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About Us

Who we are.

We are ISWUK LTD, formerly known as Interstellar Steelworks Limited. Founded in 2016, based in the South East of England. Our team now consists of over 35 years of combined industry experience.

What we do.

We are specialists in both the interior and exterior design, supply and installation of high-quality glass and stainless-steel design solutions. We cover various applications – balustrades, staircases, viewing platforms, balconies, ramps, entrance canopies, railings, Juliette balconies and much more. All works are managed by our experienced team to ensure; smooth running, the meeting of compliances and building regulations, and a high-standard of finish.

Why we do it.

We are a passionate team that enjoy what we do and take pride in our work. Our experience and skills sets only grow with each project we take on. We are forever innovating and adapting to accommodate the changing landscape around us and everyday challenges faced by those in construction. The most rewarding part of our job is handing over stunning projects and having happy clients who often use us therafter!

What We Value.


Safety in the construction industry is of upmost importance. Safety comes first in all that we do at Interstellar – both for the physical and mental wellbeing of our customers, suppliers and employees.

Honest & Fair

We are honest, open and respectful in our communications both internally and externally. We are fair in our processes, always seeking the facts to provide advice, insight and improvements.


We take full responsibility for our actions, decision making, and all works carried out on projects. We trust our employees to honour our commitments to clients, suppliers, and each other.


Perfection is a result, excellence is a process – from start to finish, your journey with ISW will consist of great performance from our teams and top-quality results on all projects. It is an act of habit.

Going Above and Beyond.

We have been supplying and working with Interstellar for some time now and are always comfortable to recommend them as one of the best installation companies we have come across in the UK for balustrades.

Gary DeanDirector – OnLevel

Working with ISW on this project was a pleasure from start to finish, both in terms of the team and the end product. Site management were particularly accommodating and easy to work with, especially given the challenges a new build site can throw at contractors.

Brielle HillamBusiness Building Project

ISW were appointed quite late in the project due to issues with a previous contractor. Despite this, they were able to mobilise to achieve dates that were critical to the project programme. They were helpful in developing details with both 8build and the architect during the installation process. Workmanship is to a good standard and as a result they have been awarded further fit out work within the same building.

George AdamsConstruction Manager – 8 Build

Working with ISW was a pleasure from start to finish, both in terms of the team and the end product. Site management were accommodating, especially given the challenges a new build site throws up.

Aaron Smart-woodProject Manager – Gravel Rock Ltd

Interstellar were very professional in every way. Hard working, efficient, safety conscious, diligent and polite. The work they installed was not small and needed to be installed in a relatively small confined space. IT was nice to work along side such a professional team who understood the requirements of the customer. I was so impressed with the work carried out I have requested their skills for all future jobs that require their expertise.

SR Carpentry

ISWUK are a valued partner of AliDeck and working with them on 3 Sheldon square, Paddington was a pleasure. ISWUK played an integral role in the design and installation of the decking and other metalworks across the beautiful terrace areas situated in the heart of a bustling Paddington. When 8 Build asked me for one of our best installers on this project, it was an easy decision. The team are incredibly professional and their attention detail and craftmanship is second to none. I look forward to working with the team at ISWUK on our next collaboration.

Louis TaylorSales Manager – AliDeck

I am absolutely delighted with the stairs – they complete my house and are such a wonderful addition. Working with the team at ISW has been stress free and enjoyable; they have been highly professional at all times and have responded quickly to any questions I had during the design, build and installation process. I would have no hesitation recommending them.

SarahBespoke Spiral Stair - Private Residential

Our Clients.

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