Sliding patio bifold doors

 At Green Home Glazing we have architectural, environmental, design and construction expertise and we are here to assist you with choosing the right solution for your home project.

This is why we have prepared this Guide on sliding patio bifold doors:

  • to answer your most common questions,
  • to inform you on what adds value and what works best, and
  • help you understand the best options for your budget and requirements.


  • Do bifold doors add value?
  • What is the best type of bifold doors?
  • Which is better bifold or sliding doors?

The installation of sliding patio doors and sliding folding patio doors will have a transformative effect to your home and how the kitchen, dining and living areas connect to your garden.

According to BuildIt, investing in good quality doors and glazing is one of the best ways to add value to your home:

“Clever use of glazing can make a dramatic statement that completely transforms an existing space. Bifold doors are one way of connecting the garden and living space in a seamless way.”

 At Green Home Glazing we will help you choose the best type of bifold doors for your home and internal layout in order to let in natural light and maximise views to the garden.

You might want to have the widest possible door opening to connect the interior spaces to the garden; in this case we would suggest bifold doors that will “fold away” to create the ultimate inside-out feel, weather permitting.

Or instead you might prefer the elegance and the contemporary feel of sliding glazed doors and the larger glazed panels that are possible with this door type.

Our Chartered Architect director, Royal Institute of British Architects (RIBA), will advise you on options in terms of materials (timber patio doors, aluminium frames or industrial-style steel frames) and whether it is sliding doors or folding doors that work best with your property layout and your personal preferences.




  • Should bifold doors open in or out?
  • What is the best material for bifold doors?
  • Can bifold doors go around corners?

Bifold doors can open inwards when the internal layout allows for it or they can open outwards when the garden layout allows for it.

In fact, bifold doors can go around corners directly in a “wrap around” way where the doors fold around the corner column supporting the wall above or in a column-ness way when the structural design has created a column-free corner.

“Unlike sliding or French doors, bifolding designs stack neatly out of the way, providing gloriously open access to the garden – and an expansive feeling inside.” Ideal Home.

The three main materials we offer when it comes to folding and sliding patio doors are:

Timber frames – stylish, they work well with period homes and properties, and the most environmentally friendly choice irrespectively of the choice of glazing for the doors.

Aluminium frames – with a more contemporary appearance, they have slimmer frames when compared to timber bifold doors, and with minimal maintenance requirements.

Steel frames – due to the strength of steel these frames can be very thin and elegant and they come in a variety of styles and appearance.

All our doors at Green Home Glazing come in triple glazing as standard to offer you the best environmental performance and value for money.



  • Do you need planning permission for bifold patio doors?
  • Do I need Building Regulations approval for bifold patio doors?
  • Do I need Freeholder (Licence to Alter) approval for bifold patio doors?


You do not usually need to apply for planning permission for the insertion of new windows and doors that are of a similar appearance to those used in the construction of the house (note – a new bay window will be treated as an extension and may require permission).

However occasionally you may need to apply for planning permission if your council has made an Article 4 Direction withdrawing permitted development rights from your area. If you live in a listed building, you will need listed building consent for any significant works – internal or external, and this includes the installation of any patio doors.

If your house is in a designated area (conservation area, national park, area of outstanding natural beauty) there may also be additional restrictions in place. In all these cases, you are strongly advised to check with your local planning authority before carrying out any work. Planning Portal.

At Green Home Glazing our Chartered Architect director, Royal Institute of British Architects (RIBA), will advise you about all relevant planning requirements, will liaise with your local planning authority, and will obtain any necessary planning approvals on your behalf. (see GOAStudio London residential architecture).

Building Regulations

The replacement or installation of new patio doors might require Building Regulations approval. Building Regulations relevant matters include the thermal performance of the glazed doors, safety glazing, ventilation, fire safety, and access. Planning Portal.

At Green Home Glazing we work with London Building Control Approved Inspectors to assess all the Building Regulations related issues for your project and offer certification for all door and window replacement and alterations.

Freeholder approval

If you are a leaseholder you may first need to get permission from your landlord or management company in addition to any other planning and Building Regulations approvals necessary.

Please ask your solicitor to review the terms of your lease in regards to how to approach your Freeholder and for advice on how to obtain the Freeholder approval. We will assist you by providing all plans and specifications your Freeholder needs to grant you the approval.


  • What is a good u-value for bifold patio doors?
  • How are triple glazed patio doors eco friendly?
  • What material for sliding and sliding folding patio doors is the most environmentally friendly for double glazed door or triple glazed doors?

Green Home Glazing offers timber, aluminium and steel frames for all sliding and sliding folding doors we supply for your home.

According to Grand Designs magazine:

“Doors and windows are a critical component in ensuring the sustainability of your project. In an average home, up to 40% of its heat loss is through doors and windows so it’s important to understand the difference between the materials in order to make an informed, responsible choice.

 Energy efficiency and sustainability go hand in hand. Therefore understanding if the timber in your doors and windows is sustainably sourced or FSC certified or whether they are made of a material that can be recycled is as important as their insulation properties (measured by Rvalues) and energy efficiency (measured by Uvalues).”

