Sash Windows

Our sash windows are a great way to give your home a traditional defining character alongside all the modern benefits such as natural light, security and thermal performance. Start an online quote with us today.

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What is a sash window?

Sash windows feature two vertical sashes, combining the timeless character of traditional timber windows with the benefits of modern performance. Available in uPVC and timber, they offer authentic period styling, excellent thermal efficiency and low maintenance, making them ideal for homes across South London, Surrey and Kent.

Authentic Period Character

Sash windows are the natural choice for Victorian, Georgian, and Edwardian homes, giving you that classic period look alongside modern performance.

Suited for Conservation Areas

Our sash windows are designed to replicate traditional windows, making them suitable for many conservation areas and period homes.

Easy to Clean

The tilt-in sash design puts safety and effortless cleaning within easy reach, so you can enjoy spotless windows without ever leaning out.

Energy Efficient

The sash windows are A rated as standard, helping retain natural heat and saving on energy bills.

Sash Window Options

Every range comes in its own choice of colours and finishes, from smooth whites and realistic woodgrain foils to powder-coated and heritage shades. Download the brochure below to see the full palette, or ask us to bring samples to your free survey.

Rose Collection Brochure

Choose from a range of durable, stylish hardware, including window handles, stays and locking options, and door levers, which are available in finishes from chrome and satin to white, black, gold and antique-style metals.

Globe Lock

Ultimate Pole Eye

Ultimate Sash Lift

Ultimate Tilt Knob

Acorn Lock

Acorn Pole Eye

Acorn Sash Lift

Acorn Tilt Knob

Emperor Horn

Run-Through Horn

Seahorse Horn

No Horn

Whether you are looking for improved warmth, noise reduction or enhanced privacy, our glazing options are designed to meet your needs, from decorative patterns to obscured glass for bathrooms and entrances.

Cassini

Chantilly

Charcoal Sticks

Contora

Digital

Everglade

Florielle

Mayflower

Oak

Pelerine

Reeded

Taffeta

Tribal

Warwick

Our Gallery

Browse our gallery to see some of our recent projects and get inspiration for your own home. From classic finishes to modern styles, our gallery shows exactly how our sash windows can look once fitted in South London homes.

Designed for Modern Living

View our Gallery

Ultimate Rose sliding sash windows installed by Osborn Glass

Sash Window Features & Benefits

Every detail of our sash windows is modelled on a traditional timber sash, from the horns to the bottom rail. You keep the character of a period window with the low maintenance and performance of a modern one.

Close-up of a white run-through sash horn below the meeting rail

Run-Through Sash Horns

Sash horns are the shaped extensions that run down past the meeting rail on the top sash. Victorian joiners added them to strengthen the sash, and today they are a defining period detail. Ours run seamlessly through the sash rather than being clipped on, and a no-horn option suits Georgian-style homes.

Interior view of a sliding sash window showing the slim meeting rail and sash fasteners

Slim 35mm Meeting Rail

The meeting rail is where the top and bottom sashes overlap in the middle of the window. Ours is just 35mm deep, the slimmest available, matching the fine timbers of an original sash. A slimmer rail means more glass, more daylight and the slim sightlines planners look for in conservation areas.

Deep Bottom Rail

Rainwater runs down to the bottom of a sash window, so timber joiners made the bottom rail deeper to resist rot. We include this deeper rail as standard. It won’t rot, but it gives your windows the correct, well-balanced proportions of a genuine period sash when seen from the street.

Corner of a sash where the rail meets the stile, with a chrome fitch fastener

True Mechanical Joints

Most uPVC windows have welded corners that leave a tell-tale mitre line. Our Ultimate sash uses joinery-style mechanical butt joints instead, vertical on the sashes and horizontal on the frame, just like a timber original. Planners look closely at corner joints, and this detail makes the window hard to tell from timber.

Astragal Glazing Bars

Astragal bars divide the glass into smaller panes, recreating the classic look of Georgian and Victorian sash windows. Our aluminium-mounted bars come in authentic, heritage and Geo profiles, so you can match the pane pattern and moulding of your original windows and keep the character of your home’s frontage.

Inside view of the bottom sash with internal beading, sash lifts and window board

Staff Bead & Tilt-In Sashes

On old timber sashes, the staff bead was an internal moulding that stopped the bottom sash swinging inwards. Modern sashes run on concealed spring balances and tilt inwards for easy cleaning, so it is no longer needed. A removable staff bead is available to recreate the original detail and still let the sashes tilt.

Trusted Windows, Doors, Glass & Mirrors for South London Homes

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FAQs

What is a sash window and how does it work?

A sash window has two glazed sashes set within a single frame that slide vertically past each other on a concealed spring balance system. You can open the top, the bottom, or both at once for excellent ventilation control.

Many of our sash windows also include a tilt function, allowing each sash to swing inward so you can safely clean the outer glass.

Are sash windows suitable for conservation areas?

They are often the preferred choice. Planners look for slim meeting rails, authentic corner joints, period-accurate sightlines, and appropriate colour finishes.

