Why Choose Us?

Since 2018

Established in 2018, Knightsmark was born from a conversation between three friends about the vulnerability of the UK property market. We saw a gap between high-end design and high-level security that no one was filling. By combining our backgrounds in Business Management, Engineering, and Design, we created a “triple-threat” approach to protection through the design, manufacture and installation of security doors. We didn’t just want to sell doors; we wanted to engineer a new standard for London living.

Engineering the "Impenetrable Aesthetic"

Knightsmark is built on more than just industry experience; it is rooted in academic discipline. Our founding team holds University degrees in Business Management, Engineering, and Design—a unique combination of skill sets that allows us to approach security from every angle. This blend of technical engineering, aesthetic vision, and strategic management ensures that every project is handled with a level of professional rigour that is rare in the residential security sector.

Knight's Mark Security Doors and Windows

Experience & Innovation

While the company was founded in 2018, our team carries a combined 20 years of expertise in the field. We are driven by a restless commitment to innovation, constantly redefining what it means to protect a home or business. We don’t settle for “industry standard”—we use state-of-the-art technology to ensure our products are at the forefront of the security industry.

We believe an entrance should be both a masterpiece and a fortress. Our solutions are built around three non-negotiables:

construction-of-knights-mark-security-doors-1

True Bespoke Design

No standard sizes and no off-the-shelf finishes. Explore examples of our completed security door designs.

Total Precision

Every door is engineered to your exact specification, meeting the specific needs of homeowners, architects, and developers who refuse to compromise on quality.

Thermal Efficiency

Our products are thermally broken to ensure your home stays as warm as it is secure.

Engineered for Ultimate Protection & Performance

Our products are laboratory-tested to the highest European and UK benchmarks to ensure that security never comes at the expense of performance. Our doors are engineered to RC4 (EN 1627–1630) standards, providing bank-grade protection against determined attacks from professional power tools, while our window systems focus on industry-leading durability. Across our entire range, we subject our designs to rigorous “Hot Box” thermal testing, as well as high-velocity wind, water, and air-permeability trials, ensuring that every bespoke installation acts as a total environmental shield. Whether it is achieving superior U-values or high-level acoustic insulation, our engineering is designed to keep the British elements out and the heat in, though specific ratings will vary based on your individual bespoke specification.

Learn more about how our security doors are made and tested to achieve exceptional performance.

Designed in Partnership

We collaborate with homeowners, architects, and developers who refuse to compromise on the delicate balance between aesthetic beauty and total security. From high-end private residences to complex commercial developments, we understand that an entrance is more than just a functional requirement—it is a statement of intent. By working closely with design professionals from the initial consultation to the final installation, we ensure that every project is delivered to an exacting specification, regardless of architectural complexity. Whether we are partnering with independent architects on bespoke renovations or supporting large-scale developers on prestige builds, our goal remains the same: to deliver an impenetrable finish that feels like a natural extension of the home’s design.

Testimonials, Customer Feedback

Here’s what our customers have to say about their experience with our services – from initial consultation to manufacturing to installation.

Knight's Mark - Security Doors London

4.9

Based on 44 reviews

review us on

Nicola Dennis

1 month ago

Knights mark came recommended to us by a friend.. we went to their showroom and nothing was too much trouble. They had a variety of choices and recommendations for our requirements. The quality is top notch and everyone in the office was a pleasure to deal with. Also the door fitter Rambo a gentleman and gave us top tips and installed the door perfectly! We wouldn’t hesitate in recommending this great local east London security door company!

Dragan Zadro

3 months ago

After month and half searching for the best supplier of our new security door, we decided to come back to the first option, Knight's Mark.
Simply because they left strongest impression to us with presentstion of their doors, also talking with them our confidence in them grows every time after we visited them. Mainly because they did not trying to impress us with promises or flushing images.
Also they give us time to think and to decide.
Finally we ordered new door, waiting time was shorter then we were told it going to be, installers arrived on arranged date and time , and they was really ptofesional. The best thing was door it self, looking stylish, strong, making us feel safe.
All in all, we are very satisfied, having value for our money.
Dragan and Billie.

