When ordering custom blinds or shades, choosing the product is only part of the decision. You also need to decide how the window treatment will be mounted.
An inside mount places the blind or shade within the window recess. An outside mount installs it over the opening, usually on the trim or surrounding wall. Both approaches can look good and function well, but the right choice depends on the depth and shape of the window, the amount of light control you want, and the finished appearance you prefer.
Because custom window treatments depend on accurate measurements, it is worth making the mounting decision before the product is ordered. Randall’s offers professional blinds installation for homeowners who want the window measured and fitted as part of the process.
What Is an Inside Mount?
An inside mount positions the blind or shade within the window frame or recess.
This creates a fitted appearance because the window treatment sits inside the architectural opening rather than covering the surrounding trim.
Inside mounts are often chosen when homeowners want:
- A clean, built-in look
- Visible window trim
- A more minimal appearance
- Space around the window for other décor
- A treatment that sits close to the glass
The main requirement is sufficient depth inside the window recess for the selected product and mounting hardware.
What Is an Outside Mount?
An outside mount places the blind or shade on the wall or trim surrounding the window.
The treatment extends beyond the opening rather than fitting inside it.
Outside mounting can be useful when:
- The window frame is too shallow for an inside mount
- The opening is uneven
- You want to cover existing trim
- Greater light coverage is important
- You want the window to appear larger
- Hardware inside the recess would interfere with the treatment
Because the treatment overlaps the opening, an outside mount generally gives you more flexibility with placement.
Which Mount Has the Cleaner Look?
Inside mounts are often preferred when the goal is a streamlined, built-in appearance.
Because the blind sits within the recess, the window trim remains visible and the treatment takes up less space on the surrounding wall.
This can work especially well in rooms with attractive mouldings or windows that already have strong architectural detail.
An outside mount creates a more prominent treatment because it covers part of the wall or trim. That does not make it less attractive. In some rooms, the larger proportions actually make the window look more substantial.
The best visual choice depends on the window and the rest of the room.
Does Every Window Have Enough Depth for an Inside Mount?
No.
Different blinds and shades require different amounts of mounting depth.
A shallow window recess may not provide enough room for the headrail, brackets, or operating mechanism to sit properly inside the frame.
Handles, cranks, locks, and other window hardware can also interfere with the treatment.
Before choosing an inside mount, the available depth needs to be compared with the requirements of the specific product.
This is one reason professional measurement can be helpful when ordering custom blinds.
Which Mount Is Better for Blackout?
An outside mount can often provide better coverage around the edges of the window because the shade overlaps the opening.
With an inside-mounted shade, a small amount of space may need to remain between the fabric and the sides of the window so the treatment can operate correctly. Those gaps can allow some light into the room.
That does not mean every outside mount automatically produces complete darkness. Light control depends on the product, fabric, headrail, side coverage, and installation.
If room darkening is the main priority, Randall’s blackout blinds include solutions designed specifically for bedrooms, nurseries, and media rooms.
Can an Outside Mount Make a Window Look Larger?
Yes.
Mounting the treatment above and wider than the actual opening can make the window appear taller or broader.
This is useful when:
- The window feels small in relation to the wall
- You want more visual height
- The trim is narrow
- You want the window treatment to become a stronger design element
Mounting higher can also allow more of the glass to remain visible when the shade is raised, depending on the product.
This technique needs to be planned carefully so that the treatment still covers the window adequately when closed.
Does an Inside Mount Make a Room Look More Modern?
It can contribute to a clean, minimal appearance, which works well in many contemporary interiors.
Roller shades and other streamlined treatments often look particularly neat when they fit inside a deep, square window recess.
However, mounting style alone does not determine whether a room looks modern or traditional.
Fabric, colour, hardware, trim, window style, and the type of treatment all contribute to the finished appearance.
An outside-mounted roller shade can look just as modern when it is proportioned correctly.
Which Mount Is Better If You Want to Keep the Window Trim Visible?
Inside mount.
Because the treatment stays within the recess, the surrounding casing or trim remains exposed.
This can be important in homes with:
- Decorative wood trim
- Detailed mouldings
- Painted architectural casing
- Historic window details
If the trim is part of the room's design, covering it with an outside-mounted treatment may not be desirable.
On the other hand, if the trim is damaged, uneven, or visually distracting, an outside mount can help conceal it.
Which Mount Is Better for an Uneven Window?
Outside mounting is often easier when the window opening is noticeably out of square.
Inside-mounted treatments need to fit within the narrowest usable dimensions of the opening, which can create more visible gaps when the frame varies from top to bottom.
An outside-mounted treatment is not constrained by the interior dimensions in the same way because it covers the opening from the surrounding wall or trim.
Older homes can have window openings that are not perfectly square, so measuring at several points is important before choosing the mounting method.
