Flush Casement Windows

Nine Zero - White Timber Casement Windows

Our bespoke timber casement windows combine timeless elegance with cutting-edge functionality, a sleek and versatile solution for both period and contemporary properties.

At Nine Zero, we specialise in flush casement windows that honour traditional aesthetics while delivering energy-efficient performance and robust security.

Working with developers, architects, and installers, every window we produce is tailored to a home’s exact specifications, handcrafted by experts, and beautifully made to stand the test of time.

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What are casement windows?

Casement windows are side-hinged windows that open outward like a door, typically operated with a handle or crank. They’re known for their clean lines, wide openings, and excellent ventilation, making them a popular choice for both traditional and modern homes.

There are two main styles: standard casement windows, where the sash slightly overlaps the frame, and flush casement windows, where the sash sits level with the frame for a smoother, more minimalist finish. Flush designs are especially desirable in heritage properties or where a sleek, understated appearance is preferred. Understanding what casement windows are can helps narrow your layout options.

Why choose flush casement windows from Nine Zero?

Every flush casement window is handcrafted to order by skilled craftspeople at our manufacturing site in Cornwall, where they blend traditional joinery techniques with modern performance.

From classic bars and decorative mouldings to thoughtfully selected glazing options and ironmongery, every detail is refined to suit you or your client’s style.

Built from FSC-certified wood, our casement windows reflect our commitment to sustainability, beauty, and longevity. We’ve blended the best of traditional craftsmanship with cutting-edge insulation, acoustic performance, and security, creating windows that are practical and elegant.

Flush casement technical information

We provide detailed technical packs for all our timber windows, including CAD drawings, specifications, and data sheets – available to download by product or as a complete collection. These resources are designed to support you with your project, helping you make confident, well-informed decisions during the planning and design process.

Whether you’re specifying for a heritage property or coordinating a new build, our technical documentation ensures clarity at every stage.

Download our brochure

To explore our range of sustainable timber windows and doors and imagine the possibilities for your project, fill in the form to download our brochure now.

Bespoke

Crafted for individuality, Nine Zero casement windows reflect bespoke heritage charm tailored for contemporary performance.

Secure

Enhanced flush casement window security means Document Q and PAS 24 compliant, multi-point locks, and internally beaded glazing.

Sustainable

We use FSC-certified sustainable materials, recycle timber waste, and supply renewable energy to local communities as just a small part of our plan.

Quality

Using Engineered Redwood, Engineered Red Grandis and Abodo sustainable timber wherever possible, our products are made from the highest standard renewable wood.

Insulated

Wood casement windows are a natural insulator with little thermal conductivity, offering U-values as low as 1.0 W/m2K and reduced energy bills.

Easy clean

Timber casement windows feature low-maintenance design, simple frames and durable finishes for effortless cleaning and minimal maintenance.

Weatherproof

Resilient and built to last in all climates, Nine Zero casement windows meet BS 6375:2015 Parts 1 and 2 regulations for weathertightness.

Partnering with developers on bespoke casement window projects

We offer a collaborative approach to our larger trade projects, with in-house design, manufacturing, and delivery. From heritage renovations to high-end new builds, our team is there to meet all of your supply needs.

Our work with developers

Bespoke designs for any property

We work closely with owners, architects, and developers to create windows that complement the property’s style, purpose, and planning constraints. Whether you’re matching the precise look of an existing window or designing something entirely new, our team ensures every detail is tailored to your brief.

Our bespoke approach makes us the perfect partner for homes in conservation areas, where sensitivity to original design is essential. From traditional mouldings to custom glazing layouts, we bring your vision to life while meeting the highest standards in craftsmanship, compliance, and aesthetics.

How secure are casement windows?

Timber itself is a naturally robust material, and we enhance this with high-performance locking systems, durable hardware, and secure glazing options. Whether you’re upgrading an existing home or specifying for a new build, our casement windows offer lasting peace of mind without compromising on design.

Our timber casement windows are designed and manufactured to meet PAS 24 standards and are fully compliant with Document Q for new dwellings, offering full confidence in their strength and resistance to forced entry.

Glass, hardware and colours

Nine Zero timber windows and doors come to life with our wide range of glazing options, designed to meet your specific requirements. Choose from slimline glazing ideal for historical restorations, and advanced acoustic glass to soften city living and create a tranquil home.

Style to suit with our extensive hardware selection, including sleek lifts, secure locks, durable fasteners and smooth pulleys in various finishes – all supported by our reliable 5-year warranty.

Mix or match with any colour scheme by choosing any RAL or heritage F&B shade, all guaranteed with a 10-year assurance on our expertly-painted finishes.

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Our guarantees and warranties

Every wooden casement window comes with a 30-year guarantee on the timber itself, along with a 10-year warranty covering workmanship, glazing, and paint finishes. These guarantees reflect our commitment to durability, performance, and exceptional standards.

As with all high-quality timber products, longevity depends on correct installation and simple but regular maintenance of the surface coatings. We provide clear care guidance to help your clients get the most from their investment for decades to come.

To learn more, please visit our Warranty page.

Warranties

Contact us for a quick quote

Speak to our team of timber window specialists and bring your vision to life with a tailored, expert-led solution. Whether you’re planning a renovation, restoration, or new build, we’re here to help. Request a quote or book your consultation today.

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FAQs

Can you match my home’s existing window style?

Absolutely. We specialise in custom-made joinery and can match existing profiles, mouldings, glazing bars, and finishes to ensure a seamless look that complements your property’s character.

How long does the manufacturing and installation process take?

Lead times can vary depending on the complexity and scale of your order, but most projects take between 6 to 8 weeks from final design approval to installation. We’ll provide a clear timeline during your consultation.

Where does Nine Zero work?

We work with homeowners, architects, and developers across, Greater London, Surrey, Hampshire (particularly Winchester), Bristol, and the wider South West area (particularly Gloucestershire and Somerset).

Sustainability

Environmental consciousness and sustainability are essential if we are to preserve a healthier planet for future generations. That’s why we’ve made a significant commitment to eco-friendly practices by establishing Nine Zero in the heart of Cornwall.

Since 2017, drawing on over 15 years of supplier expertise from our sister company Sash Windows London, we’ve set the bar for sustainable timber windows and doors. This was more than just an expansion; it represents our unwavering dedication to meet the growing demand for green building materials, while upholding the premium quality and unparalleled expertise that our customers have come to rely on.