How to Fit a Loft Door Yourself: Measuring, Tools and a Four-Step Method
Picture the classic Victorian terrace knock-through: front and back reception rooms opened up, and now you want the daylight to carry through without losing the option of shutting one room off. A steel-framed glazed door from Manufaktur X does exactly that, and because it turns up as one welded, powder-coated frame with the holes already drilled and the screws in the crate, a single door is a Saturday afternoon's work for a capable DIYer and a helper. What makes or breaks it isn't the drilling. It's whether the opening was measured in several places with roughly 5 mm of clearance each side, and whether the frame was wedged dead plumb before the first screw went in. Below: what to check before you order, what to have in the toolbox, how the frame goes in, the four fitting steps, and the handful of situations where a local joiner is the better call.
A single loft door can be fitted by a competent DIYer with one helper: measure the clear opening at several points, take about 5 mm per side off the smallest figure, wedge the welded steel frame plumb with a spirit level, screw it to a load-bearing wall through the pre-drilled holes with the supplied screws, press in the plastic caps and test the swing. A double door needs two people throughout.
A loft door is an internal door with a welded steel frame and a glazed infill that closes one room off from another while letting daylight and sightlines pass through. As a result it is fitted like a door rather than a window: the frame has to stand plumb in the opening or the leaf will not close cleanly.
Want to see your opening as a door before you read on? Enter your measured width and height in the 3D loft-door configurator - single, double or pivot, hinge side, opening angle and side panels all redraw live, and the price updates as you go. No need to order just to have a look.
The short version
- One leaf: a realistic DIY job with a helper. Two leaves: two people from unboxing to final adjustment, or a joiner.
- Measure the clear opening at several points, then take about 5 mm off each side (left, right, top) of the smallest figure. That's the size you enter in the configurator.
- The steel frame is the frame. It's screwed straight to the wall through pre-drilled holes - no separate lining, no expanding foam, no plastering.
- A spirit level, a drill, wedges, a few washers and a second pair of hands are the whole toolkit; screws and plastic caps come in the crate.
- Manufaktur X doesn't fit doors. If you'd rather not do it yourself, book a local joiner - with the frame already drilled, it's a quick job for one.
What matters on fitting day
| Point | Why it matters |
|---|---|
| Whether it's a DIY job comes down to the number of leaves, not how handy you are | A single hinged or pivot door is manageable with a helper; a double door needs two people at every stage, because both leaves have to meet evenly in the middle. |
| The smallest measurement wins | Walls in older British houses rarely run true; measure width and height in several places and work from the smallest figure, or the frame will bind on one side. |
| About 5 mm a side is the whole tolerance | That allowance gives you room to wedge the frame plumb. Anywhere the gap is wider, you pack it out with a washer at the fixing - you never pull the frame to the wall. |
| No lining, no foam | The welded steel frame is screwed through its pre-drilled holes into a load-bearing wall, or into a stud wall with solid timber behind the board. There's no foaming and no plastering. |
| A pivot door leaves the floor alone | It turns on a frame-mounted hinge with an offset axis and needs no floor fixing, which matters if you've got underfloor heating. |
| When to call a joiner | A double door, a stud wall you can't see into, or nobody to hold the level: any one of those is reason enough. |
Which openings are a DIY job, and which are not?
A single made-to-measure loft door from Manufaktur X can be fitted by a competent DIYer with one helper, because the welded steel frame is screwed straight to the wall through pre-drilled holes with the supplied screws, and a detailed fitting manual comes in the crate.
A double door is a different proposition. Two leaves have to meet evenly in the centre of one frame, so you need two people at every stage, and our product page recommends a competent fitter for exactly that reason. Our configurator data show that 52% of loft-door configurations chose a double door (233 sessions with this setting). For roughly half the doors we ship, then, the honest answer is "yes, with two of you".
Why put a glazed door where a solid wall would do? In a two-bed new-build flat or a narrow Edwardian semi, a room that borrows light from the next one feels bigger than its floor area, and a steel frame with safety glass does that while still letting you shut the door on the telly. The steel-and-safety-glass door in your own dimensions is configured online with a live price, built in the EU and delivered to the UK in approx. 4-6 weeks, straight from the workshop with no dealer in between and customs and duties taken care of.
Single, double or pivot: what changes when you fit it yourself
Three cases cover almost every project. A single hinged door on side hinges: DIY with a helper. A single pivot door, which turns on a frame-mounted hinge with an offset axis and needs no floor fixing: DIY with a helper too, and the floor stays untouched. A double door: two people, both leaves lined up with each other, and the one configuration where a joiner is the sensible choice if you'd rather not tackle it yourself.
