Combining Timber Windows and French Doors in Home Design
Picture the back wall of a reception room. In the middle, a pair of French doors. On either side, a tall panel of glass running floor to ceiling. What you have stopped looking at as a doorway has quietly become a wall of light, and the garden beyond it reads less like something outside the house and more like a painting hung across the whole span of the room.
That is the real appeal of French doors with side windows. The doors themselves do the obvious job of letting you walk out onto the terrace.
The glazed panels on either side do the quieter, more transformative one: they pull daylight deep into the room, carry the view right across the wall, and let the whole opening scale up to suit the proportions of the space without the doors ever becoming heavy or awkward to swing.
A little vocabulary helps before we go further, because the trade has a name for everything. The fixed or opening glazed sections that flank the doors are sidelights (sometimes called side panels).
Glazing set above the doors, in a horizontal band, is a top light or transom. And the slim bars that divide a large pane into smaller ones, the detail that reads instantly as period, are astragals or Georgian bars. None of it is complicated once it has a label, and knowing the words makes designing the opening far easier.
What sets this apart from a standard pair of French doors is simply the amount of glass and how it is arranged. A plain pair gives you an opening the width of two doors. Add sidelights and you gain a run of glass on each side that stays fixed, or opens for extra air, while keeping that classic swinging, hinged look a sliding patio door can never quite give you.
What "Doors with Side Windows" Actually Means (and how it differs from patio doors)
Doors with side windows are usually called sidelight doors or side-panel doors: a central door, or a pair of doors, with fixed or opening glazed panels set into the frame on one or both sides. On French doors the panels sit flush with the doors as part of one continuous unit, so the whole opening reads as a single run of glass rather than a door with windows tacked on.
It is worth knowing how that compares with the two other ways people glaze a back wall. Bifold doors fold back in a concertina to clear almost the entire opening, which is dramatic but distinctly modern and leaves you with a row of frames stacked at one end.
Sliding patio doors glide sideways and give huge panes with slim frames, again very contemporary.
French doors with sidelights take a different route: the doors swing on hinges and keep a traditional look, while the side panels give you much of the extra glass bifolds get from their folding leaves, without borrowing the modern aesthetic.
Can you get French doors with windows? Yes, easily. Side panels and a top light are a standard made-to-measure configuration, not a special request, and a good joiner will build the doors and their flanking glass as one designed opening sized to your wall.
There are honest trade-offs. The main disadvantage of French doors is that they swing, into the room or out onto the terrace, so you need clearance on that arc and have to think about where furniture sits.
And because the whole opening is mostly glass, the glazing specification matters more than it would on a smaller window: you want it working hard for warmth and security, which we will come to.
Layouts and Configurations: Fixed Panels, Opening Panels and Top Lights
There are a handful of standard ways to arrange French doors with side windows, and the right one depends mostly on how wide your wall is and how much ventilation you want.
Fixed sidelights - glazed panels that do not open, flanking the doors. The simplest option, the most glass for the money, and the best sightlines.
Opening sidelights - side panels that open like casements, so you get cross-ventilation on a warm day without swinging the main doors wide.
French doors with a top light (transom) - a band of glazing above the doors, which lifts light higher up the wall and adds a sense of height to the room.
Full-height glazed flanks - sidelights running the full height of the opening, floor to ceiling, for the most dramatic wall of light on a wide reception wall.
Slim slot sidelights - narrow side panels for a tighter wall, where you still want the lift that flanking glass gives without the doors dominating a small room.
Choosing between them is really a question of your wall. A wide reception wall can carry full-height sidelights and will look generous for it. A narrower opening is better served by slim side panels that still lift the light without crowding the doors. Measure the clear width you have to play with before you fall in love with a layout.
Then think about swing. French doors can be hung to open inward or outward, and it changes how the room works.
Opening outward onto a terrace keeps the floor inside clear for furniture and is the usual choice where space is tight.
Opening inward can be useful where a path or planting sits right against the house, but it eats into the room, so plan where the sofa and the coffee table land before you commit.
One detail ties the whole thing together: match the glazing pattern across the doors and the side panels. If the doors have a particular bar arrangement, carry it across the sidelights too. Get that right and the opening reads as one considered design rather than a door that happens to have windows next to it.
Period and Conservation Homes: Georgian Bars, Victorian and Edwardian Proportions
On a period house, the glazing-bar pattern is the detail that makes or breaks the opening. The same French doors with sidelights can look original to a Victorian villa or hopelessly wrong, and the difference is almost entirely in how the glass is divided.
Georgian design favoured many small panes held in slim bars, the classic six-over-six arrangement, giving a delicate, gridded look. Victorian homes, once larger sheets of glass became affordable, moved to bigger panes with fewer bars, so the look is simpler and the glass more open.
Edwardian design kept some of that openness but often reintroduced a lighter decorative pattern in the upper panes, giving a softer, less formal feel. Carry whichever pattern your house calls for consistently across both the doors and the sidelights and the opening will sit comfortably in the wall.
Those slim dividing bars are the astragals or Georgian bars mentioned earlier: strips of timber (or, on cheaper products, a grid stuck to or sealed between the glass) that break a large pane into smaller ones for an authentic period look. On a well-made door they are part of the structure, and they are what gives a heritage opening its character.
A word of caution for anyone in a conservation area or a listed building. Like-for-like, period-appropriate joinery is usually the route planning officers prefer, but what is actually permitted varies enormously from one authority and one property to the next, and nobody online can tell you what yours will allow.
