uPVC Vertical Sliding Sash Windows
Design & Order uPVC Sliding Sash Windows Online
From £326 Inc. VAT
If you are looking for uPVC sliding sash windows that are built around your exact requirements, you can design and order everything online with complete control. This is not a standard product where you are forced into fixed sizes or limited choices. Every window is made to order based on the selections you make.
From the moment you start your configuration, you decide how your window will look and perform. You choose the size, the colour finish, the hardware, the glazing specification and the performance level. This gives you a level of flexibility that traditional suppliers simply do not offer.
Choose Your uPVC Sliding Sash Window Range
Not every project requires the same level of specification, which is why our uPVC sliding sash windows are available in four clearly defined ranges. Each range is designed to offer a different balance of cost, flexibility and design detail, allowing you to choose a solution that fits your property and budget without unnecessary complexity.
Design & Order Online
Core Features
Double glazing, toughened safety glass and standard cills included as standard.
Simple Specification
A practical setup focused on the features most customers genuinely need.
Optional Upgrades
Georgian bars, sash horns and additional hardware can still be added where required.
Best For
Straightforward replacements, rental properties and budget-conscious projects.
Essential Range uPVC Sliding Sash Windows
The Essential range is designed to provide a reliable and cost-effective sash window solution while keeping the specification simple and practical. It includes all core features such as double glazing, toughened safety glass and standard cills, along with a clean white finish inside and out.
Rather than removing functionality, this range focuses on what most customers actually need, while still allowing optional upgrades like Georgian bars, sash horns and additional hardware where required.
More Finish Options
Upgrade to woodgrain or bespoke colour finishes for a more tailored final look.
Design Flexibility
Add sash horns, mechanical joints and a wider choice of visual detailing.
Hardware Choice
Select from a broader range of hardware styles and finishes to suit your property.
Best For
Homeowners who want more control over appearance without going fully premium.
Standard Range uPVC Sliding Sash Windows
The Standard range builds on the Essential specification by introducing greater flexibility in both design and performance. It allows you to upgrade to woodgrain or bespoke colour finishes, select from a wider range of hardware options and include additional design features such as sash horns and mechanical joints.
This range is ideal for homeowners who want more control over the final appearance of their windows without moving into a full premium specification, making it the most balanced and widely selected option.
Included Enhancements
Popular upgrades are brought into the standard specification for a stronger finish.
Less Configuration
A more complete solution without needing to build the specification step by step.
Refined Detailing
Includes popular features such as Georgian bars and a full range of hardware finishes.
Best For
Projects where more detail is expected while keeping the selection process simple.
Enhanced Range uPVC Sliding Sash Windows
The Enhanced range is designed to simplify the process of achieving a more refined window by including key features as part of the standard specification. Instead of adding multiple upgrades individually, this range brings together popular enhancements such as Georgian bars and a full range of hardware finishes.
It offers a more complete solution with less configuration required, making it well suited for projects where a higher level of detail is expected but ease of selection is still important.
Authentic Detailing
Created to replicate traditional timber sash windows as closely as possible.
Premium Construction
Mechanical joints, run-through sash horns and deep bottom rails are included.
Complete Finish
Woodgrain finishes, glazing options and a full hardware selection come as standard.
Best For
Period properties and conservation-style projects where authentic appearance matters.
Heritage Range uPVC Sliding Sash Windows
The Heritage range represents the highest level of specification, created to replicate traditional timber sash windows as closely as possible. It includes mechanical joints, run-through sash horns, deep bottom rails and woodgrain finishes as standard, along with a full selection of hardware and glazing options.
This range is ideal for period properties, conservation-style projects and homeowners who want an authentic appearance combined with modern performance.
Built to Replicate Timber, Engineered for Modern Living
Sliding sash windows are known for their traditional appearance, but older timber windows often come with maintenance issues, draughts and poor insulation. Our uPVC sliding sash windows are designed to retain the visual character of traditional sash windows while solving all of those problems.
Traditional Character, Modern Construction
The proportions, detailing and finishes are carefully engineered so that the windows look correct on the property. At the same time, the internal structure uses modern materials and construction methods to improve performance.
Key Design Elements
This combination allows you to maintain the character of your home while upgrading performance.
