The Different Types of Windows Explained

Window design has evolved over centuries, from traditional sash windows found in period homes to modern slim-profile glazing used in contemporary architecture.

In many renovation projects, homeowners need to balance heritage aesthetics, planning restrictions and modern performance requirements and making the decision can feel overwhelming, so we break down everything you need to know about the most common window styles and frame materials within this guide to help you choose what’s right for your home.

When you choose windows, you’re balancing two essential principles:

• Aesthetic Expression
  Windows define the character of a facade; from timeless heritage to crisp minimalism.

• Functional Performance
  They also influence insulation, ventilation, ease of use and long term durability

Sash windows became widely used in Britain during the Georgian and Victoria periods, when architecture focussed on symmetry, proportion and craftsmanship. Their sliding design allowed windows to be opened without projecting outward, which suited the narrow streets and closely spaced buildings common at the time. Smaller panes of glass were also a necessity, as manufacturing large sheets of glass wasn’t yet possible, which is why sash windows have their distinctive divided appearance. 

Today, manufacturing capabilities and architectural priorities are often different. Contemporary design tends to favour larger panes of glass, slimmer frames and brighter interior spaces. 

Below we’ll explore the key styles, each defined by how it operates and the experience it creates.

Casement windows arrived in the UK during the 18th century, and quickly became of the most popular designs.

Due to their outward opening hinged design, they are perfect for drawing in fresh air and enjoying expansive open views. On top of this, their snug fit and compatibility with high-performance glazing means that casement windows can achieve excellent energy ratings.

From a design perspective, they can be crafted in UPVC, aluminium or traditional timber which allows them to be styled to reflect anything from minimalist modern to authentic heritage looks.

Why Choose Them?
They are a great all rounder with great airflow, thermal performance and unobstructed views.

Best Suited to:
Most homes due to their huge popularity, they look equally great in period homes as they do in new builds.

Tilt & Turn windows are very popular across European-style homes. They are designed to open in two ways; tilting inwards slightly from the top for a gentle breeze or opening fully from the side when you want maximum airflow.

Because they open inwards, they’re easy to clean from the inside in homes which is particularly useful on upper floors or in flats. When closed, they form a tight seal against the frame helping keep our draughts and maximise thermal performance.

Typically, Tilt and Turn windows are better suited in contemporary homes due to their simple lines and functional feel, however they can be integrated into classic homes.

Why Choose Them?
A great choice for homeowners who prioritise safety and flexible ventilation, particularly in flats or higher floors where inward-opening windows are more practical.

Best Suited to:
Homes with modern and contemporary design.

Bay windows are easy to spot thanks to their distinctive shape. They are typically made up of three glazed sections, a large central pane and two small angled windows on either side, which may be fixed or openable. This projection not only brings in more natural light, but also gives homeowners the opportunity to enjoy wider views and even create a cosy seating area inside.

In modern architectural projects, traditional bay windows are sometimes replaced with contemporary alternatives such as oriel windows or structural glass projections. They can transform a room through their ability to amplify natural light and broaden the view.

Why Choose Them?
They create extra interior space and they can add curb appeal and positively influence property value.

Best Suited to:
Victorian and period homes, along with new builds aiming to create a sense of character and charm.

Oriel Windows are a type of bay window that extend from a wall and don’t fully reach the ground. Traditionally they were supported by decorative brackets or corbels, and became particularly popular during the medieval and Tudor periods. Because they extend from the wall, you often find Oriel Windows on the upper stories overlooking streets or gardens where their elevated position offer excellent views.

Why Choose Them?
They add architectural character and maximise natural light while creating the impression of increased interior space.

Best Suited to:
Period and heritage-style properties as well as contemporary homes looking to integrate a striking feature.

Slim profile windows are designed to maximise glass creating a clean, elevated appearance that allows light and views to take centre stage. Their understated design makes them fit in seamlessly with contemporary homes and architectural projects where simplicity and proportion matter.

Why Choose Them?
They bring in more natural light, create uninterrupted views and deliver a sleek, modern aesthetic that compliments both new builds and design-led renovations.

Best Suited to:
Contemporary homes, extensions and architectural projects where clean lines, minimal detailing and a strong connection to outdoors is a priority.

Rooflight and skylights are designed to bring natural light into spaces where traditional windows aren’t possible, such as lofts, extensions or rooms positioned away from external walls. Installed within the roof, they completely transport a space and allow daylight to reach deeper into the home, helping interiors feel brighter, more open and better connected to the outside.

Why Choose Them?
They maximise natural light, enhance the sense of space and provide a clean architectural solution for brightening an area that standard windows can’t reach.

Best Suited to:
Loft conversions, extensions and modern homes where increasing daylight and creating a more open, airy feel is a priority.

Sash windows remain a defining feature of many Georgian and Victorian homes. However, in modern renovations they are often upgraded to more contemporary designs to improve the appearance and brightness of homes. However, in listed buildings or conservation areas it may not be possible to change the external look of the window, in which case it’s worth speaking to a glazing specialist.

Why Choose Them?
They’re one of the UK’s most enduring and admired window styles, and bring an element of classic charm to any property.

Best Suited to:
Georgian, Victorian or Edwardian homes, conservation areas or renovation projects where preserving the original look and feel of the property is a priority.

When it comes to windows that genuinely elevate a home, Fluid Glass windows stand apart. With slim profiles, refined detailing and a focus on architectural clarity, they allow light to flow naturally while complementing the overall design of a space. 

Engineered for strong thermal performance, durability and everyday usability, they offer the perfect balance of aesthetics and function that works across both modern homes and carefully considered renovations.