Last Updated on April 25, 2025

What Are French Windows? Everything You Need To Know

If you’re exploring options for new windows that blend elegance, functionality, and enhanced light flow, French windows might just be the perfect solution. But what exactly are French windows? How do they differ from traditional styles? And are they a worthwhile investment for your property?

Whether you’re a homeowner renovating your dream home, a landlord improving tenant satisfaction, or managing upgrades to a commercial building, this expert guide will give you a complete understanding of French windows and why they’re gaining popularity across the UK

What Are French Windows?

At their core, French windows are a pair of casement windows that open outward from the centre without a central post (called a mullion) in the middle. This results in a wider, uninterrupted opening, allowing for maximum ventilation and natural light to flood the room.

Originally influenced by 17th-century French architecture, these windows are now considered a timeless addition to both period properties and modern homes alike.

Key Features of French Windows

French windows aren’t just about looks—they offer tangible benefits that can improve your property’s functionality and even its market value.

1. No Central Pillar

French windows open from the centre, creating an unobstructed view and seamless transition between indoors and outdoors.

2. Enhanced Ventilation

The full-width opening allows for superior airflow, perfect for warmer months or homes that struggle with stuffiness.

3. Elegant Aesthetics

Their symmetrical design suits both traditional cottages and contemporary buildings. They add a touch of European charm while maintaining a clean, minimalist look.

4. Improved Natural Light

With no central bar, these windows welcome more light—ideal for darker rooms or north-facing spaces.

French Windows vs French Doors: What’s the Difference?

Although they share a name, French windows and French doors serve different functions:

• French windows are installed at window height and typically used in upper-storey rooms or above radiators.
  
• French doors are floor-length and often lead to a patio or garden.

Both offer similar design benefits, but French windows are better suited for upstairs bedrooms, bathrooms, and kitchen areas.

Why Are UK Homeowners Choosing French Windows?

The growing trend towards open-plan living and brighter interiors has made French windows a sought-after solution. But there are other UK-specific factors too:

• Building regulations often require windows to function as fire escapes—French windows are ideal for this.
  
• Many UK homes with limited space benefit from outward-opening frames that don’t intrude into the room.
  
• Period properties and listed homes can maintain their classic charm while improving energy efficiency with modern double-glazed French windows.

What Do French Windows Cost in the UK?

Here’s where things get interesting. French windows, while stylish, are also competitively priced especially when compared to sliding sash windows or bespoke options. However, costs can vary widely depending on material, size, glazing, and installation complexity.

If you’re curious about exact prices, don’t guess—check out our in-depth guide on French window costs. You’ll find a complete breakdown of materials, average labour fees, and tips to save money on your next window project.

Understanding the financial side helps you make a smarter, budget-friendly decision. And once you see the range, you’ll know what to expect whether you’re replacing one window or upgrading the entire property. 

If you’re thinking about replacing other windows on your property, be sure to check out our guide on new window costs. It breaks down what you can expect to pay for different styles, including casement windows, sash windows, tilt & turn windows, and more.

French Windows for Landlords and Commercial Properties

French windows aren’t just for domestic use. Landlords benefit from improved tenant satisfaction thanks to more light and airflow without major structural changes. Meanwhile, commercial buildings such as offices or heritage sites enjoy enhanced kerb appeal and potential energy savings with modern glazing.

Additionally, meeting fire egress requirements in rented properties is simplified with outward-opening French windows that qualify as escape routes.

Popular Styles and Material Options

French windows come in a variety of materials, allowing flexibility for aesthetics, budget, and performance.

Installation & Planning Considerations

When installing French windows, always work with a FENSA-registered or Certass-accredited installer to ensure compliance with UK building regulations and insulation standards.

Key Installation Tips:

• Always check the fire egress suitability.
  
• Ensure proper trickle vent integration for condensation control.
  
• Confirm that the frames are thermally broken and fitted with low-E double glazing for best insulation.

How Do French Windows Impact Energy Efficiency?

While aesthetics often take centre stage, modern French windows can drastically improve your home’s energy rating—especially when replacing outdated single-glazed units.

Thanks to double or triple glazing options, argon-filled units, and low-E coatings, today’s French windows help retain heat during the winter while keeping interiors cool in summer.

Get Your Free Window Replacement Quote Today

Whether you’re exploring French windows for a new extension or replacing draughty old frames in a rental property, we’re here to help. Our team works with trusted UK installers to provide accurate, competitive quotes tailored to your property and preferences.

Don’t delay—get your free window replacement quote today and see how much you could save.

Final Thoughts

French windows offer a blend of style, practicality, and versatility that few other window types can match. Whether you’re looking to add value to your property, improve natural light, or simply refresh your home’s appearance, French windows are a brilliant choice.

And remember: when it comes to cost, planning, or installation—the best place to start is with the right information and a trusted quote.