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0208 397 8636

Bespoke timber windows and doors for commercial and residential projects

From heritage conservation projects to contemporary new builds, we make bespoke timber windows and doors in Cornwall, combining traditional craftsmanship with modern performance and reliable delivery across the UK.

Our range includes sash and casement windows, plus sliding, bifold, French, and panelled external doors, all made to your specification using FSC-certified timber.

Whether you need single doors or complete window and door packages, our team can support you from specification through to delivery.

Working with you
Working with developers
Our installers network

Why choose Nine Zero for timber windows and doors?

With roots in Sash Windows London, established in 2005, Nine Zero brings decades of window, door, and construction experience to every project. Our products combine the character and detailing expected of traditional joinery with the security, thermal efficiency, and durability required from modern wooden windows and doors. For trade partners, that means bespoke products backed by technical expertise, clear communication, and dependable project support. For homeowners, it means beautifully crafted joinery designed specifically for their property.

Made in the UK

Made in the UK

Our timber windows and doors are crafted in Cornwall by skilled joiners and craftspeople. Combining specialist knowledge with modern manufacturing technology allows us to produce bespoke joinery efficiently while maintaining consistent standards across projects of different scales.

Our guarantees

Our guarantees

Specify with confidence. Our timber products are supported by a 30-year warranty against rot and decay, alongside 10-year guarantees covering manufacturing and painted finishes.

Sustainable timber

Sustainable timber

FSC-certified materials sit at the heart of our manufacturing process. We recycle our timber waste and continually look for ways to minimise waste and energy use without compromising product quality or performance.

Premium materials

Premium materials

We work with carefully selected timbers, including Engineered Redwood, Engineered Red Grandis, and Abodo. These durable materials allow us to create everything from traditional wooden panel doors and sash windows to contemporary sliding patio door designs.

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.

    Our Products

    Box sash windows

    Box sash windows

    Both traditional and trending, our FSC-certified timber box sash windows enhance authentic period properties and improve ventilation.

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    Flush casement windows

    Flush casement windows

    Sleek and seamless sustainable timber flush casement windows fit with modern and traditional architecture, while offering superior thermal efficiency.

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    Entrance doors

    Entrance doors

    Custom-sized, high-performance timber entrance doors and timber french doors with top-tier security, crafted to Secured by Design specifications.

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    Bifold doors

    Bifold doors

    Timber bifold doors designed and build around your space and aesthetic needs

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    Spring sash windows

    Spring sash windows

    Classic in style, our timber spring sash windows have double sprung balances for smoother operation and up to 75% mechanical advantage.

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    French doors

    French doors

    Secure, stylish and multifunctional timber French doors, handcrafted from the highest quality renewable wood.

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    Sliding doors

    Sliding doors

    Our secure sliding doors create a seamless transition between indoors and outdoors.

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    Glass, hardware and colours

    We offer a comprehensive selection of glazing, hardware,  and finishes, giving trade partners, specifiers, and homeowners the flexibility to achieve the required appearance and performance. Our glazing options include slimline solutions suited to sensitive restoration projects alongside acoustic and performance glazing for contemporary applications.

    Choose from a broad selection of locks, fasteners, lifts, pulleys, and other hardware in a variety of finishes, supported by a five-year warranty. Products can also be finished in virtually any RAL colour or heritage Farrow & Ball shade, with our expertly applied painted finishes covered by a 10-year guarantee.

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    Get a free Quote Online or call - 0208 397 8636

    Request a quote

    Technical support for your project

    Our technical team can provide detailed CAD drawings, product information, and practical guidance to help you specify the right solution for your project. Every profile and component is carefully considered for durability, performance, and ease of integration. 

    Whether you’re specifying a traditional timber casement window, matching existing joinery, or incorporating contemporary bifold wooden doors into a new development, our team can help you work through the technical details.

    Explore our CAD drawings and technical resources below, or speak directly with Nine Zero for advice on your specification.

    Datasheets and technical drawings

    Case Study - St John's Wood, London

    Our team worked with Morgan Rae on windows and doors for an ambitious conversion project in London. Renovating a former Police station building, we worked closely with their team to deliver bespoke products that met their exact specifications in terms of colour, size and design. Read the full case study to find out more.

