How to Install Bi-Fold Doors Yourself
Knowing how to install bi-fold doors correctly is what separates a self-fit project that saves you money from one that costs more to put right. Express Bi-Folds Direct supplies aluminium bi-fold doors to self-fit homeowners, small builders and developers across the UK, and a large share of our customers fit the doors themselves. This guide sets out what is actually involved: the tools and fixings you need, the steps in a typical XP10 installation, and the points in the process where it pays to get things right first time.
Can You Fit Bi-Fold Doors Yourself?
For a competent DIYer or a tradesperson used to working with door and window frames, yes. Bi-fold doors are heavier and less forgiving than a single door, so the job asks for care with levelling and fixing, but it does not call for specialist glazing training. Most self-fit customers manage a standard 3 or 4 panel door over a weekend, working in pairs, since panels and frame sections are too heavy and unwieldy for one person to handle safely alone. This applies equally to the standard XP10 range and to XP10 Steel Look, which uses the same frame and fixing method with a different finish.
Where it gets harder is at the extremes: very wide bespoke doors, openings with an uneven or out-of-level structural opening, or first-floor installations. If any of that describes your project, it is worth reading through the full process below before deciding whether to fit it yourself or bring in a professional installer.
Tools and Materials You Will Need
Beyond the door itself, most of what you need for an XP10 installation is covered by our Fitters Pack (£60), which includes concrete fixings, wingtip fixings, steel fixings, expanding foam, silicone and toe and heeling packers, alongside the general tools required for the job. On top of that pack, you will need:
- A spirit level, ideally a long one for the frame plus a short one for checking packers
- A power drill and an SDS drill for fixing into masonry
- A mastic gun for the silicone
- A tape measure and pencil for final checks against your original opening measurements
- A second pair of hands. Bi-fold frames and panels are large and awkward, and levelling a frame is close to impossible working alone
If you have not already confirmed your opening size, our guide to measuring up covers how to take an accurate opening measurement before you order.
Step-by-Step: Fitting an XP10 Bi-Fold Door
The exact sequence varies slightly with threshold type and configuration, but a typical self-fit installation follows this order:
- Check the opening and DPC. Confirm the opening is square, level and the correct size, and that the damp proof course sits at the right height relative to your chosen cill.
- Offer up and level the frame. Position the frame in the opening and use packers to get it level and plumb in both directions before fixing anything permanently.
- Fix the frame. Secure through the fixing points using the concrete or steel fixings from the Fitters Pack, checking the frame stays square as each fixing goes in.
- Hang and adjust the panels. Fit the panels to the track and running gear, then use the adjustable hinges and rollers to get an even gap and smooth operation across the full run.
- Seal and insulate. Fill the perimeter gap with expanding foam, then seal internally and externally with silicone to keep the installation weathertight.
- Test the operation. Run the door through a full open and close cycle, check the locking points engage cleanly, and fine-tune the hinges if any panel binds or drops.
Rushing the levelling in step 2 is the most common mistake we see. A frame that is out of level by even a few millimetres will make every later step, from hanging panels to locking, harder than it needs to be.
Choosing the Right Threshold for a Self-Fit
Threshold choice affects both how the door performs once fitted and how straightforward the fitting itself is. The XP10 range offers two options, and it is worth deciding between them before your frame arrives, since the DPC and floor build-up differ for each.
Rebated Threshold
Our recommended threshold for weather performance, with a small upstand that sheds water away from the room. It suits most ground floor openings, particularly where wind-driven rain is a factor.
Low Threshold
A near flat-to-floor option for step-free access between inside and outside. It suits level-access projects but relies more heavily on correct fall and drainage outside the door to stay weathertight.
Self-Fit vs Professional Install: Cost and Time
Fitting the door yourself does not change what the door costs, only what you pay for labour. A bespoke XP10 3 panel door currently starts from £2,067.50, and a pre-made XP10 in anthracite grey starts from £1,590.00, before any installation cost. Add the £60 Fitters Pack and your own tools, and self-fit labour cost is close to zero beyond your own time. Our guide to supply-only versus supply-and-install pricing sets out what professional fitting typically adds on top, and our wider bi-fold door pricing guide covers the other factors that move the price. Every XP10 door carries the same guarantee regardless of who fits it, and delivery timescales are the same for self-fit and installed orders.
