"For I know the plans I have for you," declares the Lord, "plans to prosper you and not to harm you, plans to give you hope and a future."
- Jeremiah 29:11
Your air conditioner ran all night and your electric bill still looks like a mortgage payment. Sound familiar? If you live in Midland, TX, you already know what West Texas summer does to a home with aging windows. Heat pours through old single-pane glass, rooms stay stuffy no matter how low you set the thermostat, and that dusty rattle every time the wind picks up tells you the seals gave up long ago.
Replacing your windows is one of the smartest upgrades you can make to a Midland home. But here's where most homeowners run into trouble before the job even starts: wrong measurements. Order a window a quarter-inch too wide and it won't fit. Order it a quarter-inch too narrow and you're looking at drafts, water intrusion, and a failed installation that costs more to fix than it did to mess up in the first place.
At The Window Source of West Texas, we help homeowners across Midland and West Texas eliminate guesswork by following a proven measuring process designed specifically for West Texas homes and conditions.
This guide explains exactly how to measure your windows correctly before ordering replacements.
In Midland, window measurement accuracy is more critical than in many other regions. The Window Source of West Texas frequently sees measurement issues caused by shifting soil and aging home construction, especially in older Midland neighborhoods.
West Texas homes face conditions that are genuinely punishing: summer temperatures that regularly hit 100°F or above, intense UV radiation, blowing caliche dust, and wind-driven debris. Your replacement windows have to seal perfectly to do their job. A gap of even 1/4 inch around the frame means warm air pouring in, your AC working overtime, and energy savings that never materialize.
There's also a structural reality specific to this region. Many Midland homes were built during the oil boom years of the 1960s, 70s, and 80s. West Texas soil, particularly the expansive clay found throughout the Permian Basin shifts seasonally as it absorbs and loses moisture. That shifting puts stress on foundations and frames over decades. Windows that were perfectly square when installed may no longer be. If you don't account for that when you measure, your replacement order will be wrong before it ships.
Accurate measurement isn't just about making the window fit. It's about making sure the investment you're making in comfort and energy efficiency actually delivers.
Before you touch a single window, gather the right tools. Using the wrong measuring tool is one of the most common reasons homeowners end up with incorrect measurements.
One important note: never trust a measurement you took more than a few days ago without re-checking. Window frames in West Texas homes can shift noticeably between dry and wet periods. Measure close to when you plan to order.
There are two types of window replacement: insert replacement (also called a pocket installation) and full-frame replacement. The steps below apply to both, but we'll note where the approach differs. If you're not sure which type you need, don't skip Section 4 it matters.
Open the window and measure the width of the opening at three horizontal points: at the top of the opening, in the middle, and at the bottom. Measure from the inside of the jamb on the left to the inside of the jamb on the right not from the trim or casing.
Write down all three numbers. For your order, always use the smallest of the three measurements. This is critical.
Why measure in three places? Because frames that look square almost never are, especially in homes on West Texas clay soils. The frame may be slightly wider at the bottom than the top, or slightly bowed in the center. Using only one measurement and hitting a bad spot means your window either won't go in or will have a gap.
Now measure the height of the opening at three vertical points: along the left side, down the center, and along the right side. Measure from the sill (the flat surface at the bottom) up to the underside of the top jamb again, not from the trim.
Record all three. Use the smallest measurement as your height dimension for ordering.
For insert replacements specifically, your window manufacturer will typically subtract a small amount (often 1/4 inch on each side) to allow for shimming and installation. Your window company will walk you through how their specific product accounts for this but the raw measurement you provide should always reflect what you actually see in the opening.
This step is skipped by most homeowners and causes more installation headaches than almost anything else, particularly in older Midland homes.
To check whether your window opening is square, measure diagonally from the top-left corner of the opening to the bottom-right corner. Then measure from the top-right corner to the bottom-left corner. Write both numbers down.
If both diagonal measurements are identical (or within 1/8 inch of each other), your opening is square. If they differ by more than 1/4 inch, the opening is racked meaning it's not a true rectangle. This is common in Midland-area homes that have experienced soil movement.
A racked opening doesn't disqualify you from replacement windows, but it does affect the approach. Your installer needs to know this upfront so they can plan for shimming and adjustments. If you're ordering windows yourself, note the diagonal measurements and share them with your supplier.
The jamb depth is the thickness of the window frame from the inside face to the outside face of your wall. Measure from the interior stop (the small strip of wood that the window closes against) to the exterior stop on the other side.
Why does this matter? Replacement windows need to fit within the existing frame. Most standard jamb depths run between 3¼” and 4¾”. If your home has exterior stucco which is common on Midland homes from the 70s and 80s your effective jamb depth may be different than expected. Stucco adds thickness to the exterior wall that can affect how an insert window seats.
If your jamb depth is less than 3¼”, an insert replacement may not be the right option. You may be looking at a full-frame replacement instead.
