A picture window is a large, fixed pane of glass with no hinges, handle or locking mechanism. It does not open. That absence of moving parts is exactly why it is the cheapest window style per opening you can specify: a fitted uPVC picture window costs £220 to £440 in 2026, compared with £400 or more for an equivalent casement. Use the picture window calculator to price a full set in seconds.
What is a picture window?
The name comes from the idea of framing a view like a painting on a wall. Where a casement window has a sash that swings outward on hinges, a picture window is simply a pane of glass set into a fixed frame. There is nothing to operate, nothing to seal against the weather each time you close it, and nothing to oil or adjust over the years. The result is a very clean sightline and a very low unit cost.
Because the glass is fixed, the visible frame can be narrower than on an openable window: the frame only needs to hold the pane, not accommodate a hinge, handle or multipoint lock. Slim aluminium picture frames in particular can reduce the frame-to-glass ratio to almost nothing, which is why they appear so often in contemporary architecture where an uninterrupted wall of glass is the design goal.
Picture windows are sometimes called fixed lights or fixed panes, and the terms are interchangeable in the trade. A fixed light can also refer specifically to the non-opening panel within a mixed window assembly, for example a large fixed centre pane flanked by two opening side casements. That combination is extremely practical and the one most experienced installers recommend for living rooms and kitchens: the fixed area maximises the view while the opening panels provide ventilation.
The first thing I tell anyone asking about picture windows is that they are brilliant on the right wall, but you cannot put them in every opening and walk away. You need at least one casement in the same room, or the building inspector will not sign it off. Plan the ventilation before you plan the glazing.
Tom Bradley, FENSA-registered installer
Picture window costs in 2026
The price advantage over openable windows is real and consistent. Removing the mechanism cuts the cost of the unit itself and simplifies the installation: there is no hinge to set, no handle to fit and no lock to test after fitting. The table below covers the three main frame materials, fully fitted, including removal of the existing unit, supply, installation, sealing and the FENSA certificate.
| Material | Per window (fitted) | Notes |
|---|---|---|
| uPVC picture | £220–£440 | Cheapest style per opening |
| Aluminium picture | £300–£590 | Slim frames, large spans |
| Timber picture | £420–£840 | Period and listed homes |
Source: DGCC 2026 dataset, cross-checked against Checkatrade and StayWarm.
The uPVC figure of £220 to £440 represents the lower bound of what you will pay for any new double-glazed window in 2026. Size is the main variable within each material band: a small fixed fanlight above a door sits at the bottom of the range, while a floor-to-ceiling picture window spanning the width of a sitting room will sit toward the top. Glass specification adds a little to the cost (more on that below) but far less than the jump to any openable style.
Energy performance: the case for fixing the pane
A fixed pane has a thermal advantage that is easy to overlook. Understanding how U-values work reveals why: the measured U-value of a window is an average across the glass and the frame, but it is the edge seal on an openable window that is hardest to keep airtight over time. A picture window has no opening seal to degrade. The frame-to-glass joint is permanent and factory-made, so the U-value on the specification sheet is what you get in year one and in year fifteen.
This reliability makes a fixed pane an excellent candidate for upgrading to triple glazing. Our double versus triple glazing comparison shows that the step up to triple glazing is most worthwhile on large, fixed areas of glass, precisely because the fixed frame realises the full theoretical gain. On an openable window, a worn or slightly misaligned closing seal can erode a significant portion of the triple-glazing premium. On a picture window, that risk does not exist.
If you are targeting the lowest possible U-value on a tighter budget, you can also specify low-emissivity glass coatings, which add a microscopically thin metallic layer to the inner pane to reflect radiant heat back into the room. Low-e coatings are standard on most A-rated units today, and on a large, fixed picture window the coating earns its cost over every winter. Because the pane never moves, the coating is never stressed by the flex of opening and closing.
Building Regulations and ventilation
The one significant constraint on picture windows is ventilation. Approved Document F (Means of Ventilation) requires that habitable rooms have an openable area of at least one-twentieth of the floor area, or alternatively mechanical ventilation. A fixed window contributes nothing to this allowance. In practice, the simplest solution is to pair every run of picture windows with at least one adjacent casement window in the same room. The casement provides the required ventilation opening, and the picture window fills the rest of the wall with uninterrupted glass.
There is a second consideration for bedrooms. Approved Document B (Fire Safety) requires that an upper-floor bedroom has at least one openable window with an unobstructed clear opening of at least 0.33 m², with a minimum dimension of 450 mm in any direction and a bottom edge no more than 1,100 mm above floor level. A picture window provides none of this. Any bedroom on a first floor or above that is served only by fixed glazing will fail a Building Control inspection. The answer is a casement, sash or tilt- and-turn unit elsewhere in the same room.
