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Frameless Glass box extensions

About fineline doors

Frameless Glass Extensions with Sliding Doors

Fineline Doors stands out as the exclusive London-based provider of structural frameless glass conservatories, offering a diverse array of fineline frameless door solutions seamlessly integrated into your frameless structure.

The Infiniti Fineline sliding door, distinguished by its slender 17mm sightlines, empowers designers and architects to envision glass room structures with distinctive opening solutions without sacrificing the elegance of fine lines. At the forefront of designing frameless structures, we integrate optimal solutions, ensuring that your structure not only stands out but also remains unparalleled in its visual appeal and functionality.


What Our Clients Say About Us

Creating elegant, structurally unique and safe Glass Extensions throughout the UK.

“The Fineline team delivered our glass boxes in almost impossible timeframes which meant the laser survey and design process was condensed into a very short period of time so that the glass could be ordered. The construction of our glass boxes was then completed to programme with no delays. The product delivered is of exceptional quality and they now offer unique lounge spaces for our guests to enjoy the gardens throughout the year. Thank you to Andrew and his team. Neil Kedward, Managing Director, Seren Collection”

Neil Kedward
Google Review

“Fineline Doors designed and delivered a glass extension to our house and we can’t be more happy with the way it turned out. The product itself is very nice – the glass beams and finish are excellent. The insulation is amazing too – we were a bit worried it would be cold but it works exactly as advertised – not too cold in the winter, not too hot in the summer. The installation was performed by an excellent team, led by Tyler who really knows his stuff. All in all I wouldn’t hesitate to recommend this company.”

John Simmons
Google Review

“Fineline provided me with 3 arched, 2.6m high steal Crittall style doors to the rear of our house and aluminium crittall style windows to our extension and more. We are delighted with the results and the compliments keep coming. Andrew has been a delight to work with and his attention detail very comforting. Highly recommend Glasspace. A glass extension is next and we will definitely be speaking with Andrew, having seen the his previous very extensive projects.”

Google Review

How It Works

Fineline and its team work hard to make the process of adding a new bespoke glass extension to your home or commercial building as easy as possible.

At Fineline Doors we encourage you to take advantage of our complimentary design consultation with an advisor.


Laser scanners give a exact indoor or out door measurement in three dimensions “At your fingertips”

Concept Design

Using the latest 3-dimensional solid modelling and CAD systems, we produce computer-generated images 


All structures are tailor-made to your chosen design, and once the raw materials the aluminium frames will be custom extruded


Your bespoke structure will be installed by our own team of highly skilled fitters / engineers at your location


Our team will ensure your project is completed to the highest level of quality and maintenance will be available

About fineline doors

Our Glass Room Extensions

At FineLine Doors, our expertise lies in crafting, designing, and installing personalized glass room extensions and frameless glass conservatories. Our design approach is meticulously tailored to meet your specific needs. Elevate your living space and enhance your culinary and entertainment experiences with a custom-designed glass kitchen extension.

The construction of our home glass room additions involves the use of frameless glass panels, ensuring your home receives abundant natural light. The result is a contemporary and refined architectural glazed extension, providing your home with optimal exposure to the outdoors.