 Timber frames are always the top option when it comes to sustainability however both aluminium and steel are 100% recyclable materials and this is why we are happy to offer them as part of our product range.

At Green Home Glazing we only offer thermally broken aluminium and steel frames alongside triple glazing as standard for extremely energy efficient bifold patio doors.

To comply with the Building Regulations all bi-fold doors must have a U-value of at least 1.8W/m2. We work closely with our manufacturers and we are able to supply tripled glazed bifold doors with market leading U-values that are as low as 0.9 W/m2.


  • Are bifold doors easy to break into?
  • Is triple glazing more secure?
  • What are the safest patio doors?

Patio doors are often at the rear of the property and this means they are likely to attract the attention of burglars, for this reason security and safety are prime consideration when it comes to any type of bifold, sliding, or concertina patio doors.

Alongside using alarm systems and sensors, it is important that your bifold doors provide a very high level of security, and when compared to French type doors they do.

In order to improve security our double and triple glazed bifold doors can come with the following glazing options:

Toughened – to increase strength and safety, it often comes as standard.

Laminated – to provide additional security compared to toughened glass

Obscure – to improve privacy to windows

In addition to the secure triple glazing our sliding bifold patio doors come with robust secure multi-point locking systems, frames assembled with heavy duty hinges, and finger-safe family-friendly joints for added security and safety.

Why Us

Our offer – We offer triple glazing for the price of double glazing as standard for all quotes across Greater London.

Our full service – Uniquely we offer a full service that includes architectural advice, obtaining all approvals on your behalf, as well as supply and fitting of window and door products.

Our architectural, environmental, and design expertise – By our Architect Director (RIBA Chartered member and registered with ARB), George Omalianakis | GOAStudio London residential architecture limited.

Our construction expertise – By our Builder Director (Federation of Master Builders member), Kia Karamian | Dream Building limited.

Our manufacturers – We work directly with vetted manufacturers which allows us to control the quality, design and cost of the window and door products we will provide for your home.



Our timber sliding doors will provide your home with more light and space, and offer building’s facade unlimited design possibilities. Perfect system functionality and stability that will enhance your life: easy and quiet opening, low doorstep, sliding into the wall or leaning against will protect you from injuries. Also available at extra large dimensions.


– The whole sliding system is covered with corrosion resistant material.
– Low doorstep is convenient for people in wheelchairs.
– Energy saving: thermally insulated profiles and high-quality weatherstrips ensure high thermal insulation.
– Heat transfer coefficient U=0,77 W/m2K – 0,96 W/m2K (depending on the choice of profile system and glazing). (U-value is calculated for the product with dimensions 1230*1480).
– Profile systems: 94mm and 78mm thick.
– Safety: sliding wood doors are completely safe in case of high winds or unexpected drafts.
– High quality weatherstrips ensure insulation against water and cold.
– Additional security components, such as secure lock-able handles, fixed ventilation locking points, create a special protection against burglars.


Today the requirements for security, durability and thermal insulation have increased dramatically. Our Janisol HI steel doors conveniently combine mechanical stability with high thermal insulation properties in one single steel profile system. Thanks to insulating bars made from glass fibre-reinforced polyurethane, Janisol HI achieves Ud values to 1.0 W/m2K.

With a basic depth of 80 mm, infill unit thicknesses of up to 57 mm can be used. A comprehensive and coordinated range of fittings and accessories, as well as a range of thresholds, which can be selected to suit the situation, provide the perfect solution for all possible applications. Thanks to the specially formed insulating bars, the lock can be installed in the centre of the profile very easily and efficiently.




The Janisol folding wall is based on the Janisol thermally insulated system. Flexible in use, the Janisol folding wall system can be used as a room divider as well as for outside areas, and can be inward or outward-opening. A compatible range of fittings and accessories ensures proper, smooth and quiet operation. A range of designs is available for the threshold.

Depending on the size and loading, profiles with a face width of 25 mm or 50 mm can be used. The loadbearing capacity of the top running gear is up to 200 kg, which in turn permits leaf weights of up to 100 kg.




  • A window and door system with thermal insulation, featuring a slim profile line to ensure the maximum light access.
  • The specific shape of the Max Light system profiles (resembling steel profiles) gives the structure a modern industrial character.
  • System application:

fixed windows,

opening windows: single- or double-sash windows with tilting,

opened inwards.

  • Balcony doors inward and outward opening solution is available (threshold options).
  • The Max Light system meets the requirements for the burglary resistance class RC2 for compliance with EN 1627.
  • Available system options: Max Light DESIGN, Max Light INVISIBLE, Max Light MODERN, Max Light STEEL; Max Light – these are a group of systems standing out on the market by their unique design, dedicated to modern architectural designs.
  • Possibility of varnish application according to the RAL pallet (Qualicoat 1518), Aliplast Wood Colour Effect (Qualideco PL-0001), anodised (Quanalod 1808) finish and bi-colour.

Links to our other product range

Traditional timber sash windows
Timber Casement Windows
Sliding Patio Bifold Doors
Aluminium Doors & Windows
Steel Windows & Doors








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