French, Sliding or Bi-Folds: A Practical Guide to Patio Doors

Patio doors are more than a style choice. For installers, they bring different fitting needs, performance issues, and client expectations. From classic French doors to modern sliders and premium bi-folds, knowing the pros and challenges of each system helps you:

• Advise customers with confidence
• Plan installations more effectively
• Deliver smoother projects with fewer call-backs

French Doors

French doors are a timeless option and a staple of the market. Their symmetrical double-door design swings open from the centre, making them instantly recognisable.

Why customers choose them:

• Classic look, perfect for traditional or period homes
• Most cost-effective option, especially in uPVC
• Easy to install compared with sliders or bi-folds
• Suitable for smaller openings

Installer tips:

• Confirm opening direction early (inward vs outward).
• Inward can clash with furniture.
• Outward needs patio space.
• Check threshold detailing for a flush finish to avoid trip hazards.
• Fit weather seals carefully to prevent draught complaints.

Sliding Patio Doors

Sliding doors are sleek, space-saving, and maximise light and views. They typically include one fixed panel and one or more sliding panels on a track.

Why customers choose them:

• Great mid-market option (balance of cost and performance)
• Do not swing open – ideal for smaller rooms
• Minimal sightlines and large glazed areas
• Ultra-slim aluminium profiles now dominate the market

Installer tips:

• Remind clients the clear opening is limited to the sliding panel (often 50% of the aperture, unless multi-track).
• Use high-quality tracks and runners to avoid stiff, heavy doors.
• Choose A-rated, thermally broken aluminium frames to prevent cold bridging.
• Plan for large, heavy panes – mechanical lifting may be required.
• Get drainage detailing right at the track to prevent water ingress.

Bi-Fold Doors

Bi-fold doors are the premium choice and a true “wow factor” feature. Multiple hinged panels fold and slide to one side, opening the wall almost completely.

Why customers choose them:

• Perfect for modern, open-plan living
• Full indoor–outdoor flow
• Configurations from two to seven panels
• Options to open left, right, or centre split
• Hybrid slide-and-stack variations available

Installer tips:

• Allow space for stacked panels and confirm this during design.
• Coordinate early with builders/engineers – wide openings often need RSJ support.
• Plan for panel weight and site access.
• Build in extra time for adjustments. Clients paying premium expect perfect operation.
• Fit carefully:
• Panels must be square and aligned
• Compression gaskets and perimeter sealing are essential
• Threshold drainage needs close attention
• Multi-point locking and track alignment must meet manufacturer tolerances

Helping customers choose

As an installer, you’re not just fitting doors – you’re guiding clients to the right solution. Discuss these points with them:

• Property type: Period homes often suit French doors. Contemporary builds favour sliders or bi-folds.
• Space available: French doors need swing clearance. Bi-folds need stacking space. Sliders save space.
• Budget: French = most affordable, sliders = mid-range, bi-folds = premium.
• Energy efficiency: Low U-values prevent condensation and draught complaints. Higher cost upfront, but savings long-term.
• Practicality: Ask how often doors will be used.
• Daily use, choose sliders or French doors
• Seasonal use, choose bi-folds
• Aftercare: Remind clients about maintenance (cleaning tracks, checking seals).

In conclusion

The best patio door depends on the project and the customer’s priorities. Your expertise makes the difference:

• Choosing the right system
• Getting thresholds, sealing, and drainage right
• Planning ahead for weight, site access, and finish

By understanding each door type, you’ll reduce snagging, win trust, and deliver installations that look great and perform reliably.

We hope this article has helped you understand more about patio doors, and how which patio door would be perfect for your home. This article was collaborated with Quickslide.

If you have any more questions about patio doors, would just like to know more about the products we sell at Howarth, we offer helpful advice from our Customer Service team who may be able to advise you further, and you can contact them on the number 01472 907051.

Or if you’re interested in checking out our wide range of door products, you can access the category here, and you can visit us in branch for more information.