What's in the crate and what isn't
You get the welded, powder-coated steel frame with pre-drilled holes, the glazed leaf, the screws, plastic caps for the holes on the door side and the fitting manual. You don't get a separate lining, a fixing kit, foam, plaster or a fitting service. One safety point decides where the door can go at all: the loft door is an internal door - it is not a safety barrier and it is not designed to take a load. It's fixed only to load-bearing walls or solid construction, and never climbed on, hung from or loaded with extra weight.
Tools for fitting a steel-framed glazed door
Fitting a steel-and-glass loft door takes a spirit level, a drill with a bit to suit your wall, wooden or plastic wedges, a few washers, a tape measure, a pencil and a screwdriver, plus a second person; the screws and the plastic caps for the frame holes come with the door.
None of that is specialist kit. The one thing worth sorting before the day is the wall fixing: the screws come with the door, but whether your wall needs plugs, and which sort, depends on whether it's brick, block, concrete, steel, timber or a stud wall. Masonry bit for solid walls, wood bit for timber studs. Buy it beforehand, not with the frame already wedged in the opening.
What's supplied and what you bring
| In the crate | From your own toolbox |
|---|---|
| Welded, powder-coated steel frame with pre-drilled holes | Spirit level long enough to span a jamb |
| Door leaf with safety glass (toughened or laminated) | Drill with a bit to suit the wall |
| Screws | Wedges and washers |
| Plastic caps for the holes on the door side | Tape measure, pencil, screwdriver, wall plugs to suit your wall |
| Fitting manual | A blanket or some cardboard for the glass edge, and a helper |
Why a second pair of hands isn't optional
Wedging and levelling happen at the same time: one person holds the frame and taps the wedges in, the other reads the level and calls the correction. On your own, you have to let go of one to do the other. The leaf is the second reason. Steel and glass together are heavy, and a glazed leaf carried by one person down a hallway or round a turn in the stairs will catch a door frame glass edge first.
Measuring the opening in a British home
Preparation is three checks before you order: measure the clear opening at several points and take about 5 mm per side (left, right, top) off the smallest figure, confirm the wall is load-bearing or a stud wall with solid timber behind the board, and decide between a hinged and a pivot door.
The measuring rule is a short one: take the clear width, knock 5 mm off each side for the fitting gap, and if you've measured in several places, work from the smallest. In terraces and semis that have been altered a couple of times over the decades, the left and right reveals routinely differ, and a width taken at the top alone gives you a frame that binds at the bottom. The height range covers most British rooms: a Victorian reception room can run close to 3 m, a new-build flat often sits nearer 2.4 m, and the configurator accepts leaf heights from 1,800 to 3,000 mm and widths from 600 to 1,400 mm. Side panels and a transom are entered in millimetres too and take the same allowance; they're part of the one welded frame, not bolt-ons added later. Our configurator data show a median left side panel of 500 mm (118 sessions) and a median right side panel of 500 mm (112 sessions) - a handy sanity check if your opening is wider than a single leaf ought to be.
For a feel of a typical leaf: our configurator data show a median leaf width of 985 mm (286 sessions) and a median height of 2,125 mm (272 sessions). Leaf width is also the setting people change most often, which tells us the opening, not the design, is where the thinking happens.
Several points, smallest figure, 5 mm a side
Measure the width at the top, middle and bottom, and the height at the left and right reveal. The smallest figure is your number; the average is the wrong one, because a frame built to an average is too wide wherever the wall is narrower than that average. The 5 mm or so on the left, right and top is room to wedge the frame plumb, not a gap to fill.
Which walls will take a steel-and-glass door
Load-bearing walls in concrete, brick, blockwork, steel or timber are all fine. So are stud walls with solid timber behind the plasterboard. Plasterboard on its own isn't, and an uneven wall is no problem as long as it can carry the frame; the gap gets dealt with at the fixing.
