New Construction Windows: What They Are and When Your Home Needs Them

Key Takeaway

New construction windows are full-frame units installed into an exposed rough opening using a nail fin that ties into the wall’s flashing and water-resistive barrier. They are required for new builds, additions, and projects where siding is removed. ENERGY STAR data shows certified windows can cut household energy bills by up to 13% on average. The installation method, not the product grade, is what the term describes.

New construction windows are full-frame units set into an exposed rough opening, usually with a nail fin that ties into the wall’s flashing and water-resistive barrier. They need open studs and sheathing, which is why they show up on new builds, additions, and major exterior remodels. Most homeowners asking about them are really choosing an installation method, not a product grade. Remember two things: “new construction” describes a condition at the wall, and a unit’s rated performance is separate from the quality of its installation.

What Are New Construction Windows?

The window arrives as a complete unit, frame and sash together, and goes into the framed opening before cladding is installed or reinstalled. Anlin describes the nail fin plainly: it fastens the unit to the sheathing and holds it while the installer shims and screws it off. That is an attachment component. It is not a waterproofing system, and treating it like one is how walls get wet. Not every opening uses a fin, either. Masonry and stucco walls often call for block frames, wood bucks, or clips. Patio doors and sliding glass doors install into a rough opening the same way windows do.

New Construction vs. Replacement Windows: What’s Actually Different?

	Insert / pocket	Full-frame replacement	New construction
Removing	Sash only	Window and frame	Frame plus exterior material
Rough opening exposed	No	Usually	Yes
Hidden damage addressed	No	Partly	Yes
Opening can be resized	No	No	Yes
Attachment	Screws to old frame	Screws or clips	Nail fin or block frame

Both full-frame replacement and new-construction installation can reach the rough opening. The difference is frame type and how the unit attaches.

Can New Construction Windows Go Into an Existing Home?

Yes, when the exterior around the opening comes off. That makes sense when:

You are building new or adding on.
Siding is already coming off, so the sheathing is exposed anyway.
The frame is rotted, corroded, or out of square.
Water staining or soft sheathing appears after removing the trim.
Water is leaking in at an existing window or patio door.
The opening is being resized or converted for sliding glass doors.

Water leaks deserve their own note. A retrofit installation leaves the original frame, flashing, and drainage plane buried in the wall, so it covers the leak without correcting it and will never resolve it. A leaking window or patio door is almost always a new-construction installation.

If the exterior is staying intact, there is no leak, and a quick check shows the frame and drainage plane are sound, a replacement installation is usually the better option. Unnecessary demolition is not an upgrade.

Frames, Glass, and Design: The Best Choice for Curb Appeal

Frame materials and how they age

Vinyl is dimensionally stable and low maintenance, which makes it a common choice in both methods. Fiberglass is durable and moves very little with temperature. Wood looks classic but asks for ongoing upkeep. Aluminum is strong, though it needs a thermal break. Anlin’s vinyl frames are California-engineered and come in configurations for new-construction and replacement work alike.

Glass, ratings, and operation

Check the whole-unit NFRC label: U-factor, solar heat gain coefficient, visible transmittance, air leakage, and condensation resistance. Match U-factor and SHGC to your ENERGY STAR climate zone under Version 7.0, effective October 23, 2023. ENERGY STAR reports that replacing single-pane windows with certified windows lowers household energy bills by up to 13% on average nationwide, a modeled figure rather than a promise for your home. Low-E coatings, argon fills, and warm-edge spacers move those numbers, and Anlin’s Low-E3 glass is offered in both frame configurations. Then pick operation for how the room ventilates, and let grilles, hardware, and shape carry the design. Curb appeal is easy to underestimate here, because windows and doors set the rhythm of a facade. Gather inspiration photos before you order. A grille pattern is a design decision you cannot undo later.