Compare Our uPVC Sliding Sash Window Ranges
| Feature |  Essential (Entry Tier) | Standard (Core Tier) MOST POPULAR | Enhanced (Upsell Tier) | Heritage (Premium Tier) |
|---|---|---|---|---|
| External Colours | ✓ (White only) | ○ (Woodgrain +£60, Dual +£80, RAL +£200) | ○ (Woodgrain +£60, Dual +£80, RAL +£200) | ✓ (Woodgrain included, RAL optional +£200) |
| Internal Colours | ✓ (White only) | ○ (same pricing) | ○ (same pricing) | ✓ (matching woodgrain) |
| Georgian Bars | ○ | ○ | ✓ | ✓ |
| Sash Horns | ○ | ✓ | ○ | ✓ |
| Trickle Vents | ○ | ✓ | ✓ | ✓ |
| Cills | ✓ | ✓ | ✓ | ✓ |
| Double Glazing | ✓ | ✓ | ✓ | ✓ |
| Toughened Glass bottom sash | ✓ | ✓ | ✓ | ✓ |
| Hardware Colours | ✓ (White only) | ○ (full range) | ✓ (full range included) | ✓ (full range) |
| Pole Eyes | ○ | ○ | ○ | ✓ |
| D-Handles | ○ | ○ | ○ | ✓ |
| Weather Bar | ○ | ○ | ○ | ✓ |
| Mechanical Joints | ○ | ✓ | ✓ | ✓ (fully mechanical frame & sashes) |
| All Sizes | ✓ (no restriction) | ✓ | ✓ | ✓ |
| Slim Midrail | ✕ | ○ | ○ | ○ |
| Deep Bottom Rail | ✕ | ○ | ○ | ✓ |
| Laminated Glass | ✕ | ○ | ○ | ✓ |
| 1.2 U-Value Upgrade | ✕ | ○ | ○ | ✓ |
| Obscure Glass Options | ✓ | ✓ | ✓ | ✓ |
| Heritage Hardware | ✕ | ○ | ○ | ✓ |
| Travel Restrictors | ○ | ○ | ○ | ✓ |
Features
Features of Our uPVC Sliding
Sash Windows
Our uPVC sliding sash windows are designed to bring together the timeless appearance of traditional sash windows with the performance, security and practicality expected from a modern system. Every detail, from the clean finish of the corner joints to the balanced proportions created by slim midrails, a deep bottom rail and run-through sash horns, has been carefully considered to achieve an authentic look without compromising on durability.
As standard, all of our sash windows are supplied with high-performance double glazing, helping to improve insulation and comfort within the home. For added protection and peace of mind, you also have the option to upgrade to toughened or laminated glass, providing enhanced strength, safety and security where required.
Security can be further enhanced with an upgrade to PAS24 certification, offering increased resistance against forced entry and making the windows suitable for projects where higher security standards are needed.
Alongside the core structure, practical features such as secure sash locks, trickle vents for background ventilation, weather bars for improved protection, tilt knobs and a smooth tilt function for easy cleaning all contribute to everyday usability. Styling options such as astragal bars allow you to achieve a more traditional appearance where desired.
In terms of finishes, our uPVC sash windows are supplied in a smooth white finish as standard, giving a clean and classic look. For a more traditional timber-style appearance, you can upgrade to a range of woodgrain finishes, or choose bespoke RAL colour options to match your property both internally and externally.
Use the close-up images below to explore each feature in more detail and see how every element works together to create a sash window that is elegant, practical and built for long-term performance.
Colour Options
Full Colour Options for Complete Design Control
Your windows should match your property, not limit it. That is why we offer an extensive range of colour options, including both standard finishes and realistic woodgrain effects.
All our uPVC sliding sash windows are available in a smooth white finish as standard. If you are looking for a more traditional appearance, you can upgrade to our woodgrain colour options, which replicate the look of timber while maintaining modern performance.
In addition to this, you also have the option to choose dual colour finishes, allowing you to select different colours for the inside and outside of your windows. These are available across our woodgrain range as well as bespoke RAL colour options for a fully customised design.
Smooth white on both the internal and external sides is included at no extra cost. Woodgrain finishes, dual colour options and bespoke RAL colours are available as upgrades, with pricing clearly shown on our live sash windows online designer where you can directly place your order.
Smooth White
Hardware Options
All hardware options are available in a range of finishes, which you can view in the “Hardware Finishes” tab. The finishes are shown on the heritage lock for demonstration purposes, but the same finishes are available across other hardware options as well.
Our hardware range includes functional components such as lift hooks, sash knobs, pole eyes and locking systems, all designed to provide smooth operation, security and a consistent finish throughout your window.
Glass Options
Glazing Options for Performance and Privacy
Glazing is one of the most important aspects of your window, as it directly impacts insulation, safety, noise reduction and privacy. Each of our uPVC sliding sash windows is supplied with a 24mm double glazed unit as standard, which includes argon gas insulation, a warm edge spacer bar and Low E internal glass to maximise thermal efficiency. For enhanced safety, laminated glass is available, which holds together in the event of breakage rather than shattering into sharp fragments. We also offer a range of obscure glass options designed to provide privacy while still allowing natural light into your home, including Bark (Level 5), Satin (Level 5), Contour (Level 3), Stipple (Level 4), Leaf (Level 3) and Westminster (Level 2). For properties located in busier or noisier environments, acoustic glazing can also be specified to help reduce external sound and improve indoor comfort.
Locking and Security
The locking system secures the window by fastening the midrails together. This creates a tight seal while providing strong protection against forced entry.
For enhanced security, a PAS 24 upgrade is available. This includes upgraded locking components and additional security features such as top sash security blocks.
PAS24 Upgrade
Order Your Windows Online Today
You are in full control of your order from start to finish. Configure your windows exactly as needed, choose your size, colour, hardware and glazing, and place your order directly.