Before you close your notebook or put your phone down, take one full pass to re-measure everything you just recorded. Measurement errors that could have been caught in two minutes become expensive mistakes once windows are ordered and delivered.
Do not assume all your windows are the same size, even if they look identical from across the room. In Midland homes especially those built in multiple phases or those that have had previous repairs window openings vary more than you'd expect. Measure every single window you plan to replace, individually.
Understanding the difference between these two approaches will save you time, money, and the frustration of getting partway through a project and realizing you ordered the wrong thing.
An insert replacement installs a new window unit into the existing frame without removing the exterior trim, casing, or siding. It's faster, less invasive, and typically less expensive because you're not tearing into walls.
Insert replacements work well when:
A full-frame replacement removes the entire existing window assembly frame, trim, and all right down to the rough opening in the wall. New framing, flashing, and a new window unit go in from scratch.
Full-frame is the right call for many Midland homes, particularly those built during the oil boom decades. Here's why:
If you're not sure which type you need, that's exactly what a professional in-home assessment is for. A reputable Midland window company will evaluate your existing frames, not just quote you on window units.
These are the errors that show up most often in window replacement projects and all of them are avoidable.
This is the most common mistake. The rough opening is the structural opening in the wall. The glass is just one component of the window unit sitting in that opening. When you measure for replacement, you need the frame-to-frame dimensions of the opening itself, not the size of the pane of glass currently installed.
Measuring width once at the center and calling it done. Windows that have been in place for 20-40 years in West Texas clay-soil conditions are almost never perfectly consistent from top to bottom or side to side. Measure in three places. Always.
You have eight windows in your living room and hallway that look the same. They probably aren't. Even new construction can vary slightly. Older Midland homes that have been repaired or renovated over the years will almost certainly have variations. Measure each one.
If the opening isn't square and you don't know it, you'll end up with a window that either binds in the frame, gaps at a corner, or can't be properly sealed. Checking diagonals takes 90 seconds. Do it.
Homes with stucco or fiber cement siding have exterior wall conditions that affect how a replacement window fits and seals. If your home has these features, mention them when you're working with a window company. It changes the installation approach.
Homeowners who are comfortable with a tape measure can absolutely handle the measurement process for straightforward insert replacements. But there are situations where professional measurement is the smarter call:
Getting a professional measurement costs you nothing when you work with a reputable local installer. At The Window Source of West Texas, we come to your Midland home, assess every window you're considering, and give you accurate measurements alongside a transparent quote so you know exactly what you're ordering and why.
We've replaced windows on Midland homes across a range of construction eras and styles. We understand how West Texas soil movement affects older frames. We know the stucco situations, the aluminum-frame legacy builds, and the wind-driven dust infiltration that plagues homes that weren't sealed properly the first time. There's no guesswork in our process.
Measuring windows for replacement in a Midland, TX home isn't complicated but it does require patience, the right tools, and an understanding of what makes West Texas homes different from homes in the rest of the country.
Take your measurements in three places for both width and height. Use the smallest number. Check your diagonals. Note your jamb depth. Write everything down and double-check before you order. And if anything looks off frames that are visibly damaged, openings that are significantly out of square, or installation conditions you're not certain about getting a professional set of eyes on it before you commit to an order.
At The Window Source of West Texas, we serve homeowners throughout West Texas, Midland, Odessa, Big Spring, Andrews, and beyond. We offer free in-home measurements and no-pressure estimates so you can move forward with confidence, not guesswork.
Ready to get started? Contact The Window Source of West Texas today to schedule your free in-home window assessment.
Always three: at the top, in the middle, and at the bottom of the opening. Use the smallest of the three measurements when ordering.
If the window is too large, it physically won't fit in the opening. If it's too small, gaps will allow air, dust, and moisture to infiltrate and you'll lose the energy efficiency benefits you were replacing the windows for. Most manufacturers won't accept returns on custom-sized windows, so accuracy before ordering is essential.
Neither. You measure the rough opening, the structural opening in the wall that holds the entire window assembly. Measure from the inside face of the jamb on each side (left to right for width) and from the sill to the top jamb (for height). The glass and existing frame are already inside that opening.
Yes, in most cases. Windows that are slightly out of square can still be replaced; the installer uses shims and adjusted installation techniques to create a proper fit and seal. However, if the opening is significantly racked, a full-frame replacement may be needed to reframe the opening before the new window goes in. Always share your diagonal measurements with your window company so they can plan accordingly.
If your existing frame is structurally solid, reasonably square, and has enough depth to accommodate a modern window unit, insert replacement is likely the right choice. If there is rot, significant damage, severe racking, or the original frame is a thin aluminum single-pane unit from the 1970s or 80s, full-frame replacement is almost certainly the better option. A professional in-home assessment will tell you definitively.
Most single-family home window replacement projects in the Midland area are completed in one day. Homes with a large number of windows or those requiring full-frame replacements may take two days. Your window company should give you a clear timeline before the project begins.