Why Installation Determines Lasting Performance

Water management happens in order. Sill pan first. Jamb flashing laps over the pan, head flashing laps over the jambs, all integrated shingle-fashion with the water-resistive barrier so gravity carries water out. That sequence is exactly what a retrofit installation cannot rebuild, and it is why leaks call for the new-construction method. The 2024 IRC wall-covering provisions require flashing that drains to the exterior finish or the WRB, following manufacturer instructions or another approved method. Anlin directs installers to its product-specific instructions, local code, and FGIA AAMA 2400-21. Sealant smeared over a nail fin is not flashing. And check that NAFS ratings cover structural, air, and water performance, not energy alone.

Code and Structural Checks Before You Order

Egress: 5.7 sq. ft. net clear (5.0 for qualifying grade-floor openings), 24 in. minimum height, 20 in. minimum width, sill no higher than 44 in. A 20 x 24 opening alone does not comply.
Safety glazing: hazardous when the pane exceeds 9 sq. ft., the bottom edge sits under 18 in., the top edge over 36 in., and a walking surface is within 36 in. 16 CFR Part 1201 also covers glazed and sliding patio doors.
Upper floors: check whether opening-control or fall-protection devices apply.
Resized openings: headers, reinforced framing, early structural review, HVAC load implications.
Pre-1978 homes: EPA’s RRP Rule generally covers paid window replacement that disturbs painted surfaces. Hire a lead-safe certified contractor.

Adopted code editions and permit rules vary by jurisdiction, so check locally first.

Frequently Asked Questions

What do new construction windows mean?

The term describes how the unit is installed: into an exposed rough opening, typically with a nail fin. It says nothing about the age of your home.

What are the best windows for new construction?

There is no universal answer. The right unit is the one whose NFRC ratings, glass package, and frame material fit your wall assembly, climate zone, and code requirements.

Where can I buy new construction windows and doors?

Through manufacturers and their authorized dealers. Buying from a dealer who also installs keeps product selection, flashing method, and workmanship warranty with one accountable party. We’re an Anlin Authorized Dealer.

Get Your Free Estimate Today

You want curb appeal, comfort, and reduced energy costs that hold for decades. We’re family-owned, and we install premium Anlin windows and doors with Low-E3 glass and a lifetime warranty that includes accidental breakage coverage. Licensed, bonded, and insured, California General Building License #1092104, backed by our 15-year workmanship warranty. We don’t publish pricing, since every opening is different. Bring your inspiration photos, ask us about financing, and Get Your Free Estimate Today by calling (916) 699-7070.

Project Gallery

See the dramatic transformations we've achieved for Northern California homeowners

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What Our Clients Say

Hear from Northern California homeowners who trust us with their most important investments

      EXCELLENT  
   Based on 82 reviews 
    
 
 
 
   
 
 
       Posted on Google  
   
   Jeff Kresge 
 October 28, 2026
 
 
 Trustindex verifies that the original source of the review is Google. Gary & his crew were awesome with our window install They were efficient, excellent quality work, were polite & friendly. They listened to requests &concerns & remedied the 1 or 2  minor omissions. We highly recommend Modern Construction. The cost was reasonable & quite lower than other companies. Lastly, Gary was over the top patient with us. (It was a rather long process for us to finally say yes to his proposal.) Jeff
  
 
      Posted on Google  
   
   M Janney 
 September 28, 2026
 
 
 Trustindex verifies that the original source of the review is Google. Highly Highly recommend Modern Construction! Gary and his team are amazing on every level, from their customer service to the quality of their work. They truly care about the details and make sure even the smallest questions or concerns are addressed quickly and efficiently. We absolutely love the quality of their work and our experience with them. I really can’t recommend Gary and his team enough!
  
