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Home/Guides/Buying guideBuying guide · 8 min read

# Blinds and shutters for awkward and shaped windows
Arches, apex gables, triangles, portholes, sloped ceilings, deep stone reveals — every one of them needs a template cut in your house, not a size picked off a chart. Here is how we approach the windows that catalogues cannot cover.

The short version

- Shaped windows cannot be measured from a chart — each one needs a physical template or laser survey cut to the actual opening.
- Shutters, not blinds, are the practical answer for arches, apex windows, circles and portholes; a fixed louvre lower frame with a shaped, often fixed, panel above is the standard build.
- Loft and sloped-ceiling windows need either genuine roof-window blinds with side channels or shutters built to sit flush on a raked reveal — a flat blind hung on a slope will always sag away from the glass.
- Stairwell and high-level windows raise access and safety questions before design questions; we plan the fitting method at survey, not on the day.
- Bespoke shaped work costs more than a standard opening of the same area, because every panel is templated and cut individually rather than batch-produced to a stock size.Free home survey 

Every job we quote starts as a standard window until it does not. A gable end with a triangle of glass above the main frame. An arched fanlight over a Victorian front door. A circular window in a stairwell landing that nobody has ever been able to dress. A loft conversion with three roof lights on different pitches. These windows are common across Greater Manchester, Lancashire and the Pennine villages we cover, particularly in the barn conversions, mill workers' cottages and 1930s semis with their distinctive gable features, and yet almost none of them can be solved with a product picked from an online size chart.

The reason is simple: a shaped or awkward window has no single measurement that describes it. A rectangle needs a width and a drop. An arch needs the springline height, the radius, and whether the curve is a true semicircle or a shallower segment. A gable triangle needs three sides and two internal angles, and if any of those are out by a few millimetres the finished shutter either will not fit the reveal or will fit with a visible gap along one edge. This guide covers the shapes we see most often, what actually solves each one, and why the survey and template stage matters more here than on any standard window in the house.

## Why off-the-shelf never works on a shaped window
Standard blinds and shutters are manufactured to a grid of stock widths and drops, cut down slightly to fit your exact rectangle. That system depends entirely on the window being a rectangle. The moment a window has a curved top, an angled top, a circular frame or a sloped plane, there is no stock size to cut down from, because the shape itself varies from house to house even when two windows look similar from the pavement.

We have measured two arched fanlights on the same terraced row in Rochdale that differed by 15mm in radius and had different springline heights, because one had been re-pointed at some point and the other had not. Order a generic 'arch blind' online against a guessed radius and at best you get a visible gap around the curve; at worst the unit does not go in at all and you are paying for a second attempt.

This is why every shaped or awkward window in our quotes gets a physical template or a full laser survey before anything is ordered, and why we will not quote a shaped opening from photographs or customer-supplied measurements alone.

## Arches, fanlights and gable apex windows
The most common request we get for shaped glazing is an arched or part-arched window above a front door, and the apex triangle at the top of a gable wall in barn conversions and newer executive homes. Both are almost always solved with shutters rather than blinds, because a soft fabric blind has nothing to hang from along a curved or angled top edge, while a rigid shutter frame can be built to follow it exactly.

The standard approach is a two-part build: a full-height or half-height section below with normal operable louvres that tilt open and shut in the usual way, and a shaped panel above — following the arch or the apex — that is usually fixed in place rather than operable. Fixed does not mean blank; the shaped upper section still carries louvres or a solid infill panel, it simply does not open, because the geometry of a curved or triangular frame makes a moving louvre mechanism impractical and, on tight radii, impossible to build reliably.

For a full arch (no straight sides at all, a complete semicircle or ellipse), the whole shutter is typically fixed, since there is no vertical frame member to hinge from. In that case we discuss with you at survey whether you want the arch to open at all, or whether it is there purely for light control and appearance, with the practical opening handled by a window below it.

- —Part-arch or Georgian-style arch over a rectangular window: operable panel below, fixed shaped panel above.
- —Full semicircular or elliptical arch: usually built as one fixed unit.
- —Apex gable triangle: fixed shaped shutter following the roofline, matched to the horizontal shutters below it.

## Circles, portholes and other pure geometric shapes
Circular and oval 'porthole' windows turn up in stairwells, bathrooms and the occasional feature gable, and they are the shape most people assume is impossible to cover. It is not, but it is always a bespoke fixed shutter or a fixed fabric panel rather than anything with moving parts. A circular frame has no straight edge to hang a track from, so roller and vertical mechanisms are ruled out immediately, and a circular louvre shutter, while technically buildable, is a specialist and expensive undertaking that we only recommend where the window is a genuine architectural centrepiece.

For most portholes, particularly in stairwells where the window exists for light rather than as a view, we template the exact circle or oval and build a fixed shutter panel — solid or louvred — that clips or is screwed into the reveal. It gives privacy and a finished look without pretending the window needs to open and close daily, which in a stairwell it rarely does.

## Loft conversions and sloped-ceiling windows
Roof windows on a sloped ceiling are a different problem again: not an unusual shape, but an unusual plane. Gravity works against any covering here — a standard flat blind hung from the top of a sloped roof light will sag away from the glass under its own weight, leaving light gaps at the sides and a covering that looks perpetually crooked. Genuine roof-window blinds solve this with side channels that the fabric or slats run inside for their full length, holding the covering flat against the glass at any pitch.

