How to fit bifolding doors: a step to step guide on everything you need to know to fit your own.

Let the outside in with your newly fitted bifolding doors. In recent years, bifolding doors have become all the rage, allowing a spacious alternative perfect for the summer months. Bifolding doors provide unobtrusive style, tidying up your living space and doing your job for you.

Fitting a bifolding door sounds daunting, especially when it comes with a wedge of paper instructions – but do not be alarmed! This blog aims to create a more accessible alternative to those dreaded instruction sheets. 

Properly fitted bifolding doors can allow a huge amount of light into a room, with a contemporary feel they are make a great asset to any house. So, without further ado, let’s get stuck into our blog on how to fit bifolding doors! 

how to fit a bifolding door

How to fit a bifold door: preparation.

Making sure that you are thoroughly prepared for your DIY venture is essential to both, productivity and safety. So make sure that you have everything you need before you begin.


  • Get an old dust sheet and spread out the contents of your tool box, having them visible and to hand will make the job much less tedious.
  • Ensure that you have all of the tools required before you start because if you don’t double check, you won’t be able to install those doors!


  • Fitting bifolding doors requires using some rather fiddly screws and drills and so remaining safe is of utmost importance.
  • Wear safety glasses to ensure that your eyes are safe throughout


  • More people than you think buy everything that they need to fit bifold doors without actually measuring, make sure you measure before attempting to fit your doors.

How to fit a bifold door…step 1

  1. Prepare your sill: apply a small amount of silicone to the rebate in the top part and then simply, push the two parts together. 
  2. Drill: the next step is to drill your pilot holes (each bifold door will come with specific measurements unique to our doors here at ATT Fabrications) ensuring you drill them through the three fixing holes. They can be found on the underside of the sill. 

How to fit a bifold door…step 2

  1. Assemble the frame: wood screws and gaskets are a necessity for this section. Make sure that your silicone sealant is to hand so that you can apply some to each of the head assembly, both sides of the tenon and finally the mill end of each jamb assembly.
  2. Once you have done this, you need to make sure that you fix the jamb assembly to the head assembly.
  3. Slot the tenon into the end of the jamb assembly and screw them together. 

How to fit a bifold door…step 3 

  1. Frame fitting:nafter all of those fiddly and intricate steps, it’s time to fit your frame.
  2. This is likely to be a two person job, so guide the frame into the designated area. 
  3. Adjust your frame’s position to make sure that the fixing holes in the head track are in the perfect position.
  4. Now, move the frame head to allow for any pre-drilling that needs to be done which is above the lintel which subsequently will need to be drilled through the holes in the lintel.

How to fit a bifold door: step 4

  1. Packing should now be positioned between the head and the top of the opening. 
  2. Be sure to use a spirit level to ensure everything is straight.

How to fit a bifold door: step 5

  1. Now secured by your packers, drill instruction-specified holes into the frame structure and through holes in the jambs.
  2. You should now be able to fit your frame fixing bolts through your jambs and into the wall. 

How to fit a bifold door: step 6

  1. Find a fixing point: Each of your sill ties need to be drilled in preparation for the masonry plug.
  2. Now you will need to double check the jambs are perfectly vertical and that the head and sill are in level with one another.

How to fit a bifold door: step 7

  1. At this point in the process, you should be ready to fix the head.
  2. The exterior fittings need to be attached to the head in stages; start with the two outer fittings and lighten the fixing screw a little bit tighter (be careful not to over tighten).
  3. Then, carefully tighten the central screw so that the head and lintel are nearly touching.
  4. Moving onto the jambs (and working from the outside in) again, lightly tighten the screws ensuring that you vary the packing between the head and the lintel in order to create an upward curve towards the head.
  5. Once you’ve achieved your desired curve, tighten the screws where appropriate.
how to fit a bifolding door

How to fit a bifold door: step 8

  1. Now it’s time to get the hinges up. Fit the pivot and carrier hinges into your top track. The cut outs can be at one or both ends of the top track.
  2. Ensure that the top and bottom blocks of your pivot hinges are in an appropriate position so that your adjustment screws are in reach after the fitting of your bifold doors. 

How to fit a bifold door: step 9

  1. Now you should have installed your carrier hinges and pivots you’re good to mount your doors.
  2. It’s important to note that every bifold door is different, so be sure to consult your individual instructions if, at this point, how to hang your doors isn’t self explanatory. 

How to fit bifold door: step 10

Now, you should be reading this whilst admiring your shiny new bifolding doors, well done! 

Here at ATT Fabrications we are proud of our bifold doors and hope that you have not only assembled your own doors successfully but also enjoyed doing so. If you’re now onto your next ‘door project’, why not take a look at our sliding patio door options for another stylish door alternative?

Please remember to seek help from a professional or contact us here at ATT Fabrications for further assistance if you struggle.

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