Hinged or pivot: decide before you order
A hinged door hangs on side hinges. A pivot door turns on a frame-mounted hinge with an offset axis and needs no floor fixing, which is why we recommend it over underfloor heating. Our configurator data show 60% of loft-door configurations chose a hinged door (241 sessions with this setting). Hinge side, opening angle and swing clearance are all set in the configurator, so work them out against the room before you order. On glass: toughened (ESG) is 4 mm; laminated (VSG) is two 3 mm panes bonded with a 1 mm interlayer, so a laminated leaf is the heavier one to carry.
| Criterion | Hinged door | Pivot door |
|---|---|---|
| Hinge position | Side hinges on the frame jamb | Rotating hinge on the frame with an offset axis |
| Floor fixing | Leaf hangs on the side hinges; check with us before ordering if you have underfloor heating | None needed |
| Underfloor heating | Ask before ordering | Our recommendation - nothing is drilled into the floor |
| Swing to plan for | The full leaf width swings from the jamb | The leaf turns about the offset axis, so part of it swings the other way |
Go hinged if you want a classic side swing and a conventional stop; go pivot if the floor has to stay untouched, over underfloor heating for instance.
Checking the delivery
Before the glass comes out of its packaging, check that every part is there and undamaged. Transport damage does happen, however well it's packed: photograph it thoroughly and send the photos to the Manufaktur X team, and we'll sort it out. If it turns out your plan doesn't need a moving leaf at all, a fixed steel-and-glass room divider is the alternative: a partition with an optional walk-through gap, no hinges and no handle.
Why there's no door lining to fit
With a Manufaktur X loft door the powder-coated steel frame is itself the frame that sits in the opening: it's wedged plumb, screwed to the wall through its pre-drilled holes, and any gap on an uneven wall is packed out with a washer at the fixing. There's no separate lining to set, nothing to foam and nothing to plaster.
If you came here looking for tips on hanging a door in a lining, put that picture aside. What a conventional timber lining does, carrying the hinges and giving the leaf something square to close against, is done here by the welded steel section itself. No expanding foam, no plastering, no second frame. That's the whole point of the 5 mm allowance a side: it's the room you need to wedge the welded frame plumb before anything is fixed. Without it the frame gets forced into the opening, and a forced frame means a leaf that drags.
The steel frame is powder-coated in the RAL colour you choose, which makes it scratch-resistant, evenly coloured and hard-wearing. RAL 7016 anthracite grey and RAL 9010 pure white are two of the examples in the configurator, and any other RAL colour can be specified. Our configurator data show 28% of loft-door configurations chose a custom colour (229 sessions with this setting). Whatever the shade, a cloth under each wedge keeps the coating unmarked while you tap the frame about.
Wedges and plumb: the step that decides whether the door closes
Wedges hold the frame steady in the opening; the spirit level confirms plumb on both jambs and level across the head before you drill a single hole. Our product page puts it plainly: a frame that goes in out of true can mean a door that won't close properly later. Of the doors we hear back about, one that won't close after fitting is almost always a frame pulled towards the wall on one screw, not a production fault, and that starts right here at the wedging.
Where the holes sit in the frame
Drill through the pre-drilled frame holes into the wall. The holes should sit about 8 mm from the wall side and about 10-12 mm from the door side of the section. If your wall calls for it, you can drill extra fixing holes in the frame.
Uneven walls: pack it out, don't pull it in
Wherever a gap opens up between wall and frame, pack it out with a washer at that fixing. That stops the frame going under tension and keeps the door swinging freely. Tighten the screws carefully and never so hard that the frame distorts: a distorted frame is behind most of the "door won't close" cases we hear about, and putting it right afterwards is harder than a washer beforehand.
Curious how the frame changes with side panels or a transom? Toggle side panels and top light in the 3D configurator and watch the welded section redraw around your dimensions - the same frame you'll be wedging on fitting day, drawn to your numbers, with the price updating as you click.
On Victorian jobs I never trust a single width. I measure top, middle and bottom, take the smallest, and wedge the frame plumb before a single screw goes in. Doors that drag almost always started with a rushed alignment.
James W.
Bespoke furniture maker, London
The four fitting steps
Fitting the loft door takes four steps: prepare and position, wedge the frame plumb, screw it to the wall through the pre-drilled holes, then press in the plastic caps and test the swing.
The numbered steps below follow the manual that ships with every door. One thing before you start: if you ticked the optional door lock in the configurator, magnets in the frame hold the leaf shut against draughts, and a light pull or push opens it. For the magnet to catch, the leaf has to meet the frame evenly, which is one more reason to take your time over the alignment step. Anything the manual leaves open is covered by our answers to the most common loft-door questions or by the team.
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Step 1: preparation and position
Check that all the parts are there and undamaged. Decide where the door sits in the opening and make sure there's room for it to open and close: the full swing of the leaf at the angle you configured, with nothing in the arc. If you need extra fixing holes in the frame, drill them now, while it's still lying flat and easy to handle.
