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.
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 Styles
Four considered ranges.
Every home deserves windows chosen to suit its architecture and how it's lived in. We specify four core ranges, each carefully engineered for thermal performance, security and long-term beauty.
Casement Windows
Traditional, versatile and our most popular replacement window. Excellent energy efficiency with a wide choice of colours, glazing and hardware.
Flush Casement Windows
Contemporary flush-fitting appearance that suits both period homes and modern properties while retaining outstanding thermal performance.
Sliding Sash Windows
Traditional vertical sliding windows offering classic aesthetics with modern security, smooth operation and low maintenance.
Aluminium Windows
Slim sightlines, exceptional strength and contemporary styling, ideal for premium homes and larger glazed openings.
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.
CERTASS Certified Compliance
As a CERTASS registered installer, we take care of Building Regulations compliance for you. Every installation is registered correctly, and you'll receive your official certification 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.
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.
"The whole team were a pleasure to deal with. Our new casement windows are beautifully finished and the house feels warmer and quieter already."
Mr & Mrs T
Faringdon, Oxfordshire
"Thames Frames were recommended by a neighbour. The flush casements are exactly right for our cottage, the character is preserved and the performance is excellent."
Mrs D
Malmesbury, Wiltshire
"Meticulous installation and a very high standard of finish. The new sliding sash windows have completely lifted the front of the house."
Mr K
Lechlade, Gloucestershire
"Balanced, honest advice at survey and a lovely, tidy install. The aluminium windows in the extension are stunning."
Dr & Dr H
Hungerford, Berkshire
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.
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.