Victorian & Edwardian
Victorian and Edwardian Homes
Sympathetic shaped designs that keep period charm—ideal for arches, bays, stairwells and feature openings.
Shaped Windows
Supply Only | Supply & Fit
Custom Double Glazed Windows Designed for Unique Architectural Openings
Not every property is built around straight lines. Period homes, loft conversions, and modern architectural extensions often feature curved, angled, or unusual openings that standard windows simply cannot accommodate.
At Colin’s Sash Windows, we specialise in designing and delivering bespoke shaped windows, carefully crafted to follow the exact structure of your home while delivering modern energy efficiency, security, and long-term performance.
Whether restoring a heritage property or enhancing a contemporary design, shaped windows transform challenging spaces into striking architectural features filled with natural light.
What Are Shaped Windows?
Shaped windows are windows manufactured in non-standard designs, meaning they are not square or rectangular. Instead, they are built to match the exact outline of an architectural opening such as arches, triangles, circles, or angled rooflines.
Often referred to as odd shaped windows, unusual shaped windows, or specialty shaped windows, these bespoke units are individually produced to ensure structural strength, weather resistance, and visual balance with the property.
Common shaped window styles includes arch shaped windows, triangle shaped windows, circular or eye-shaped windows, Gable and apex windows, Diamond or angled designs. These window styles are widely used to enhance character, maximise natural light, and preserve traditional architectural details within UK homes. Curved and triangular designs are particularly popular for adding decorative impact while improving daylight penetration in otherwise difficult spaces
Our Popular Types of Shaped Windows
Our shaped windows online are available in different shapes including circle, triangle, gable and eye shaped windows each offering distinct advantages in performance, design flexibility, and long-term maintenance.
Arched Shaped Windows
A timeless choice seen across Victorian and Edwardian architecture. The soft curved head introduces elegance while increasing the perceived height of a room. Arched windows are widely used in heritage buildings and stairwells
Triangle & Apex Windows
Triangle shaped uPVC or aluminium windows are especially popular in loft spaces and contemporary homes, allowing light into roof areas where rectangular frames cannot fit.
Gable Windows
Installed at the highest point of a property, gable windows create dramatic glazing features and maximise daylight in open-plan interiors.
Circular & Eye-Shaped Windows
Often used as feature glazing in hallways or bathrooms, circular windows provide visual interest while maintaining privacy./p>
Custom Combination Designs
Shaped windows can be combined with sliding sash or casement frames to create balanced elevations, particularly in period renovations.
Available Materials
We manufacture shaped windows using the same premium materials available across our full double glazing window range.
Timber Shaped Windows
Ideal for conservation areas and heritage properties where authenticity matters. Timber frames pair naturally with traditional sash window designs.
uPVC Shaped Windows
Energy efficient, low maintenance, and cost-effective. A popular choice for homeowners replacing ageing unusual shaped windows.
Aluminium Shaped Windows
Slim, strong profiles allow larger glazing areas and contemporary aesthetics, perfect for complex architectural designs.
Transform Unusual Spaces into Architectural Features
Awkward openings don’t need to limit your home’s design potential. Shaped windows are commonly installed in:
Because we supply both sash windows and casement windows, shaped units can be seamlessly integrated above or alongside standard window styles to maintain consistent proportions across your property.
Colours, Finishes & Hardware Options
Our shaped windows are available in a wide range of colours and finishes to suit both traditional and modern properties.
Popular colour options include: White, Anthracite Grey, Chartwell Green, Woodgrain finishes such as oak and rosewood, or Dual-colour foils (different internal and external colours).
Popular colour options include: White, Anthracite Grey, Chartwell Greeou can also choose from a variety of hardware options to match your preferred style, including lift Hooks, Pole Eyes, Locking Systems, Tilt Mechanism, Travel Restrictors, D handle, & Sash Knob.
uPVC Shaped Windows Colours Options
Shaped Casement Windows Colours Options
Heritage expertise
Shaped Windows for Period & Conservation Properties
This is where Colin’s Sash Windows stands apart. We design shaped glazing to suit the proportions, sightlines, and character of traditional British architecture—without losing modern performance.
