Timber Window Design Ideas: What’s Trending in 2025?

July 15, 2025 | Trade | Written by Nicola Harrison

For developers, builders, and architects, keeping up with the latest design trends is crucial. Homeowners are seeking not just functionality but also aesthetic appeal and sustainable solutions.

When it comes to window design ideas, timber windows have always been a popular choice, combining timeless charm with modern performance. In 2025, several key trends are shaping the world of timber window design.

Bespoke lipped casement window

Flush casement windows: the modern classic

One of the most notable window design trends we’re seeing is the growing popularity of flush casement windows. For years, standard casement windows with their overlapping sashes have been a common choice. However, homeowners are now gravitating towards the sleek, understated elegance of flush casements.

What makes them so appealing? When closed, the sash of a flush casement window sits perfectly level with the outer frame.

This creates a smooth, flat, and minimalist appearance that is a perfect update to traditional casement windows. They offer a clean line that suits both contemporary new builds and period properties, especially those in conservation areas where an authentic look is vital. This design choice contributes to a more refined exterior, allowing the building’s architecture to take centre stage.

Traditional house with white flush casement windows

Slimmer frames: maximising light and views

Another prominent trend in window design ideas is the desire for slimmer window frames. Homeowners want to maximise natural light and create a feeling of openness. Thinner frames allow for larger expanses of glass, which in turn brings more light into living spaces and offers expansive views.

At Bereco, we understand this demand. Our timber windows are crafted from strong, durable European Redwood (Scots Pine), allowing us to achieve remarkably slim profiles without compromising structural integrity or performance. This means you can offer your clients elegant windows that not only look good but also provide superior insulation and security.

Slim timber frames work exceptionally well in:

Floor-to-ceiling windows in sunroom installations
Fixed picture windows that frame an outdoor view
Awning windows where minimalist styling is paramount

Embracing colour and texture: beyond white

Gone are the days when white was the only choice for window frames. While it remains a classic, 2025 is seeing a vibrant shift in colour preferences. Homeowners are embracing the beauty of timber, opting for finishes that highlight its natural grain and texture. Clear finishes and subtle stains are popular choices, allowing the wood’s warmth and character to shine through.

Beyond natural tones, bolder colours are also making their mark. Anthracite grey continues to be a strong contender, offering a sophisticated, modern look that pairs well with contemporary architecture.

Softer greys provide a more understated elegance, while truly bold colours are being used to create striking architectural statements.

Bereco offers a huge range of paint finishes and a variety of mouldings and bars, enabling you to tailor every window to the specific aesthetic of the project.

A house exterior featuring Bereco timber windows with green frames. The upper story is clad in horizontal wooden planks, while the lower story is rendered in light plaster with brick at the base.

Performance meets aesthetics: the Bereco difference

Modern window design is not just about looks; it’s about performance. Trade professionals need windows that meet rigorous energy efficiency and sustainability standards. Bereco timber windows and doors are designed with this in mind.

Energy efficiency:

Our timber, being a natural insulator, combined with high-performance glazing and weather seals, ensures optimal thermal comfort. For those seeking optimal performance, our triple-glazed options achieve U-values from 0.8 W/m²K, 43% better than regulations.

Sound reduction

For properties in noisy environments, our Ambient range offers exceptional sound reduction. Our standard 24mm double glazing provides a sound reduction of 33dB, while specially designed acoustic double-glazed units offer up to 42dB. This is ideal for homes near busy roads or airports, creating peaceful interiors.

Sustainability

As homeowners increasingly prioritise environmental responsibility, it’s important for trade professionals to offer sustainable options. Our timber is FSC® 100% certified or 100% PEFC certified, meaning every piece of wood can be traced back to sustainably managed forests. Choosing Bereco products contributes to significant carbon savings for your projects.

Modern window design ideas: working with Bereco

We understand the demands on developers, builders, and architects. That’s why we offer a streamlined process and dedicated support from initial enquiry to beyond delivery.

Making an enquiry: Simply send us your drawings, specification documents, and project details via email or contact form for an accurate quotation.
Getting a quote: We provide a free, clear, and detailed quotation with full product breakdowns and itemised pricing. Our “best price promise” ensures you get our maximum discounts first time.
Sales confirmation: Once you’re happy, a Technical Project Manager will provide a sales order confirmation, including a full product specification and CAD drawings where required.
Manufacturing and delivery: All our bespoke windows and doors are manufactured in-house. We pride ourselves on a guaranteed 6-8 week delivery time all year round, ensuring your project stays on schedule.

From creating stunning bay windows that maximise natural light to ensuring optimal ventilation with awning windows, Bereco offers bespoke timber window and door solutions for every type of new build, renovation, or conversion project.

A low-angle shot captures two oval timber windows by Bereco set into a light-colored wall, illuminating a stairwell. A wooden handrail runs diagonally across the frame, leading up towards a warm wall light.

Ready to build smarter, faster, and better with Bereco?

Transform your next project with our timber windows and doors. Get in touch with our team to discuss your requirements or request a free, no-obligation quote. We’re here to help you choose the styles that best suit your project and budget, offering support and advice every step of the way.