Shutters can also be built for sloped reveals, and we do this in loft conversions where the client wants the room to match shuttered windows elsewhere in the house rather than mixing in a roller-style roof blind. The frame is built to the actual pitch of the reveal, templated on site, since roof pitches vary even across roof lights on the same elevation of the same house.

We cover this shape in more depth, including model identification and motorisation, in our separate Velux blinds guide — the short version here is: measure and fit to the actual slope, never assume a standard flat product will sit correctly on it.

## Tilt-and-turn, top-hung and deep stone reveals
Not every awkward window is an unusual shape — some are ordinary rectangles with awkward hardware or a deep, uneven reveal. Tilt-and-turn windows, common in newer builds and some renovated period properties, open inward on two axes, which means a blind or shutter fitted inside the reveal can foul the handle or the hinge when the window opens. We either fit clear of the swing (moving the fixing forward onto the face of the wall) or specify a Perfect Fit-style frame that clips to the opening sash itself, depending on how the client actually uses the window day to day.

Top-hung and awning-style casements have a similar issue at the top of the frame, where the hinge mechanism needs clearance. Deep stone reveals, typical in older Pennine cottages and mill conversions, bring a different challenge: the reveal can taper from front to back, be several inches out of square, or have a stone sill that is not level. A shutter frame built square to a tapered or out-of-plumb reveal will show a wedge-shaped gap on one side, so we scribe the frame to the actual stone on site rather than building it to a single measurement and hoping.

## Access and safety on stairwells and high windows
Stairwell windows, particularly the tall thin ones that run alongside a staircase in Victorian terraces, and high-level windows above stairs in newer houses, raise a question that has nothing to do with the covering itself: how does anyone reach it safely, both to fit it and to operate it afterwards? We plan the access method at the survey stage, not on the day of fitting, because a stairwell often needs a tower or a stepladder set up on a half-landing, which takes time and space to do safely.

For day-to-day use we favour solutions that do not require anyone to lean over a stair void repeatedly: fixed shaped panels where the window does not need regular opening, or a corded or motorised operation brought down to a reachable height where it does. We will always flag if a request (for example, a fully operable louvre shutter on a window only reachable from the top of a step-stool over an open stairwell) is a genuine safety concern rather than simply a design preference, and suggest the safer practical alternative.

## What bespoke shaped work costs
Shutters are priced at £250 per square metre fully fitted, and that rate applies to shaped panels as well as standard rectangles, though a shaped or fixed panel typically takes longer to template and manufacture than a same-sized rectangular one, which we account for in the itemised quote rather than folding into a single blended price. Arches, apex triangles and circular shutters are all quoted individually once we have the template, so you see exactly what the shaped element costs against the standard louvred sections either side of it.

Loft and roof-window blinds start from £95 fully fitted for a straightforward manual blind on a standard Velux size, rising with side channels, blackout specification or motorisation. Every quote, shaped or standard, follows the same process: a free in-home survey, laser measuring or a physical template for anything non-rectangular, and an itemised written quote handed to you on the day, with a 50% deposit and the balance on completion.

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Frequently asked

## Questions we get askedon the doorstep.

### Can you fit shutters to an arched window?
+Yes. We template the exact arch on site and build a shutter with an operable louvred section below (if there is a straight-sided lower part) and a shaped panel above, following the curve. A full semicircular arch with no straight sides is normally built as one fixed shaped panel rather than an opening one, because there is no frame member to hinge from.

### What do you do about a circular or porthole window?
+We template the exact circle or oval and build a fixed shutter panel, solid or louvred, to fit it. Circular windows are almost always fixed rather than operable, since there is no straight edge for a workable hinge or track, and in most stairwell and feature applications the window is not one that needs daily opening anyway.

### Will a normal blind fit a sloped Velux or loft window?
+Not properly. A flat blind hung on a sloped roof light sags away from the glass under gravity and leaves light gaps down the sides. Genuine roof-window blinds use side channels that hold the fabric flat against the glass on the slope, and shutters for sloped reveals are built to the actual pitch of the window, templated on site.

### Why can't I just order a shaped blind online to my own measurements?
+Because shaped windows vary house to house in ways a single width-and-drop measurement cannot capture — radius, springline height, internal angles, or the taper of a stone reveal. We have measured two apparently identical arches on the same street that differed by 15mm in radius. A template or laser survey removes that guesswork before anything is manufactured.

### How do you deal with a window in a stairwell you can't easily reach?
+We plan access at the survey stage, including how the fitters will reach the window safely and how you will operate it day to day once installed. For hard-to-reach stairwell windows we often recommend a fixed panel rather than an operable one, or bring the operation down to a safely reachable height, and we will always flag a genuine safety concern rather than fit something we think is unsafe to use.

### Does shaped or bespoke work cost more than a standard shutter?
+The rate is the same £250 per square metre fully fitted, but a shaped or fixed panel generally takes longer to template and build than a same-sized rectangle, and we itemise that difference on the quote so you know exactly what the shaped element costs.

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A family-run team crafting bespoke plantation shutters, blinds and window dressings for homes across Greater Manchester and Yorkshire.

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