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Addition to existing structure builders in Ashburn

Avatar for 3D Design Space
3D Design Space
6435 Lincolnia Road
5.00(
16
)
Approved Pro
3D Design Space
6435 Lincolnia Road
5.00(
16
)
Approved Pro
Customers say: Quality work
33 years of experience
Free onsite estimate

3D Design Space was established in 1992 Specializing in Additions, Major Renovations, Bathroom, Kitchen, Basement, Garage Remodels, design, and architectural services in Northern Virginia. Quality customer service and workmanship is a number one priority of 3D Design Space. We are fully insured and licensed.

"An amazing, super nice guy to work with...great communication and design ideas. I've never seen someone (and his crew) work so hard to complete a job! I would hire again in a heartbeat."

Melissa E on July 2015

3D Design Space was established in 1992 Specializing in Additions, Major Renovations, Bathroom, Kitchen, Basement, Garage Remodels, design, and architectural services in Northern Virginia. Quality customer service and workmanship is a number one priority of 3D Design Space. We are fully insured and licensed.

"An amazing, super nice guy to work with...great communication and design ideas. I've never seen someone (and his crew) work so hard to complete a job! I would hire again in a heartbeat."

Melissa E on July 2015


Moses Housing LLC
2753 Sutton Rd
4.94(
8
)
Approved Pro
Moses Housing LLC
2753 Sutton Rd
4.94(
8
)
Approved Pro
Customers say: Quick response
Recommended by 100% of Angi customers
Recommended by 100% of HomeAdvisor customers
5 years of experience

We are 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.

"They replaced my beaten wooden deck with a new composite one. The price was more than fair after shopping around. What I liked from the experience was the cleanliness and speed. Everything we agreed on they did in timely manner."

Charlie H on October 2023

We are 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.

"They replaced my beaten wooden deck with a new composite one. The price was more than fair after shopping around. What I liked from the experience was the cleanliness and speed. Everything we agreed on they did in timely manner."

Charlie H on October 2023


HW Mechanical and Remodeling
65 Richland Rd
New on HomeAdvisorNew on Angi
Approved Pro
HW Mechanical and Remodeling
65 Richland Rd
New on AngiNew on HomeAdvisor
Approved Pro
15 years of experience
Free onsite estimate

We take great pride in our experience, expertise, quality, and customer service that we provide to meet the consumers' needs. It is our mission to provide excellent workmanship and complete customer satisfaction 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 professional manner. Our reputation is based on service, safety, and quality, regardless of how large or small the job.

We take great pride in our experience, expertise, quality, and customer service that we provide to meet the consumers' needs. It is our mission to provide excellent workmanship and complete customer satisfaction 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 professional manner. Our reputation is based on service, safety, and quality, regardless of how large or small the job.


Avatar for Q3 Designs LLC
Q3 Designs LLC
410 Course St
4.83(
3
)
Approved Pro
Q3 Designs LLC
410 Course St
4.83(
3
)
Approved Pro
Customers say: Terrific value
Recommended by 100% of Angi customers
Recommended by 100% of HomeAdvisor customers
2 years of experience

We are 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.

"I had Q3 Design complete a home addition project for me. They did tremendous work. From the moment I contacted them they showed high expertise and professionalism. They managed it all, from design, permit applications and inspections, to devoting meticulous attention to complete the project successfully on time and with the highest industry standards and materials. Their price is very fair and their work ethics is highly commendable and reliable. My family and I can't be happier with the end results. We'll contact them for sure again for any new home improvements."

Julio H on July 2023

We are 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.

"I had Q3 Design complete a home addition project for me. They did tremendous work. From the moment I contacted them they showed high expertise and professionalism. They managed it all, from design, permit applications and inspections, to devoting meticulous attention to complete the project successfully on time and with the highest industry standards and materials. Their price is very fair and their work ethics is highly commendable and reliable. My family and I can't be happier with the end results. We'll contact them for sure again for any new home improvements."

Julio H on July 2023


Avatar for Alltecs, LLC
Alltecs, LLC
1800 Diagonal Rd Ste 600
3.75(
14
)
Approved Pro
Alltecs, LLC
1800 Diagonal Rd Ste 600
3.75(
14
)
Approved Pro
Customers say: Terrific value
11 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.

"This company gets a 0 rating from me. My experience with Alltecs was terrible please do you research on this company before hiring them I even encourage you to go and physically see work that they have done instead of relying on their photos. I would never recommend their company for anything. I hired Alltecs for a 203K rehab July 2021 by March 2023 they quit and nothing was completed in my house. Alltecs had already been paid a substantial amount of money, for a totally f....ed up job and to add Insult to injury Dawnta Million filed a Mechanics Lien on my property in which he never enforced. The nerve of somebody who don't pay his subcontractors (found that out later) so please please please don't get defrauded by Alltecs like I did."

