A bad window measurement can throw off the fit by inches where it matters most. If I want a smooth window treatment visit in a beach home, I need to write down six things for each opening: width, height, depth, trim notes, clearance, and shape details.
Here’s the short version:
- I measure every opening one by one, even if two look the same.
- I record width at top, middle, and bottom.
- I record height at left, center, and right.
- I write all numbers in inches, in width × height order, rounded to the nearest 1/8 in.
- I check inside depth, plus cranks, locks, handles, tile, and trim that may block mounting space.
- I note door swing, handle projection, and track clearance for sliders and French doors.
- I take photos of arches, angle-top windows, circles, and other non-rectangular shapes.
- I label each opening by room and location so nothing gets mixed up.
Beach homes often have big glass walls, patio doors, and shaped windows. They also deal with sun glare, salt air, and humidity, so fit matters. In many homes, even a 1/8-inch measuring difference can change how a treatment sits inside the frame or clears a door handle.
Before I book an appointment, I do one last check: every opening has measurements, mount notes, obstruction notes, and labeled photos. That way, the visit can stay focused on fit and product choices instead of missing field notes.
Window Measuring Checklist for Beach Homes: 3-Step Process
How to Measure a Window STEP by STEP!
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Step 1: Record Width and Height for Each Window
Measure each opening on its own, even when two windows look like twins. Small frame differences can throw off the fit. Start with width and height, then move to depth and mounting details.
Measuring at three points helps you spot frame unevenness before it turns into a fit problem.
Measure Width at Three Points
Measure inside the frame at three spots: top, center, and bottom. Write down each number to the nearest 1/8 in. For example: 35 1/2 in., 35 3/8 in., and 35 1/4 in.
For inside mounts, use the smallest width as the order width. Keep the other two numbers in your notes so the installer can see how much the frame shifts from top to bottom.
Measure Height at Three Points
Measure from the top inside edge down to the sill at three spots: left, center, and right. Record all three in inches.
For inside mounts, use the tallest height as your order height. That way, the full opening is covered.
Use this format for every opening:
| Field | Example Entry |
|---|---|
| Width – Top / Middle / Bottom | 35 1/2 in. / 35 3/8 in. / 35 1/4 in. |
| Order Width (inside mount) | 35 1/4 in. (smallest) |
| Height – Left / Center / Right | 62 in. / 62 1/8 in. / 62 1/4 in. |
| Order Height (inside mount) | 62 1/4 in. (tallest) |
Label Each Entry by Room and Location
Give each opening a clear label by room, wall, and window number. For example: Primary Bedroom – Ocean Wall – Window 1 or Living Room – Patio Door Wall – Window 2.
This makes it much easier to match each opening during the visit. You can also add notes like full sun, afternoon shade, or salt spray impacts.
Next, check depth and obstructions.
Step 2: Check Depth, Trim, and Mounting Space
Once you’ve recorded the width and height, the next job is to check each opening’s usable depth, trim, and mounting space.
Measure the Inside Depth of the Window Casing
Usable inside depth is the flat space from the interior casing face, or the drywall face if there’s no casing, to the first obstruction. Use a steel tape measure and record the depth to the nearest 1/8 in. using the proper measuring tools Take at least two measurements, left and right. For larger openings, add a center measurement too.
Write it like this: Left: 2 3/4 in. / Center: 2 5/8 in. / Right: 2 1/2 in.
If the sill slopes, make a note of the direction. Does it tilt toward the glass or toward the room? That small detail can matter later.
Note Trim, Cranks, Locks, and Other Obstructions
Coastal homes often come with impact-rated windows, deep decorative casings, and tile that runs right up to the frame edge. Any of those can cut into your mounting space, so check each opening closely and note what you see.
Example: Crank lower right – projects 1 1/4 in.
For every obstruction, mark whether it reduces usable mounting space: Yes / No.
A crank that folds flat is often fine. On the other hand, thick crown molding across the full top of the opening or continuous tile with no flat spot for brackets will often point you toward an outside mount.
Mark Inside Mount or Outside Mount Preference
Add a simple checkbox to each window entry: Inside / Outside / Unsure.
Inside mounts work well for deep frames and trim you want to leave visible. Outside mounts make more sense when depth is tight, the frame is out of square, or you want better light control and privacy.
Add a short reason, like prefer inside for clean look or outside to cover uneven trim. Confirm the final mount type during the consultation.
| Field | Example Entry |
|---|---|
| Inside Depth – Left / Center / Right | 2 3/4 in. / 2 5/8 in. / 2 1/2 in. |
| Sill / Casing Condition | Sloped toward room |
| Obstructions | Crank at lower right – 1 1/4 in. projection |
| Reduces Usable Space | Yes |
| Preferred Mount Type | Outside – limited depth |
| Photos Taken | Yes – labeled LR-2A |
After the depth and mount notes are done, move to door clearance and specialty shapes.
Step 3: Check Door Clearance and Specialty Shapes
Once you’ve measured width, height, and depth, move on to any opening that moves or changes shape. Doors and non-rectangular openings come last for a reason: clearance and shape affect fit, how the treatment works, and whether you’ll need an inside mount, outside mount, or something more custom.
