's expert guide walks you through the cost to build a secret room, whether you're creating a safe room for security or a fun space to fulfil your childhood fantasies. Use this guide to help plan your secret room project and explore room, concea

  • outdoor patio bar

    Explore the cost to build a bar in your home and learn how materials, wet vs. dry bars, and labor costs influence the total price of your project.