    Read the case study

    Become a Nine Zero trade partner

    Help us to help you. Nine Zero trade supply partners get personalised service, preferential rates, marketing support and direct access to our expert team. Email accounts@nine-zero.co.uk to find out more.

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    Team Nine Zero

    Behind every project is a team with decades of combined experience across joinery, windows, doors, and construction. From initial enquiries and technical specifications to production and project support, you’ll have knowledgeable people available when you need them.

    Laura

    Laura

    Floor Supervisor

    Chris

    Chris

    Company Partner

    Alicia

    Alicia

    Head of Marketing

    Francesca

    Francesca

    Sales Director

    Lucy

    Lucy

    Office Manager

    Steve

    Steve

    Company Director

    Get a quote for your project today

    Looking for a reliable supply partner for bespoke wooden doors and windows? Nine Zero works with installers, architects, and developers to deliver made-to-order timber products. These are all backed by responsive technical support, competitive upfront pricing, and dependable lead times. 

    We also work with homeowners intending to hire their own architects and installers, and who are looking for carefully tailored windows and doors for high-quality renovation and new-build projects.

    Send us your project requirements, and our team will help you establish the right specification and provide a clear quote.

    Contact us

    Advice

    Do I need planning permission for bifold doors?

    Bifold doors are one of the most transformative additions you can make to a home. They open up entire walls to natural light, connect living…

    Read More

    What are French doors, and why should I choose them?

    Few architectural features create the same sense of light, symmetry, and quiet elegance as a pair of French doors. They frame garden views, soften the…

    Read More

    How to adjust bifold doors

    Bifold doors (sometimes written as “bi-fold) are designed to glide effortlessly, opening up your home to light, air, and uninterrupted views. When they’re working as…

    Read More

    What our clients say

    “Our building is in an ANOB, world heritage site, and an SSSI. We wanted windows that would look authentic, were affordable, and would meet the challenges of a coastal location – saline air, high UV, and strong winds. The material had to withstand corrosion, be adjustable over its lifetime, and, with normal maintenance, last 30 years or longer. We considered plastic and aluminium windows but were not convinced they could meet the criteria.

    We decided on Nine Zero after visiting the workshop in Cornwall and meeting the team. Communication was important in determining the design and final detailing of the windows. We were happy with the process and the resulting windows look great.”

    James Burton, Director, Bere Property Ltd

    “Nine Zero were recommended to us by a local timber business owner for lead time: the order process was simple, people were friendly on the phone, and we were delighted with the quality. A friend who has 35 years’ experience of running a high-end timber business was also very impressed.”

    Mr Nick Denman, Hastings, England

    "What drew me to Nine-Zero was the product, and that its manufactured in the UK, it quickly became about the people as much as the product! The personal touch, the close-knit team of people who know what they are doing and the consistent service levels."

    Elliott Martin, Oxford Trade Frames Ltd

    "We recently had our windows replaced and couldn’t be happier with the results. The fact that they’re made right here in the UK, in Cornwall was a big plus for us — it’s great to support local craftsmanship. The quality is outstanding, with a solid, well-finished look and feel. In addition, the delivery went smoothly with no issues whatsoever. Highly recommend this company for anyone looking for reliable, high-quality timber windows made close to home."

    Florence Holzapfel

    "Nine Zero offered beautiful, yet affordable timber windows and doors and were able to customise a few trickier fitouts that other suppliers couldn't. What stood out most was their knowledge and support in making non-standard items work in line with the architects' drawings."

    Ketie van der Wateren, Co-founder, flow design & manage

    "What stood out most about Nine Zero was their attention to detail and the level of support we received from day one. Steve and his team were, proactive, transparent, and genuinely invested in helping us & the client team get the best result. Every interaction felt collaborative — he listened carefully, offered expert advice, and delivered exactly what they promised. The service is the very least we expect from a subcontractor or supplier & Nine Zero understood this from the outset."

    Sandra Phaup, Head of Design, Morgan Rae Ltd
    • Secured by Design Logo

    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.

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