Our sash windows meet these requirements, with a 35mm meeting rail (the slimmest available), true mechanical joints, seamless run-through sash horns, and heritage colour finishes, with astragal glazing bars available for a fully period-accurate result. If your property is listed or in a conservation area, let us know, and we’ll confirm what’s suitable before we agree to any work.

Are uPVC sash windows as good as timber?

Modern uPVC sash windows have come a long way, offering slim sightlines and authentic detailing alongside better thermal efficiency and far less upkeep than timber. This makes them a popular choice for period properties across South London, where owners want the traditional look without the maintenance.

That said, timber still has its place on listed buildings or in conservation areas, where planning rules may require the original material. If you’re unsure which option suits your property, we’re happy to talk through the options and help you find the right fit.

What guarantee comes with a sash window installation?

How do I get a quote for sash windows?

Getting started is simple. Get in touch or fill in our online form, and we’ll take it from there.

We’ll arrange a free, no obligation survey at a time that suits you, take accurate measurements, and come back to you with a clear written quote. There’s no pressure to commit on the day and no charge for the visit.

Client Testimonials

      EXCELLENT  
   Based on 68 reviews 
    
 
 
 
   
 
 
       Posted on Google  
   
   Joshua Raymond 
 
 
 
 Trustindex verifies that the original source of the review is Google. Great experience with Osborn Glass, who I have used for many years.  The windows look fantastic, and the installers were quick, courteous and incredibly neat and tidy.
  
 
      Posted on Google  
   
   Steph Still 
 
 
 
 Trustindex verifies that the original source of the review is Google. I can't recommend this company enough. They are absolutely brilliant. We had a crack in our mirrored splashback and was original told by another company that it would be a really complicated and expensive job. Found Osborn glass and they quoted 4 times less and got the job done in less than an hour! Really great communciation and would highly recommend.
  
 
      Posted on Google  
   
   Riverside Group 
 
 
 
 Trustindex verifies that the original source of the review is Google. Osborn fitted our new front door a couple of years ago and we've been really pleased with it. But what's been even more impressive is their after sales service. Nick, the installation manager, has been brilliant with following up a minor teething problem we had and with other matters. We've recommended Osborn to friends and they've also had a similar experience to us. This is a company that in our experience does not just take the money and then leave you - they follow up and provide great customer service.
  
 
      Posted on Google  
   
   Dee Ellis 
 
 
 
 Trustindex verifies that the original source of the review is Google. Glass was cut to size on the spot. I was also given samples to view with prices of different glass available.
  
 
      Posted on Google  
   
   Kathryn Hughes 
 
 
 
 Trustindex verifies that the original source of the review is Google. So glad I chose Osborn Glass.  From the first communication they were knowledgeable, helpful, good humoured and offered good value.  Will definitely use them again.  Highly recommended.
  
 
      Posted on Google  
   
   Rhona Livesey 
 
 
 
 Trustindex verifies that the original source of the review is Google. I was recommended to Osborne Glass by a friend and I was delighted with them .  Importantly I am thrilled with the quality of their work which has transformed my kitchen.  What set them apart though was the fantastic service from Tony and his team .  As well as doing a superb job they were all just so great to deal with . They would be my first choice on similar projects in the future .
  
 
      Posted on Google  
   
   Sara Negro 
 
 
 
 Trustindex verifies that the original source of the review is Google. I can't recommend this company enough! I had a complex mirror repair on a wardrobe door that was chipped, and I was really worried about it. The mirror had a triangle shape with diagonal edges, and I needed it to perfectly match the other mirrors on the door. I had reached out to other companies, but most told me the job was either impossible or would cost more than the wardrobe itself.

Tony, the manager, was incredibly helpful on the phone, reassuring me that they could do the job and match the existing mirrors perfectly. He was very responsive to emails, and I really appreciated his attention to detail. The service was top-notch from start to finish. The guys who collected and delivered the door were not only professional but also super nice and kind. They even helped me mount the door back onto the wardrobe, which was a lovely touch.

The repair was flawless, and the new mirror matches the original ones perfectly. The whole experience was seamless, and I’m beyond happy with the result. The price was very reasonable for the high-quality work provided. If you need mirror repairs, these are the guys to go to! Professional, reliable, and truly skilled. Thank you, Tony and team!
  
 
      Posted on Google  
   
   Marian Heap 
 
 
 
 Trustindex verifies that the original source of the review is Google. Just wanted to shout out to Steve and Nick at Osborn Glass who sorted out our backdoor issues this week - six years after installation - professionally and efficiently. Fantastic service, thank you!
  
 
      Posted on Google  
   
   Kenzo 
 
 
 
 Trustindex verifies that the original source of the review is Google. Unreliable -they failed to show up as arranged and have not been responsive to emails. Communication is poor.

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Areas We Cover

Based in South Norwood, we cover South London, Surrey, Kent, and Sussex. We also take on larger projects nationwide. Get in touch to confirm we cover your area.

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