Bi-fold Doors

Bi-fold Doors

Thermfold™ is the highest quality bi-fold door system on the market. The design features premium handles, heavy duty hinges, flexible door configurations and thermal insulation that keeps you warmer in winter and cooler in summer.

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Folding doors connect your home and garden

Our bi-fold doors combine full-length, double or triple-glazed door units with slim frames to maximise natural light when they are closed.

The doors are available in a choice of grey, black, cream or white standard RAL finishes to suit your property. These colours correspond with our powder-coated skylight range, creating a uniform product suite to enhance and complement your home.

Doors open safely and easily, with child-friendly gaskets to prevent fingers being trapped between the panels. Low threshold sills create a flush transition from your indoor floor to your outdoor patio or decking area.

Explore our units

Bi-Folding doors

Marine-grade material

Marine-grade powder coating offers exceptional durability and weatherproofing. Standard RAL colours: grey, black, cream or white.

Concealed outer fixings

Child-friendly gaskets stop fingers being trapped. Heavy duty handles and hinges for durability

Reflex Glass

Low-maintenance, self-cleaning glass as standard. Filters up to 99% of harmful rays to prevent bleaching of furnishings and fabrics

Robust, aluminium frame

50mm composite thermal break offers unrivalled thermal and noise insulation.

Choice of glazing

Choose from double or triple glazing, offering unrivalled energy savings. Low overall U-value of 1.0 W/m²K

Strong, secure and super-insulating

Our bi-fold doors are reassuringly solid and carry a 10-year ERA Five-star security guarantee against forced entry.

The doors are available as triple glazed, with 44mm argon-filled glass units, and feature a 50mm composite thermal break. This configuration offers unrivalled thermal insulation between the internal and external door.

This high standard of insulation offers maximal energy savings and is designed to keep your home warmer in winter and cooler in the summer.

We are the leading manufacturer

Delivery icon

Next day delivery on stock sizes

Glazing icon

Triple glazing as standard U-Value of 0.6

Clean glass icon

Easy clean glass as standard in a choice of colours

30 year expectancy icon

Bespoke sizes, made to order at no extra cost

Energy icon

Super energy saving reflex+ glass made in house

20 year warranty icon

20 year unit seal warranty on all glass rooflight products

Aluminium joint icon

Slim aluminium glazing joints No chunky glazing bars

Aluminium covers icon

Slimline aluminium covers maximise the natural light

Technical Specifications

Aluminium bifold doors

ThermFold is the highest quality aluminium door system on the market with the longest warranty direct from the manufacturer, not a middle man! We have been manufacturing premium aluminium and glass products since 2001.

Buying direct from a manufacturer is the perfect situation, you get the highest specification products with the longest warranties, the best most accurate product advice, technical service, prices and deals, as well as post sale customer care.

View more specifications and resources View more


6mm touchened safety glass. U-Value: 0.6w/m2k


44mm Triple glazed argon filled




50mm polymer insulating sections

Extrusion cavity

Composite thermal break


See Declaration of conformity for all standards

Tell us about your Bi-fold Doors

  • Size
  • Roof vent
  • Orientation
  • Colour
  • Frame colour
  • Blinds
  • Solar power
  • Anti-slip
  • Delivery
  • Assembly costings
  • Quantity
  • Summary
Your price: £820
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Please choose your size

All of our sizes are internal, from timber to timber

1000mm x
Do you need a bespoke size? No  Yes Bespoke toggle

Would you like to add roof vent

Choose your orientation and preferred style

Choose your tinting preferences

Glass tint


Clear glass is our standard option

Glass tint

Light Blue (£120)

Removes the harsh glare from sunlight and protects furniture fro m the fading effects of sunlight

Glass tint

Privacy (£150)

Creates a natural filtered light. It is not possible to see through this glass from either side

Glass tint

Sun Tint (£280)

Darkens with the sun’s heat. Starting at 50% light transmission down to 10% on sunny days

Choose your Aluminium roof colour

Would you like black out blinds?

Solar powered module

A great option to consider if you don’t want to plan in electrical requirements and want to have a more eco-friendly rooflight (rain sensor unit is not compatible with the solar module).

Where would you like your units delivered?

Assembly costings

How many units do you need?


Your price: £1330

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valid until 22/11/2016 Add to basket
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Call us today on 0116 269 6297 Quote Reference: n/a
Fixed Flat - Standard Size: 1000mm x 1000mm (internal size) £820
Tinting: Clear Tint £0
Blinds: White Blinds £380
Delivery: Devon or Cornwall £130
Quantity Discount (1%) £-91.43
VAT £266
Total including VAT £1,596
Fixed Flat - Standard Size: 1000mm x 1000mm (internal size) £820
Tinting: Clear Tint £0
Blinds: White Blinds £380
Delivery: Devon or Cornwall £130
VAT £266
Total including VAT £1,596

Contact us about your price

Call us today on 0116 269 6297 Quote Reference: n/a

Email my quote

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Your questions, answered

What is a U-value?

The U-value of a product measures how effective its insulation properties are. The lower the U-value, the better the insulation. As a guide, a standard double-glazed window typically has a U-value of 2.8 W/m².

What is a thermal break?

A thermal break is a material with low thermal conductivity placed between conductive materials to reduce or prevent the flow of thermal energy.In our products, these thermal breaks include resin, silicone and styrofoam, which separate the conductive aluminium components to provide superb thermal insulation.

How can I get a price?

Simply choose your bi-folding door specifications in the form above for an instant price.

What are the size ranges of your doors?

Our standard range comprises widths from 1200mm up to 6000mm and heights from 2000mm up to 2400mm. For sizes outside this range, please contact us.

What door configurations can I choose from?

Our bi-fold doors are designed for optimal flexibility. You can choose to have all the panels opening or split them anywhere along the length.

Can I see your products in person?

Yes , our Leicester showroom welcomes both trade and residential customers. Here you can see our range of products and our manufacturing facilities.

Our experienced sales team will be on hand to answer any questions and demonstrate the product features, such as the manual or electric opening roof vents, which provide natural ventilation

How quickly can I get my order delivered?

Bespoke products are usually delivered to your site within 10-15 working days.

This timescale can be improved upon by a few days if you choose to collect your products from our Leicester factory.

Can I collect from you?

Yes, if you would prefer to collect direct from our Leicester factory, please let us know when you place your order.

What are your payment terms?

Payment terms for normal orders are strictly pro-forma, using Visa, Mastercard, bank transfer, WorldPay or Paypal.

Paying via Visa or Mastercard not only insures the product and your risk, but also gives you up to 60 days free credit, depending on which card you have.

For larger orders, or orders that do not require immediate delivery, we offer a 50% deposit option with the balance being due just prior to delivery or collection

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