Window Design Ideas: Styles and Shapes Explained

New windows are a chance to change the whole character of a house, not just the view out. If you are looking for windows with designs that lift your home's kerb appeal, this round-up walks through the main styles, shapes and glazing details, with a few thoughts on what tends to suit York homes.

Start with the style of window

The way a window opens shapes both its looks and how it works day to day.

Casement windows

The classic British window, hinged at the side or top and opening outward. Casements are versatile, easy to clean and suit almost any home from a new-build to a period cottage. They are our most popular style, and you can see the range on our casement windows page.

Sash windows

The traditional sliding sash, where panes slide vertically, is the signature look of Georgian and Victorian homes. Modern versions give you the heritage appearance with far better draught-proofing and energy performance.

Tilt and turn

A clever continental design that tilts in at the top for secure ventilation or swings fully open for cleaning and escape. Popular in flats and where windows are hard to reach from outside.

Bay and bow windows

A bay projects out in angled sections, a bow curves gently. Both flood a room with light, add a sense of space and create a lovely spot for a window seat. They are a familiar sight on York's Victorian and Edwardian terraces.

Then think about the glazing bars

Glazing bars (the strips that divide a window into smaller panes) are one of the easiest ways to add character.

• Georgian bars: a symmetrical grid of small panes for a classic period look.
• Astragal bars: more authentic bars that sit proud of the glass, giving genuine depth rather than a flat printed line.
• Slimline or contemporary bars: fewer, thinner divisions for a lighter, modern feel.
• Leaded designs: diamond or rectangular lead patterns for a cottage or Tudor style.

Bars are a small detail that make a big difference, especially in conservation areas where matching the local look matters. Always check any current planning or conservation requirements with your local authority before deciding.

Playing with shapes

Not every window has to be a rectangle. Shaped windows draw the eye and solve awkward spaces:

• Arched and round-topped windows for grand or traditional frontages.
• Circular and oval windows as a feature on gables, stairwells or bathrooms.
• Triangular and apex shapes to fill the gable end of a room with a vaulted ceiling.
• Angled and trapezoidal windows to follow a sloping roofline.

Shaped units cost more than standard rectangles, but as a single feature window they can transform a plain elevation.

Decorative and functional glass

The glass itself is part of the design, and it can do more than let light in.

• Obscure and privacy glass for bathrooms and front doors, available in different patterns and levels of obscurity.
• Coloured and stained glass for a heritage or characterful touch.
• Etched or frosted designs for privacy with a decorative edge.
• Low-e and solar control coatings that look clear but quietly improve comfort and efficiency.

You can mix a decorative front-facing window with plainer glass elsewhere to balance looks and budget.

Choosing frame material and colour

Design is not just shape and glass. The frame material and finish set the tone:

• uPVC in white or a huge range of woodgrain and colour foils, a practical, low-maintenance choice. See our uPVC windows.
• Aluminium for slim sightlines and bold modern colours, ideal where you want maximum glass. Take a look at our aluminium windows.
• Heritage aluminium for slim, traditional profiles with almost no upkeep, popular on York's period homes.

Anthracite grey remains a firm favourite as of 2026, but heritage greens, creams and dual colours (a different shade inside and out) are increasingly popular.

Bringing it together for your home

The trick is to let the house lead. A Victorian terrace usually suits sash windows with astragal bars, while a contemporary extension sings with slim aluminium and big panes. There is no single right answer, and mixing styles thoughtfully often looks best. If you are not sure what will work, we are happy to talk it through and put a quote together once you have a direction in mind.

FAQs

What are the most popular window styles in 2026?

Casement windows remain the most popular for their versatility, while sash and heritage-look windows are strong choices for period homes. Anthracite grey and dual-colour finishes are in high demand.

How can I add character to plain windows?

Glazing bars are the easiest way. Georgian or astragal bars, leaded patterns or a shaped feature window all add character, as do coloured frames and decorative glass.

What is the difference between Georgian and astragal bars?

Georgian bars typically create a flat grid effect, while astragal bars sit proud of the glass to give genuine depth and a more authentic period look.

Can I get windows in different colours inside and out?

Yes. Dual-colour or dual-foil options let you have, say, a bold shade outside and a plain white or woodgrain finish inside to match your decor.

Do decorative or shaped windows cost more?

Generally yes. Shaped units, decorative glass and authentic bars add to the price compared with a plain rectangular window, so it is worth getting a quote for the exact look you want.

Looking for inspiration you can hold in your hands? Download our latest brochure to browse styles, shapes and finishes, or request a free quote and we will help you plan.