Listed & Conservation
Listed & Conservation Properties
Designed with traditional proportions in mind, helping you achieve a heritage look with modern double glazing options.
Barn Conversions
Barn Conversions & Heritage Restorations
Statement gable and apex glazing that floods roof spaces with light while respecting the building’s original character.
Why it matters: our expertise in traditional sash proportions ensures shaped designs complement original
architecture rather than overpower it—so the finished result looks “right” from every angle.
Shaped Windows
BFRC Energy Rating Comparison
The British Fenestration Rating Council (BFRC) evaluates windows on a scale from A++ to G. Our double-glazed shaped windows achieve highly competitive ratings, with all units independently tested and certified by BFRC. This information helps you understand the energy efficiency of your windows before purchasing or replacing them. View the detailed window energy efficiency ratings below.
| Window Material | Typical BFRC Rating* | Typical U-Value (W/m²K) | Performance Notes |
|---|---|---|---|
| uPVC | A – A+ | ≈ 1.2 – 1.4 | Multi-chambered uPVC profiles with Argon-filled double glazing and Low-E glass usually deliver the best overall insulation and energy efficiency. |
| Timber (Wooden) | B – A | ≈ 1.3 – 1.5 | Timber is naturally insulating and ideal for conservation and period properties. Performance depends on timber thickness, glazing specification and external paint or stain finish. |
| Aluminium | B | ≈ 1.4 – 1.6 | Modern aluminium frames use thermal breaks to achieve good U-values. Slim sightlines maximise glass area and light while still meeting current energy-efficiency standards. |
*Typical ratings shown for modern double glazed specifications. Exact BFRC ratings and U-values depend on final glass, spacer and frame configuration chosen for your project.
Energy Efficiency Without Compromise
Despite their bespoke form, shaped windows achieve excellent thermal performance using modern glazing technology:
- Argon gas filled double glazing
- Warm edge spacer bars
- Precision weather sealing
- Low-E energy efficient glass
Modern double glazing helps reduce heat loss and improve indoor comfort, with standard UK window systems starting from around £200–£700 depending on specification
To Get Value For Money
Choose Colin's Sash Windows
10 Years Gaurantee
All our shaped windows come with a 10 year guarantee
Made in Britain
Our shaped windows in uPVC and aluminium are made in Britain
We Match Your Price
If you have got a cheaper price from any other supplier then we are ready to match the price.
How Much Do Shaped Windows Cost in the UK?
Because shaped windows are bespoke, pricing varies more than standard window designs. Below is a typical UK market guide to help homeowners understand expected investment levels.
| Material | Typical Installed Price Range |
|---|---|
| uPVC Shaped Windows | £600 – £1,500 |
| Aluminium Shaped Windows | £900 – £2,500 |
| Timber Shaped Windows | £1,200 – £3,500+ |
Standard uPVC windows typically range between £240 – £1,240, while bespoke shaped
designs cost more due to specialist manufacturing, precision forming, and installation requirements.
What Affects the Price?
Shape complexity
Window size
Frame material selection
Glazing specification
Installation access
Conservation or heritage requirements
For example, triangle shaped uPVC windows are often among the most cost-effective bespoke options, while large timber gable windows require more detailed craftsmanship and specialist installation.
Calculate the Cost of Shaped Windows
Get a fast, accurate estimate modern shaped windows in just 60 seconds using our double glazing cost calculator. No sign-up, no obligation – simply enter your details and see your tailored price.
Instant personalised estimate
Free & no-obligation quote
Includes installation or supply-only options
Benefits Of Buying
Shaped Windows Online From Us
Buying made to measure shaped windows from us means you’re not only getting new windows, you’re also securing all the added benefits that come with Colin’s Sash Windows. We aim to earn your full trust, which is why the advantages of our double glazed shaped windows truly set us apart from other suppliers.
