Double Steel Internal Doors: Everything You Need to Know Before You Choose
There are few architectural statements within a home as considered as a pair of double steel internal doors. Where a single door defines an opening, a double door set defines a room. It brings symmetry, presence and a sense of occasion that changes the way a space feels — and the way you move through it.
At Joshua James, double doors are among our most specified configurations, appearing most often in entrance hallways, between kitchens and living rooms, and in any opening where the scale of the space demands something more than a single leaf. Getting them right rewards you every day. Getting them wrong is difficult to undo.
This guide covers everything you need to know before you choose.
Why Double Doors Work So Well in Steel
Steel is a particularly well-suited material for double door configurations. The slim sightlines of a steel frame mean that even a large double door set feels open and light — the glass dominates, the frame recedes, and the result is an opening that connects spaces rather than dividing them.
Timber and other materials struggle to achieve the same balance at scale. As door sizes increase, so do frame widths, which can make large openings feel heavy and enclosed. Steel holds its elegance regardless of scale, which is precisely why it is the material of choice for grand door sets in luxury homes.
Explore our full range of double door configurations in our Interior Collection.
Where Double Doors Work Best
Double doors are not simply a larger version of a single door. They bring a different quality to a space — one that is worth considering carefully before committing.
Entrance hallways. A grand double door set at the entrance to a principal room — a drawing room, a dining room, a kitchen — creates an arrival moment. It frames the space beyond and tells you, before you have even stepped through, that what lies ahead is considered and deliberate. This is one of the most common settings for our double door sets, and one where they consistently deliver the greatest impact.
Between kitchens and living rooms. Open-plan living has become a defining feature of luxury home design, but completely open spaces are not always desirable. A double door set between a kitchen and a living room offers the best of both worlds — the two spaces can breathe together when the doors are open, and be separated cleanly when they are closed. The symmetry of a double set suits this transition particularly well.
Any opening where scale demands it. Some openings are simply too wide for a single door to feel right. A double door set fills the opening properly, maintaining proportion and making the architecture feel resolved rather than compromised.
Browse our Double Doors page for further detail on configurations and sizing.
How Double Doors Work: The Detail Most People Miss
Understanding how a double door set actually operates is essential before you commit — and it is where some of the most important decisions are made.
Unlike a single door, a double set consists of two leaves: a main door and a secondary door. In everyday use, the main door is the one you open and close. The secondary door is held in position and brought into play only when the full width of the opening is needed.
There is no central post between the two leaves. The doors meet at the centre, and it is here that the construction detail becomes important.
The rebate. On our InoCross20 and InoCrossSCULPTURE systems, a rebate can be welded to the edge of the secondary door for the main door to close into. This creates a clean, defined meeting point between the two leaves and eliminates any visible gap. If preferred, these systems can also be produced without a rebate — in which case both doors can open and close interchangeably, though a small gap will be visible between them when closed.
On our InoCross20FR fire-rated system, two rebates are used — one on each door — so that the gap between the leaves is fully enclosed on both sides. On our InoCross50FR system, the rebate is formed by the shape of the profiles themselves, which close into one another. In both fire-rated cases, the main door must be opened first and closed last. This is not a quirk of design — it is a requirement of how the systems were tested and certified.
Securing the secondary door. The secondary door needs to be held firmly in position when not in use. On our InoCross20FR and InoCross50FR systems, shoot bolts are used — again, a requirement of the fire certification. On our InoCross20 and InoCrossSCULPTURE systems, the choice between shoot bolts and a magnetic hold close is guided by the handle specified. Lever handles — such as our Guarded handle — are paired with shoot bolts. Welded handles — such as our Trim handle — are paired with a magnetic hold close, which secures both the main and secondary door elegantly without the need for a separate bolt mechanism.
Does the secondary door need a handle? Not necessarily. Some clients choose to omit the handle on the secondary door entirely, for a cleaner aesthetic or a more deliberate design intent. It is a choice worth considering early, as it affects both the look of the door set and how the secondary leaf is operated day to day.
Visit our Hardware & Furniture page to explore the full range of handle options available.
The Question Almost Every Homeowner Leaves Too Late
Of all the decisions involved in specifying a double door set, one is consistently left until the end — and it is one of the most consequential: which door will be the main, and which will be the secondary?
