If you’re shopping for replacement windows and have come across Slocomb Windows, you might wonder whether this regional manufacturer offers good value for your home. Slocomb isn’t as widely known as ProVia or Simonton, but they’ve been quietly building a loyal following for over four decades — and there’s a good reason for that.
This 2025 Slocomb Windows Review will give you everything you need to know about pricing, performance, efficiency ratings, warranty coverage, and how they stack up against competitors.
🏆 Quick Verdict
Slocomb Windows are a solid, made-in-the-USA vinyl window option for homeowners in the Mid-Atlantic and Northeast. However you should not ignore the risk of working with a small manufacturer like this.
They offer dependable performance, ENERGY STAR efficiency, and a fair price point. While not luxury-grade, their 677 Series provides one of the best cost-to-value ratios in the region. In my opinion there is no need to take a gamble on a company like this as they don’t offer anything that is really unique.
Best for: Homeowners looking for a dependable, affordable vinyl replacement window.
Not ideal for: Those who want premium finishes or nationwide availability.
Slocomb Windows 2025 Ratings
| Category | Score (out of 100) |
|---|---|
| Quality | 78 |
| Efficiency | 82 |
| Options | 75 |
| Warranty | 85 |
| Price | 91 |
| Overall | 82 (Grade B-) |
About Slocomb Windows
Slocomb Windows & Doors, headquartered in Pennsylvania, has been manufacturing vinyl windows for more than 40 years. The company focuses on energy-efficient designs and custom-sized replacement windows.
They serve a mostly regional customer base — primarily in the Mid-Atlantic and Northeast U.S. — but have grown steadily thanks to solid quality and reliable service.
Their product lineup includes:
- Slocomb 177 Series – Entry-level, budget-friendly replacement windows
- Slocomb 557 Series – Mid-range option with improved glass and frame efficiency
- Slocomb 677 Series – Premium model with better insulation and hardware upgrades
Build Quality: 78/100
Slocomb’s construction quality is respectable for its price point. Each window features fusion-welded vinyl frames for strength and rigidity. In higher-end models like the 677 Series, you’ll also find foam-enhanced frames for better thermal insulation.
Notable features include:
- Stainless steel constant-force balances for smooth operation
- Sloped sills for water drainage
- Interlocking meeting rails to improve air tightness
- Dual weatherstripping for enhanced performance
While Slocomb doesn’t match top-tier brands like Soft-Lite or ProVia, it’s reliable and easy to maintain — ideal for budget-conscious homeowners.
Energy Efficiency: 82/100
Energy efficiency is one of Slocomb’s strengths. With Low-E glass, argon gas-filled chambers, and warm-edge spacers, their windows perform on par with other mid-range vinyl options.
- U-Factors: As low as 0.27
- SHGC Values: Down to 0.20 (depending on glass package)
- ENERGY STAR 7.0 Certified: Yes, for most configurations
These ratings mean many Slocomb models qualify for the Federal Energy Efficient Home Improvement Credit (IRS 25C).
For more on energy performance, check out window efficiency ratings explained and our list of the best energy-efficient windows of 2025.
You can also explore official performance requirements on the ENERGY STAR website.
Design & Options: 75/100
Slocomb offers a modest range of design choices. You’ll find standard colors like white, almond, and clay, plus interior woodgrain finishes on select models.
Available styles include:
- Double-hung
- Casement
- Slider
- Awning
- Bay & Bow
- Garden windows
While customization options are limited compared to premium manufacturers like Marvin, the 677 Series still offers enough variety for most homeowners seeking traditional or modern looks.
Warranty: 85/100
Slocomb provides a Limited Lifetime Warranty that covers:
- Vinyl frame and sash materials
- Hardware components
- Insulated glass seal failures
The warranty is transferable once — a nice feature if you plan to sell your home.
Glass breakage coverage may not be included on all models, so confirm with your dealer.
For more detail on how this compares, see our guide to replacement window warranties explained.
Price: 91/100
Slocomb offers one of the best price-to-performance ratios in the mid-market category.