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Step 2: aligning the frame
Stand the frame in the opening and wedge it so it stays put on its own. Now the spirit level: the frame has to be dead plumb, checked on both jambs, not just one. Get this wrong and the door won't close properly later, and no amount of tightening rescues a frame that went in out of plumb. Tap the wedges, check the level again, and keep going until both jambs agree.
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Step 3: fixing to the wall
Drill through the pre-drilled frame holes into the wall. With every hole drilled, put the supplied screws in and tighten the frame up carefully without deforming it. Where there's a gap between wall and frame, pack it out with a washer at that screw so the frame isn't pulled under tension.
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Step 4: finishing and adjustment
With every screw tight, press the plastic caps into the holes on the door side. Then the swing test: open and close the leaf a few times and watch whether it runs smoothly and meets the frame evenly. If it doesn't, adjust it: slacken off, re-check plumb, add a washer where the wall is pulling, tighten again.
Getting a joiner in instead: what fitting costs
Fitting the loft door yourself costs only your time plus wedges, washers and wall plugs; Manufaktur X doesn't fit doors, so if you'd rather not do it yourself, a local joiner will quote their own price for the job.
So, two cost lines. DIY is a handful of consumables and an afternoon with a helper. A joiner's price is theirs to set, so we don't quote it. The door itself is priced live in the configurator as a transparent fixed price, straight from the workshop, with the lead time of approx. 4-6 weeks shown before you order. Because the frame arrives welded and pre-drilled, a joiner is looking at wedging, levelling and fixing it off, not at building a frame.
When we point customers to a joiner
Three situations: a double door, a stud wall you can't see into, and working on your own. Any one of them is enough.
| Criterion | Fitting it yourself | A local joiner |
|---|---|---|
| Who measures | You, in several places, smallest figure | The joiner, on site |
| Who carries and aligns | You and one helper | The joiner and their mate |
| Tools | Spirit level, drill, wedges, washers, wall plugs | The joiner brings their own |
| Responsibility for the fitting | Yours | The joiner's |
| Cost | A few consumables | Quoted to you directly by the joiner |
Fit it yourself if it's a single door on a solid wall and you've got a helper; book a joiner if it's a double door, a stud wall you can't see into, or you're on your own.
Who fits it, if not us
There's no fitting service for this product. The steel frame arrives pre-drilled and is screwed straight to the wall; a heavy or double leaf needs two people, and if you'd rather not do it yourself, you get a local joiner in. Booking, payment and responsibility for the fitting sit with the joiner, not with us.
What the door itself costs
The price of a steel-framed glazed door in your own dimensions depends on size, number of leaves, glass design, safety-glass type and options, and updates live in the configurator. The 5-year guarantee covers the door. Questions about a quote? Contact the Manufaktur X team.
| Product | From | Note |
|---|---|---|
| Loft Door | £815 | Lowest possible option |
| Room Divider | £1,900 | Steel + laminated glass, custom width |
| Large Shelf | £2,750 | Solid wood, steel frame, floor-to-ceiling |
| Dining Table | £1,360 | Solid wood, steel frame |
| Coffee Table | £995 | Solid wood, steel frame |
| Bench | £945 | Solid wood, steel frame |
| TV Stand | £1,325 | Solid wood, steel frame |
| Pipe Shelf | £915 | Modular pipe shelf |
1.7 rooms per person - that is the average across the EU in 2024. In that much space, a glazed door is the difference between two dim rooms and one connected one.
You now know which openings you can tackle yourself and which you can't. Next, put your own numbers in: configure the door to your measured opening, compare hinged and pivot in the 3D view, and if it turns out to be a double door, line up a second person or a joiner before you order.
The mistakes we see most often after delivery
The most common fitting mistakes with a loft door are an opening measured in one place only, something in the swing arc that nobody checked, a frame pulled into an uneven wall instead of packed out with a washer, and fixing into a wall that can't carry the door.
The complaint we deal with most after delivery isn't a production fault but a mis-measured opening: a figure taken off a drawing rather than the wall, or from one spot instead of several. Loft doors tend to go into tight renovations, and in a terraced house the swing arc is competing with a radiator under the window, a light switch by the jamb and furniture that has nowhere else to go. Manufaktur X gives a 5-year guarantee on the door; a fitting mistake is on you, so measuring twice is the cheapest insurance going. Not sure about a sketch? Send your measurements to the Manufaktur X team before you order. By the end of 2027 we expect stud-wall openings with proper framing behind them, typical of new-build flats, to be the most common fitting situation, which shifts the DIY question from wall type to measuring discipline.
