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Addition to existing structure builders in Washington DC
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
Reston Restoration Contracting LLC 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.
Reston Restoration Contracting LLC 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.
3DF LLC is a locally owned and operated company serving the Reston, VA area and surrounding communities. 3DF, LLC is a full service design & builder of your dream home and living environment. We can help expand your existing structure for you and your family to enjoy for years. Professional craftsmanship, reasonable rates, and friendly customer service. Call us now!
"Could not be happier with Jim's work. Remodeled master bath, kitchen, replaced front door, plus several other smaller tasks. Easy to work with. Has a talented eye for style and design. Kept me informed throughout the process. Has experience with the design board in my town (Reston). Never up-charged. I've recommended him to several neighbors already."
Brian B on August 2024
3DF LLC is a locally owned and operated company serving the Reston, VA area and surrounding communities. 3DF, LLC is a full service design & builder of your dream home and living environment. We can help expand your existing structure for you and your family to enjoy for years. Professional craftsmanship, reasonable rates, and friendly customer service. Call us now!
"Could not be happier with Jim's work. Remodeled master bath, kitchen, replaced front door, plus several other smaller tasks. Easy to work with. Has a talented eye for style and design. Kept me informed throughout the process. Has experience with the design board in my town (Reston). Never up-charged. I've recommended him to several neighbors already."
Brian B on August 2024
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
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. 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
BasementRemodeling.com / Basement Masters - licensed and insured, award winning Basement Remodeling and Finishing company. Highest rated basement renovation contractor in Maryland. Finished Basements are our specialty. We specialize in custom basement remodeling and finishing and other large-scale remodels. We offer free in home and over-the-phone estimate and consultation. Here at BasementRemodeling.com we believe that QUALITY AND EXCEPTIONAL CRAFTSMANSHIP must always come along with AFFORDABILITY. keywords: finished basement basements remodeling.
"Basement Remodeling just completed our basement remodeling project, on time and on budget. We couldn’t be more pleased! We investigated other remodeling companies but chose Basement Remodeling after our discussions with Eric, in part because we believed we could count on their expertise in handling the inevitable quirks of renovating a 70 year old house. Our project (and budget) was probably fairly modest when compared to many remodeling projects, and Eric offered suggestions for inexpensive problem solving (rehanging existing doors, for example) rather than trying to upsell us on other, more costly solutions. We fully renovated about one-third of the basement space which included the furnace, water heater and a small but completely unfinished laundry area. Basement Remodeling created an enclosed area for the furnace and water heater and neatly disguised the electric panel, adding a well-designed, efficient and attractive wet bar with cabinetry, appliances and a custom pantry. The renovation also included cosmetic upgrades to the rest of the basement space, adding new flooring and fresh paint. The space now looks absolutely terrific! The company took care of everything, from permitting to cleanup, and every person on the team was thoughtful, responsive and a pleasure to work with. Any concerns we had along the way were addressed immediately and quickly resolved to our satisfaction. We highly recommend Basement Remodeling!"
Tom C on June 2025
BasementRemodeling.com / Basement Masters - licensed and insured, award winning Basement Remodeling and Finishing company. Highest rated basement renovation contractor in Maryland. Finished Basements are our specialty. We specialize in custom basement remodeling and finishing and other large-scale remodels. We offer free in home and over-the-phone estimate and consultation. Here at BasementRemodeling.com we believe that QUALITY AND EXCEPTIONAL CRAFTSMANSHIP must always come along with AFFORDABILITY. keywords: finished basement basements remodeling.
"Basement Remodeling just completed our basement remodeling project, on time and on budget. We couldn’t be more pleased! We investigated other remodeling companies but chose Basement Remodeling after our discussions with Eric, in part because we believed we could count on their expertise in handling the inevitable quirks of renovating a 70 year old house. Our project (and budget) was probably fairly modest when compared to many remodeling projects, and Eric offered suggestions for inexpensive problem solving (rehanging existing doors, for example) rather than trying to upsell us on other, more costly solutions. We fully renovated about one-third of the basement space which included the furnace, water heater and a small but completely unfinished laundry area. Basement Remodeling created an enclosed area for the furnace and water heater and neatly disguised the electric panel, adding a well-designed, efficient and attractive wet bar with cabinetry, appliances and a custom pantry. The renovation also included cosmetic upgrades to the rest of the basement space, adding new flooring and fresh paint. The space now looks absolutely terrific! The company took care of everything, from permitting to cleanup, and every person on the team was thoughtful, responsive and a pleasure to work with. Any concerns we had along the way were addressed immediately and quickly resolved to our satisfaction. We highly recommend Basement Remodeling!"
Tom C on June 2025
We design and build custom outdoor living spaces in natural wood, low maintenance materials, natural stone, and concrete pavers. We're fully licensed and insured. We have been in business since 1989 and have thousands of satisfied customers throughout the DC Metro Area. We are A+ Rated with the BBB and have won Angie's List Super Service Award for 6 years in a row. We do not offer staining, sealing, and cleaning services.