Do Roller Shades Work With Both Inside and Outside Mounts?
Yes. Roller shades can often be installed either way, depending on the window and product.
An inside-mounted roller shade creates a clean, recessed appearance.
An outside-mounted roller shade can provide additional coverage around the window and may be useful when the recess is too shallow.
The fabric width, headrail dimensions, window hardware, and desired light control all need to be considered before making the final choice.
What About Roman Shades?
Roman shades can also be mounted inside or outside the window opening.
Inside-mounted Roman shades create a fitted, architectural look and allow the trim to remain visible.
Outside mounting can make the window appear taller and may provide more coverage around the sides.
The amount of fabric that stacks at the top should also be considered. Mounting the shade higher above the opening may allow more glass to remain exposed when the treatment is fully raised.
Randall’s Roman shades are available in custom configurations for different window styles.
Which Mount Is Better for Small Windows?
There is no automatic answer.
An inside mount can keep a small window looking neat and uncluttered.
An outside mount can make that same window appear larger by extending the treatment beyond the actual frame.
If the window is small but has attractive trim, an inside mount may be preferable. If it looks undersized on a large wall, an outside mount may create better proportions.
The surrounding wall space and furniture placement also influence the decision.
Which Mount Is Better for Large Windows?
Large windows can use either mounting style, but the scale makes accurate planning more important.
An inside mount may create a very clean look on large modern windows with deep frames.
An outside mount may be required if the recess cannot accommodate the hardware or if the treatment needs additional width to improve light control.
Large windows can also involve several blinds installed side by side. In that situation, the mounting position affects how evenly the treatments line up across the opening.
Can You Use Curtains With Inside-Mounted Blinds?
Yes, and this is one of the reasons homeowners sometimes prefer inside mounts.
Keeping the blind or shade inside the window recess leaves the surrounding wall available for curtain rods and drapery.
This creates a layered treatment where the blind handles privacy and light control while the curtains contribute softness and style.
An outside-mounted blind can also be layered with drapery, but the hardware needs more planning because both treatments occupy space around the window.
Which Mount Is Easier to Measure?
Outside mounts are generally more forgiving because the treatment is not required to fit within a precise recess.
Inside mounts require accurate width, height, and depth measurements.
Window openings are not always perfectly square, so measurements may need to be taken at multiple points.
The product manufacturer may also specify exactly which measurement should be used when there are slight variations.
When custom blinds are being ordered, it is better to follow the product's measurement requirements rather than rounding dimensions or assuming all parts of the window are identical.
What Obstacles Can Affect the Mounting Choice?
Several window details can influence whether an inside or outside mount is practical.
Check for:
- Window cranks
- Locks
- Handles
- Deep trim
- Shallow recesses
- Uneven frames
- Tile around the opening
- Nearby cabinets
- Door handles
- Furniture positioned close to the window
These details may seem minor until the blind is installed.
Identifying them during measurement prevents problems such as a shade hitting a handle or a headrail interfering with the window operation.
Does Mounting Style Affect Privacy?
It can.
An outside mount usually covers more area around the opening, which can reduce side gaps.
Inside mounts may leave small spaces between the treatment and the frame, depending on the product.
For most rooms, those gaps may not matter. For bedrooms, bathrooms, or street-facing windows, however, privacy requirements may influence the choice.
The fabric or slat configuration still plays a major role, so mounting style should be considered together with the treatment itself.
Should You Choose the Mount Before Ordering the Blinds?
Yes.
Inside and outside mounting often require different measurements, so the mounting method should be decided before the custom treatment is ordered.
A useful process is:
- Choose the type of blind or shade.
- Inspect the window depth and surrounding area.
- Decide whether inside or outside mounting is practical.
- Take the measurements required for that mounting method.
- Confirm the product specifications.
- Place the order.
Changing the mounting method after a custom blind has already been manufactured may create fitting problems.
Can Randall’s Help Decide Between Inside and Outside Mounting?
Yes. Mounting is part of the overall measuring and installation process for custom window treatments.
A professional can assess the window depth, frame condition, trim, hardware, and light-control requirements before deciding how the treatment should be fitted.
Randall’s window treatment services include consultation, measuring, ordering, and installation, which can be particularly useful when several windows or different treatment types are involved.
Final Thoughts
Inside and outside mounts can both produce a well-finished window treatment, but they solve different problems.
Choose an inside mount when you want a clean, fitted appearance and the window has enough depth to accommodate the treatment. Consider an outside mount when the recess is shallow, the frame is uneven, you want greater coverage, or you want to make the window appear larger.
The most important step is deciding on the mounting method before the blind is measured and ordered. With custom treatments, fit and installation are part of the design rather than an afterthought.
Plan your window-treatment project with Randall’s: