Sash Windows & Doors At Trade Prices

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Why Choose Us?

Two Decades of Experience
Competitive Prices
Deliveries from 4 weeks

Free Consultation
Satisfied Customers
10 Years Guarantee

Export enquiries welcome. We export all our products worldwide

Who We Are

One of the UK's biggest sash windows suppliers

At Colin's Sash Windows we offer our products at trade prices direct to the trade and to retail customers.

Our main seller is obviously our uPVC sliding sash windows. Colin's Sash Windows is best known for disrupting the upvc sash window market in the UK in 2014 by introducing affordable fixed prices for upvc sash windows in the UK. Before this they were generally only available at very high prices through window installers. The quality of our sash windows is excellent. Starting at £270 plus VAT for white and £337 plus VAT for standard woodgrain colours, we are often asked if the quality is good because of the low prices. Over 40% of our business is from repeat customers (this doesn't include recommendations). We think that speaks for itself.

Because of demand from our customers we don't just sell sash windows. We supply one of the most sought after products in the double glazed windows industry this decade - we are market leaders in cheaper alternatives to steel windows and french doors. Interior Aluspace doors and partitions that are almost as slim as steel and external steel look aluminium Smart Systems Alitherm Heritage Steel Look Aluminium French Doors and windows. These are now our second biggest seller. We have an unrivalled knowledge of these products and possibly the best prices in the UK.

Our latest product, FD30 steel glazed fire doors are proving extremely popular.

One of our other best sellers are the uPVC flush casement windows. We have very low prices with fast delivery on these. Within our double glazed windows category we also offer a range of casement windows in all three materials which are uPVC, aluminium and timber.

If you use social media check out our Facebook page. It's one of the busiest Facebook pages in the window industry and shows recommendations and photos from customers. The same with Instagram.

In 2026 we have reach a milestone of supplying over 50,000 windows handled by a highly qualified team in the office that offer personal service to all enquiries. We have unrivalled knowledge of the products we sell. Call us today on: 01525 552131 or email sales@colinssashwindows.co.uk.

Our range of windows

uPVC Sash Windows – Double Glazed Sash Windows

Double Glazed Sash Windows If you’re in the market for new sash windows, you’ve come to the right place. Sliding Sash windows are a classic and elegant choice for any home, and they can add a touch of traditional charm to any room. Whether you’re looking for a modern twist on this timeless design or […]

Mechanically jointed uPVC sash windows cover

Mechanically Jointed uPVC Sash Windows from The UK’s No1

Mechanically Jointed uPVC Sash Windows Our mechanically jointed sash window replicates the 90-degree joins on timber sliding sash windows. Our customers have always had a lot of success getting approval for our normal uPVC sliding sash windows in conservation areas but with this window – from the incredible £437+VAT, it`s almost a forgone conclusion. No […]

uPVC Casement Windows – Get a Quote Today!

Double Glazed Casement Windows Could you imagine your home with uPVC windows that are as long-lasting as they are beautiful, as elegant as they are energy efficient? By replacing your existing windows with our British-made uPVC casement windows you could upgrade your place. Each window can be designed to meet all of your demands. Choosing […]

Aluminium Casement Windows

Here at Colin’s Sash Windows we are not only the UK’s biggest supplier of sash windows – we sell a lot of aluminium windows and aluminium doors, including a wide selection of double glazed casement windows for all property types. Why? Well, our prices are really competitive and, more importantly, our after sales service is […]

Flush Casement Windows: A Modern and Sleek Design for Your Home

Flush casement windows are a popular window design that is gaining traction in the UK. These windows are characterised by their sleek, flat appearance, which creates a smooth surface on the outside when closed. This design is achieved by having the frame sit flush inside the window when closed, which creates a minimalist and elegant […]

Timber Sash Windows Best Prices From the UK’s No. 1

Buy Double Glazed Timber Sash Windows from the UK’s No.1 Supplier At Colin Sash Windows, we supply the finest timber sash windows, crafted carefully to retain the elegant proportions of traditional sash windows while incorporating the best modern-day materials. With our wood sash windows, maintenance problems, and drafts are eliminated. You truly get to experience […]

Timber Casement Windows – Best Prices Guaranteed

Why choose us for your wood casement windows? Our timber windows come fully glazed and painted in a RAL colour of your choice with quality “Mighton” hardware. There are two styles available – timber flush casement windows or the traditional stormproof design. The durability of our wooden windows is second to none and you can […]