Here’s what you can expect for installed pricing in 2025:
| Window Type | Typical Installed Cost |
|---|---|
| Double-Hung | $800 – $1,150 |
| Slider | $775 – $925 |
| Casement | $800 – $1,050 |
| Bay/Bow | $2,500 – $4,500 |
Pricing will vary based on glass upgrades, region, and installer labor rates.
If you’re comparing bids, check out our guide to window sales tactics to avoid to make sure you’re getting a fair deal.
Slocomb vs. Competitors
| Brand | Strengths | Weaknesses |
|---|---|---|
| Slocomb | Affordable, ENERGY STAR certified, U.S.-made | Limited design options, smaller dealer base |
| Simonton | Excellent warranty, national availability | Slightly higher prices |
| ProVia | Premium quality and glass options | Higher cost |
| Wincore | Competitive efficiency and cost | Smaller distribution network |
| Polaris | Top efficiency and durability | Harder to source |
| Alside | Budget-friendly, wide dealer access | Quality varies by series |
👉 See our detailed reviews of Wincore Windows and Polaris Windows for more side-by-side context.
Common Slocomb Window Complaints
Most homeowner reviews are positive, but common feedback includes:
- Limited availability outside core regions
- Longer lead times for custom colors
- Occasional seal failures in older models
These issues are not unique to Slocomb — they’re typical of smaller, regional manufacturers.
To avoid headaches, always work with an authorized installer and verify their workmanship warranty.
🗨️ Share Your Experience
💬 Have you installed Slocomb Windows?
We’d love to hear your experience. Comment below or email us — we update our reviews regularly based on verified homeowner feedback.
Your real-world input helps us keep our ratings accurate and transparent.
The Window Dog’s Expert Take 🐾
“Slocomb might not be the most famous brand, but they’re quietly dependable. The big is comes from their being a much smaller company than their competitors. Their windows are sturdy, energy-efficient, and affordable — exactly what most homeowners need. The 677 Series in particular performs better than you’d expect for the price. If you’re looking for good value and made-in-America construction, Slocomb deserves a closer look.”
Frequently Asked Questions About Slocomb Windows
Are Slocomb windows good quality?
Yes. They’re a solid, mid-range vinyl window option known for reliability, energy performance, and fair pricing.
Where are Slocomb windows made?
Slocomb manufactures all of its products in Pennsylvania, USA.
Do Slocomb windows qualify for the 2025 energy tax credit?
Yes, most models meeting ENERGY STAR 7.0 standards qualify for the Federal Energy Efficient Home Improvement Credit (IRS 25C).
What is the warranty on Slocomb windows?
A Limited Lifetime Warranty covers vinyl, glass seals, and hardware, and can be transferred once to a new homeowner.
How much do Slocomb windows cost in 2025?
Installed pricing typically runs $500–$850 per window, depending on the model, glass package, and installer.
Are Slocomb windows ENERGY STAR certified?
Yes. The 557 and 677 Series both meet ENERGY STAR 7.0 efficiency requirements for most U.S. regions.
Who sells Slocomb windows?
They’re available through authorized independent dealers in the Mid-Atlantic and Northeast.
How do Slocomb windows compare to Andersen or Pella?
They’re less expensive, made from vinyl instead of fiberglass or wood, and better suited for value-focused homeowners rather than those seeking premium architectural style.
Looking for a Great Window Company?
Before signing with any contractor, check our curated list of the best replacement window companies across the country — featuring reliable, no-pressure pros who offer fair, transparent pricing.
Final Thoughts
Slocomb Windows may not have the marketing muscle of national brands, but they deliver where it matters: durability, energy efficiency, and affordability.
For homeowners in the Mid-Atlantic and Northeast, Slocomb offers dependable performance at a price that’s tough to beat.
If you’re shopping for vinyl replacement windows made in the USA, Slocomb Windows deserve a spot on your shortlist.
The .22 u-factor is on a double pane window not a triple pane. There is not a double pane window out there with that low of a rating.
Hi Rob, that is a very low rating if it’s for a double pane window. What do you think they’re doing differently than other companies to get a rating like that?
