Welcome to Colin’s Sash Windows


Colin’s Sash Windows draws upon over two decades of experience. This comprehensive experience means that we know how to provide first class service our customers.

Servicing both trade and retail, we sell made to measure uPVC windows supply only. Each window utilises the finest materials and is the height of innovation. The quality of our windows is unsurpassed – you won’t be disappointed. We have never had a complaint about the quality of our windows.

As one of the best sash windows suppliers and customer-centric business, we offer an unrivalled service. No matter what your requirements, we will deliver a window that is as functional as it is aesthetically appealing. On time every time.


Whether you want 1 window or 100, every order is important to us and you will receive personal attention.

Our window craftsmanship is second to none. This is evident from the moment that you first see your window. This is what sets us apart from the competition – intricate attention to detail.

To discover how we can fulfill your personal requirements with ease or to make any enquiries, call us today on 01525 552131

One of the UK’S Biggest online Windows Retailers

Virtually any size for the same price.

Any property needs character. It’s those small features that leave a lasting impression and make the environment all the more inviting and accessible. One feature that will surely add functionality and that eye-catching aspect are windows. We Export all our products worldwide.

We have got 4 unbeatable offerings for you. Check the videos to see each window.

The UK’s best Premium Mechanically Jointed Upvc Sliding Sash Window. Because of our volumes you can save £100’s per window compared with our competitors. Deep bottom rail & run through sash horns as standard. If you like timber windows but don’t want the maintenance this is option for you.
Our basic 7 Day Upvc Sliding Sash Window available in around 7 working days for an unbelievable £249 plus VAT for virtually any size.
Fabulous hardwood or softwood timber Sliding Sash Windows with traditional cords and weights or balance sprung, fully painted, double glazed and ready to fit at prices you won’t believe.
Synseal Evolve Upvc Sliding Sash Window. Again £249 plus VAT for virtually any size but with many more options including run through horns and Secured by Design. Sashes and frames strengthened with galvanised steel.

Stylised Character

Colin’s Sash Windows has a range of windows that will enhance any environment. Adding that stylised, tailored element to any home, our windows allow you to customise any colour to mirror the decor of the property.

Our Approach

Our ethos is to offer a customer-centric experience that exceeds even the loftiest expectations. Whether you require multiple windows or just one, our approach ensures that your vision is fulfilled. DELIVERIES FROM 7 WORKING DAYS.

Comprehensive Experience

We have a dedicated team with over twenty years experience. With our commitment to providing the foremost levels of customer service, and the knowledge that comes with such vast experience, we will complete all orders on time – at a price that cannot be beaten.

Safe and Secure

All our windows come with toughened glass as standard, they are internally glazed, have sash locks and travel restrictors as standard. We can also supply them to conform with fire regulations at no extra cost.

Aesthetic Functionality

We offer a wealth of different finishes for you to choose from. Select the design and colour look that moulds perfectly into your environment. The craftsmanship of our windows is second to none. Unlike traditional sash windows, our windows not only slide up and down, they tilt inwards so you can clean the outside.

Environmental Benefits

Our windows will dramatically reduce condensation. You’ll also notice a huge noise reduction. As standard, they are A rated so they are kind to the environment too. Get in touch with us today to receive a competitive quotation. Alternatively, if you’d like to ask us any questions please get in touch!


  • Nina Keats
    I would not hesitate to recommend this company. Colin responded immediately to a telephone enquiry about pricing and technical information. The company then followed up within 24 hours with a detailed quotation for 47 box sash windows in varying sizes and configurations. Their price beat all other so-called ‘trade’ prices that we had received for the same Synseal Evolve box sash windows. Within a fortnight, the windows arrived for our builder to install. Despite being the cheapest, their service has been absolutely faultless.
    Nina Keats
  • Ray Corey
    Bought 4 sash Windows. I was concerned about the quality as the price was reasonable, but after fitting them myself they look fantastic, good quality and perform very well. The windows are in Chartwell, green wood effect UPVC, they look as good as timber windows, can't tell the difference until you get close. I would recommend Colin's Sash Windows to any one!
    Ray Corey
  • Caroline Bernstein
    I just wanted to say how happy we were with our new UPVC window from Colin's Sash Windows. The whole process was so easy from ordering to delivery. Colin and his team were really helpful and very professional. The window was beautifully finished and looks wonderful in our bedroom. We have already recommended Colin's windows to a couple of friends. 5 stars!
    Caroline Bernstein
  • Michael Florey
    I was very dubious about this company mainly because the windows appeared so cheap. You know what they say, buy cheap, buy twice. It appears it’s almost like a husband and wife setup ( I could be wrong) . But they respond immediately and were great. Was so nervous when the Windows upvc sash turned up. But they look fantastic. Had Georgian bars put in with chrome fittings. They Don’t look as genuine as the some of the high end onesBut costing about £700 each. But trust me you'll be pleased, well worth the money, and quick delivery.. Thanks Colin.
    Michael Florey
  • Andrew Birch
    Friendly and very helpful with fast turnaround of my order and will also be ordering more Windows very soon.
    Andrew Birch