Measured in one place only
What happens: the frame binds on the narrower side or leaves a visible gap on the wider one. How to avoid it: several points, smallest figure, then the 5 mm allowance a side. The difference between the drawing and the wall is exactly what those extra measurements catch.
Skirting, radiator or socket in the swing arc
What happens: the leaf stops on a skirting board, a radiator or a switch before it reaches its opening angle. How to avoid it: mark the swing out on the floor before you order, then pick the hinge side and opening angle in the configurator to suit.
Frame pulled into the wall
What happens: a distorted frame and a leaf that drags or no longer reaches the magnet. How to avoid it: a washer at every fixing where the wall stands back, and screws tightened evenly rather than cranked down.
Fixed into a wall that can't carry it
What happens: the screws work loose and the door drops. How to avoid it: on a stud wall, fix into the studs or solid timber behind the board; otherwise fix into a load-bearing wall, and remember the door itself is neither a safety barrier nor built to take a load. Plasterboard with nothing behind it is a job for a joiner, not for longer screws.
FAQ: fitting a loft door yourself
Does a fitting manual come with the door?
Yes, a detailed fitting manual comes with every loft door, and the Manufaktur X team is on hand for anything it doesn't cover.
The manual covers the same four steps as this guide: preparation, alignment, fixing, finishing. Keep it with the wedges and screws on the day rather than in the recycling with the packaging; the drilling positions are in it.
Which walls are suitable for a loft door?
Load-bearing walls in concrete, brick, blockwork, steel or timber are all fine, and so are stud walls with solid timber behind the plasterboard.
On a stud wall, fix into the timber, never into plasterboard alone. The door is not a safety barrier and isn't built to take a load, so the wall carries the frame and the frame never carries anything else.
Could I build a loft door myself rather than buy one?
Building the door itself means welding a steel frame square, powder-coating it and glazing it with safety glass, which is workshop work.
Fitting a factory-made door yourself is the realistic DIY part. The frame arrives welded, pre-drilled and coated, the safety glass is already in the leaf, and your job is the one that needs a spirit level rather than a welding set.
Steel or timber loft door: which is easier to fit yourself?
A timber door is lighter to carry, while a steel-and-glass door is heavier but arrives as a rigid welded frame that can't be planed or forced, so the measurement has to be right.
Manufaktur X builds loft doors in steel with safety glass only; there's no timber leaf in the range. With a helper and the 5 mm allowance a side, a single steel door is a DIY fit; the weight is a two-person question, not a skill question. More on handling and options in our loft-door FAQ.
What is the difference between a pivot door and a hinged door when fitting?
A hinged door hangs on side hinges, whereas a pivot door turns on a frame-mounted hinge with an offset axis and needs no floor fixing.
Nothing gets drilled into the floor for a pivot door, which is why it's the recommended choice over underfloor heating. For the fitting itself both types are wedged, levelled and screwed off the same way; the difference is where the leaf turns, not how the frame is fixed.
In Munich period lofts the walls are rarely square, and I plan every steel door around the smallest measured opening. Washers at the fixings, not tension, keep the frame true; that single habit saves most readjustment visits.
Lukas B.
Interior architect, Munich
Measure to the wall, configure to the number, fit with a helper
A loft door configured to your measured opening, with about 5 mm allowance a side, is the version you can fit yourself in four steps with one helper.
The rule stays simple. Single door, solid wall, helper on hand: do it yourself. Double door, stud wall you can't see into, or nobody to hold the level: book a joiner. Either way the door is made to measure in the EU, delivered in approx. 4-6 weeks and covered by a 5-year guarantee. By Q2 2027 we expect the pivot door to overtake the hinged door in our configurator for renovation projects with underfloor heating. Start with the 3D loft-door configurator; for more fitting and measuring guides, the Manufaktur X blog is the next stop.
Measure your opening in several places, take about 5 mm off each side, and configure your door to exactly that size in the live configurator: single, double or pivot, with the hinge side and opening angle your room needs. The price updates as you configure, the door is made in the EU in 4-6 weeks, and if it's a double door or a stud-wall opening, line up a second pair of hands or a local joiner before you order.
Configure your door to your measured opening · If you'd rather not fit it yourself, get a local joiner in
