Reading · 29 August 2026
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Replacement Windows
Premium Replacement Windows
Thames Frames supplies and installs high-performance replacement windows tailored to every style of home, combining energy efficiency, security and beautiful design across Wiltshire, Oxfordshire, Gloucestershire and Berkshire.
- Personally Surveyed
- A-Rated Glazing
- Professionally Installed
- Insurance-Backed Guarantee
- Free Home Survey
Window Colour Studio
See every colour on a real house.
Choose a window style, then tap any of our 30 colours and woodgrains to see the windows change on a real house. Add the design to your survey request and we'll bring the matching samples.
Style exampleCasement · Anthracite Grey
Window style
Our most popular window. Sashes sit just proud of the frame, with plain glazing and top-opening vents.
Smooth colours · 11
Textured & metallic · 4
Woodgrain foils · 15
Inside colour
Anthracite Grey outside with a white interior, a popular way to keep rooms light.
Handles
Your design
Casement windows in Anthracite Grey, white inside, chrome crank handles
Recent Installations
Our own recent window installations.
Photographs of recent Thames Frames window installations, shared from our own Facebook and Instagram.
Window Styles
Five considered ranges.
Every home deserves windows chosen to suit its architecture and how it's lived in. We specify five core ranges, each carefully considered for performance, security and long-term appearance.
Casement Windows
Traditional, versatile and our most popular replacement window. Excellent energy efficiency with a wide choice of colours, glazing and hardware.
Explore Casement Windows
Flush Casement Windows
Contemporary flush-fitting appearance that suits both period homes and modern properties while retaining outstanding thermal performance.
Explore Flush Casement Windows
Sliding Sash Windows
Traditional vertical sliding windows offering classic aesthetics with modern security, smooth operation and low maintenance.
Explore Sliding Sash Windows
Aluminium Windows
Slim sightlines, exceptional strength and contemporary styling, ideal for premium homes and larger glazed openings.
Explore Aluminium Windows
Bay Windows
Bay and bow configurations designed to bring added light, a sense of space and balanced proportions to the home.
Explore Bay WindowsHardware
Handles in seven finishes.
Window handles are die-cast for strength and finished with a PVD coating, a hard-wearing surface that resists corrosion and scratches far better than ordinary plating. A marine-grade range is also available for coastal and exposed homes.
Crank handle
Our standard ergonomic window handle.
Monkey tail
A traditional curled handle for period homes.
We can match the handle finish to your door furniture, so windows and doors work together.
- White
- Black
- Chrome
- Gold
- Bronze
- Anthracite
- Graphite
Glazing
A-rated as standard, triple glazing if you want it.
Every window starts with an A-rated double-glazed unit. Upgrade to triple glazing for even warmer rooms, or choose a decorative obscure glass for bathrooms, landings and hallways.
Standard on every window
A-rated double glazing
28mm sealed unit
Upgrade
A+ rated triple glazing
36mm sealed unit
Upgrade
A++ rated triple glazing
40mm sealed unit
Decorative and obscure glass
Fourteen patterns give privacy while still letting the light in. We bring samples to your survey.
- Autumn
- Taffeta
- Sycamore
- Stippolyte
- Minster
- Mayflower
- Laurel
- Florielle
- Flemish
- Digital
- Cotswold
- Contour
- Charcoal
- Chantilly
See It in Action
Windows in action.
Short films of real Thames Frames window installations.
The Benefits
Quietly transformative.
Replacement windows do far more than change the look of a home. Well-specified, expertly installed windows transform comfort, running costs, security and the character of every room.
A-Rated Energy Efficiency
Warmer in winter, cooler in summer and noticeably lower running costs, modern glazing dramatically improves comfort throughout the home.
Quieter Interiors
Acoustic-grade sealed units and precision-fitted frames reduce outside noise from roads, weather and neighbouring properties.
Enhanced Security
Multi-point locking, laminated glass options and internally beaded units are specified as standard for peace of mind.
Beautiful Design
An extensive range of colours, finishes, glazing bars and hardware, chosen to complement the character of your home.
Reduced Condensation
Warm-edge spacer bars and correctly balanced ventilation eliminate the cold spots where condensation used to gather.
Low Maintenance
Premium frames, hardware and finishes designed to look and perform beautifully for decades with minimal upkeep.
Why Choose Thames Frames
Considered craftsmanship, quietly delivered.
Homeowners across Wiltshire, Oxfordshire, Gloucestershire and Berkshire choose Thames Frames because we approach replacement windows the way considered home improvements should be done.
Personally Surveyed
Every project is measured and assessed by an experienced specialist, never a commission-driven salesperson.
Professionally Installed
Our directly employed fitting teams are known for their precision, care and considered site work.
Energy-Efficient Glazing
A-rated as standard, with A+ and specialist acoustic and solar-control options where they add real value.
Premium Materials
We specify only proven window systems from established British manufacturers, no unbranded imports.
Insurance-Backed Guarantee
Comprehensive cover that stands independent of the installer, alongside long-term manufacturer warranties.
Outstanding Aftercare
A settled office team and the same installers you met on day one, the people who fit your windows care for them afterwards.
Guarantees
Protection you can rely on.
Every window installation is supported by layered guarantees, from the manufacturer, from Thames Frames and, importantly, from an independent insurance-backed scheme.
Insurance-Backed Guarantee
Every window installation is protected by a comprehensive insurance-backed guarantee, cover that stands independent of the installer.
Manufacturer Warranties
We specify only proven frames and sealed units from established British manufacturers, each supported by long-term product warranties.
Assure Certified Compliance
As an Assure registered installer, we take care of Building Regulations compliance for you. Every installation is registered correctly, and you'll receive your official certificate after completion, giving you confidence now and when you come to sell your home.
Aftercare You Can Reach
Directly employed installers and a settled office team mean the people who installed your windows are the same people who care for them afterwards.
Recent Projects
Replacement windows across the Cotswolds and Thames Valley.
Thames Frames installs premium replacement windows throughout Wiltshire, Oxfordshire, Gloucestershire and Berkshire. A selection of recent projects from across our service area.
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 project
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.
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.
"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
Frequently Asked Questions
Replacement windows, your questions answered.
Every home is different, so the cost of replacement windows depends on the style, material, glazing specification, number of openings and any structural considerations. Rather than quote a misleading headline figure, Thames Frames provides a fixed written quotation after a free home survey, with no pressure and no obligation.What affects replacement window costs
Free Home Survey
Ready to Transform Your Windows?
Arrange a complimentary home survey with one of our window specialists. We'll listen carefully, measure precisely and recommend the right window style, glazing and finish for your home, 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 Window Survey
Share a few details and a window specialist will be in touch within one working day. No pressure, no pushy sales.