 
      Posted on Google  
   
   Amy 
 September 9, 2026
 
 
 Trustindex verifies that the original source of the review is Google. This is the second siding project we hired Gary and his team to complete on our farm property. Both projects presented challenges given the type and age of the structures. The first project was a complete residing plus other structural improvements of a manufactured home. This was completed last year. The current project that Gary just finished was the complete residing, OSB install, framing replacement, and window install on the original 1930’s barn. The barn had good bones but was in need of a complete overhaul. The transformation Gary and his team completed on the barn is nothing short of amazing. I have received so many compliments on the transformation.  We are so happy to be able to breathe new life into this structure that has so much history. Gary and his team are truly skilled craftsmen that are hard to find these days. They take pride in their work and the attention to detail is remarkable. I highly recommend Modern Construction Group.
  
 
      Posted on Google  
   
   Melissa Moore 
 August 21, 2026
 
 
 Trustindex verifies that the original source of the review is Google. We have now used Modern Construction twice, and both experiences have been outstanding. Our first project was a major renovation of our 3,500 sq. ft. home, where they installed James Hardie siding and Milgard windows. We were so pleased with the quality of their work that when we needed new Andersen sliding glass doors installed at our cabin, we didn’t hesitate to call them again.

What really sets Modern Construction apart is their communication, attention to detail, and genuine pride in their craftsmanship. They keep you informed throughout the project, show up when expected, and take the time to make sure every detail is done correctly. Their crews are professional, meticulous, and clearly care about the finished product.

Finding a contractor you trust enough to hire a second time says a lot. After two very different projects on two different homes, we have been extremely happy with both experiences. We would absolutely use Modern Construction again and highly recommend them to anyone looking for quality work and a company that truly stands behind its craftsmanship.

Five stars without hesitation!
  
 
      Posted on Google  
   
   Lesya Petiti 
 August 18, 2026
 
 
 Trustindex verifies that the original source of the review is Google. Choosing Modern Construction Group to do the siding and windows replacements on our home was truly the best decision. From quoting to final walk through, we were met with professionalism, respect for us and our property, honesty, and all around goodness. Gary and his team were great pleasure to deal with. The crew did their job with due diligence and impeccable craftsmanship as if they were fixing up their own homes. Project went extremely smooth and the house looks phenomenal. We couldn't be more satisfied and  highly recommend MCG to anyone looking for an honest and quality contractor.
  
 
      Posted on Google  
   
   Bonnie Geyer 
 July 27, 2026
 
 
 Trustindex verifies that the original source of the review is Google. There aren’t enough words to adequately express how wonderful Gary Chernyetsky & his team from Modern Construction are! The core of Gary’s credo is to provide the highest quality of work & total customer satisfaction which he proved to us completely. We needed work on our three story house; paint, siding, dry rot work & new windows. We met with Gary one morning & by afternoon we received a quote that was all-encompassing which included detailed description of the scope of work with pictures, description of products to be used & price. His team was polite & extremely hard working from 8am to 5:30 pm six days a week. Work was never delayed because of another customer. We were always treated as a priority. Gary came out everyday to check on work & if we had any questions. If anything was not done to our satisfaction, Gary would see to it that it was changed - without any contention. They also did extra work that was not listed in the scope of work like extra molding or repairs because Gary believes in doing quality work, not what expedient for them. He always puts the customer first. Our house is beautifully done thanks to Modern Construction. Plus Gary will come back six months later to see if all the work is still to our satisfaction!  Modern Construction is a rare company that fulfills their promises, goes above & beyond to please the customer & takes pride in providing the highest quality of work. We can state without reservation that Modern Construction is THE VERY BEST!
JUNE 2026
I needed my front door replaced & I went directly to Modern Construction Group because they did such an outstanding work on my house last year. Again, Gary & his team did an excellent & quick job. Gary comes out to the job to check on things & then comes back the next day to make sure we are satisfied-what excellent customer service! Every detail on my front door is perfect. I just love my new front door thanks to Gary & his team. DO NOT HESITATE TO HIRE THIS EXCELLENT COMPANY!
  
