Measuring Window Recesses for a Perfect Fit

A beautifully dressed window begins long before the fabric is chosen. Measuring window recesses correctly determines whether a blind sits neatly within its opening, whether a voile falls gracefully clear of the sill, and whether the finished look feels considered rather than compromised. In homes across Estepona and Malaga, where windows can range from deeply set shutters to wide sliding doors, every opening deserves individual attention.

A recess measurement may appear straightforward, but walls are rarely perfectly square, plaster can vary from one side to the other, and handles, tiles and shutters all affect the available space. The right approach depends on the treatment you have chosen. A recess-fitted blind needs different allowances from curtains hung above and beyond the opening.

First, decide whether the treatment belongs inside or outside the recess

The recess is the space between the inside faces of a window opening: the width from one side wall to the other, the height from the top of the opening to the sill or floor, and the depth from front to back. It can provide a smart, architectural frame for a roller blind, Roman blind or plantation shutter. It can also be the starting point for curtains, even when the finished curtain track sits outside it.

For a blind fitted within the recess, the aim is a clean, contained finish. This works particularly well where the window itself is attractive, where shutters need to remain accessible, or where there is limited wall space above the opening. The trade-off is that even a well-fitted recess blind will allow a slim line of light at each side. If blackout is a priority in a bedroom, fitting outside the recess may be the better choice.

Curtains are usually installed beyond the recess rather than within it. Positioning the pole or track above the opening gives the room more height and allows the curtains to stack back clear of the glass. It also makes a window appear wider and brings a more generous, layered feel. For many living rooms, bedrooms and patio doors, this is the most elegant solution.

What you need before measuring window recesses

Use a reliable metal tape measure, not a fabric tape or a folding rule. A pencil, paper and a step stool are useful, especially for taller windows. Record every figure in centimetres or millimetres and make a simple sketch of each window as you go. Label the width, height and depth clearly, rather than relying on memory when several rooms are involved.

Measure each window separately, including windows that appear identical. This matters in older properties and renovated homes, but it is equally relevant in newer flats where plasterwork and tiling may create subtle differences. One centimetre can be the difference between a tailored finish and a blind that catches at the side.

Before taking any dimensions, look closely at the opening. Note inward-opening windows, tilt-and-turn mechanisms, protruding handles, security sensors, tiled returns, marble sills, radiators and existing shutters. These details are not obstacles to beautiful window dressing, but they do influence the fitting and the style of heading, track or blind that will work best.

How to measure a window recess accurately

Measure the width in three places

Take the horizontal width at the top, centre and bottom of the recess. Measure from the inside edge of one side to the inside edge of the other, keeping the tape level. Write down all three figures.

For a treatment that will sit inside the recess, the smallest width is normally the relevant one because the opening may narrow slightly at one point. Do not make your own deductions unless the supplier has specifically requested a finished blind size. Made-to-measure workrooms typically apply the correct clearance for the fitting system, ensuring the blind operates freely without leaving an unnecessarily large gap.

For curtains fitted outside the recess, these three measurements still reveal the true shape of the opening. They help determine where the track or pole should extend, usually beyond both sides of the window so that the curtains can frame the view rather than obscure it.

Measure the drop in three places

Measure from the top inside edge of the recess down to the sill at the left, centre and right. Again, record each measurement. If the blind is to finish within the recess, the shortest drop is generally used where the sill is uneven.

A window without a sill should be measured down to the floor or to the desired finishing point. This is where design judgement matters. A Roman blind may stop neatly at the base of the recess, while a roller blind can be positioned to cover more of the opening. For curtains, the preferred drop may be to the sill, below the sill, or almost to the floor. A refined floor-length curtain should usually sit just above the floor, although a more relaxed puddled finish can suit selected interiors.

Check the recess depth

Measure the depth from the front edge of the recess to the window frame, then check the deepest point too. Depth decides whether a blind can sit comfortably inside without interfering with handles, shutters or the movement of the window.

Roman blinds require more space when raised because the fabric gathers into a stack. Roller blinds and some Venetian styles may be more practical in a shallow recess, though the exact depth required varies by mechanism and fabric. If there is not enough room, an outside-recess fitting can look intentional and generous, especially when coordinated with curtains or voiles.

Details that can change the finished result

Window handles are one of the most common considerations. A blind may physically fit within the recess but still catch on a handle when lowered. Measure how far the handle projects and consider whether it turns, folds or moves as the window opens. The same care applies to window sensors, security fittings and trickle vents at the top of modern frames.

Spanish homes often bring additional features into the decision. Internal shutters may need full clearance, while wide terrace doors benefit from treatments that stack back without restricting access or blocking the light. Strong sunshine can make light control a priority, but that does not automatically mean a heavy fabric is required. A carefully chosen lining, a discreet blind behind curtains, or a softly filtering voile can create the right balance between privacy, comfort and the Mediterranean light.

Bay windows and shaped openings deserve a more considered approach. Measure every individual section, including the angles between them, rather than treating the bay as one broad window. Arched tops, sloping ceilings and uneven stone walls are best assessed in person, as the fitting solution can be as important as the measurement itself.

Recess fitting or outside-recess fitting: choosing with confidence

There is no single right answer. A recess-fitted blind offers a neat, compact appearance and suits rooms where minimalism or practicality leads the design. Outside-recess fitting gives greater coverage, can reduce side light, and often creates a more luxurious sense of proportion.

Layering can bring the best of both. A discreet recess blind manages daylight and privacy, while full-length curtains soften the room, improve acoustics and add warmth. In a principal bedroom, this combination offers both daytime elegance and more effective darkness at night. In a sitting room, sheer voiles inside the opening with curtains on a track above can preserve views while giving the space a beautifully finished presence.

The fabric and hardware should always influence the final decision. Heavier, lined curtains need a secure track or pole and sufficient stacking space. Delicate voiles need room to move without brushing a radiator or catching on a door handle. A measurement is not merely a number - it is part of the design plan.

When professional measuring makes the difference

Home measurements are helpful when you are considering options, but a professional survey is particularly valuable for made-to-measure curtains and more complex windows. It removes uncertainty around track position, fabric fullness, heading depth and floor clearance. It also means practical details are resolved before the fabric is made.

At Boutique Curtains, an in-home consultation considers the window within the whole room: furniture placement, sunlight, ceiling height, wall finishes and the way you use the space. This personal approach is especially reassuring for second-home owners and anyone coordinating a larger interior refresh from a distance.

Take your initial measurements carefully, but allow the finished window treatment to be guided by how you want the room to feel. The most successful choice is not simply the one that fits the recess. It is the one that gives your wonderful windows the proportion, softness and effortless elegance they deserve.