Aluminium bi-fold doors are the go-to choice for larger openings — slim sightlines, strong, slender frames, and a genuinely contemporary look that folds back to connect a kitchen, dining room, or living space directly with the garden. We’ve been supplying and fitting aluminium bi-fold doors across East London and Essex since 1999, as a small, family-run FENSA-registered installer.

Choose Your System

We offer three leading aluminium bi-fold systems, so you can choose the right balance of budget, performance, and finish for your home:

Sheerline Index — Our Value Range

A streamlined, cost-effective aluminium bi-fold designed to cover the vast majority of standard openings without compromising on quality. Slim 134mm sightlines, a choice of 3 popular colours (white, anthracite grey, or black), and the same trusted Sheerline engineering as their premium range — just with a simpler specification to keep costs down.

Sheerline Prestige — Our Premium Range

More configuration flexibility (up to 7 panels), a wider choice of 12+ colours and finishes, and noticeably better thermal performance thanks to Sheerline’s Thermlock® thermal break technology. Comes with a 10-year guarantee as standard, with the option to upgrade to an Ultion-secured lock and handle for extra peace of mind.

Cortizo Bifold Plus — Our Top Specification

The slimmest sightlines available (110mm at the meeting point) for maximum glass and minimum frame, the best thermal performance of the three, and the greatest configuration flexibility — up to 14 panels on larger openings. The choice for anyone prioritising the very best light, views, and energy efficiency.

We’ll talk through which system suits your opening, budget, and priorities at your free survey — there’s no pressure to go for the most expensive option if it’s not what your project needs.

What’s Included

• Profile systems: Sheerline Index, Sheerline Prestige, or Cortizo Bifold Plus, chosen to suit your opening and specification
• Panels: configurable to suit wide and multi-panel openings, sliding and stacking neatly to one or both sides
• Glass: double glazed units with an argon-filled cavity, for the same thermal performance standard as our windows
• Security: The ingenious door locking system is fitted as standard across all our aluminium bi-fold doors.
• Weatherproofing: ISO-Bloco Hybratec perimeter sealing tape around the frame on standard brick-to-brick installations, giving a fully weathertight, expansion-tolerant seal — particularly valuable on an opening as wide as a bi-fold door
• Guarantee: FENSA registration plus an insurance-backed guarantee (IWG) on every installation, alongside our own manufacturer’s guarantee

Why Aluminium Bi-fold Doors Make a Difference

• Slimmer sightlines, more glass. Aluminium frames are significantly stronger than uPVC for their size, meaning narrower frames and more visible glass across the same opening.
• Built for wide openings. Aluminium is the standard choice for larger multi-panel bi-folds, where strength and rigidity matter more as the opening gets wider.
• A contemporary look. Slim, clean lines suit modern extensions and renovations particularly well, and are available in a wide range of finishes.
• Indoor-outdoor living. Fold the doors back on a summer’s day and the boundary between kitchen and garden effectively disappears — ideal for entertaining or simply enjoying the space.
• Security without compromise. The Ingenious locking system provides multi-point security across every panel, so a wide opening doesn’t mean a weak point.
• A weathertight seal that lasts. Wide openings are more exposed to building movement and expansion than a standard window — exactly where a lot of installers cut corners with basic sealant. We use ISO-Bloco Hybratec perimeter tape on standard brick-to-brick installations, sealing the full perimeter of the frame while flexing with natural building movement.

The Southeast Windows Difference

We don’t employ salesmen, and we don’t do pressure tactics. When you get a quote from us, it’s one clear, all-in figure — not a starting price designed to be negotiated down on the doorstep.

• Family-run since 1999 — we survey every job personally
• FENSA registered (No. 29093) with full building regulations compliance
• Insurance-backed guarantee as standard, so your guarantee is protected even if we’re not trading in future
• Local knowledge — based in Plaistow, we know East London and Essex properties and their quirks, including the kind of structural openings involved in large bi-fold installations

Our Process

1. Free survey — we visit, measure the opening, and talk through panel configuration, profile system, and where the doors will stack
2. Clear quote — one total figure, no hidden extras, no hard sell
3. Installation — timing depends on the size of the opening and any structural work involved; we’ll confirm this at the survey stage
4. Guarantee registered — FENSA certificate and insurance-backed guarantee issued on completion

Areas We Cover

We install aluminium bi-fold doors across East London, including Plaistow, Newham, Stratford, Leyton, Walthamstow, East Ham, and Romford, as well as Essex towns including Epping.

Frequently Asked Questions

How much do aluminium bi-fold doors cost?

Costs vary depending on the profile system, the number of panels, the size of the opening, and the specification. We provide a single, clear quote after a free survey — no per-item pricing games.

Why choose aluminium over uPVC for bi-fold doors?

Aluminium’s strength allows for slimmer frames and larger glass panels across wider openings, which is why it’s the preferred choice for most bi-fold installations, particularly larger ones.

Which profile system is right for my home?

It depends on your opening, budget, and priorities. Sheerline Index offers excellent value for standard openings; Sheerline Prestige adds more configuration flexibility and thermal performance; and Cortizo Bifold Plus is our top specification for the slimmest sightlines and best energy efficiency. We’ll talk through the options at your free survey.

Will I need structural work?

Some openings require a structural lintel or beam to support a wider opening than the existing door or window. We’ll identify this at the survey stage, so there are no surprises in your quote.

What guarantee comes with my new doors?

Every FENSA-registered installation comes with a manufacturer’s guarantee plus an insurance-backed guarantee through IWG (Insured Windows Guarantees Ltd, FCA No. 310784).

Do you use salespeople?

No. We provide written quotes for every job directly — there’s no separate sales team and no commission-driven pricing.

Want to know More?

Call us today for your FREE, no-obligation quotation or fill out our Contact Form! For the most modern, energy-efficient replacement Windows, Doors and Conservatory with a 10-year Insurance Backed Guarantee for complete home Comfort & Designed to Keep You Warm, Safe, & Secure.

Alternatively, call your local number below to arrange an appointment.

East London Double Glazing: 020 8472 4088 (head office)
South London Double Glazing: 0203 856 6667
North London Double Glazing: 0203 856 6669
Epping: 01992 940 809
Chelmsford Double Glazing: 01245 208 058
Romford Double Glazing: 01708 202 457
Great Dunmow Double Glazing: 01371 704 771