 
      Posted on Google  
   
   Morena Barahona Merlos 
 July 24, 2026
 
 
 Trustindex verifies that the original source of the review is Google. Choosing Modern Construction Group, Inc. to have all of my house windows installed was the best decision I made. Gary, the owner was excellent to work with; he came every day to personally supervise the work; to ask my opinion and if there were any concerns. The products he used are top of the line. The workers were totally professional, took great care to protect my floors and furniture and did a great job. Once they were done, my house looked like nothing had happened except that my windows now look fantastic. When I had a question, Gary was available right away and even after they were done with the job, I had something to show him and he came right away. The windows are beautiful and energy efficient, we already feel the difference. I highly recommend Gary and his company, Modern Construction Group, Inc.
  
 
      Posted on Google  
   
   Vitaliy Karashchuk 
 July 24, 2026
 
 
 Trustindex verifies that the original source of the review is Google. I recently had my windows replaced by Modern Construction Group, Inc., and I couldn’t be happier with the results. The difference the new windows have made is incredible. We chose windows with sound protection, and the reduction in outside noise and it has exceeded my expectations. (We live next to the Elementary School)

The installation team did an outstanding job. They were professional, worked efficiently, and kept the work area clean and organized throughout the entire project.

Gary was also excellent to work with. He stayed in constant communication, kept me informed every step of the way, and made sure I understood the process from start to finish. His attention to detail and follow-up gave me complete confidence throughout the project.

Another major improvement is the energy efficiency. The new windows have made a tremendous difference in keeping our house cooler, and our air conditioner doesn’t have to run nearly as much as it used to.

Overall, I am extremely satisfied with both the installation and the way Modern Construction Group handled the entire project. I would highly recommend them to anyone looking for high-quality windows and exceptional customer service.
  
 
      Posted on Google  
   
   Jen C 
 June 15, 2026
 
 
 Trustindex verifies that the original source of the review is Google. We couldn't be happier with the work completed by Gary and his team at Modern Construction Group. They converted a window into a sliding glass door and replaced our old window-and-slider combination with a beautiful three-panel slider, completely transforming the space.

From the very beginning, their communication was excellent. Gary took the time to answer all of our questions and helped us choose the right options for our home. The proposal was detailed and easy to understand, and the team kept us informed throughout every stage of the project. Everyone we worked with was professional, knowledgeable, and respectful of our home.

The craftsmanship and attention to detail were outstanding, and the final result exceeded our expectations. The room feels brighter, more open, and much more connected to our backyard. We constantly receive compliments from family and friends who see the space, and it truly feels like it was always meant to be this way.

We are so glad we chose Modern Construction Group and would confidently recommend them to friends, family, and anyone considering a home improvement project. We wouldn't hesitate to work with Gary and his team again.
  
 
      Posted on Google  
   
   Britton Miller 
 June 11, 2026
 
 
 Trustindex verifies that the original source of the review is Google. We recently had Modern Construction Group replace 18 windows in our home, install a new patio door, convert one window into a Dutch door, and close up another adjacent window—and the results were outstanding! Everything looks seamless, as if it was part of the original construction.

From the initial quote through final payment, communication was consistently prompt, professional, and polite. They took the time to answer all of our questions and made sure they understood exactly what we wanted before moving forward.

Gary, who managed the project, was exceptional. He was organized, responsive, and clearly cared about the quality of the work. There was a hiccup with the Dutch door that was initially provided, but Gary handled it masterfully—he went back to the manufacturer and had it replaced quickly and without hassle. That level of accountability made a big difference. He also held a high bar for craftsmanship, even asking workers to redo items that weren’t perfectly executed the first time.

All of the subcontractors were efficient, courteous, and respectful of our busy household (including kids and dogs). They worked seamlessly and made sure to clean up thoroughly at the end of each day.

You may notice in the photos that some areas around the new installations are not painted—this was our choice, as we decided to handle the painting ourselves to save on cost. That said, they did offer to include painting as part of the project and were happy to quote it.

Overall, this was a smooth, stress-free experience with high-quality results. I would highly recommend Modern Construction Group to anyone looking for reliable, detail-oriented professionals.

