Flush
Bespoke uPVC flush sash windows built with Eurocell Logik and Modus profiles, double or triple glazing and premium glass from Martin Dales and Glasscraft.
Casement Windows: Built in Leeds, supplied across the UK
Browse our colours, glass options and frame details below. For full technical information, U-values and configurations, download the brochure and share it directly with your team or end client.
- Details & Features
- Specifications
- Glazing & Security
- Colours
- Downloads
Technical specifications
Key specs for our uPVC casement windows:
| Specification | Detail |
|---|---|
| Profile system | Eurocell Logik or Modus |
| Profile options | Chamfered or Ovolo |
| U-value (double glazed) | From 1.2 W/m²K |
| U-value (triple glazed) | From 0.8 W/m²K |
| Energy rating | Up to A++ |
| Glazing thickness | 28mm, 36mm or 44mm |
| Gas fill | Argon with warm-edge spacers |
| Locking | Multi-point shoot-bolt, PAS24 |
| Gaskets | Integrated PCE weather seals |
| Warranty | 10 years |
Glazing and security as standard
Sealed units come from Martin Dales and Glasscraft, with toughened, laminated, Low-E and decorative options available. Every casement window ships with multi-point shoot-bolt locking, internal beading and PAS24 Secured by Design hardware to keep intruders out.
Contact Us
Colour and finish options
Pick from over 30 foils, including:
- White, Cream, Black, Anthracite Grey
- Agate Grey, Slate Grey, Chartwell Green
- Woodgrain effects: Golden Oak, Rosewood, Irish Oak
Dual colours and grey substrates are available on request.
Contact Us
Download the brochure
Need the full specs to price up a job or share with a client? Download our casement window brochure for complete technical detail, U-values, hardware options and much more.
Contact UsThe UK's most-fitted window, built around you
Our process is simple. Send us your sizes, receive a same-day response and a quote within 24 hours, with delivery typically inside two weeks across Leeds, Yorkshire and beyond.
The casement window remains the UK’s most-installed window type for good reason. We build ours bespoke to your project, with precise measurements and in the specification you require. If you have any queries around our process, feel free to get in touch.
Why trade installers choose Alpine
Peter and Richard bring nearly 80 years of combined industry experience to every order. We’re family-run, based in Morley, and we treat trade customers the way we’d want to be treated, with direct lines to the people running the business.
Whether you need one replacement window or a full development, we accommodate every order size. Free delivery across Leeds, flexible lead times and a manufacturing team that understands what installers need on site. Our founders started their careers as installers, so have a real plan to make life as easy for you as possible.
Casement windows: trade FAQs
Quick answers for installers and builders sourcing casement windows from us. For anything not covered, give the trade office a call on 0113 531 3148.
Contact UsMost casement window orders leave our Morley factory within two weeks of order confirmation. Quotes are turned around inside 24 hours, with same-day responses to trade enquiries.
Our core casement range is uPVC using Eurocell profiles. Aluminium options are available on request through our wider product range, alongside aluminium bifold doors for matching projects.
Double glazed casement windows can achieve U-values from 1.2 W/m²K, while triple glazing drops as low as 0.8 W/m²K, comfortably exceeding Part L building regulations.
Yes. Every casement window ships with multi-point shoot-bolt locking, internal beading and PAS24 hardware tested to Secured by Design standards, keeping intruders out and homeowners reassured.
We're based in Morley and offer free delivery across Leeds, but we regularly supply trade customers throughout Yorkshire, Selby and the wider UK. Get in touch with your postcode for details.
How we work with the trade
Our Process
Initial quote
Send us your sizes online or over the phone. We turn most trade quotes around within 24 hours, and there is no obligation to proceed.
Conversation
We talk through the priorities for you or your client, be it design, thermal performance, security, colour finish, glazing, or locking.
Manufacturing
We manufacture in-house at our Morley facility using Eurocell uPVC profiles, DoorCo composite slabs and Alunet aluminium systems. Typical lead time is two weeks.
Bespoke build, testing and supply
Every frame is made to your exact sizes and quality-checked before despatch. Supply only as standard, full installation available on request.
What fellow trade professionals say about us
Honest feedback from the installers, builders and double glazing companies we supply day in, day out.
Had both front and back stable doors fitted recently, and I have to say the men that came to fit them were really good, pleasant, efficient and did a great job! I am really pleased with my doors and the way the men conducted themselves; they are a credit to Alpine – thanks again.
Carol Marshall
I can’t thank the team at Alpine enough for all of the hard work on your build. They were great from the start, being really helpful through the quote process and in advising. The fitting team worked so hard to make sure everything was perfect, and nothing was too much trouble. We are so happy with Alpine. The results really speak for themselves, and we would not hesitate to recommend them to anyone!
Kate Oakes
We recently renovated a small cottage and needed to consider the traditional look and feel of the property, Alpine Windows and Doors were brilliant, listening to our requirements, we ended up with 6 sash windows and a new composite door all in a non standard colour, which was no problem. from placing the order to the completion of the installation nice and smooth, 5 weeks time frame, fitted perfectly with our project, would highly recommend
Tom Crowe
Excellent service from start to finish. They made the process from colours to design easy, nothing was too much trouble. Lovely polite staff and fitters. Fitters turned up on time and finished to an exceptional standard (I am a perfectionist!) left my home clean and tidy and removed all old frames and doors. Couldn’t fault them at any stage and would highly recommend them. I would give more than 5* if I could.
Sarah Wood
Peter at Alpine has done the windows and doors at both our offices and my home. The service was very professional, fast and competitive price wise. I had a combination of Aluminium bi folds and French doors with UPVC windows. I cannot fault the quality. Very happy to recommend for both domestic and commercial projects.
SMILE Air Conditioning
SMILE Air Conditioning
Related Products
Learn More
Bay and Bow
High-performance uPVC bay and bow window systems for trade installers across Leeds and beyond, offering fast supply, strong thermal performance and consistent fabrication quality.
Tilt and Turn
Dual-action tilt and turn windows offering secure ventilation and easy cleaning. Built on Eurocell Logik or Modus profiles for strong thermal performance.
Bespoke
Made-to-measure uPVC and aluminium replacement windows manufactured in Leeds, with custom sizes, glazing specifications, hardware and colour finishes to suit any trade project.
Integral Blinds
Dust-free integral blinds in venetian or pleated styles, available with hand cord or electric operation across our glazed units.
UPVC
The UK's most popular window material, available in proven styles with bespoke sizing, glazing and colour finishes for the trade.
Aluminium
Trade aluminium windows with slim profiles, strong thermal performance and fast UK supply from Alpine Windows & Doors in Leeds.