At Knight's Mark, we design and manufacture custom security doors and windows that blend protection with style. Our products are designed to boost the security of both homes and businesses while enhancing their look. Built with strong materials and advanced technology, our doors and windows provide excellent defence against break-ins, giving you peace of mind and safety.
We offer free, no-obligation quotations to guide you through your project. Our experienced team will not only design and manufacture your bespoke security doors and windows tailored to your needs, but also professionally install them. With over 15 years of expertise, we ensure top-notch quality from start to finish.
Our bespoke security doors combine advanced security with timeless design. Unlike conventional timber entrance doors, every Knightsmark door is built around a fully engineered steel construction—including both the door leaf and frame—before being finished in premium timber. This creates a beautiful entrance without compromising on security. Every door is made to measure and can be customised—or even manufactured to your own design—giving you complete freedom to choose the style, finish, glazing and ironmongery that best complements your home. Whether you’re restoring a period property, creating a contemporary entrance or protecting a high-value commercial premises, every door is tailored specifically to your project.
Our bespoke timber windows combine traditional craftsmanship with modern performance, making them ideal for both period and contemporary homes. Every window is manufactured to order using carefully selected timber and designed to complement your property’s character while delivering excellent thermal efficiency, security and long-lasting durability. Whether you’re replacing traditional sash windows, installing flush or stormproof casement windows, or undertaking a conservation or listed building project, every window is tailored to your exact requirements. With a wide choice of timber species, glazing options and finishes, we create windows that respect your home’s character while meeting modern performance standards.
Our bespoke aluminium windows and doors combine contemporary design with outstanding performance, making them an ideal choice for modern homes, renovations and architectural projects. Manufactured using carefully selected aluminium profile systems, they offer excellent thermal efficiency, enhanced security and long-lasting durability. From aluminium windows, sliding and bifold doors to elegant Crittall-style doors and internal screens, every product is made to measure and tailored to your project. We offer a carefully selected range of aluminium systems, from cost-effective everyday solutions to premium architectural systems with enhanced performance and ultra-minimal designs, ensuring there’s an option to suit every property, specification and budget.
Our bespoke security doors combine advanced security with timeless design. Unlike conventional timber entrance doors, every Knightsmark door is built around a fully engineered steel construction—including both the door leaf and frame—before being finished in premium timber. This creates a beautiful entrance without compromising on security. Every door is made to measure and can be customised—or even manufactured to your own design—giving you complete freedom to choose the style, finish, glazing and ironmongery that best complements your home. Whether you’re restoring a period property, creating a contemporary entrance or protecting a high-value commercial premises, every door is tailored specifically to your project.
Our bespoke timber windows combine traditional craftsmanship with modern performance, making them ideal for both period and contemporary homes. Every window is manufactured to order using carefully selected timber and designed to complement your property’s character while delivering excellent thermal efficiency, security and long-lasting durability. Whether you’re replacing traditional sash windows, installing flush or stormproof casement windows, or undertaking a conservation or listed building project, every window is tailored to your exact requirements. With a wide choice of timber species, glazing options and finishes, we create windows that respect your home’s character while meeting modern performance standards.
Our bespoke aluminium windows and doors combine contemporary design with outstanding performance, making them an ideal choice for modern homes, renovations and architectural projects. Manufactured using carefully selected aluminium profile systems, they offer excellent thermal efficiency, enhanced security and long-lasting durability. From aluminium windows, sliding and bifold doors to elegant Crittall-style doors and internal screens, every product is made to measure and tailored to your project. We offer a carefully selected range of aluminium systems, from cost-effective everyday solutions to premium architectural systems with enhanced performance and ultra-minimal designs, ensuring there’s an option to suit every property, specification and budget.
From bespoke security doors and timber windows to a comprehensive range of aluminium glazing systems, we offer made-to-measure solutions for both residential and commercial projects. Whether you’re looking for contemporary sliding doors, bifold doors, Crittall-style glazing or high-performance windows, we’ll help you find the right solution for your property and budget.
Every project is different. We take the time to understand your requirements and provide practical advice on product selection, security, thermal performance and planning considerations, helping you make informed decisions with confidence.