      EXCELLENT  
   Based on 17 reviews 
    
 
 
 
   
 
 
       Posted on Yelp  
   
   Jenny K. 
 June 26, 2026
 
 
 Verified Hands down, Modern Construction was the most professional contractor we worked with throughout our renovation.

We recently purchased a 1935 Tudor in East Sacramento that had extensive dry rot, termite damage, and several broken windows. Gary came out to provide a quote and immediately stood out for his sincerity, honesty, and genuine care for our home. He took the time to explain exactly what needed to be done, walked us through the financial aspects, and presented several options that fit our budget.

Although we received multiple bids, we ultimately chose Modern Construction because we felt confident they truly cared about the quality of their work--and they exceeded every expectation.

From start to finish, every member of the crew demonstrated exceptional attention to detail, professionalism, honesty, and respect. Renovating an older home came with its fair share of unexpected challenges, but Gary and his team guided us through every step of the process with patience and expertise.

What impressed me most was Gary's communication. Not once did I have a question or concern that went unanswered. He was always responsive, professional, and willing to help before, during, and after the project.

We couldn't be happier with the results and are incredibly grateful for the care Modern Construction put into restoring our home. We will absolutely be using them again for future projects and highly recommend them to anyone looking for a contractor who truly takes pride in their work.
  
 
      Posted on Yelp  
   
   Jerry S. 
 March 1, 2025
 
 
 Verified Gary and his team are amazing. They replaced our sliding patio door with French doors. The detailed workmanship was outstanding. Gary goes out of his way to make you feel like a valued customer and makes sure you are absolutely satisfied with the results. I highly recommend them.
  
 
      Posted on Yelp  
   
   Laura B. 
 December 22, 2024
 
 
 Verified We've remodeled our house a little bit at a time, so we have worked with a lot of contractors. Communication is not typically their strength, but Gary is super responsive. We had somewhat unique ideas about our siding, and Gary found exactly what we wanted. He and his team were always professional, and did quality work, and they got it done quickly without cutting corners. We are super happy with the results. Even after we paid, Gary sent his team to do final touches, and then Gary came himself. He also had our courtyard fence painted at no cost. I am so happy to not have that summer project! I will also add that he provided the most detailed quote, which I really appreciated. I highly recommend!
  
 
      Posted on Yelp  
   
   Bonnie G. 
 December 9, 2024
 
 
 Verified There aren't enough words to adequately express how wonderful Gary Chernyetsky & his team from Modern Construction are! The core of Gary's credo is to provide the highest quality of work & total customer satisfaction which he proved to us completely. We needed work on our three story house; paint, siding, dry rot work & new windows. We met with Gary one morning & by afternoon we received a quote that was all-encompassing which included detailed description of the scope of work with pictures, description of products to be used & price. His team was polite & extremely hard working from 8am to 5:30 pm six days a week. Work was never delayed because of another customer. We were always treated as a priority. Gary came out everyday to check on work & if we had any questions. If anything was not done to our satisfaction, Gary would see to it that it was changed - without any contention. They also did extra work that was not listed in the scope of work like extra molding or repairs because Gary believes in doing quality work, not what expedient for them. He always puts the customer first. Our house is beautifully done thanks to Modern Construction. Plus Gary will come back six months later to see if all the work is still to our satisfaction!  Modern Construction is a rare company that fulfills their promises, goes above & beyond to please the customer & takes pride in providing the highest quality of work. We can state without reservation that Modern Construction is THE VERY BEST!
  
 
      Posted on Yelp  
   
   Craig D. 
 September 28, 2024
 
 
 Verified I worked with Modern Construction for painting and stucco work and so much more, too many things to list here. Gary was fantastic to work with, he was always there to meet in person, understood what we needed and made the process very smooth. As the remodeling progressed new items were found and they were able to take care of it all. The pricing was reasonable and the end result fantastic. The property looked great. I'd highly recommend them.
  