None of this prevents picture windows being used generously. A large sitting room with a south-facing picture window and a single casement to one side is entirely compliant, very attractive and genuinely warmer in winter: the fixed expanse of glass captures solar gain without the draughts that accompany an imperfectly sealed opening unit.
I have fitted rooms with an entire wall of picture glass and a single casement in the corner, and they pass inspection every time. The trick is to treat the casement as the ventilation strategy, not an afterthought. Get that right and you can glaze as generously as you like.
Tom Bradley, FENSA-registered installer
Which homes suit picture windows?
Best Buy Picture windows suit any home where the priority is light, view or thermal simplicity. They are particularly well suited to modern and contemporary properties, rear extensions, garden rooms, and any room with a south- or west-facing aspect where capturing the sun matters. Because the frame material can be matched to the rest of the house (uPVC for most post-war housing, slim aluminium for new-build and contemporary work, timber for period or listed properties), they sit comfortably in a wide range of architectural styles.
On rear elevations, picture windows are especially practical. The back of a house is rarely subject to planning restrictions, so you can specify the largest fixed pane the wall can carry without needing consent. The saving over an equivalent run of casements is significant on a rear-extension project with several openings, and the cleaner look is a bonus.
When a picture window is the wrong choice
It depends On a front elevation in a conservation area, your local planning authority may require replacement windows to match the appearance of the originals, which could mean vertical sliding sashes or traditional casements with glazing bars. A large, unbroken picture pane is unlikely to pass a conservation area consent application on a Victorian terrace. If that describes your home, read the planning guidance before ordering.
Picture windows are also less suitable when you know you will want to air the room freely without opening the door, or when cross-ventilation matters on warm summer days. If you value the ability to control draughts and temperature by cracking a window open, an openable style will serve you better in day-to-day use. The right answer is usually the combination: one large fixed pane for light and views, one modest casement for air.
The verdict
If you want the most glazing for the least money, the picture window is the answer. At £220 to £440 fitted in uPVC, it undercuts every openable style, delivers a cleaner aesthetic and, when specified with a low-e coating or triple-glazed unit, performs very well thermally. The only things to plan carefully are the ventilation opening and, on upper floors, the means-of-escape casement. Get those right and a run of picture windows on a suitable wall is hard to beat for value and simplicity.
When you are ready to get a price, the picture window calculator gives you a 2026 cost range based on frame material and number of openings. The full guides index covers every window style and material if you are still weighing the options.
Frequently asked questions
A picture window is a large, fixed, non-opening pane of glass set in a frame. It has no hinges, handle or locking mechanism, which makes it the least expensive window style per opening. Because it does not open, any room fitted with picture windows only must have an opening window or another form of ventilation nearby to satisfy Building Regulations.
A fitted uPVC picture window costs £220 to £440 in 2026. Aluminium frames run £300 to £590, and timber frames £420 to £840. All figures include removal of the old unit, supply, fitting, sealing and the FENSA certificate.
A picture window can comply with Part L thermal requirements and Part K safety-glazing rules. The complication is Part F (ventilation) and Part B (means of escape): a fixed window provides neither. Any habitable room fitted with picture windows must have at least one openable window or trickle vent elsewhere, and a bedroom on an upper floor needs an openable window large enough to escape through in a fire.
Often yes. Because a picture window has no opening seal to degrade over time, it holds a low U-value more reliably than an equivalent casement. A fixed A-rated double-glazed pane or a triple-glazed unit can achieve a centre-pane U-value as low as 1.0 W/m²K or better, which is harder to sustain through an openable seal that wears with use.
In principle yes, but every room must have an opening window or mechanical ventilation to comply with Building Regulations. In a bedroom on an upper floor you also need a means-of-escape opening. The practical rule is straightforward: pair every run of picture windows with at least one adjacent casement in the same room.
The terms are used interchangeably by most installers. A fixed light often refers to a non-opening panel within a larger window assembly, such as a fixed centre pane flanked by two casements. A picture window usually implies a standalone, large-format pane designed to frame a view. Both are fixed glazing and are priced the same way.
Yes, and a fixed pane is an excellent candidate for triple glazing. Because there is no moving seal, the theoretical performance of the triple unit is fully realised in practice. If you are targeting the lowest possible U-value, specifying triple glazing on a picture window costs less than doing the same on an equivalent casement because the fixed frame is simpler to fabricate.