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Welcome to Windows by Design Ltd

We are dedicated to providing a wide range of professional services, which include: replacing your windows with high quality uPVC or Aluminium Double Glazed Windows, fitting Doors in either uPVC, Composite or Wood. Supplying and installing: Bi-Fold Doors, Conservatories, Orangeries, Aluminium Roof Lanterns and the Guardian Warm Roof.

We pride ourselves on our consistent level of craftsmanship, our pleasant, polite approach, our commitment to providing unlimited levels of customer service and most of all, our general attitude, which means you’ll always get our best help, advice and support.

When it comes to the products themselves, we can promise that security, energy efficiency, modern design and use of the very latest technology is absolutely guaranteed.

Find out what else we do

Installation takes just a few days

We've created a very short video animation to show you how we install the Guardian™ roof system…


Roof Lanterns

The perfect solution for any flat roof.
Enhancing the light into theroom.

Roof Lanterns

PVCu Double Glazing

Tailor-made to suit your requirements,
no matter how unique or unusual.

PVCu Double Glazing

Get more from your conservatory…

Transform your downstairs living space by replacing your existing conservatory roof with a new lightweight, fully insulated, beautifully finished; Guardian Warm Roof.

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Your home improvement specialists

A small change can make a big difference, you don’t necessarily need to spend a fortune, in order to improve your surroundings, we can help you to make the most of your home and the way you use it…here are just some of our excellent product range:

Bi-fold Doors



Free home survey

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  • The Guardian™ roof

    The lightweight, insulated Guardian™ roof system was designed and developed over a ten year period and with one purpose – to replace the typical glass or polycarbonate roof that was used in the construction of most UK conservatories.

    The main focus was on the dynamics and performance, however the overall weight of the replacement roof, which needed to be installed onto the existing conservatory windows, doors and frames was always a big priority. During this period extensive tests were carried out both for compliance and approval to very vigorous structural and thermal standards. The result is not only a brilliant product but a very practical solution, one which has been the biggest home improvement.

  • A bit about us?

    We pride ourselves on fitting only the highest quality, secure, energy efficient window and door systems in UPVC, wood and Aluminium. Our team are here to listen to what you want and don’t waste your time with long sales presentations.

    Windows by Design, Swindon have carefully selected teams of double glazing door, conservatory and window installers who consistently deliver a high level of service that you can rely on, you can be sure that your home will always be treated with a great deal of respect.

    From your very first idea to the completion of your installation, we will take away all the stress and provide a service from start to finish that runs smoothly. We pride ourselves on our fantastic testimonials.

  • Help and Support

    The result of all the research and development is not only a brilliant product, it’s a very practical solution and one that home owners all over the UK are now enjoying. In fact, the Guardian™ Warm Roof is possibly the biggest revelation to hit the home improvement market for years.

    As you would expect from the suppliers of a brand new leading product, we are able to offer a full supporting back-up service and assistance with any questions or issues you may have. From building control approval, right through to the full installation procedures, we are here to help provide the answers and information you need.

    Thousands of conservatories in the UK have been transformed into home extensions thanks to Guardian’s™ replacement warm roof and on top of that many new conservatories are being specified with our lightweight, insulated product. It really is a win-win situation, home owners get a more comfortable environment and lower heating bills. What are you waiting for?