Marlborough, Wiltshire
White casement windows on a Georgian family home
A full replacement of tired timber casements on a Georgian family home, matched sightlines, A-rated glazing and a beautifully preserved elevation.
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Sliding Sash Windows
Sliding Sash Windows
The vertical sliding window that gives Georgian and Victorian houses their character, rebuilt with modern thermal and acoustic performance, smooth spring-balanced operation and almost no maintenance.
- Personally Surveyed
- A-Rated Glazing
- Directly Employed Installers
- Insurance-Backed Guarantee
- Free Home Survey
Overview
Period proportions, quietly brought up to date.
A sliding sash window opens vertically: two sashes pass one another within a single box frame. It is the detail that defines the front elevation of most Georgian, Victorian and Edwardian homes, and the reason a sash window replaced badly is so immediately obvious.
Across the Cotswolds and the Thames Valley we work on a great many houses where the windows are the elevation. On a Georgian townhouse the glazing is divided into equal panes with slender astragal bars; on a Victorian villa the sashes are usually larger, often with run-through horns at the meeting rail. Getting those proportions right matters more than anything else on the specification, so we set them out at survey stage and agree them with you before anything is ordered.
The frames we specify are made to measure by established British manufacturers, so the sightlines, sash widths, cill projection and glazing bar pattern all follow the openings you already have rather than a nominal catalogue size. Deep reveals, splayed cills, arched heads and openings that are no longer square are all measured individually and allowed for in the manufacture.
What has changed is everything you cannot see. Modern sash windows use A-rated glazing as standard, warm-edge spacer bars and a properly engineered weather seal, which means a room that used to be draughty and prone to condensation becomes comfortable and quiet. On busier roads through Hungerford, Woodstock or Oxford the acoustic improvement is often the first thing homeowners mention.
Every project starts with a free home survey. We look at the existing windows, the condition of the reveals and lintels, and how each room is used, then set out a fixed written quotation. Installation is carried out by our directly employed installers, registered under our Assure registration, and covered by an insurance-backed guarantee alongside our 20 Year Guarantee.
Key Benefits
Why homeowners choose sliding sash.
A well-specified sash window keeps the character of a period house intact while removing the draughts, rattles and maintenance that came with the originals.
Authentic Proportions
Slender sightlines, correct sash widths, deep bottom rails and traditional glazing bar patterns, all set out and agreed at survey rather than assumed.
Spring-Balanced Operation
Concealed spring balances hold each sash exactly where you leave it and glide smoothly, with none of the cords, weights or sticking of an original box sash.
Tilt-In Cleaning
Both sashes tilt inwards so the outside of the glass can be cleaned safely from within the room, which matters on first-floor and second-floor windows.
Modern Thermal Performance
A-rated glazing as standard, warm-edge spacers and engineered weather seals replace single glazing and draughty gaps, with a noticeable difference in comfort.
Quieter Rooms
Sealed units and precision-fitted frames reduce traffic and weather noise, which is often the most immediate benefit on a road-facing elevation.
Very Low Maintenance
No repainting, no swelling, no rot. A wipe when you clean the glass and an occasional lubrication of the hardware is the extent of the upkeep.
Styles & Configurations
Details that decide how a sash window reads.
Sash windows are defined by their detailing. These are the choices we work through together at survey stage.
Georgian Bars
Equal panes divided by slender astragal bars, the arrangement most Georgian and early Victorian elevations were built with. Six-over-six and eight-over-eight are the usual patterns.
Victorian Two-Over-Two
Larger panes with a single vertical division, typical of later nineteenth-century houses where glass sizes had increased. Simple, generous and full of light.
Run-Through Horns
The projecting extensions either side of the meeting rail found on Victorian and Edwardian sashes. A small detail that does a great deal for authenticity.
Astragal Bars
Applied bars with a bonded spacer, giving the shadow line and slim profile of a traditional divided sash while keeping the sealed unit intact.
Mock Sash
A top-hung opening sash that reads as a vertical slider from outside. Useful where a full sliding mechanism is not needed on a rear or side elevation.
Bay Arrangements
Sashes set into a splayed or square bay, with the corner posts and cill detailing worked out at survey so the proportions stay balanced across the bay.
Fixed Lights & Cottage Sashes
Shorter upper sashes, unequal splits and fixed panes for openings where the original window was never symmetrical. Made to the opening, not to a standard size.
Ventilation & Restrictors
Night-vent positions and sash restrictors specified where they are wanted, particularly on bedrooms and landings with young children.
Ready to talk about sliding sash windows?
Arrange your free home survey, expert advice, accurate measuring and a fixed written quotation with no pressure.
Colours & Finishes
Finishes that settle into a period elevation.
Colour is the fastest way to make a replacement sash look wrong, so we keep the palette restrained and match it to the age and materials of the house.
