Open Up Your Home to the Outside.
Premium aluminium bi-fold doors — concertina-style opening, slim frames and effortless operation.
True indoor–outdoor living.
Bi-fold doors fold concertina-style into a stack, leaving an almost completely open aperture between your home and garden. Available in 2 to 7 panel configurations.
Engineered for everyday use.
2–7 Panel Configs
Fold inward or outward, left, right or split.
Secure Locking
Multi-point shootbolt locking on every panel.
Any RAL Colour
Including dual-colour finishes.
Low Thresholds
Flush thresholds for level access.
Energy Efficient
Thermally broken frames and A-rated glazing.
Built to Last
Premium running gear backed by manufacturer warranty.
Recent Work
Bi-Fold Doors projects we've completed
Frequently Asked Questions
How your bi-fold doors are covered.
Alliance guarantees its installation workmanship for 2 years from completion.
Many products we install come with a manufacturer warranty. The exact cover and duration depend on the product and manufacturer selected, and are confirmed with your quotation.
Get a quote for Bi-Fold Doors.
Tell us about your project and we'll be back in touch — we aim to respond the same working day.
- Family-run since 1998
- Fully insured (£5m public liability)
- 2-Year Workmanship Guarantee
- Assure registered · REHAU Authorised · City & Guilds
- We aim to respond the same working day
- 1Tell us about the work
A few details about the job and where it is.
- 2We review your enquiry
A member of the Alliance team looks at what you need. We aim to respond the same working day.
- 3We get in touch
We'll discuss the job with you and arrange a quotation — with a site visit where the work needs one.
Speak directly with a member of the family-run team.
No call centres, no scripts. Just honest guidance from the people who'll be doing the work.
- Family-run since 1998
- Fully insured (£5m public liability)
- 2-Year Workmanship Guarantee
- Assure registered · REHAU Authorised · City & Guilds
- We aim to respond the same working day