"I'm absolutely thrilled with the work Sean and his crew did on our screened porch. I'm fairly particular and wanted to be involved in the project, probably more than most clients, and Sean worked with me throughout to get the porch I wanted. He was communicative and explained pros/cons of all the various options. Partway through the project, we realized our pre-existing front porch needed some repairs too, and Sean seamlessly added that to the project and was very reasonable on the price. Once the team started, the work went quickly but was clearly done very carefully. The attention to detail was fantastic, and the end result is a beautiful and functional porch that we're thrilled with. In the first week after the porch was completed, at least 6-8 different sets of neighbors stopped us to say it looked great. I would absolutely use American Deck again for a similar project and have recommended them to friends."
Andrew C on April 2025
We design and build custom outdoor living spaces in natural wood, low maintenance materials, natural stone, and concrete pavers. We're fully licensed and insured. We have been in business since 1989 and have thousands of satisfied customers throughout the DC Metro Area. We are A+ Rated with the BBB and have won Angie's List Super Service Award for 6 years in a row. We do not offer staining, sealing, and cleaning services.
"I'm absolutely thrilled with the work Sean and his crew did on our screened porch. I'm fairly particular and wanted to be involved in the project, probably more than most clients, and Sean worked with me throughout to get the porch I wanted. He was communicative and explained pros/cons of all the various options. Partway through the project, we realized our pre-existing front porch needed some repairs too, and Sean seamlessly added that to the project and was very reasonable on the price. Once the team started, the work went quickly but was clearly done very carefully. The attention to detail was fantastic, and the end result is a beautiful and functional porch that we're thrilled with. In the first week after the porch was completed, at least 6-8 different sets of neighbors stopped us to say it looked great. I would absolutely use American Deck again for a similar project and have recommended them to friends."
Andrew C on April 2025
Betterliving sunroom of the Capital area is sub division of Deck Soldier - family own business, over 14 years we spetialise in Deck building , restoration and screen porch constractions. December 2023 is time when we get opportunity to be come dealer for one of the best Sunroom manufactory -Betterliving sunrooms. Beginning of 2024 was education time. We spent 2 weeks with crew leaders on factory in PA - learning new materials and installation process. Another 2 weeks our sales team learned history of 70 years company and saw how every detail of sunroom is made, learn why Betterliving Sunrooms is best quality sunrooms on market. We proud that we build over 30 Sunrooms and screen porches in 2024 and all our customers happy with their final rooms. We sustain our business on quality and integrity. We look forward to earning your business -sunrooms (3 or 4 season , vinyl or aluminum) -screen rooms -porches -deck building -deck remodeling -deck restoration( washing, staining) -paver patio/retaining walls
"Deck Soldier (aka Betterliving) did a fantastic job of powerwashing and then sealing my deck, installing new handrails, and staining the swingset in the yard. Very pleased with their work and their professionalism."
Andrew H on October 2024
Betterliving sunroom of the Capital area is sub division of Deck Soldier - family own business, over 14 years we spetialise in Deck building , restoration and screen porch constractions. December 2023 is time when we get opportunity to be come dealer for one of the best Sunroom manufactory -Betterliving sunrooms. Beginning of 2024 was education time. We spent 2 weeks with crew leaders on factory in PA - learning new materials and installation process. Another 2 weeks our sales team learned history of 70 years company and saw how every detail of sunroom is made, learn why Betterliving Sunrooms is best quality sunrooms on market. We proud that we build over 30 Sunrooms and screen porches in 2024 and all our customers happy with their final rooms. We sustain our business on quality and integrity. We look forward to earning your business -sunrooms (3 or 4 season , vinyl or aluminum) -screen rooms -porches -deck building -deck remodeling -deck restoration( washing, staining) -paver patio/retaining walls
"Deck Soldier (aka Betterliving) did a fantastic job of powerwashing and then sealing my deck, installing new handrails, and staining the swingset in the yard. Very pleased with their work and their professionalism."
Andrew H on October 2024
With experience since 2005, we specialize in Home Remodeling, Kitchen, Bathrooms, Floors, Decks, Painting and more. When you hire District Renovations you are not only getting the best quality of home renovations in the area, but the most trusted contracting company in Northern Virginia. Our brand is constantly innovating and improving to deliver the best quality jobs to meet your expectations and satisfaction.
"The project was professionally executed both on quality and on budget. Alex is a top notch contractor."
Alberto M on June 2024
With experience since 2005, we specialize in Home Remodeling, Kitchen, Bathrooms, Floors, Decks, Painting and more. When you hire District Renovations you are not only getting the best quality of home renovations in the area, but the most trusted contracting company in Northern Virginia. Our brand is constantly innovating and improving to deliver the best quality jobs to meet your expectations and satisfaction.
"The project was professionally executed both on quality and on budget. Alex is a top notch contractor."
Alberto M on June 2024
FAQs for addition to existing structure building service projects in Washington DC, DC
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.
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