Alitherm 400 Windows
Smarts Alitherm 400 aluminium windows. PAS24 approved, WER A+ rated and fully compliant with Part L of the Building Regulations.
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Vertical Sliding Sash Windows
If your customers want the look of a traditional timber sash window without the maintenance, uPVC vertical sliding sash windows are the answer. Midland Aluminium supplies from two trusted manufacturers — Victorian Sliders and Mercury — giving you a choice of systems to suit any project. Bespoke sizing, a wide range of colour options and free UK delivery as standard.
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Smooth Operation
Spring and spiral balance mechanisms ensure both sashes open and close effortlessly, providing a smooth and reliable operation throughout the lifetime of the window.
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Suitable for Heritage and Contemporary Projects
Whether you are working on a sensitive period refurbishment or a modern new build, the range covers both — making it a versatile addition to your product offer.
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Low Maintenance
All the charm of a timber sash window with none of the upkeep. uPVC requires no painting, staining or treating — saving your customers time and money.
- Security
- Colours
Security You Can Rely On
Security is built into every uPVC vertical sliding sash window we supply. Fitted with security locks and travel restrictors as standard, and glazed with toughened glass throughout, these windows give your customers genuine peace of mind. Whether you are working on a period refurbishment or a modern property, you can specify with confidence knowing security performance is already taken care of.
Colour Options
Our uPVC vertical sliding sash windows are available in a wide range of colours and finishes, including any classic RAL colour. Dual-colour configurations allow the inside and outside of the window to be finished differently, giving your customers genuine design flexibility. From traditional heritage shades to contemporary finishes, the range covers every project type.
Jet Black
Cream
Chartwell Green
White
Irish Oak
Agate Grey
Duck Egg Blue
Golden Oak
Rosewood
Jet Black
Cream
Chartwell Green
White
Irish Oak
Agate Grey
Duck Egg Blue
Golden Oak
Rosewood
We Only Supply From the Best
We supply uPVC vertical sliding sash windows from Victorian Sliders and Mercury — two of the most established and respected manufacturers in the UK market.
Victorian Sliders bring bespoke craftsmanship and an unrivalled colour range to the table, while Mercury's fully welded Spectus-based systems deliver authentic heritage detailing and modern functionality. Between them, they cover virtually every project type and specification requirement you are likely to encounter.
All the Character of Timber. None of the Hassle.
uPVC vertical sliding sash windows give your customers everything they love about the timber designs — the authentic styling, the heritage charm, the classic proportions — without any of the ongoing maintenance headaches.
Modern uPVC profiles replicate the look of painted timber in remarkable detail, with ovolo detailing, deep bottom rails and horn options that are virtually indistinguishable from the real thing. Add in thermal performance, security and a product that will not warp, rot or fade, and uPVC becomes an obvious choice. Contact us today for a free trade quote within 24 hours.
Your Questions Answered
Not sure which product is right for your project, or want to know more about how we work? Here are the answers to the questions we get asked most often.
Yes. uPVC vertical sliding sash windows are an excellent choice for period and heritage properties. With authentic ovolo detailing, deep bottom rail options, horn detailing and a wide range of heritage colours including RAL and Farrow and Ball matching, they can replicate the appearance of original timber sash windows sympathetically.
Our uPVC vertical sliding sash windows are available in a comprehensive range of colours and finishes, including any classic RAL colour, Farrow and Ball colour matching, woodgrain foils and dual-colour configurations. Dual-colour options allow the inside and outside of the window to be finished in different colours if required.
Yes. Our uPVC vertical sliding sash windows are available in A+ and B-rated options, delivering strong thermal performance and helping your customers reduce energy bills and meet current building regulations.
Yes. Our uPVC vertical sliding sash windows come fitted with security locks and travel restrictors as standard, and toughened glass is included across the range. Together, these features provide a strong level of security performance straight out of the box.
Both spring and spiral balances are mechanisms that allow the sashes to slide up and down smoothly and hold their position when open. Both provide reliable and consistent operation, and our range includes windows with either balance type depending on the system chosen.
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