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Install internal bi-fold doors.
Room-divider bi-folds — open up two rooms into one when needed, separate them when you don't.
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Costs, timelines, pitfalls and the right questions to ask before any doors starts on internal Bi-Fold Doors.
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Four moves that separate a smooth job from a nightmare.
Header sag
A 6-leaf solid-oak divider can weigh 80–100 kg. A standard stud-wall header sags under that — reinforce with steel or a doubled timber.
Hinge wear
Cheap pivot hinges wear out in 2–3 years on frequently used dividers. Specify quality brass or stainless.
Pinching fingers
The folding action catches fingers between leaves — fit anti-trap inserts if children use the space.
No bottom guide
Without a bottom guide pin the leaves swing freely and bang the wall.
Costs & timeline
Know what it costs. Know when it ends.
Indicative UK ranges and what affects price.
Cost range
By job type
Inc. VAT · 2026
Source: NMT quotes
Source: NMT quotes
Wardrobe bi-fold set (2-leaf)Pine or oak veneer
£120–£320
Room divider bi-fold (4-leaf 2m)Glazed or solid
£350–£900
Glazed concertina divider (6-leaf 3m)Industrial-style French panes
£900–£2.2k
Track & hardware kitEclisse, Henderson, Hafele
£80–£300
Carpenter labourHalf to one day
£200–£500
Header reinforcementIf existing header is too light
£80–£300
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Quote spread is typically ± 18% — always get 3 quotes.
At a glance
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Internal bi-fold doors fold concertina-style to one side, splitting open-plan rooms or covering wardrobe openings without taking up swing space. They are the flexible answer to dividing a kitchen-diner, a study from a living room, or a wardrobe alcove. Expect to pay £350–£1,800 fitted in the UK depending on width and finish.
What Does the Work Involve?
The track is screwed to a header that's fixed to the existing structure (or built as a new stud header). The leaves hang from top-running rollers and pivot at the hinges between leaves. The end leaf is fixed; intermediate leaves fold and slide. A bottom guide keeps the doors aligned. For wardrobe doors, the kit typically includes both the head track and matching threshold; for room dividers, only the head track is needed.
Typical Costs
| Item | Low (£) | High (£) | Notes |
|---|---|---|---|
| Wardrobe bi-fold set (2-leaf) | 120 | 320 | Pine or oak veneer |
| Room divider bi-fold (4-leaf 2m) | 350 | 900 | Glazed or solid |
| Glazed concertina divider (6-leaf 3m) | 900 | 2,200 | Industrial-style French panes |
| Track & hardware kit | 80 | 300 | Eclisse, Henderson, Hafele |
| Carpenter labour | 200 | 500 | Half to one day |
| Header reinforcement | 80 | 300 | If existing header is too light |
How Long Does It Take?
Wardrobe bi-fold install: 3–4 hours. Room divider with 4–6 leaves: 6–8 hours including header reinforcement.
DIY or Professional?
Wardrobe bi-folds are a confident DIYer's job. Room dividers above 2m wide are professional — the track must be levelled within 1–2mm and the existing ceiling joist or header has to take the full hanging weight.
Choosing the Right Tradesperson
For room dividers, use a carpenter with hardware experience — Henderson, Hafele, Eclisse are the UK brands. Ask the warranty period on the track (5+ years is normal). Confirm the maximum leaf weight the system supports.
UK Regulations
Internal doors don't need notification. Bi-fold room dividers between a habitable room and an integral garage need to be FD30 fire-rated. Glazing in panels within 800mm of finished floor level must be safety glass to BS 6206 (Part K).
Common Problems
- Header sag: A 6-leaf solid-oak divider can weigh 80–100 kg. A standard stud-wall header sags under that — reinforce with steel or a doubled timber.
- Hinge wear: Cheap pivot hinges wear out in 2–3 years on frequently used dividers. Specify quality brass or stainless.
- Pinching fingers: The folding action catches fingers between leaves — fit anti-trap inserts if children use the space.
- No bottom guide: Without a bottom guide pin the leaves swing freely and bang the wall.
Frequently Asked Questions
Bi-fold or sliding for a wardrobe?
Bi-folds give 100% access to the inside of the wardrobe. Sliders give 50% but look sleeker. For deep wardrobes (650mm+) bi-folds are better; for shallow built-ins, sliders win on aesthetics.
How wide can an internal bi-fold be?
Up to 4m on a single track. Above that you need two opposing bi-folds meeting in the centre, or a separate track system.
Can the doors fold flat to the wall?
Yes — with a parking system the leaves rotate 90° at the end of the track and park flat against the wall. Worth the upgrade for open-plan layouts.
Are internal bi-folds acoustic?
No — there are always gaps at the meeting stiles, so sound passes easily. For acoustic separation use hinged doors or a sliding cassette door with brush seals.
Can the bi-fold be glazed?
Yes — industrial-style French-pane glazed bi-folds are very popular as kitchen-diner room dividers. Use laminated safety glass if leaves are within 800mm of floor.
Do bi-folds need a bottom track?
Wardrobe bi-folds usually have a bottom track or guide. Room-divider bi-folds typically use just a pivot pin at the floor — no obstruction underfoot.
This guide was written with AI assistance and is intended for general information only. Prices are estimates based on UK averages and may vary by region. Always get at least three quotes and consult a qualified professional before starting any work.
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