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More than 500,000 installations

sliding windows

Sympathetic style, innovative design

With a quintessentially English silhouette and charming detail, the vertical sliding sash window is a sought-after design. Despite its long heritage, the sash window remains a practical solution for homeowners seeking plentiful natural light and fresh air.

Traditional timber sash windows, although beautiful, can be high-maintenance and, depending on their age, may not provide optimum thermal and acoustic performance.

If you’re renovating a period property – or a new build with a traditional aesthetic – we offer an alternative to timber. The Kommerling vertical sliding sash window combines all the desirable features of a timber sash window, with the benefits and conveniences of modern materials. 

British-designed and manufactured, and suitable for conservation areas, the Kommerling system combines advanced technology, authentic design and timeless style. 

sash windows

Technical innovation

Built to last, the Kömmerling sash window boasts a host of features that meet the demands of modern living. Comfortably satisfying current building regulations, the Kömmerling sash window is rigorously tested for weather performance and strength, with PAS 24 enhanced security performance also available for extra peace of mind.

Bedroom sliding sash Windows

Colours

If you like the look of painted timber windows but want the benefits of uPVC, you’ll love our range of foil laminate finishes, available in smooth and realistic woodgrain options. They complement both the exterior and interior of your home, and you can even choose one colour and finish for the outside and a totally different one for the inside.

Veka sliding sash windows

Traditional detail

The Kömmerling vertical sliding sash window features all the classic detailing found in period timber sash windows, including fusion-welded corners for a clean finish and authentic run-through sash horns. It also has a deep bottom rail for a true Georgian/Victorian look, with quick-release hinge arms so both sashes lift out easily for cleaning.


Heritage and performance

Modern Rustic Farmhouse Style Wood Dining Room

Design excellence

Since our foundation in 1991, we have installed thousands of sliding sash windows. We can confidently say that Kommerling’s vertical sliding sash window is the most impressive we’ve offered. The elegant sculptured outer frame, choice of heritage sashes and authentic sash horns make for a truly impressive finish.

Veka sliding sash window in bright modern bedroom

Performance

We understand that being faithful to the period of your property is paramount, and that compromising on style is something you may be reluctant to do. This is where Kommerling comes in, combining traditional looks with modern performance.

Boasting superior draught proofing and severe weather performance, every Kommerling sash window is A-rated as standard, with a U-value of 1.2 W/m2K.

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areas we serve

stockport | manchester | cheshire | wilmslow | alderley edge | high peak | oldham | salford | tameside | trafford | rochdale | bury | bolton


finance

Finance  | Finance FAQs | Vulnerable Customer Policy |  Finance Complaints Procedure
Alexander Windows Limited is registered with Companies House at Unit 42a Newby Road Industrial Estate, Newby Road, Hazel Grove, Stockport SK7 5DA. In England & Wales. Company number 02599172. Alexander Windows Limited is authorised and regulated by the Financial Conduct Authority FRN 1037109. We act as a credit broker not a lender and offer finance from a panel of lenders.