Choosing new windows is a big decision for any homeowner. Beyond brochures and product specifications, many people want to see real examples of what’s possible and understand how a professional installation can transform a property.
At Isis Windows, we’ve been supplying and installing high-quality uPVC windows across Oxfordshire since 1997. Over the years, we’ve worked on thousands of homes, from Victorian terraces in Oxford to family houses in surrounding villages. In this article, we share a selection of before and after case studies to show the difference new windows can make in terms of appearance, comfort, and energy efficiency.
Why before and after case studies matter
Window replacement isn’t just about swapping old frames for new ones. A successful installation should improve how a home looks, feels, and performs. Before and after case studies help homeowners to:
- Visualise how new windows will suit their property
- Understand how different window styles work with different house types
- See real improvements in insulation and draught reduction
- Gain confidence in the quality of workmanship and installation
As a local Oxford-based company with in-house fitters, we believe transparency and real-world examples are key to building trust.
Case study 1: Victorian terrace in East Oxford
Before
This traditional Victorian terrace had original timber sash windows that were showing their age. The frames were worn, several windows were difficult to open, and the property suffered from noticeable draughts and condensation. While the homeowner loved the character of the house, the windows were no longer practical or energy efficient.
After
We installed high-quality uPVC sliding sash windows designed to replicate the original style. The new windows maintained the classic proportions and sightlines, while providing modern double glazing and secure locking systems.
Results
- Improved thermal efficiency and reduced heat loss
- Draught-free rooms and less condensation
- Retained period appearance in line with neighbouring properties
- Easier operation and improved home security
The homeowner now enjoys the charm of sash windows with the comfort of a modern installation.
Case study 2: 1970s semi-detached home in Headington
Before
The property had ageing aluminium-framed windows with single glazing. These allowed heat to escape easily and contributed to high energy bills. The frames also looked dated and didn’t complement recent improvements to the exterior of the house.
After
We replaced all windows with white uPVC casement windows featuring energy-efficient double glazing. The design was kept simple and clean to suit the era of the property while significantly upgrading performance.
Results
- Noticeable reduction in outside noise
- Warmer rooms, particularly during winter months
- Lower heating costs due to improved insulation
- Brighter internal spaces thanks to clearer glazing
This installation demonstrates how modern uPVC windows can refresh the look of a home while delivering practical benefits.
Case study 3: Family home in Abingdon-on-Thames
Before
This busy family home had older double-glazed windows nearing the end of their lifespan. Seals were failing, causing misting between panes, and several handles and hinges had become stiff or unreliable.
After
We installed new A-rated uPVC windows throughout the property, including larger openings to maximise natural light in the living areas. All work was carried out by our in-house fitters to ensure consistent quality.
Results
- Clear, mist-free glazing throughout
- Improved ventilation and ease of use
- Enhanced safety with modern locking systems
- A fresh, updated exterior appearance
The homeowners particularly appreciated the tidy installation process and minimal disruption.
Case study 4: Stone cottage in an Oxfordshire village
Before
This character cottage had a mix of old timber and early uPVC windows that didn’t match. Some frames were rotting, while others looked out of place against the stonework. The property also struggled to stay warm.
After
We helped the homeowner select woodgrain-effect uPVC windows in a colour that complemented the stone exterior. The new windows provided a consistent look while offering modern performance.
Results
- Cohesive appearance across the entire property
- Improved insulation without compromising character
- Low-maintenance frames suitable for rural living
- Increased overall kerb appeal
This project highlights how sympathetic window choices can enhance period and countryside properties.
Case study 5: Modern townhouse near Oxford city centre
Before
The townhouse had builder-installed windows that were functional but basic. The homeowner wanted to improve both energy efficiency and aesthetics as part of a wider home upgrade.
After
We replaced the existing units with slimline uPVC windows featuring enhanced glazing for thermal performance. The updated design gave the property a more premium finish.
Results
- Improved EPC rating potential
- Quieter interior despite city-centre location
- Sleek, modern appearance inside and out
- Long-term durability with minimal maintenance
Why homeowners across Oxfordshire choose Isis Windows
Across all these projects, a few key themes remain consistent. Homeowners value our:
- Long-standing local presence since 1997
- Experienced in-house fitters, not subcontractors
- Honest advice tailored to each property
- High-quality uPVC products designed for UK homes
- Clean, professional installation process
We understand the variety of property styles found across Oxfordshire and take pride in recommending solutions that genuinely suit each home.
Thinking about replacing your windows?
If you’re considering new windows and would like to see how they could transform your home, our before and after case studies are a great starting point. Whether you live in Oxford itself or a surrounding town or village, Isis Windows can help you choose the right style and specification.
Get in touch with our friendly team to arrange a free, no-obligation quotation and expert advice tailored to your property.