Know that stock windows save money and time, while custom windows fit any opening and last longer in older homes, so the right pick depends on your home’s age, openings, and budget.
Picking new windows in Upstate SC is not always easy. Folks in Greenville, Spartanburg, and Anderson ask us this same thing every week. Stock or custom window? The wrong fit leaks air and runs your AC harder than it should. This guide on What to Know About Custom vs. Stock Window Installation walks you through the real differences, the cost, and which one fits your home best.
Key Takeaways
- Stock windows cost $400 to $700 installed; custom runs $700 to $1,500+.
- Stock ships in 1 to 3 weeks, custom takes 4 to 8 weeks.
- Pre-1980 Upstate SC homes almost always need custom-sized windows.
- A tight custom fit cuts AC bills more than any glass upgrade.
- Custom windows return 70 to 75% at resale; stock returns about 65%.
What Are Stock Windows?
Stock windows come in fixed sizes that sit on the shelf, ready to ship.
You can grab them at most window shops or any big-box store nearby. Manufacturing plants make thousands of the same window at once, which keeps the cost low. A stock window fits well in newer homes with standard size openings. Most homes built after 2000 in Greer, Mauldin, and Simpsonville use these without trouble. Retail brands like Renewal by Andersen also sell stock and custom-made windows under one roof.
Common window sizes you will see on the shelf:
- 24 x 36 inches (small bedroom or bath)
- 36 x 48 inches (living room standard)
- 36 x 60 inches (large bedroom or kitchen)
- 24 x 60 inches (tall narrow openings)
You still get double pane glass, vinyl frames, a solid sash, and a real warranty.
What Are Custom Windows?
Custom windows match your exact size, shape, color, and glass after you place the order.
The factory makes nothing ahead of time. Window manufacturers build your replacement window from scratch. Older Anderson and downtown Greenville homes often need them since the openings rarely match factory sizes. Major window brands and leading window makers offer custom lines for this reason.
Here is what makes a window count as custom:
- Custom size: Width and height down to the eighth of an inch
- Size and shape: Arched, round, or any non-standard cut
- Frame: Vinyl, aluminum, or wood in 10+ colors
- Glass package: Low-E, argon gas, triple pane, or tinted
- Grids: Colonial, prairie, or custom layouts
- Type: Single-hung window, double-hung windows, casement windows, sliding window, or hurricane windows
Custom home windows also fit renovation jobs where the wall and drywall no longer match the original opening.
Custom Windows vs. Stock: Side-by-Side
Stock costs less and ships faster, while custom fits better and offers more style picks, making custom the smarter pick for older or odd-sized homes.
Here is how the two stack up:
| Feature | Stock Window | Custom Window |
| Cost (installed) | $400 to $700 | $700 to $1,500+ |
| Lead time | 1 to 3 weeks | 4 to 8 weeks |
| Fit | Standard openings | Any size and shape |
| Glass options | Few | Many |
| Color choices | 2 to 4 | 10+ inside and out |
| Warranty | Solid | Often longer |
| Best for | Newer homes | Older or higher-end homes |
The biggest gap in this windows vs matchup is the fit. Stock works great when your openings match. Custom is the only smart pick when they do not. Companies like Window World and Renewal by Andersen carry both lines.
How Much Do Custom Windows Cost in Upstate SC?
Stock windows cost $400 to $700 each installed, while custom windows run $700 to $1,500 or more in Upstate SC.
So how much do custom windows cost more? Usually 30% to 80% per window, based on size and options. Here is a quick look by type of window:
| Window Type | Stock (Installed) | Custom (Installed) |
| Double-hung windows | $450 to $650 | $700 to $1,200 |
| Casement windows | $500 to $750 | $800 to $1,400 |
| Sliding window | $400 to $600 | $650 to $1,100 |
| Single-hung window | $400 to $550 | $650 to $1,000 |
| Picture window | $500 to $800 | $900 to $1,600 |
| Bay or bow | N/A | $2,500 to $5,500 |
Things that affect custom window costs:
- Glass upgrades: $50 to $150 per window
- Black or bronze window frame: $75 to $200
- Grids between glass: $40 to $100
- Storm windows or hurricane windows: $200 to $500 extra
- Aluminum or vinyl frame swap: $100 to $300
How Long Does Each One Take to Install?
Stock windows take 1 to 3 weeks from order to install. Custom windows take 4 to 8 weeks.