Measure Clearance Around Patio and French Doors
Beach homes often have big openings that connect indoor living areas to patios, decks, or balconies. Choosing window coverings for large windows in coastal environments requires balancing views with UV protection. That open feel is great, but it can make window treatment planning a little tricky.
Start by opening and closing the door. Note the swing direction and the path people use to walk through it. Then measure from the trim or casing to the nearest obstruction, like a handle, lock, hinge, wall edge, or nearby furniture.
A few details matter here:
- For French doors, note how far each handle sticks out.
- For sliders, record which panel moves and where the treatment needs to clear the track.
- Measure enough space for the treatment to project, stack, or tilt without getting in the way of the door.
Those notes help confirm whether the opening can take an inside mount, an outside mount, or a low-profile custom treatment.
If the opening isn’t a plain rectangle, measure the shape next.
Identify Arches, Angles, Circles, and Other Specialty Shapes
Some openings need more than a standard width-and-height note. Specialty shapes can include arches, half-rounds, circles, ovals, angled tops, trapezoids, bay or bow units, and grouped windows.
Also watch for windows that look rectangular at first glance but have a decorative arch or curved section at the top or side. That kind of detail is easy to miss, and it can change how the treatment is measured and made.
Pay close attention to any opening that changes shape partway up. If a window starts as a rectangle and then curves near the top, call that out before the consultation.
Record Shape Details with Photos
Use the same room-and-location label on every photo and measurement entry. That keeps things from getting mixed up later.
For any specialty shape, measure:
- the widest point
- the tallest point
- where the curve or angle begins
If there’s a rectangular section below an arch, measure that part separately. In some cases, the lower section can take a standard treatment, while the arch above needs a separate custom piece.
Label each photo to match your room-and-location system, such as MB-W3-arch. Bring those photos and notes to the consultation so custom options can be matched faster.
| Field | Example Entry |
|---|---|
| Door Type | French door – dual active panels |
| Swing Direction | Both panels swing inward |
| Handle Projection | 1 3/4 in. from door face |
| Clearance to Nearest Wall | 6 in. on latch side |
| Specialty Shape | Half-round arch above slider |
| Widest Point of Arch | 48 in. |
| Tallest Point of Arch | 18 in. |
| Rectangular Section Below | 36 in. H – standard treatment possible |
| Photos Taken | Yes – labeled PD-1-arch, PD-1-door |
Final Checklist Review and Next Steps
Before you book the appointment, measure your windows for blinds and shades and run through the full checklist one more time. The goal is simple: confirm every opening using your finished measurements before scheduling.
Checklist Fields to Complete for Every Opening
Use one row per opening, group entries by room, and work through the home in a set order.
| Field | What to Record |
|---|---|
| Room Name | e.g., Living Room, Master Bedroom |
| Window Location | e.g., Ocean-facing wall, left of sliding door |
| Width (3 points) | Top, middle, bottom – use smallest for inside mount |
| Height (3 points) | Left, middle, right – use longest for inside mount |
| Inside Depth | Minimum usable depth of the casing |
| Mount Type | Inside Mount or Outside Mount |
| Trim Notes | Molding style, width, decorative casing |
| Obstruction Notes | Cranks, locks, sensors, handles |
| Door Clearance | Swing direction, handle projection, floor clearance |
| Shape Type | Rectangle, arch, circle, angle-top, etc. |
This setup makes it easier for the consultant to spot shallow-depth openings, repeated trim issues, and mount-type patterns fast.
Once every field is filled in, do one last pass for missing labels, photos, or out-of-square notes.
Key Points to Review Before Scheduling
Before scheduling, check the basics. Record every opening in inches as width × height, rounded to the nearest 1/8 in.
If an opening looks out of square, or if the readings don’t match closely, note that in the checklist. Also make sure every photo is labeled to match its checklist entry, such as Master Bedroom – Arch 1, and can be pulled up easily on your phone or tablet during the appointment.
With those notes ready, the consultation can focus on coastal durability and fit. You can also review our checklist for durable window treatments to prepare for material selection. Scheduling can then move straight to product and fit decisions.
FAQs
What tools do I need to measure windows accurately?
Use a sturdy steel tape measure with clear inch and fraction markings if you want the most accurate results. Skip fabric, plastic, or novelty tapes. They can stretch or just be less precise.
It also helps to keep a pencil and measurement worksheet nearby so you can write things down as you go. A carpenter’s square and level are handy for checking corners and mounting points. And for high or awkward windows, grab a step stool, ladder, or an optional laser measuring device.
How do I know if a window should be inside mount or outside mount?
An inside mount is the best pick if you want a clean, flush look and your window frame has enough depth. In most cases, that means 3/4 inch to 2 inches, depending on the product.
Go with an outside mount if the frame is shallow, has obstacles like cranks or locks, or isn’t square. A simple way to check: measure diagonally from corner to corner both ways. If those two numbers differ by more than 1/2 inch, an outside mount is the better choice.
What should I do if my window frame is uneven or out of square?
Measure both diagonals from corner to corner. If the difference is more than 1/2 inch, an inside mount can end up looking crooked. In that case, an outside mount is usually the better pick.
You should also measure the width and height at the top, middle, and bottom. That helps you spot any uneven spots before you install anything.
If the irregularities are small, shims or spacers can help you make the surface level. A Z-frame can also help cover uneven edges, which makes the final look a lot cleaner.