I find it interesting that you say Slocomb is a minor character in the industry. They may not be as large as others but Leon Slocomb was a pioneer in the vinyl window manufacturing. He holds 27 patents on vinyl windows and their technology is top notch. Their use of silver as a low E film is pivotal in their rating. They do not make a triple pane window. Most companies use foam as an insulator and that turns to powder over time and falls to the base.
You’re saying you think they make their own low-e coating? That seems unlikely to me but it would be interesting. Do you have any more info on that? I would guess they’re buying low-e glass from the national glass companies like everyone else. If that’s not the case I’d love to learn more about it. Do you sell Slocomb windows?
How do Champion windows compare to Slocomb? is the sales and installation company you allude to “Install America”? I won’t tell.
Ha, I do tend to always suggest working with larger manufacturers to get more stability. What is attracting you to those two manufacturers? It’s interesting to hear how people navigate this process.
Champion is offering buy 2 get 2 free. Install America says their windows are comparable to Anderson.
That sort of buy 2 get 2 free promotion is basically never a good deal in my experience. It’s just designed to make the phone ring. The price is likely still higher than you’ll find elsewhere. Have you gotten a quote already? I might be able to get you something to compare.
In my opinion, Andersen makes nice wood windows for new construction. If that’s the type of project you have in mind that might be a good choice, but otherwise there might be better options.
I have to be honest after reading this article, seems like there’s an extreme bias towards Slocomb windows. Is that because this website is actually owned amd operated by the owner of Window Universe? Of course you would be bias towards other windows because you want everyone to believe your windows are superior. You don’t even have all of your information correct. That’s double pane glass with a 0.22 u-factor, and their triple pane is even lower(0.15). The top of the line models are some of the best vinyl windows in the industry, and I would compare them to the Okna 800 and Vytex Potomac. All the bells and whistles. Please stop trying to bash other good windows, so you can influence people to buy yours. Do you still sell the Alside windows at your company? Let’s talk about how mediocre those windows are. What type of spacer system are you using in your Alside windows? Stainless steel intercept? Slocomb uses Duralite spacers just so you know. Stop with your nonsense.
Hi Kenny, thanks for taking the time to write. My company doesn’t sell many Alside windows but I believe they offer at least 3 different types of spacers.
You can see in the comments above that I asked another person who sounded like they sold Slocomb windows about what they think is happening to achieve a better rating for double pane than another company but I did’t get a reply. That always makes me a little suspicious of the claims salespeople make.
It might not surprise you to hear that sometimes the claims salespeople are taught in training class don’t turn out to be actually true.
Someone else wrote in seeming to imply that Slocomb makes their own low-e coatings which I don’t think is true, but it would be interesting if it was.
I’d also be interested to know if they have efficiency ratings with and without the fiberglass insulation. Since it sounds like you sell Slocomb windows do you have any insight to share on any of that?
Slocomb definitely doesn’t make their own glass. The lower end model doesn’t have fiberglass insulation and has a lower u-factor. How much lower without fiberglass insulation? I’m not too sure but if I had to guess, it’s probably only a small difference, like possibly 0.01-0.02 overall. Just like upgrading from a metal spacer to a non-metal spacer. Every little bit counts. To say fiberglass insulation inside of a frame doesn’t do anything at all seems kind of silly. If it didn’t do anything, why would it be used in windows, around windows, inside of walls of the home, and attics? There’s several ways to get a lower u-factor, and I know you already know this. The use of different low-e coatings and also the type of gas being used. Technology is constantly evolving, it’s 2024.
Well, there are lots of things that happen in this business just for sales and marketing purposes rather than to actually improve anything. The thinking is fiberglass insulation is used in attics to create dead air spaces in the fiberglass to reduce air flow and improve efficiency. Inside of a vinyl window frame there is no air movement so additional insulation doesn’t do too much. I think you’re probably right about a 0.01 or 0.02 difference in U-factor, and it certainly could be 0.00. I’ve seen that from other manufacturers when they do have actual data available.