Traditional White
The default on most Georgian and Victorian elevations, and still the finish that reads most naturally against stone, render and painted brickwork.
Cream & Off-White
A softer, slightly warmer alternative that sits well against Cotswold stone and older lime-based renders where a bright white can look stark.
Heritage Greys & Greens
Muted grey and green shades in the tradition of painted joinery, suited to houses where the windows were never brilliant white.
Timber-Effect Grains
Grained foil finishes that carry the texture of painted or stained timber, useful on conservation-sensitive elevations viewed from close range.
Dual Colour
A heritage shade outside and white inside, keeping the elevation correct without darkening the reveals of a smaller room.
Hardware Finishes
Sash lifts, fitch fasteners and pulls in polished chrome, satin, black or antique brass, chosen to match existing ironmongery elsewhere on the house.
If your home sits within a conservation area, we will talk through what is likely to be acceptable before you commit to anything, and set the agreed specification out in your fixed written quotation. Where the local authority needs to see details of sightlines, glazing bars or finish, we will provide them.
Energy Efficiency & Security
Comfort and security without altering the character.
The visible detailing stays traditional. The glazing, seals and hardware do not.
A-Rated Glazing as Standard
Modern sealed units with warm-edge spacer bars replace single glazing, which changes how a period room holds heat on an exposed elevation.
Draught-Free Seals
Brush and compression seals along the sash and frame remove the rattle and the through-draught that came with original box sashes.
Acoustic Options
Where a house faces a busy road, an acoustic sealed unit specification is available and makes a marked difference to bedrooms at the front.
Multi-Point Locking
Locking sash fasteners and internally beaded units are specified as standard, so a traditional-looking window is not a weak point.
Reduced Condensation
Warmer glass and balanced night-vent ventilation remove the cold surfaces where morning condensation used to gather on period windows.
Conservation Sensitivity
Slim sightlines, correct bar patterns and restrained colours are chosen so the improvement is felt inside and barely noticed from the pavement.
Gallery
Sliding sash windows on period homes.
A selection of window photography showing sash proportions, bar patterns and finishes.
Recent Projects
Window installations across the Cotswolds and Thames Valley.
A selection of recent Thames Frames window projects completed across Wiltshire, Oxfordshire, Gloucestershire and Berkshire.
Burford, Oxfordshire
Flush casement windows on a Cotswold stone cottage
Flush casement windows in a heritage cream, specified to respect the character of a stone cottage in a Cotswold conservation area.
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.
Royal Wootton Bassett, Wiltshire
Slim aluminium windows to a contemporary extension
Slim anthracite aluminium windows to a rear kitchen extension, maximising daylight and framing the garden view.
Wantage, Oxfordshire
Traditional bay window on a family home
A replacement bay window to the principal reception room, restoring proportion, light and the character of the elevation.
Hungerford, Berkshire
Aluminium picture window in a country living room
A large fixed aluminium picture window paired with side-opening casements, a considered, contemporary specification for a country home.
Customer Reviews
What homeowners say.
"Careful, considered work from start to finish. The new windows sit perfectly and the house feels transformed."
Mr & Mrs H
Marlborough, Wiltshire
"You'd never know they weren't original. Sympathetic, immaculately installed and exactly what our cottage needed."
Mrs L
Burford, Oxfordshire
"The new sashes have completely lifted the front of the house. The advice at survey was refreshingly honest."
Mr K
Cirencester, Gloucestershire
"Beautifully engineered and finished. The extension feels bright, calm and considerably warmer."
The Whitmore family
Royal Wootton Bassett, Wiltshire
"Meticulous survey and a very high standard of installation. We couldn't be more pleased with the finished result."
Dr M
Wantage, Oxfordshire
"Balanced, honest advice at survey and a lovely, tidy install. The finished result is stunning."
Dr & Dr H
Hungerford, Berkshire
FAQs
Sliding sash windows, your questions answered.
It depends entirely on the detailing, which is why we agree it before anything is ordered. Slim sightlines, correct sash widths, a deep bottom rail, the right glazing bar pattern and run-through horns where the originals had them are what make a replacement read correctly from the pavement.
Free Home Survey
Ready to talk about sliding sash windows?
Arrange a complimentary home survey with one of our window specialists. We'll measure each opening, agree the proportions and detailing, and leave you with a fixed written quotation and no pressure at any stage.
- Free, no-obligation home survey
- Fixed written quotation
- Insurance-backed guarantee
- Directly employed installers
Free Home Survey
Book Your Free Sash Window Survey
Share a few details and a window specialist will be in touch within one working day. No pressure, no pushy sales.
Get In Touch
Ready to discuss your project?
Arrange a complimentary home survey at a time that suits you. We listen carefully, measure precisely and recommend the products best suited to your property.