Once the windows arrive, the install moves quickly. Spring rains in Upstate SC from March to May push install days back. Order early if you want windows in before summer hits.
Install day timeline:
- Per window: 30 to 60 minutes
- Small job (3 to 5 windows): Half a day
- Average home (10 to 15 windows): 1 to 2 days
- Large home or bay windows: 2 to 3 days
Which One Is Right for Your Home?
Stock fits most newer homes with standard openings, while custom fits older homes or homes with special design needs.
When Stock Windows Make Sense
Pick stock if:
- Your home was built after 2000
- Openings hit standard size (24×36, 36×48, 36×60)
- You have a tight budget
- You need windows fast
The stock window still comes with strong warranties and good glass. The Window Source of Upstate SC stocks the most common sizes for fast turnaround.
When Custom Windows Are Worth It
Go custom if:
- Your openings are odd or non-standard
- You want black frames, grids, or aluminum windows
- Your home leans higher-end
- You plan to stay 10+ years
Custom window solutions pay off long-term. The tighter fit cuts your power bill year after year and lifts curb appeal. Many of our buyers pick this route after reading cws windows reviews and seeing what custom can do.
Older Homes in Greenville and Spartanburg
Most homes built before 1980 in the Upstate need custom windows.
Old mill houses around Spartanburg, ranches in Anderson, and bungalows near downtown Greenville rarely have standard openings. Builders cut openings by hand back then. Two windows in the same bedroom can sit at different sizes. A stock window in an odd rough opening leaves gaps that crews fill with foam, which lets in drafts and moisture. Downtown Greenville also has historic district rules that often need custom windows designed to match the original look.
Energy Efficiency: Does Custom Win?
Both can be energy efficient, but custom usually wins on fit and glass options.
Upstate SC summers stay above 90° from June through September. Your AC fights to hold the inside temperature steady. The benefits of custom windows show up in the seal. A custom window matches your opening tighter than a stock one with shims around it.
Look for these on any window you buy:
- ENERGY STAR rating for the Southeast climate zone
- Low-E glass coating to block UV and heat
- Argon gas fill between panes
- U-factor of 0.30 or lower
Less air leaks out, your AC runs less, and your bill drops faster. Single-pane windows lose 4x more heat than double pane, so any upgrade helps. Read more at ENERGY STAR’s window page. Brands like cws impact windows also depend on a tight install to hit their ratings.
Common Mistakes Homeowners Make
The biggest mistake is picking stock just to save money when your openings do not match.
Slip-ups our crews see most often in Upstate SC:
- Forcing a stock window into an odd opening to save $200 today, then losing $50 a month on AC bills
- Waiting too long to order custom-made windows during busy spring and fall seasons
- Skipping the in-home measure
- Picking the wrong glass package for the SC heat
- Hiring the cheapest installer, who can ruin even the best pane windows
- Forgetting that a poor install messes with window blind fits and forces extra drywall and wall patching
Check custom window systems reviews before you sign with anyone. Our team at The Window Source of Upstate SC can help you avoid these.
Get the Right Windows for Your Upstate SC Home
The right pick depends on your openings, your budget, and how long you plan to stay.
After reading What to Know About Custom vs. Stock Window Installation, the next step is a real measure. The Window Source of Upstate SC measures every opening for free and tells you straight up which type fits best. We serve Greenville, Spartanburg, Anderson, and the rest of the Upstate. We handle Awning and Casement service, Sliding Window service, and full home renovation work. Contact Us today to book your free in-home measure and quote.
FAQs
Are custom windows worth the extra money?
Yes, if your openings are odd or you plan to stay long-term. The tighter seal cuts energy bills, and the wider style picks raise home value. For standard window openings in newer homes, stock works fine.
Can I mix custom and stock windows in the same house?
You can. Many Upstate SC owners pick stock for bedrooms with standard openings and custom for the front of the house. The mix saves cash without hurting the look.
Do stock windows look cheaper than custom?
Not always. A good brand of stock looks just as clean. The look gap only shows up with black frames, special grids, or odd shapes, where custom window sizes pull ahead.
How do I know if my openings are standard size?
Measure the rough opening, not the glass. Common sizes run 24×36, 36×48, and 36×60 inches. If yours fall within an eighth of an inch, stock works.
Will custom windows raise my home’s value more than stock?
Usually yes. Custom returns about 70% to 75% at resale. Stock returns around 65%. See cws windows prices for current rates.