Jae Gadar

4 months ago

We came across Knights Mark by accident as we were initially looking for a company that was more recognized in the industry. We assumed we would simply get a better service if we went to a established company with thousands of 5 star reviews.

However, when we met Mantas, Dainius, and Viktoria, we realized that this company will be our best option. From the very first consultation to the last fitting, we found the team to be extremely knowledgeable. They helped guide us through the minefield of options, and helped us make the best decisions. Nothing was impossible with them. They have such a positive and professional attitude.

It is rare for me to leave a review. But i feel that Knights Mark deserve this as they were excellent.

I would highly recommend this company to anyone looking for high quality security doors and crittall doors. they are of high quality with competitive prices.

Ozlem Ozdemir

9 months ago

I wanted to thank you and the whole team for the seamless process from start to finish.

First of all, doors are amazing, exactly what I wanted. The whole process has been extremely professional and everything was meticulously planned by your team. There were no surprises and drama. Fantastic!

Barbara Tartamella

1 year ago

I cannot praise this company enough. The doors are exceptional, and the team is incredibly kind and trustworthy. Danius came to my house countless times and delivered a bespoke project to absolute perfection. I would definitely buy from them again and truly recommend them without hesitation.

Julia Sav

2 years ago

Knight's Mark recently installed new doors and windows. From initial consultation to final installation, the team were professional and friendly. Along with unbeatable prices, they offer quality products. The installation was completed on time and the team left everything in order. Very pleased with the results

Crystal P

2 years ago

Absolutely fantastic service from start to finish!

Mantas and team were wonderful to deal with in every sense and most professional. The doors are of superior high quality and look fantastic.

Paul Mcdonnell

2 years ago

Great customer service and after ordering double glazed sash windows they were installed on time and could not be happier with the quality of them and the workmanship. The cost was very reasonable and I would highly recommend this company for products and great service. Many thanks to all staff.

Liz Miranda

2 years ago

I am very pleased with the French doors and two kitchen windows which Knight’s Mark supplied and fitted for me.
The quality is excellent: robust, easy to use and maintain, and very stylish. Communication and delivery were prompt, careful, efficient and pleasant. Thank you!

Marc Alex Taylor

2 years ago

I cannot praise Knightsmark highly enough. From start to finish they were excellent. Mantas and his team spoke to us at great length, spending time to understand what we wanted and offering suggestions which we really appreciated.

We then received detailed plans and had a site visit. After having the door on order we were kept up to date regularly and were supplied with a photo of our door in production.

The fitting team were proficient and friendly, making sure we were happy prior to signing off. Given we are renovating, they managed to still make it look like a really professional finish, better than expected.

We easily have the best house on the street. Thank you Knightsmark!

Antonio Birsa

2 years ago

Being a general contractor, we often deal with various doors and windows suppliers. 4 years ago we were lucky enough to collaborate with Knight's Mark on a project. Since then we have appointed them on almost every project.
Their quality is second to none and their quotes are transparent and highly competitive.

I can't praise them highly enough with Mantas and Dan going above and beyond to ensure that every aspect and minor details are explained and followed by their factory to ensure the highest standard of finishing quality for their products.

Mark Mace

3 years ago

Excellent product and service.
We bought a new front door. Time from order to delivery was exactly as promised. Quality of the product is superb - far superior to all the others we looked at. Also very impressed with the standard of workmanship of the Installation team. Old door taken out and new door installed with virtually no damage to the surrounding area whatsoever.
Highly recommended.

Beatrice Turtenwaldova

4 years ago

Just had my new door installed and I could not be happier. It's beautiful. The service provided by Knight's Mark security door was great. I was contacted a day before the estimated lead time and the door was installed the following week. The fitters were polite, quick and left the house clean. Thank you!!

Take the first step and contact us

Interested in high quality security doors or windows? Reach out to us for a consultation and a free quotation. We’re here to help you take the first step.

Contact us

020 8981 5400

Since 2018

Engineering the "Impenetrable Aesthetic"

Experience & Innovation

We believe an entrance should be both a masterpiece and a fortress. Our solutions are built around three non-negotiables:

True Bespoke Design

Total Precision

Thermal Efficiency

Engineered for Ultimate Protection & Performance

Designed in Partnership

Testimonials, Customer Feedback

Take the first step and contact us