Built Within Defined Technical Limits for Performance and Durability
Every window is manufactured within defined technical limits to ensure reliable performance, structural integrity and long-term durability across a wide range of applications.
Clear Specifications, Easier Decision Making
This section gives you a straightforward overview of the key technical limits, construction details and performance ratings for our uPVC sliding sash windows, so you can quickly understand what is included and what works for your project.
Size Limits
Construction Details
Performance Ratings
Need Advice on the Right Specification?
Get an instant quote and let us help you choose the right sliding sash window setup for your property and requirements.
Get an Instant QuoteExceptional Thermal Efficiency
When you invest in new windows, performance is just as important as appearance. Our uPVC sliding sash windows are designed to improve thermal efficiency across your entire home, helping to reduce energy loss and improve comfort throughout the year.
Insulated Frame Design
The multi chamber frame traps air to reduce heat loss and improve insulation.
High Performance Glazing
24mm double glazing with argon gas slows heat transfer and keeps warmth inside.
Enhanced Edge Insulation
Warm edge spacer bars reduce heat loss around glass edges.
Thermal Performance
A-rated as standard with 1.4 U-value. Upgrade available to 1.2 U-value.
See Our Sliding Sash Window Projects
Explore our real sliding sash window installations and see how different finishes, configurations and design details look in completed projects. This gallery is designed to help you visualise the final result and choose the right option for your property with more confidence.
Order Your Windows Online Today
You are in full control of your order from start to finish. Configure your windows exactly as needed, choose your size, colour, hardware and glazing, and place your order directly.
Frequently Asked Questions
Find clear answers to the most common questions about our uPVC sliding sash windows, including how they work, how to order online, delivery, lead times, glazing options and the differences between our available ranges.
uPVC sliding sash windows are vertically opening windows made up of two separate panels, known as sashes, which sit one above the other within the frame. The bottom sash slides upwards and the top sash slides downwards, allowing you to control airflow by opening either section or both together.
Unlike traditional timber sash windows, modern versions are manufactured using durable uPVC profiles. This means you retain the classic sash window design commonly seen in period properties across the UK, while benefiting from improved insulation, enhanced security and minimal maintenance.
Most modern uPVC sash windows also include a tilt function, allowing both sashes to tilt inwards for easy and safe cleaning from inside the property.
At Sliding Sash Windows UK, we offer four ranges so you can choose based on your budget and how much customisation you need.
The Essential range keeps things simple with core features and a white finish.
The Standard range gives you more flexibility with colours, hardware and upgrades.
The Enhanced range includes more features as standard, so you do not have to add them individually.
The Heritage range is fully specified with traditional detailing like mechanical joints and woodgrain finishes, making it ideal for period and conservation-style properties.
Yes, you can design and order your windows directly through our online system. You can select your size, colour, glazing, hardware and upgrades, and see the pricing update live as you build your window.
If you prefer, you can also contact us through our form or email, and our team will help you with your order.
Yes, we deliver nationwide across the UK. There are some areas where delivery may be limited, but we will always confirm this during the order process.
Delivery charges start from £36 and may vary depending on your location.
Our standard lead time for uPVC sliding sash windows is usually between 2 to 3 weeks. This can vary depending on the size of your order, the range you choose and any bespoke options such as special colours or upgraded glazing.
We always recommend measuring the width and height of your window opening from brick to brick or frame to frame. It is important to take multiple measurements and use the smallest size to ensure a proper fit.
If you are unsure, you can contact our team and we will guide you through the process before you place your order.
Yes, replacing timber sash windows with uPVC sliding sash windows is very common. Our windows are designed to replicate the original appearance while improving insulation, security and durability.
For conservation areas or period properties, our Heritage range is specifically designed to maintain the traditional look while meeting modern performance standards.
In many cases, yes. Our Heritage range includes traditional features such as mechanical joints, run-through sash horns and woodgrain finishes, which are often required for conservation-style projects.
However, approval depends on your local authority, so we always recommend checking before placing an order.
We offer a full range of glazing options including standard double glazing, laminated glass for safety, acoustic glass for noise reduction and obscure glass for privacy.
All windows come with high-performance glazing as standard, and upgrades are available depending on your requirements.
Our windows are built with secure locking systems and reinforced profiles. We also offer a PAS 24 security upgrade, which includes enhanced locking and additional security features.
With proper care, uPVC sash windows can last for decades. They are designed to resist weathering, do not rot like timber and require very little maintenance to keep them performing well.
Maintenance is minimal. You do not need to paint or treat the frames like timber windows. Regular cleaning and occasional checks on moving parts are usually enough to keep them in good condition.
Yes, all of our windows can be customised depending on the range you choose. You can select from smooth white, woodgrain finishes, dual colours and bespoke RAL options, along with a full range of hardware and glazing upgrades.
If you are unsure about anything, our team is here to help. You can contact us through the website form or email, and we will guide you through measuring, selecting options and placing your order.