Energy Efficiency
Our shaped windows are manufactured with Low-E coated glass, argon gas filling, and warm edge spacer bars to enhance insulation and minimise heat loss. Thanks to these energy-efficient features, most configurations achieve U-values between 1.2 and 1.4 W/m²K. This results in improved indoor comfort and reduced heating costs compared to single glazing.
Security
Our shaped window units are built with double-glazed glass and reinforced uPVC frames to provide enhanced resistance against forced entry. Multi-point locking systems come as standard, with PAS 24 compliant hardware available for new build projects. This ensures long-term security and reliable protection for your home.
Condensation Control
The warm internal surface created by Low-E glass, argon gas-filled cavities, and warm edge spacer bars helps to reduce the risk of internal condensation. This minimises the chance of mould, damp, and moisture-related damage, while enhancing everyday comfort, particularly in older properties.
Acoustic Insulation
Our shaped window glazing systems are designed to reduce external noise by 20 to 35 decibels, depending on the selected configuration. Laminated or asymmetric glass options can provide even higher levels of sound insulation, making them ideal for homes in busy areas. The result is a quieter, more peaceful living environment.
Ventilation Integration
Our shaped windows include trickle vents where required, with ventilation options tailored to suit each design. Opening configurations can incorporate secure night vent positions, allowing controlled airflow without compromising security. All ventilation provisions are sized and specified to ensure compliance with Document F regulations.
Unmatched Guarantees
Our shaped windows are supplied with comprehensive guarantees to provide long-term peace of mind. Each installation includes both product and workmanship cover, ensuring your windows continue to perform at their best. This protects your investment and delivers lasting reliability for years to come.
Accreditations
Our shaped windows hold certifications from over twelve recognised UK organisations for quality, safety, and performance. These accreditations demonstrate compliance with strict national standards and provide reassurance that every unit is manufactured and installed to an exceptional level.
Largest Double Glazing UK Suppliers
Colin’s Sash Windows is one of the UK’s leading suppliers of shaped and double glazed windows. Our scale enables us to provide consistent quality, dependable service, and competitive pricing. Homeowners benefit from our extensive experience and systems trusted across thousands of properties nationwide.
Real Images Of Our
Shaped Windows In UK Homes
Shaped Windows Buying Guides
Areas We Deliver
Supply and installation are available nationwide in most areas across the UK. Request a quote with your
postcode and project details to confirm survey dates and lead times. We have the lowest leads times of 2-3 weeks
approx. for all our Shaped Windows.
For delivery of our Shaped Windows, please refer to the map below. Deliveries to areas highlighted in green are charged at £36. Areas marked in yellow incur a delivery fee of £120 or more; for these locations, please contact our sales team first so we can confirm availability and the exact delivery cost. Unfortunately, we do not deliver to areas shown in red.
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Can shaped windows open?
Some designs are fixed, while others integrate opening sash or casement sections.
Are shaped windows energy efficient?
Yes — modern glazing allows performance comparable to standard windows.
Can shaped windows match sash windows?
Absolutely. Many shaped units are designed specifically to complement sliding sash windows.
Are shaped windows suitable for conservation areas?
Timber shaped windows are often approved where sympathetic designs are required.
Ready to Get Started?
If you’re considering new shaped windows or replacing existing ones, contact Colin’s Sash Windows today for a free, no-obligation quote and expert advice tailored to your property.
Get in Touch At Once!
Feel free to call us on 01525 552131. Our friendly sales advisors will guide you through the ordering process and help you with anything regarding double glazed windows. Alternatively, don’t hesitate to write us via the contact form or directly to our email address sales@colinssashwindows.co.uk. Don’t waste your time and take advantage of the finest quotes throughout the UK and Ireland.