Our range of doors

Aluspace Aluminium Internal Doors From the UK’s No1 Supplier

Single Glazed AluSpace Aluminium Internal Doors and Screens Our Doors, your Interior! Our aluminium internal doors are a sleek and modern choice for any home. With their durability and low maintenance, these doors are perfect for high-traffic areas. Their slim frames and contemporary designs make them a popular choice for those looking to add a […]

Internal Steel Doors and Partitions

Our Range of Internal Steel Doors £1,160.00 Plain Single Steel Hinged Internal Steel Door 800w x 2100h £1,160.00 3 Panes Trim handle Steel Hinged Single Internal Steel Door 800w x 2100h £1,160.00 4 Panes Mortice latch handle Internal Black Steel Hinged Single Door 800w x 2100h £1,160.00 3 Blocks Pull handle Steel Hinged Single Internal […]

Aluminium heritage doors with top and side panels - inside view - cover

Steel Look Aluminium Heritage French Doors – From the UK’s No1 Supplier

Design & Order Your Aluminium Heritage Doors in 3 Easy Steps We offer made-to-measure steel look French doors fitted with reliable multipoint locking systems and quality hardware. Below, you can view our selection of Single and Double aluminium heritage external doors. You can personalise your door to suit your needs and place your order online […]

Premium Aluminium Bifold Doors | Stylish & Secure Folding Doors

Why Buy Our Aluminium Bi-Folding Doors? Seamlessly connect your indoor and outdoor living spaces. Throwing your entire home open to the garden isn’t just a luxury, it’s a new way to live. Our aluminium bi-folding doors are engineered to make this transformation beautiful, secure, and energy-efficient. Colin’s aluminium bi-folding doors are beautifully designed, versatile doors […]

Aluminium French Doors – From UK’s No.01 Seller

French Aluminium Doors – Made to Measure If you’re looking for durable and energy efficient doors for the exterior of your home, look no further than the Aluminium French doors by Colin’s Sash Windows. Whether you prefer a heritage style, a slim profile steel look, or simple aluminum French doors, we are your one-stop solution. […]

uPVC French Doors

Always in Style uPVC French Doors The flexible uPVC material allows you to customise your dream French doors with side and top lights in a bespoke colour and finish of your choice. You can add a low threshold option and choose from different glazing options. The doors are guaranteed to last almost a lifetime with […]

Flush uPVC French Doors – Stunning Heritage Look

New Stunning Flush French Doors After the impressive success of our Heritage flush windows, we are proud to announce that we added an equally stunning new Flush French Doors to our Heritage Collection. The door-leaf fits flush into the frame making it a perfect match to our range of flush casement windows. The new Flush […]

Timber French Doors

If you like the classical look of wooden french doors and look for a high-quality products you’ve come to the right place. Our company supplies made to measure timber french doors to the UK. Developed in the 17th century the French doors are still a preferred choice for many homes. The versatility to open them […]

uPVC Patio Doors

Best in Class uPVC Sliding Patio Doors If you’re looking for the perfect frame for the perfect view our new best in class Patio Doors are for you. The uPVC sliding patio door is a star in the commodity market. The door design is based upon innovation, performance and style. The easy operating structure allowed […]

Internal Steel Fire Doors – Steel Fire Rated Doors

When it comes to fire safety within a building, internal steel fire doors are a critical component. These doors not only provide robust fire resistance but also enhance the overall safety and compliance of your property. At Colin’s Sash Windows, we specialise in high-quality internal steel fire doors designed to meet UK fire safety regulations […]

Our Customers Reviews

"We used Colin's Sash Windows to replace a single sash window. Local suppliers did not want the job or quoted alarming prices. Colin's supplied a quality window at a good price, helped us with the measurements which we managed to get right and kept us informed of what was happening. The window was delivered in the time scale promised. Highly recommended."

- Roger Corke

"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

"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

"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

"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

"Friendly and very helpful with fast turnaround of my order and will also be ordering more Windows very soon."

- Andrew Birch

"Great service and doors with excellent quality! I am really happy that I choose Colin and his team to assist me. The new french doors are perfect. I will use his service again."