It sounds straightforward. In practice, it shapes how you use the doors every single day.
The answer is almost always determined by the natural flow of the home. Which direction does traffic move most naturally through the opening? Which leaf are you instinctively drawn towards as you approach? These are not abstract questions — spend a moment standing in the opening and the answer usually becomes clear.
Swing path matters too. A door that opens into the path of furniture, an adjacent door, or a frequently used appliance will cause daily frustration regardless of how well it looks. Consider where each leaf will sit when fully open, and whether that position works with the room as it is actually used.
Once the main door is established, everything else follows — the handle placement, the rebate detail, the shoot bolt or hold close, and the way the door set reads from both sides of the opening. It is a decision that should be made early and with care, not resolved on installation day.
Which System Is Right for a Double Door Set?
All four of our systems are available as double doors, each with its own character and appropriate context.
InoCross20 is our signature system — fully welded, handcrafted from cold-rolled steel, with a 35mm door border and 15mm bars. It suits a wide range of interiors and is the natural starting point for most double door projects. Its slim sightlines and design flexibility make it equally at home in a period hallway and a contemporary kitchen extension.
InoCrossSCULPTURE takes slimness further still, with a 20mm door border and 20mm bars that maximise the glazed area and bring an ultra-contemporary quality to the opening. For homeowners who want the frame to recede and the glass to lead, this is the system to consider.
InoCross20FR delivers E30 fire-rated performance within a refined, architectural frame that closely mirrors the appearance of our InoCross20 system. Where fire separation is required between two spaces — most commonly between a kitchen and a hallway — it allows safety and design to coexist without compromise.
InoCross50FR is specified where a higher level of fire and smoke protection is required. Available across a range of ratings from E30 through to EI120, it is the system for projects where performance requirements are at their most demanding. Despite this, it retains the considered, premium aesthetic that every Joshua James door is built around.
Our Fire Doors & Screens page covers our fire-rated systems in further detail.
Design Considerations for Double Doors
A double door set offers considerable design freedom — bar layout, glass type, finish and ironmongery can all be tailored to suit the home and the vision behind it. A few considerations are worth keeping in mind as you work through the design.
Symmetry. Double doors are inherently symmetrical, and the design should usually reflect that. A bar layout that works across both leaves as a unified composition — rather than two single doors placed side by side — will feel resolved and intentional. Our Designs pages offer a useful reference for how different bar configurations translate across double door sets.
Glass. The glass you choose will define how the two spaces relate to one another when the doors are closed. Clear glass maintains a strong visual connection. Reeded glass softens and obscures. Frosted glass separates almost entirely. The right choice depends on how much separation you want — and how much you want to preserve. Explore the options on our Glass Types page.
Finish. A double door set covers more visual area than a single door, which means the finish carries more weight within the room. The same principles apply — RAL colour, texture, and how the finish sits alongside the other materials in the space — but the scale of a double set makes the decision more consequential. Our Finishes page covers everything available from Joshua James.
Seeing Double Doors in Person
A double door set is a significant addition to any home, and it is one that benefits enormously from being seen at scale before a decision is made. Proportions, sightlines and finish all read differently in person than they do on screen.
Our showroom gives you the opportunity to see our doors as they were designed to be experienced — in a real space, in real light, with the ability to operate them, feel the hardware, and understand how each system sits within an interior.
If you are considering a double door set for your home, we would encourage you to visit before you commit.
Starting Your Project
Every double door set we produce is made to order — bespoke to the opening, the home, and the homeowner. There are no standard sizes, no off-the-shelf solutions, and no compromises made in the name of convenience.
If you are at the beginning of your project or simply exploring what is possible, get in touch and we will guide you through the process from the first conversation to the finished installation.
Let’s Talk
Whether you're renovating a home, specifying for a new build, or delivering a luxury interior for a client — we’re here to help.
At Joshua James, we work with architects, interior designers, homeowners and contractors across the UK to design and supply bespoke steel internal doors. Every door is crafted to exacting standards, tailored to suit each project’s vision, and built to stand the test of time.
If you're ready to elevate your next project with precision-made steel framed doors, let’s talk.