Our bespoke security doors are built using our own advanced thermally broken steel-core system, developed to deliver exceptional security, thermal performance and durability. Our timber windows and doors are manufactured by carefully selected specialist joinery partners, ensuring every product meets our high standards for craftsmanship, performance and longevity.
Our dedicated installation teams specialise in fitting security doors, aluminium glazing and timber windows, ensuring a precise finish and lasting performance on every project.
Every product is made to order, allowing us to tailor the design, dimensions, materials and finishes to suit your property, project requirements and budget.
We believe our service doesn’t end on installation day. From your first enquiry through to aftercare, we’re committed to providing expert advice, clear communication and ongoing support.
2018
Established
1000+
Bespoke Installations
4.9★
Google Rating
1000+
Residential & Commercial Projects
Feedback from our satisfied customers who have chosen our security doors for their homes and offices.
FREQUENTLY ASKED QUESTIONS
We specialize in a complete architectural glazing and premium entryway portfolio for both residential and commercial properties, including:
We are based in London and provide supply and installation services throughout Greater London and the surrounding counties, including Essex, Kent and Hertfordshire.
We also supply and install our products nationwide and have successfully completed projects across the UK, including Manchester, Birmingham and Yorkshire. Please contact us to discuss your location and project requirements.
Every single product we supply is 100% bespoke and made-to-measure. We do not carry any standard, off-the-shelf stock.
Because everything is engineered entirely from scratch, there are no limitations to your design. We manufacture your windows and doors to your property’s exact structural dimensions, allowing you to completely customize the configuration, opening styles, glazing specifications, and finishes (including any custom RAL color) for a flawless architectural fit and premium performance.
Yes. We have a showroom located in the heart of East London, Bow, close to the beautiful Victoria Park. Our address is 30 Eden Way, London, E3 2JD. The showroom is easily accessible by public transport, with Bow Road Underground Station, Bow Church DLR Station and Mile End Underground Station all nearby.
Paid parking bays available near our showroom.
We recommend contacting us in advance to arrange an appointment so that we can ensure a member of our team is available to discuss your project and answer any questions you may have.
We provide both services to suit your project’s needs. While we highly recommend our complete supply and installation service—where our specialist in-house teams handle everything to ensure flawless structural, thermal, and security performance—we are equally happy to offer a supply-only service.
If you are a builder, developer, main contractor, or a homeowner with your own trusted installation team, we can manufacture your bespoke windows and doors and deliver them directly to your site alongside all the necessary technical specifications
Yes, we regularly work with architects, developers, interior designers, builders and contractors on both residential and commercial projects. We can assist at every stage of a project, from product selection and technical specifications through to manufacture and installation. Whether you are working on a single property renovation or a large-scale development, we can provide bespoke solutions tailored to your project’s requirements.
Yes. In fact, all of our security doors are supplied with triple-glazed units as standard.
For timber and aluminium windows, our quotations are typically based on high-performance double glazing unless triple glazing is specifically requested. However, triple glazing is becoming increasingly popular due to its improved thermal performance, enhanced comfort and additional noise reduction benefits.
Triple glazing is widely used throughout Europe and is an excellent option for homeowners looking to maximise energy efficiency and future-proof their property.
Yes. We provide warranties on our products to give our customers peace of mind and confidence in their investment.
Warranty periods vary depending on the product and manufacturer, but typically include coverage for frames, glazing and hardware. Full warranty details will be provided with your quotation and order documentation.
If you have any questions regarding a specific product warranty, please do not hesitate to contact us.
Knight’s Mark designs, manufactures and installs bespoke security doors, aluminium windows, timber windows and premium glazing systems throughout the UK. Established in 2018, we have built our reputation on combining exceptional craftsmanship, advanced security and outstanding customer service.
We offer fully customised solutions for homeowners, architects and developers. From contemporary entrance doors to traditional conservation windows, every product is made to measure and professionally installed by our experienced team.
With expert advice, detailed design drawings and complete project management, we make the process straightforward from the initial quotation through to final installation.
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