- April 20, 2026|
- Windows|
- sandymount_admin
Wondering how to choose replacement windows?
It can feel overwhelming at first, and the sheer abundance of styles and materials available can make it tricky to match a product with your own home, and unique requirements at that.
We believe that in order the find the right replacement windows for pretty much any property, there are six key things you need to look out for or consider. These being the frame material, opening style, energy rating, security features, aesthetic and overall affordability. Tick these boxes, and you’re promised a product that will function perfectly at your house for decades.
In this guide, we break these factors down, explain why they’re so important, and recommend products that excel when it comes to energy efficiency, being secure and looking great.
How to choose replacement windows: things to watch out for
Before you choose your new windows, it helps to understand what really matters beyond appearance.
Window materials
The material of your window frames has a big impact on durability, energy efficiency, maintenance and long term performance. Many older homes still have timber windows, and whilst they may look pretty, they begin to struggle from a performance standpoint over time. The wood often ends up rotting after a rainy winter, inviting insects to nibble on the cracks, and the paint regularly peels or flakes.
Choosing the right material gives you better insulation, reduced heat loss, lower maintenance and improved energy performance.
Our solutions: uPVC and aluminium
We offer carefully selected materials designed for modern living and traditional properties alike.
uPVC windows
- uPVC is a strong, multi chamber synthetic material designed to reduce heat transfer through the frame
- It offers excellent insulation, helping reduce energy bills and draughts caused by air leakage
- Low maintenance by nature, no painting or sealing is needed
- Available in white, but also woodgrain finishes such as Golden Oak or Rosewood for period properties. These convincingly replicate the look of timber, even featuring grain patterns.
- Elite for thermal performance, and affordable due to its ability to be mass-produced. It’s also recyclable, so is an environmentally-friendly pick.
Aluminium windows
- Slim, strong metal frames using advanced thermal breaks to reduce heat transfer
- Allows larger glass panes for more natural light and expansive views
- Ideal for modern homes, new construction and architectural designs
- Very durable and resistant to weather damage
- Available in 200+ RAL colours including Anthracite Grey and Black
Window styles
The style of your windows has a huge effect on the look of your home, natural light levels and ventilation. Different types of windows suit different properties, from period cottages to modern builds.
Our window styles
We install a wide variety of window designs to suit every property:
- Casement windows
Side opening or top opening window units hinged on one side. They are simple, secure and one of the most popular choices for window installation due to strong sealing and energy efficiency - Flush sash windows
Designed so the glass sits perfectly level with the frame. They replicate timber windows but with modern uPVC performance, making them ideal for period homes or conservation areas - Sliding sash windows
Vertical opening windows with lower sashes that slide up and down. Romanticised and desired for centuries, they are perfect for heritage homes and offer controlled ventilation and traditional charm
Energy ratings
Energy ratings are essential when selecting replacement windows. They show how well a window reduces heat loss and controls solar heat gain in summer.
A key measure is the U-value, which shows how much heat passes through the window. The lower the U-value, the better the insulation. Modern double glazing typically achieves around 1.4 W/m²K, while high performance triple glazing can reach below 1.0 W/m²K.
Sandymount energy ratings
Our replacement windows are designed to meet and exceed current building regulations and Part L requirements. We offer double and triple glazing options with low emissivity glass, argon gas fills and acoustic upgrades. This helps reduce draughts, improve comfort and support long term energy savings.
Security features
Home security is a major concern when choosing new windows. Modern systems are far more secure than older timber or early PVC windows.
At Sandymount, we fit all windows with:
- Multi point locking systems for strong compression sealing
- Laminated and toughened glass options for added protection
- PAS 24 compliant upgrades for the best possible home security
- Robust espagnolette locking mechanisms
These features give peace of mind while meeting strict building code requirements.
Aesthetics
Your windows should suit the architectural style of your home. The right finish can bring balance to both interior and exterior spaces.
Sandymount aesthetic options
We offer a wide selection of finishes to match your property:
- Woodgrain foils including Oak, Rosewood and Irish Oak
- Contemporary colours such as Anthracite Grey, Chartwell Green and Black
- Dual colour options for different inside and outside finishes
- Decorative glazing for privacy and style
These choices help ensure your new windows suit both traditional and modern properties.
Cost
Cost is often a key factor when deciding on the right replacement windows, but it is important to balance price with performance and lifespan.
Affordable windows in North Wiltshire, Gloucestershire, Oxfordshire and Bristol outskirts
At Sandymount, we offer solutions across a range of budgets:
- uPVC windows are the most affordable option due to efficient manufacturing, not reduced quality
- Casement windows are often the most cost effective style because of their simple design and reliability
- Aluminium windows sit at the premium end, often used in high end homes and new builds due to slim frames and increased natural light
We provide a free quote and free consultation to help you understand the best options for your home and budget.
FAQs
What are the best types of replacement windows for energy efficiency?
Double or triple glazed uPVC and aluminium windows with low E glass and argon gas offer the best energy performance, reducing heat loss, draughts and helping improve overall comfort in the home.
How long do replacement windows last?
High quality uPVC and aluminium windows can last 20 to 40 years depending on maintenance, installation quality and exposure to weather conditions. Proper installation is key to long term performance.
Do I need planning permission for replacement windows?
In most cases, no planning permission is required if you are replacing like for like. However, conservation areas and listed buildings may have specific rules under UK building regulations.
Who are Sandymount Windows and Doors?
We are a trusted, independent installer with years of experience supplying and fitting replacement windows, doors and glazing solutions across North Wiltshire, Gloucestershire, Oxfordshire and Bristol. We are FENSA, BFRC and CHAS accredited and proud partners of Origin.
All our installations are completed in house by experienced window installers, ensuring quality control from survey to completion. We offer bespoke window units, long lasting guarantees and aftercare including in warranty repairs.
Our Cirencester showroom allows you to explore our full range of window styles, materials and finishes in person.