Karma K on May 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.

"This company gets a 0 rating from me. My experience with Alltecs was terrible please do you research on this company before hiring them I even encourage you to go and physically see work that they have done instead of relying on their photos. I would never recommend their company for anything. I hired Alltecs for a 203K rehab July 2021 by March 2023 they quit and nothing was completed in my house. Alltecs had already been paid a substantial amount of money, for a totally f....ed up job and to add Insult to injury Dawnta Million filed a Mechanics Lien on my property in which he never enforced. The nerve of somebody who don't pay his subcontractors (found that out later) so please please please don't get defrauded by Alltecs like I did."

Karma K on May 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
17 local quotes requested
40 years of experience

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


Installation Services, LLC
17650 Possum Point Road Suite A
4.92(
24
)
Approved Pro
Installation Services, LLC
17650 Possum Point Road Suite A
4.92(
24
)
Approved Pro
Customers say: Quality work
Recommended by 95% of Angi customers
Recommended by 95% of HomeAdvisor customers
25 years of experience

At Installation Services, LLC, we pride our company on reliability, great communication, integrity, and quality work. We strongly believe in giving our absolute best in all the work we perform. We are experts and will always keep you educated about the work process. We look forward to earning your business.

"We will recommend Installation Services LLC, to anyone who is looking for an experienced, knowledgeable, and honest contractor. It is not easy to find a high-quality/ price service company these days. Corrine, Bud, and their team from the start to the end of our project were very professional, committed, and honest. We didn't experience any hard times with Installation Services LLC's team during any phase of our project, which was an unfinished basement. We are so happy with the service done. Moreover, Bud confirmed the two-year warranty, that it's hard to get it with a contractor. Thank you!"

Majda K on October 2023

At Installation Services, LLC, we pride our company on reliability, great communication, integrity, and quality work. We strongly believe in giving our absolute best in all the work we perform. We are experts and will always keep you educated about the work process. We look forward to earning your business.

"We will recommend Installation Services LLC, to anyone who is looking for an experienced, knowledgeable, and honest contractor. It is not easy to find a high-quality/ price service company these days. Corrine, Bud, and their team from the start to the end of our project were very professional, committed, and honest. We didn't experience any hard times with Installation Services LLC's team during any phase of our project, which was an unfinished basement. We are so happy with the service done. Moreover, Bud confirmed the two-year warranty, that it's hard to get it with a contractor. Thank you!"

Majda K on October 2023


SA Home Improvement, Inc.
7217 Lockport Place, Suite 209
4.89(
51
)
Approved Pro
SA Home Improvement, Inc.
7217 Lockport Place, Suite 209
4.89(
51
)
Approved Pro
Customers say: Quick response
Recommended by 100% of Angi customers
Recommended by 100% of HomeAdvisor customers
22 years of experience

SA Home Improvement Inc is a full-service design and builds a residential remodeling company based in Virginia. We have been in business for more than 17 years. We understand that your construction project is an investment. Whether it is the construction of a new home, in addition to your home, or a remodel any number of commercial considerations, we offer quality construction with an emphasis on service and communication. We are customer-focused and understand that your construction project is significant to you. For every project, we offer quality construction with an emphasis on service and communication. Our remodeling specialists at SA can provide innovative concepts and designs to meet your needs. Customer satisfaction is our mission.

"Seddik and his crew did great work on my house addition. The constant communication and attention to detail made the evolution stress-free. We were able to move back in a week earlier than initially quoted and the final cost was within a few percent of the estimate, mostly due to additional touches we added on during the build. He was also extremely responsive to any issues that popped up after the job was finished to make sure everything turned out exactly like our family wanted. Can't recommend them enough to friends and anybody else who will listen."

Mark G on August 2024

SA Home Improvement Inc is a full-service design and builds a residential remodeling company based in Virginia. We have been in business for more than 17 years. We understand that your construction project is an investment. Whether it is the construction of a new home, in addition to your home, or a remodel any number of commercial considerations, we offer quality construction with an emphasis on service and communication. We are customer-focused and understand that your construction project is significant to you. For every project, we offer quality construction with an emphasis on service and communication. Our remodeling specialists at SA can provide innovative concepts and designs to meet your needs. Customer satisfaction is our mission.