We have reached out to Slocomb to try to make sure we have accurate info, but they haven’t responded. I am skeptical of the info salespeople send in. not because they’re knowingly lying, but because the training that in-home salespeople receive is often not 100% based in reality. That means a lot of people out there are claiming to be experts and making claims aren’t necessarily based in reality. The comment above from the person who wrote in claiming Slocomb had special glass is a good example of that. The person who wrote probably believed that to be true, but it’s probably not true. I’d bet he learned that in sales training class.
Anyway, feel free to chime in about anything. We may not agree on everything, but that’s ok and it is always the goal to have accurate info.
My above comment, I meant to say that the lower end model doesn’t have fiberglass insulation, and has a slighly “HIGHER” u-factor. I appreciate your response.
Hello,
I work for a contractor that offers Slocomb windows as an option. Their 677 model is in fact a 0.22 U-factor for double pane, 0.18 for triple pane (which they do make).
As for the fiberglass insulation, I always assumed it was for noise reduction more than a reduction in air flow.
Thanks for the info. Do you know if Slocomb publishes STC ratings to see the sound transmission levels?
Sorry, I don’t know anything about the STC ratings.
I find the author of this article to be biased against all the smaller window manufacturing companies. I take no stock in it or these reviews. I bet no one knows the difference between PVC And Vinyl. Google it and learn something . The major window companies use Vinyl . It’s very flexible and can be ripped apart by hand . A vinyl window can not support a window air conditioned of any style. They do not have the tensile strength to support winds up to 50 mph. As to the fiberglass insulation vs foam insulation inside the rail and beams. Do the research as I did. I won’t mention the names, but I found 6 companies that use slices of styrofoam,not expansion foam .These are a Fire hazard. The.cheap nylon begins melting at 265 degrees and then ignites the Styrofoam,which emits CYANIDE GAS. YOU’LL BE DEAD IN 20 seconds. Pumped in expansion foam, disintegrates after 5-7 years and becomes like bread crumbs.As the forn fitting foam begins to cure, it shrinks and leaves a sizeable gap and allows increased temperature fluctuations to cause the convection of heat or cold. Insulation doesn’t expand or contract. Fibrex. Do you know what it is ? You know those pre-made fire logs ?.Fibrex is compacted with just a few more foot pounds of pressure. Over time, the exposure to direct sunlight, water and snow will warp the frames and rails. Fibrex was once used as porch and deck wood . The folks that right the BOCA Codes had it listed as very dangerous Severe burns from waking on the porch or touching a park bench. PVC has increased tensile strength , has superior thermal properties to lower the transfer of invested heat or cold. As to the U C rating .0.22 to 0.25 equates to an R Factor of 5.4. A 0 27 equates to an R factor of 3.2. The lower number of the UC RATING, the more insulating Qualities.An argon does not and is not installed in sheets . It’s an inert gas that is infused in a container as the dual glass panes are sandwiched together. The bigger the company, the lesser quality in workmanship and customer service .Ask where they have their windows made or just compare the zip codes. Then Google these companies and sit back and kick yourself . These smaller companies make their windows for Anderson, Pella,Window World and Castle Windows. Ask to review the patents. I sure do.
Hi Daniel, thanks for taking the time to write. Sounds like you may have just finished up sales training and you may have learned some questionable info.
For example, vinyl windows are used in hurricane zones with wind ratings well over 100mph. PVC is poly vinyl chloride and PVC is a type of vinyl. Buildings with vinyl windows have caught fire, as have buildings with every type of windows, and people aren’t dropping dead from cyanide poisoning in 20 seconds. That’s the first time I’ve heard that one and it is entertaining.
Fibrex is the same material as fire logs? That’s also a fun one. I wonder if the fine folks at Duraflame would confirm that info. If you have anything to support that claim I’d love to hear it.
Finally, you think small manufacturers make windows for Andersen and Pella? For all of the things you could criticize them for, I don’t think that’s one of them. It feels like someone has sold you on some of these ideas. Window World and Castle are different in that they do not make windows.
My real question is, are you telling your prospective customers these things? And, who told you this info was true? You might want to question things they tell you in the future.