Check with your local planning authority before you commit, and use the official guidance as your starting point: the Planning Portal sets out the general position, and Historic England publishes detailed advice on windows, doors and energy efficiency in historic buildings.
Get the proportion and the pattern right within those rules, and you end up with French doors that look as though they were always there, rather than bolted on in the last decade.
Choosing the Material: Timber, uPVC or Aluminium
There is no single best material for exterior French doors, only the one that best fits your house, your budget and how much upkeep you are willing to do. Each of the three main options earns its place for different reasons, so it is worth weighing them honestly rather than taking a verdict on trust.
Timber is the natural choice for a period home and for anyone who cares how the opening looks up close. It gives warmth and character, and genuinely slim sightlines, so more of the opening is glass and less is frame. It can be repaired in part rather than replaced whole, a rotten section cut out and a new piece let in, which is far harder on a sealed plastic or metal frame.
As a material it is renewable, and a modern engineered timber like Accoya (softwood that has been chemically modified, or acetylated, to make it far more stable and resistant to rot) brings durability that competes with tropical hardwoods.
Accoya is rated Class 1 for durability, and its maker warrants it against rot for decades above ground. The honest caveat is that real timber needs looking after: expect to repaint or recoat it periodically to keep it protected and looking its best. That is manageable, not onerous, but it is real.
If character is what you are after, and especially on a period property, the route that gives you the look is bespoke, made-to-measure timber built to your opening. That is the point at which it pays to look at a specialist maker of real-timber French doors rather than an off-the-shelf unit, because the sidelights, the bar pattern and the proportions can all be drawn to suit the house.
uPVC is the low-upkeep, lower-cost option, and for a plain modern house it does the job. The trade-offs are that the frames and glazing bars are bulkier, so you lose some glass to frame, and the plastic reads as plastic up close in a way that sits awkwardly on a period home. It is also hard to repair sympathetically: a damaged section usually means replacing the unit.
Aluminium gives the slimmest frames of all and a crisp, contemporary look, which is exactly right for a modern extension. It is strong and low-maintenance. But metal conducts heat, so an aluminium frame needs a thermal break (an insulating barrier built into the frame) to avoid being cold and prone to condensation, and even at its best it reads as modern rather than traditional.
Whatever the frame, a large glazed opening benefits from good double glazing, which can improve both warmth and sound insulation compared with single glazing.
If your work is governed by Building Regulations, Part L sets the energy standards for new windows and doors, though historic buildings have specific allowances where meeting the standard would harm their character. Treat efficiency as something good glazing can improve, not a fixed figure to promise.
Styling the Opening: Curtains, Blinds, Flooring and the Flow Outside
A wall of glass is only as good as the way you dress and frame it, and a French-door-plus-sidelight opening rewards a bit of thought here.
For curtains, the trick is to hang them wide of the frame, on a pole that extends well past the glass on each side, so that when they are open they stack against the wall and leave the entire opening clear. That keeps the glass working and makes the window look wider and taller than it is. Where full-height curtains feel too soft or too fussy, slim blinds fitted to the individual panels give you privacy and light control without hiding the frames, and they suit a more pared-back room.
Flooring is where the indoor-outdoor magic actually happens. Run the same floor, or a sympathetic matching threshold, from inside the room out onto the terrace, and the eye reads the two spaces as one. A level threshold with no step helps enormously; the garden stops feeling like a separate place you go to and starts feeling like the far end of the room.
Keep the sidelight sills clear, or use them deliberately. A low sill is a natural shelf for a trailing plant, a small lamp or a single considered object that frames the view without blocking it. Resist the urge to crowd it.
Finally, colour. There is no rule that says the frames must be the same shade inside and out, and a dark or heritage colour outside with a softer tone indoors is a lovely way to let the opening recede into a bright room while reading as a crisp frame against the garden. Dress the opening for the season too: light, airy layers that let summer pour in, heavier curtains that hold the warmth on a dark winter evening.
Are French Doors Still in Style in 2026, and Are They Right for Your Home?
Yes, French doors are very much in style in 2026, and sidelights are a large part of why. The appetite for natural light, for a proper view of the garden and for traditional character has not faded, and flanking a pair of doors with glazed panels answers all three at once. It is a look that reads as timeless rather than of-the-moment, which is exactly what keeps it current.
Whether they are right for your home comes down to a few honest questions. Do you have the wall width to carry them, and the clearance for the doors to swing? Are you ready to specify the glazing properly, since a big glazed opening lives or dies on the quality of its glass?
And does the style suit the house, a period pattern for a period home, a cleaner contemporary look for a modern extension? If the answers line up, there is very little that transforms a room so completely for the footprint.
One practical note: French doors with side windows are almost always made to measure, built to the exact dimensions of your opening rather than bought off a shelf. That is simply the nature of fitting a run of glass to a specific wall, and it is part of what lets you get the proportion and the detail right.
Get it right and what you gain is not really a door at all. It is a room that feels bigger because it is full of light, a garden that has become part of daily life rather than something glimpsed through a small window, and a view you get to keep, framed, every day of the year.
Our writers like to blog about the latest interior trends. We launched the award-winning Seasons in Colour in 2015 and the luxury property and interior decor blog www.alltheprettyhomes.com in 2024 to cover all your interior design, travel and lifestyle inspiration needs.
