What Is Recess Size for Blinds? Meaning, Measuring & Uses
Definition
Recess size is the exact width and drop measured inside the window recess, from one wall surface to the opposite wall surface. It is used when a blind is fitted inside the window opening and allows the supplier or fitter to make the correct deductions for smooth operation.
What Does Recess Size Mean?
Recess size refers to the internal measurements of a window opening. This usually includes the full width across the recess and the full drop from the top of the recess to the sill or desired finishing point.
When ordering made-to-measure blinds, recess size tells the manufacturer that the blind needs to fit neatly within the window reveal. The finished blind will normally be made slightly smaller than the measurements supplied so it does not scrape the sides or sill.
Why Recess Size Matters
Accurate recess size measurements help ensure a blind sits cleanly inside the window opening. Even small measuring errors can affect how well the blind fits, operates and controls light.
- Ensures a neat fit: Helps the blind sit within the window recess without looking oversized.
- Allows fitting deductions: Gives the manufacturer room to adjust the finished blind size correctly.
- Improves operation: Reduces the risk of the blind rubbing against walls, tiles or handles.
- Supports light control: Helps minimise unnecessary side gaps when measured correctly.
- Creates a tidy finish: Keeps the blind contained within the window reveal for a built-in appearance.
Recess Size vs Exact Size
Recess size and exact size are often confused, but they are used for different fitting requirements. Choosing the correct option is important when ordering made-to-measure blinds.
| Measurement Type | What It Means | Best Used For | Who Makes Deductions? |
|---|---|---|---|
| Recess Size | The full internal width and drop of the window recess. | Blinds fitted inside the window opening. | The manufacturer or supplier usually makes the deductions. |
| Exact Size | The precise finished size you want the blind to be made to. | Blinds fitted outside the recess or where a specific finished size is required. | The customer or fitter allows for the final size. |
| Cloth Size | The width of the fabric only, excluding brackets or mechanisms. | Specialist replacement fabrics or very precise fitting needs. | The customer or fitter must account for hardware. |
How to Measure Recess Size
To measure recess size, take the width inside the recess at the top, middle and bottom. Then measure the drop on the left, centre and right side of the recess.
Use the smallest width and smallest drop when providing recess measurements. This helps account for window openings that are not perfectly square.
- Measure wall to wall inside the recess.
- Measure in millimetres for better accuracy.
- Check for handles, tiles, vents or inward-opening windows.
- Do not make your own deductions when ordering as recess size unless instructed.
- Make sure the recess depth is suitable for the blind type selected.
Types of Blinds Commonly Ordered as Recess Size
Many blind styles can be fitted inside a recess, provided there is enough depth for the headrail, brackets and operating controls.
| Blind Type | Recess Size Suitability | Key Consideration |
|---|---|---|
| Roller Blinds | Very common | Fabric may be narrower than the brackets, creating small side gaps. |
| Venetian Blinds | Very common | Needs enough depth for the headrail and slats to tilt freely. |
| Roman Blinds | Common | Fabric stack depth should be considered when the blind is raised. |
| Vertical Blinds | Common for larger windows | Track width and louvre clearance need careful measuring. |
| Pleated Blinds | Common | Often suited to neat, compact recess installations. |
Common Applications
Recess size is commonly used for blinds in bedrooms, living rooms, kitchens, bathrooms and home offices. It is especially useful where a clean, flush finish is preferred.
It is also popular when combining blinds with curtains, as the blind stays inside the recess while the curtains dress the outside of the window. This can improve both privacy and styling flexibility.
Child Safety and Recess Size
Recess size can affect where blind controls, chains or cords are positioned. Any blind with looped cords or chains must be installed with suitable safety devices and in line with UK child safety requirements.
Professional fitting should follow BS EN 13120, the European standard covering internal blinds and child safety. This is especially important in children’s bedrooms, nurseries and family spaces where control lengths and safety retainers must be correctly fitted.
Expert Tip from Homefair Blinds
Always measure the recess in several places and use the smallest measurement. Window openings are rarely perfectly square, and this simple step helps your made-to-measure blind fit and operate properly.
Frequently Asked Questions About Recess Size
Do I need to deduct anything from recess size?
No. If you are ordering using recess size, you normally provide the full internal measurements and the supplier makes the necessary manufacturing deductions.
Is recess size the same as inside recess?
Recess size is the measurement, while inside recess describes the fitting position. Both relate to blinds fitted within the window opening.
What happens if my recess is not square?
Use the smallest width and drop measurements. This helps prevent the finished blind from catching on narrower parts of the recess.
Can all blinds be fitted using recess size?
Most blind types can be fitted inside a recess, but the recess must have enough depth and clearance for the chosen blind style, brackets and controls.