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Origin Doors

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Corner bi-fold doors FAQs

How do corner bi-fold doors work?

Two sets of bi-folds are positioned at 90 or 135 degree angles to each other. The doors fold back in a concertina design, opening up one entire corner of your home.

Corner bi-folds can be installed:

  • with a fixed corner post—a post between the two sets of doors that bears some of the roof’s weight and can’t be moved. However, you shouldn’t rely on the doors for structural support—you would need an structural post in addition to a door with a fixed corner post
  • without a fixed corner post—the doors have a moving post that slides away as you fold them back, as the video below demonstrates

Doors without a post are known variously as ‘floating corners’, ‘moving corners’ or ‘frameless corners’.

How are corner bi-fold doors fitted?

Installing a corner bi-fold door into a property that hasn’t previously had one will require more building work than a standard bi-fold door. We recommend first contacting a structural engineer, so they can provide calculations and advise on when steelwork is necessary.

Often RSJs are needed above both sides of the opening and a structural post is needed in the corner.

If you’re opting for floating corners, you might need additional building work such as a cantilever roof. This typically requires a lot more work and you should consult an architect and structural engineer to ensure you have the required support to accommodate these doors.

What configurations are available for corner bi-fold doors?

Origin’s design and manufacturing process is very versatile, meaning we can build corner bi-fold doors in many different configurations. We can make the doors to fit angles of either 90 degrees or 135 degrees, depending which best suits your home.

How much do corner bi-fold doors cost?

Corner bi-fold doors aren’t much more expensive than other bi-folds, when taken on their own. But as you’ll need additional building and steelwork, there are likely to be some extra costs.

Like with most home improvement projects, the cost depends on your specific needs. Please contact us for a bi-fold door quote.

Is my home suitable for corner bi-fold doors?

Installing corner bi-folds means removing one wall or window and an adjacent wall, so you need to be sure that this won’t compromise the structure of your home.

You can determine this by having a structural engineer do a full survey. They will tell you whether your bi-fold doors need to be fitted with a corner post, or whether a cantilever roof is sufficient.

How does a cantilever roof work?

For floating corners to be structurally safe, you must move the weight of the upper floors and roof away from that corner. Not doing so risks putting too much weight on the door frame—preventing the doors from working—or, worse, your home collapsing from above.

A cantilever roof is used in this instance. Steel beams are installed above the doors to bear the weight that would otherwise have been taken by the removed wall.

Your structural engineer will be able to calculate how much weight needs supporting, and the size of beams required. For the installation, it’s worth hiring a builder who has experience in cantilevered steelwork.

Do I need a building permit to install corner bi-fold doors?

As replacing or adding doors to your home is considered an external change, you will likely need a building permit. However, because building codes vary from city to city and even between neighborhoods within a city, it’s always worth checking with your local planning department.

Related content

Case study—corner bi-folds with a fixed post

Case study—corner bi-fold doors with a moveable post

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