"Seddik and his crew did great work on my house addition. The constant communication and attention to detail made the evolution stress-free. We were able to move back in a week earlier than initially quoted and the final cost was within a few percent of the estimate, mostly due to additional touches we added on during the build. He was also extremely responsive to any issues that popped up after the job was finished to make sure everything turned out exactly like our family wanted. Can't recommend them enough to friends and anybody else who will listen."

Mark G on August 2024


Avatar for Keraman Construction Company
Keraman Construction Company
3920 Silk Tree Ct
4.67(
9
)
Approved Pro
Keraman Construction Company
3920 Silk Tree Ct
4.67(
9
)
Approved Pro
Super Service Award
Customers say: True professional
71 local quotes requested
24 years of experience

Welcome to Keraman Construction Company! 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!

"Very fast and effective service."

Jason W on March 2025

Welcome to Keraman Construction Company! 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!

"Very fast and effective service."

Jason W on March 2025


Avatar for District Renovations LLC
District Renovations LLC
1336 Spring Hill Rd
4.83(
15
)
Approved Pro
District Renovations LLC
1336 Spring Hill Rd
4.83(
15
)
Approved Pro
Customers say: Terrific value
78 local quotes requested
15 years of experience

Here at District Renovations LLC, 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!

"Peter and his team did a fantastic job with my master bathroom remodel. I was home during the job so I got to see ALL of the work as it was being done. Peter gave me continuous status updates about the progress and his team were good at letting me know when problems arose that needed clarification."

Kevin M on June 2025

Here at District Renovations LLC, 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!

"Peter and his team did a fantastic job with my master bathroom remodel. I was home during the job so I got to see ALL of the work as it was being done. Peter gave me continuous status updates about the progress and his team were good at letting me know when problems arose that needed clarification."

Kevin M on June 2025

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FAQs for addition to existing structure building service projects in Ashburn, VA

Yes, you can add a bathroom on a concrete slab, but the crew will need to saw-cut the slab, trench in new supply and drain lines, and then patch the concrete without weakening the foundation. Working with an experienced plumber and concrete pro keeps the structure intact and helps the new bathroom pass inspections.

schedule covers planning, permits, framing, rough-ins, finishes, and punch-list items. 

Larger spaces or extensive plumbing and electrical upgrades can stretch the timeline, while a simple powder-room conversion may wrap up faster. Hiring licensed pros helps keep the schedule on track and the work up to code.

The best location depends on how your family uses the space. An upstairs bath keeps nighttime trips close to the bedrooms, while a first-floor powder room is handy for guests and everyday traffic. 

Think about where plumbing lines already run, how much square footage you can spare, and what layout changes fit your budget. A pro can map out the smartest spot and handle any code hurdles.

With the right planning, you can carve out a bathroom in almost any part of the house. A successful addition requires sufficient space, proper ventilation, and access to plumbing and electrical systems. Structural modifications and adherence to building codes are essential. 

This process demands careful planning and the coordination of specialized professionals who ensure that the new space meets all code requirements and functional needs.

Under specific conditions, adding an extra bedroom can boost home value more than adding a bathroom. Home value is driven by overall configuration, market demand, and functional balance. A new bedroom influences the property’s appeal in different ways, while an additional bathroom enhances living convenience. Evaluating the current layout and market trends determines the optimal choice for maximum value.

The Ashburn, VA 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.
master bedroom with fireplace
Jun 26, 2025
Jun 26, 2025
Budget for bedroom remodel costs based on factors such as bedroom size, remodel type, features, materials, labor, and more.
CONTRACTOR LOOKING OVER HOME DEVELOPMENT
Apr 19, 2025
Apr 19, 2025
Budget for your general contractor’s hourly rate by considering factors such as project scope, fee structure, pricing model, and more.
Outdoor view of the modern house
Jun 16, 2025
Jun 16, 2025
Explore how square footage, room type, home additions, and other common factors affect house renovation costs with our detailed cost guide.
BRIGHT OPEN ATTIC SPACE
Jun 10, 2025
Jun 10, 2025
An in-law suite is a great solution for people who have family visiting often. Explore how much an in-law suite costs and prep to build yours.
white and gray kitchen with butchers block countertop
Apr 8, 2025
Apr 8, 2025
Looking to enhance the warmth and utility of your kitchen? Explore how much a butcher block countertop costs and start your budget here.
built-in outdoor kitchen with grill and sink
Apr 30, 2025
Apr 30, 2025
Budget for outdoor kitchen costs based on factors such as appliances, materials, permits, labor, amenities, kitchen size, customizations, and more.
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