Cirencester, Gloucestershire
Traditional sliding sash windows on a Georgian townhouse
Traditional sliding sash windows across the front of a Georgian townhouse, period sightlines with modern thermal and acoustic performance.
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Sliding Sash Windows
Sash Windows for Period Homes
Authentic Georgian, Victorian and Edwardian proportions, made to measure for each opening. The elegance of a traditional box sash, without the draughts, rattles or repainting.
- Made to Measure
- A+ Energy Rated
- PAS 24 Security
- Directly Employed Installers
- 20 Year Guarantee
Made for the House
On a period house, the windows are the elevation.
A sash a few millimetres too heavy, missing its horns or welded at the corners gives itself away from the street. Ours are made to measure for each opening, with slim sightlines, glazing bars in the right pattern for the age of the house, run-through horns where the originals had them, straight timber-look joints and a deep bottom rail.
What you can't see is thoroughly modern: A+ rated toughened glazing, PAS 24 security, hidden trickle vents and sashes that tilt in for cleaning. They are surveyed and fitted by our own installers, and covered by our insurance-backed 20 Year Guarantee.
Craftsmanship
The details that make a sash look original.
Timber-look joints
Straight joints where a joiner would cut them, not welded mitres.
Astragal bars
Bars that stand proud of the glass and cast a real shadow line.
Tilt-in cleaning
Both sashes tilt into the room, so every pane is cleaned from inside.
Your Options
Choose your colours, hardware and glass.
WhiteClassic colours
Woodgrain finishes
Matt finishes
Pick a colour to see it on the window. Any colour can also be sprayed to a RAL or Farrow & Ball shade, with white inside if you prefer.
Living With Them
Period character, modern comfort.
A+ energy rated
A window U-value of 1.3 W/m²K as standard, with a 1.2 W/m²K upgrade.
Secure as standard
Tested to PAS 24:2022, with key-locking cam locks, an anti-jemmy cill bar and toughened glass.
Tilt-in cleaning
Both sashes tilt into the room, so every pane can be cleaned from indoors.
Quieter rooms
Sealed units and brush seals end the rattle of old sashes. Acoustic glass is available.
Ventilation you control
Open either sash, with hidden trickle vents and key-operated 100mm restrictors.
No more painting
No rot, no swelling, no repainting. A wipe with a damp cloth keeps them looking new.
Specification
- Energy rating
- A+
- Window U-value
- 1.3 W/m²K standard, 1.2 W/m²K upgrade
- Glass
- Toughened double glazing as standard
- Security
- PAS 24:2022 tested; Document Q on request
- Locking
- Key-locking cam locks and an anti-jemmy cill bar
- Restrictors
- Key-operated, limiting opening to 100mm
- Ventilation
- Concealed trickle vents in the sash rebate
- Cleaning
- Both sashes tilt inwards
- Bottom rail
- 90mm deep option (60mm standard)
- Made
- To measure, in a specialist sash factory
Sliding Sash Windows
Explore sliding sash windows.
Heritage Details
Timber-look joints, a deep bottom rail and run-through horns.
Read moreGeorgian & Astragal Bars
Which glazing pattern belongs on which house.
Read more
Sash Bay Windows
Splayed and box bays in three and five parts.
Read more
Arched Sash Windows
Swept, true and gothic heads, made to the curve.
Read more
Colours & Hardware
Thirteen finishes, any colour sprayed to order, and eight hardware finishes.
Read more
Conservation Areas
What planners look for, and how we help you prepare.
Read moreRecent Projects
Recent Thames Frames window projects.
A selection of our own recent window installations across Wiltshire, Oxfordshire, Gloucestershire and Berkshire.
Cricklade, Wiltshire
Every window replaced, plus a new composite door
A whole-house renovation: every window replaced with white uPVC casements and a new Shadow Grey (RAL 7005) composite front door fitted beneath the porch.
View project
Sandford-on-Thames, Oxfordshire
French doors replaced with a tilt and turn window
First-floor French doors behind a Juliet balcony replaced with a white tilt and turn window, for easy, secure ventilation without leaving doors ajar.
View projectCustomer Reviews
What homeowners say.
"Really happy with our new aluminium sliding doors and three windows for our extension. They look fantastic and have really finished the extension off. The quality is excellent and the fitting was done really well. Everything was straightforward from start to finish and we’re really pleased with the result. Would definitely recommend Thames Frames"
Tracey Owen
Google review
"Thames Frames provided a professional and reliable service from start to finish. The installation was completed to a high standard, the team was punctual and tidy, and the new windows and doors look excellent. I would happily recommend them."
Krishan Mohindra
Google review
"Fantastic service from Thames Frames. Our new flush windows look stunning and have completely transformed the house. Lee and Trevor were brilliant throughout the installation—friendly, professional and took real pride in their work. Everything was left clean and tidy. Highly recommend!"
Keir Gower
Google review
FAQs
Sliding sash windows: your questions answered.
No. They are made from engineered PVC-U, designed to recreate a traditional timber box sash: slim sightlines, run-through horns, timber-look joints, a deep bottom rail and woodgrain or painted-look finishes. You get the look of a joiner-made sash without the repainting, rot or sticking. If your house is listed and timber is required, we'll tell you so honestly at survey.
Free Home Survey
Book Your Free Sash Window Survey
We'll look at your existing windows, measure every opening individually, bring real colour, glass and hardware samples, and give you a fixed written quotation with no pressure.
- Free, no-obligation home survey
- Every opening measured individually
- Fixed written quotation
- Directly employed installers
Free Home Survey
Book Your Free Sash Window Survey
Share a few details and a member of our team will be in touch within one working day. No pressure, no pushy sales.