Time-wise, budget a full weekend for a standard 3 or 4 panel self-fit, working in pairs, plus extra time if you are also finishing plaster, flooring or decking around the new opening.
Expert Insight from Express Bi-Folds Direct Managing Director Steve Bromberg
Steve Bromberg, Managing Director at Express Bi-Folds Direct, has worked at the forefront of the aluminium bifold door industry since 2007. With products manufactured at the company’s 200,000 sq. ft Leeds facility, he brings direct experience in aluminium glazing, product quality, lead times and the practical needs of UK homeowners, builders, and trade customers.
“We built the XP10 range with self-fit customers in mind from the start,” explains Steve.
“The frame is designed so a competent pair can level, fix and hang it with ordinary tools and the fixings in our Fitters Pack, and the adjustable hinges give you room to correct a slightly imperfect fit rather than needing everything spot on first time. Where we do tell people to bring in a professional is wide bespoke doors and first-floor openings, simply because the margin for error shrinks as the door gets bigger.”
“Take your time on levelling the frame. Everything else in the install gets easier once that first step is right.”
Building Regulations and When to Get Help
Replacement external doors are covered by Building Regulations, whichever route you take. If you use a FENSA or Certass registered installer, compliance is handled as part of the installation. Fitting the door yourself means notifying Building Control separately, since a self-fit is not covered by a competent person scheme. Our guide to certification for new windows and doors explains how FENSA and Certass work and what a self-fit needs instead.
If your opening is non-standard, you are fitting at first floor level, or you would simply rather not take it on, our sister company Express Bi-Folding Doors offers a full supply-and-install service using the same XP10 range, with their team handling survey, fitting and Building Regulations sign-off. For more on choosing the right door before you fit it, browse our full range of buying guides.
FAQs
Yes. A competent DIYer or tradesperson can fit a standard XP10 bi-fold door using ordinary tools, our Fitters Pack and a second pair of hands. Very wide bespoke doors and first-floor openings are better suited to a professional installer.
Alongside the fixings, expanding foam and silicone in our Fitters Pack, you will need a spirit level, a power drill with an SDS drill for masonry, a mastic gun and a tape measure, plus a second person to help handle the frame and panels safely.
Yes. Replacement external doors fall under Building Regulations. A FENSA or Certass registered installer covers this automatically as part of the job, whereas a self-fit means notifying your local Building Control separately. Our certification guide explains this in more detail.
Pre-made stock sizes arrive as a complete, factory-built unit for a set width, which removes some of the build-up work a bespoke size involves. Our guide to standard bi-fold door sizes covers which openings a pre-made size will fit, and you can browse the current pre-made range to check stock.
A Rebated threshold has a small upstand and is our recommended option for weather performance. A Low threshold sits almost flat for step-free access but depends more on correct fall and drainage outside the door. Either can be self-fitted, but get the DPC height right for whichever you choose before you fix the frame.
The Fitters Pack (£60) includes concrete fixings, wingtip fixings, steel fixings, expanding foam, silicone and toe and heeling packers, alongside the general tools required for an XP10 installation. It is not compulsory, but it covers the fixings and consumables most self-fit customers would otherwise need to source separately.
Wide bespoke doors, first-floor openings, and structurally uneven or out-of-level openings all reduce the margin for error and are better suited to a professional. Our sister company Express Bi-Folding Doors offers a full supply-and-install service on the same XP10 range if you would rather not take the fitting on yourself.
Visit our Showrooms or Talk to Our Team
See the Doors Before You Fit Them
If you would rather see an XP10 bi-fold door in person before you commit to a self-fit, our showrooms including our flagship HQ Leeds showroom has full-size displays you can open and close for yourself. Our team can talk through configuration, threshold choice and what the Fitters Pack covers for your specific opening, or you can get in touch with your measurements for a straight answer on price and lead time.