Barnabas Ko Construction Company

4.69 |82 Verified Ratings
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Barnabas Ko Construction Company

4.69 | 82 Verified Ratings
Write a Review


10201 Dundalk Street
Fairfax, VA 22032
Your use of our services is governed by our Terms & Conditions

Barnabas Ko Construction Company

Barnabas Ko Construction has been serving the VA/MD/DC area for over 30 years. We are Class A licensed and insured. We believe in honest, dependable, and quality work at fair prices.


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Service Area

  • Alexandria
  • Fairfax
  • Herndon
  • Springfield
  • McLean
  • Reston
  • Vienna
  • Falls Church
  • Dulles
  • Merrifield
  • Stafford
  • Fredericksburg
  • Sterling
  • Ashburn
  • Chantilly
  • Centreville
  • Warrenton
  • Arlington
  • Woodbridge
  • Lorton
  • Dumfries
  • Manassas
  • Oakton
  • Haymarket
  • Gainesville
  • Quantico
  • Upperville
  • Burke
  • Annandale
  • Midland
  • Catharpin
  • Mount Vernon
  • Aldie
  • Broad Run
  • Fairfax Station
  • Fort Belvoir
  • Clifton
  • Newington
  • Great Falls
  • Bealeton
  • Dunn Loring
  • Fort Myer
  • Bristow
  • Greenway
  • Markham
  • See All >

Services Offered

  • Vinyl Siding Repair

Areas of Expertise

  • Fiber Cement / Hardiplank Siding
  • Premium Vinyl Siding
  • #1 rating with Building and Remodeling Professional
  • Integrated Roofing System
  • Window Replacement

Product Brands Used

  • Alside
  • Atrium
  • Simonton Windows and Doors
  • Therma Tru Doors
  • Alcoa
  • Alside
  • CertainTeed
  • James Hardie
  • Wolverine

Quick Facts

Business Hours
8:00 AM to 6:00 PM
8:00 AM to 6:00 PM
8:00 AM to 6:00 PM
8:00 AM to 6:00 PM
8:00 AM to 6:00 PM
8:00 AM to 6:00 PM
8:00 AM to 6:00 PM
(Please call to confirm)
  • Free Estimates
  • Credit Cards Accepted


In Business Since: 1980
State Licensing
Trade: Class A Contractor
License #: 2705071387
Expiration: 10-31-2022
Trade: Commercial Improvement Contracting (CIC)
License #: 2705071387
Expiration: 10-31-2022
Trade: Home Improvement Contracting (HIC)
License #: 2705071387
Expiration: 10-31-2022
HomeAdvisor Screened. View Details

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To find more licensing information for your state, visit our Licensing Requirements page.

Business Overview

How We Got Started

We started in this industry in 1983.

We describe our business as Family owned and operated


Barnabas Ko Construction Company

My Work
4 Projects
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Ratings & Reviews
Barnabas Ko Construction Company

Real feedback from real homeowners.
Learn more about this pro by reading the ratings and reviews below.
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Showing 1-10 of 82
  Page 1 of 9
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1.0   |  
I would not recommend this company to anyone. They did our roof a few months ago and they did a great job, so when we needed new siding and gutters we called them and scheduled the work. The day they were supposed to come no one showed up, so we called Mr Ko. He came over and then explained they were not coming. Then we found out that the estimate he gave was only for siding, not the trim (we told him we wanted everything replaced, so do not know why there was confusion). The new estimate was double. We were very frustrated but decided to still use them. Then after lots of back and forth making sure they understood exactly what we needed (there was still lots of confusion), they scheduled and rescheduled several times. Then they finally showed up and started the job. The crew was rude and worked very slow, often leaving for several hours at a time. One day was cancelled for extreme weather, and they left everything in our yard despite 50 mph wind gusts. Finally the second day they finished and after they left I realized they put the numbers back up on our house off center and one of the numbers was crooked (it looked ridiculous). I emailed them and they came right back out and fixed it. They told me they would be back Monday (it was Sat), because even though the job was done, they decided to leave ALL of their ladders, siding, boxes, screws, scaffolding, etc, in my yard. Then that night I went to deadbolt the door, and it did not work....they messed up our door while replacing the siding. We had them come back out Monday morning. The crew was very rude, and tried to rush out of there. Mr Ko tried to pick up the check earlier but we told him we were not paying until he made it right. The crew just kept asking for the check. They somewhat fixed the door (it still is not the same and is hard to lock), so we paid and they left. We will never use them again, and cannot recommend them to anyone else.
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4.5   |  
Review by in Stafford, VA
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4.0   |  
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5.0   |  
I like my new siding and capping. House looks like new.
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5.0   |  
This is an excellent company
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1.0   |  
Review by in Stafford, VA
Project: Window Repair
I hired Mr, Ko to repair four windows because of water leakage and to replace six, along with a new roof. I still have water leakage on the 4 windows. He assured he would be able to repair the leakage, however, his window contractor has been back 3 different times to fix the leakage that was already repair. thus, I must hired true window repair contractor to fix the problem. All Mr. Ko and his crew keeps blaming previous contractor, but I hired him to fix their problem not to point out. SO NO, I would not recommend them. I have to hire a different contractor to follow up on all the window repair they did at my home.
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5.0   |  
Review by in Clifton, VA
They are currently installing all of our siding and we are very happy so far. Mr. Ko is very nice and provided me with a reasonable estimate for the siding we wanted.
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4.0   |  
Review by in Vienna, VA
Project: New Windows - 6 +
I am very happy with the quality of the windows. The reason I give them 4 stars, is because what made me want to replace the windows is that the windows down sills were rotten (the windows were 30 years old) and water was dripping down the wall through the sills. I informed the owner the day he came to the house to give us an estimate, but when the technicians came for the installation, they claimed not to know anything about the windows sills replacement, for which had brought no new wood. For me the whole point was to change the window sills, a d of course get efficient windows, and I would see, had I not be at the house during the installation, whether they would have changed the sills or not. For the rest, they did a good job.
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5.0   |  
Review by in Great Falls, VA
Project: New Windows - 3-5
Excellent service from Mr Ko We had to add a bit of extra work because of size and he accommodated the revision with a very fair adjustment of price. He reviewed the work as it progressed and the final product. We had 3very large picture windows replaced. I Can really recommend this company. Thank you Mr Ko.
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5.0   |  
Excellent job. Was on time, friendly. Would recommend to all.
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Showing 1-10 of 82
  Page 1 of 9

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