 
      Posted on Yelp  
   
   Tom C. 
 August 30, 2024
 
 
 Verified Gary and his team came through and I am very pleased with the results. It all started with a detailed proposal that spelled out the work, leaving no doubt the big stuff was covered. On day one, a crew of four showed up on time to take care of the demo and install windows. After the rough in inspection, the team did a wonderful job installing the siding and trim pieces. Gary and I communicated throughout the project, for the work and to setup inspections. Coming from a retired project manager, I was pleased that it all came off like clock work and there were no surprises on this job (as often experienced by many others).  I would definitely hire MCG again on a future project.
  
 
      Posted on Yelp  
   
   Jordan H. 
 August 1, 2024
 
 
 Verified We had a wonderful experience with Gary and his team in replacing our siding, windows, and insulation. We had heard about them from other people we knew, and when making the final decision, we saw the incredible reviews all over for Modern, helping us solidify our decision (thank you Yelp!). Gary was prompt, courteous, and professional from the first estimate through the completion of the project. He responded to questions about the estimate and final questions before making the decision, and communication is a big thing for us. The team who actually completed the project had all the same positive attributes.

Perhaps the most amazing part was that the team stayed on the promised schedule, even with a holiday and the heat being above 110 every day they were working on the project. They showed up on time every day to make sure the project was done.

In addition to the heat, there was an issue with the windows being delayed in arriving from the manufacturer. Gary advocated for us to do all he could to get us the windows as quickly as possible (originally they were going to be 3 days late, but after he spoke with the powers that be, he got it bumped down to only 1 day late). One window even got delivered to the wrong place, and he did what he could to track it down and get it to us as soon as he could.

We also had to address some electrical tasks during this project, some of which were very much intertwined with the work Gary was doing, and Gary worked well in coordinating with our electrician.

Lastly, when the project was essentially done and Gary did the walkthrough, he kept his same work ethic and attention to detail. Throughout the project he was very interested in the big picture of the final project. During the walkthrough, he addressed everything we wanted fixed, no matter how small, and even found some items he added to his list that we did not notice, wanting to make sure nothing was left undone.

For big projects like this, you want the job done well and someone easy to work with, which is what Gary and his team offer. We would easily do other work with him, and give more stars if possible.
  
 
      Posted on Yelp  
   
   Kristy L. 
 June 3, 2024
 
 
 Verified We recently had a master bath remodel done with Modern Construction Group. the entire process was so perfect! The team checked in with us on suggestion and confirmed we were always on the same page. They went above and beyond to make sure we were happy and completed what we had discussed. Our Master bathroom and walk in closet turned out better than I could imagine! They also installed three windows for us and it has made our room look so much bigger. Thank you Gary, Paul, and team we are so happy and highly recommend this company for any remodel that you may need.
  
 
      Posted on Yelp  
   
   David L. 
 May 30, 2024
 
 
 Verified We used Gary and Modern Construction Group for a full bathroom remodel and added a walk in closet and windows in our bedroom. I would highly recommend Modern Construction Group. From start to finish this project was seamless. During the quoting process Gary and Paul were very knowledgeable and suggested different and fresh ideas that we hadn't really thought of, and we said to ourselves yeah that's a great idea or suggestion. We got a number of different quotes and hands down Gary and Modern Construction provided the best overall and most comprehensive quote. Gary, Paul and the crew kept the bathroom remodel on schedule, they communicated perfectly to ensure that everything was followed based on the contract. All in all the bathroom remodel turned out absolutely amazing and we love it. When we are ready to do our other bathroom remodel we will be calling Gary and Modern Construction Group.
  
 
      Posted on Yelp  
   
   Chris R. 
 March 23, 2024
 
 
 Verified I had Modern Construction Group replace two of my exterior doors. Gary and crew were fantastic.

One of the most important things for me when selecting contractors (outside of quality of work) is communication and speed of communication. I was incredibly happy with responses and open communication I received with Gary.

Gary's crew did a wonderful job on my door replacements and trim.

I believe I got a reasonably fair price for the effort.

I'll definitely use them for further work on my home in the future.