- James Owen

"The aluminium bi-fold doors from Colin's are one of the best purchases that I've made. There is no compromise on the quality and the price is right. Thanks for your amazing assistance, Colin!">

- Stanley Cook

"I had some really bad experiences with other companies selling doors online, but finally I've found the right supplier. Colin's Doors provide top service at affordable price. The support team is great and Colin himself helped me with some measures. Thanks a lot! "

- Louisa Barnes

Colin’s sash windows

5.0

Based on 16 reviews

review us on

Suleman Javed

7 months ago

Great service great Quality and Very cheap Prices

Plumbing Vancouver

7 months ago

We recently chose uPVC casement windows from Colin’s Sash Windows and are extremely pleased with the results. The installation was smooth, professional, and completed on time. The windows look stylish, improve insulation, and operate perfectly. The team was friendly and helpful throughout the process. Highly recommend their service for quality workmanship and reliable results.

Night Owl

7 months ago

Colin’s Sash Windows delivered excellent craftsmanship across uPVC aluminium, and timber options. The finish looks natural and elegant, perfectly matching our home’s character. Smooth operation, strong insulation and professional installation made the entire experience reliable and highly recommended for quality sash windows. Thanks guys!

Local Expert

7 months ago

Fantastic Window Service!

Riya Kashyap

7 months ago

Very good experience, good quality prducts, professional staff, excellent finishing, reasonable prices, highly recommended to all

Muhammad Taha Daud

7 months ago

Recently purchased Colin's Sash Windows & installed in our home, and I'm really impressed!
We went for their uPVC sliding sash windows to replace the old ones. The price was unbeatable for A+ rated double glazing.
we used their recommended fitter, and the finish is excellent.
Highly recommend without the premium price tag.

Joe Worrall

10 months ago

Really friendly company, easy to deal with. I need data for an order I made 4 years ago and they're able to dog out my file and send over the information. Very friendly and helpful and the windows we ordered look great and are good quality, even 4 years later

Jodie Dickinson

11 months ago

We ordered four white uPVC sash windows and they were delivered on time, well packaged, and exactly as described. Easy company to deal with and everything went smoothly from start to finish.

Adam Lewis

11 months ago

Bought French doors and three sash windows from them last year. Still working perfectly and no draughts. Good communication and nice people to deal with.

Kiera Carroll

11 months ago

Had all our old sash windows replaced through Colin’s and the result is fantastic. The fitters were polite and tidy, and the new windows look beautiful. Great value for the money too.

Lewis Hawkins

11 months ago

We’re builders and have used Colin’s several times now. Prices are good and they deliver across the UK. One set came with the wrong handles once, but they sorted it quickly.

Dorothy Lopez

12 months ago

Had all our old sash windows replaced by Colin’s and they look brilliant. The house feels warmer and quieter already. Delivery took a bit longer than planned, but the quality made up for it.

         Posted on Facebook  
   
   Julian Weber 
 
 
 
 recommendsTrustindex verifies that the original source of the review is Facebook. We had ours fitted last week and the difference is huge. No more draughts and they look amazing from outside.
  
 
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   Jeff Anderson 
 
 
 
 recommendsTrustindex verifies that the original source of the review is Facebook. After comparing loads of quotes, Colin’s gave the best price and still top finish.
  
 
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   Hugo Lefevre 
 
 
 
 recommendsTrustindex verifies that the original source of the review is Facebook. Couldn’t be happier with our new sash windows. They look brilliant and make the whole house warmer already.
  
 
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   Scott Tucker 
 
 
 
 recommendsTrustindex verifies that the original source of the review is Facebook. Very good workmanship. The house feels warmer and quieter, and the finish inside is neat and tidy.
  
 
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   Kristian Hansen 
 
 
 
 recommendsTrustindex verifies that the original source of the review is Facebook. Ordered direct for a rental refurb and everything went smoothly. Quick turnaround too.
  
 
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   Stefan Petrescu 
 
 
 
 recommendsTrustindex verifies that the original source of the review is Facebook. Got ours for the rental flat and the tenants love them. Quiet, warm and stylish.
  
 
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   Brino Bernardo 
 
 
 
 recommendsTrustindex verifies that the original source of the review is Facebook. Really fair prices. Other quotes were nearly double for the same spec.
  
 
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   Jack Jones 
 
 
 
 recommendsTrustindex verifies that the original source of the review is Facebook. We had the flush casement windows fitted in our extension. Lovely clean look.
  
 
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   Haines Gorcia 
 
 
 
 recommendsTrustindex verifies that the original source of the review is Facebook. Top-notch service from start to finish. The fitters were polite, tidy and got it all done in a day.
  
 
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   Aleegra Rodriguez 
 
 
 
 recommendsTrustindex verifies that the original source of the review is Facebook. Finally got round to replacing the old sash windows and wish we’d done it sooner. Looks brilliant now.
  
 
  
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