Custom Size Rooflight, Frameless Bespoke Skylight Calculator – Oversized
Original price was: £ 100.00.£ 95.00Current price is: £ 95.00. incl. VAT
📏 Large Skylight Cost – Instant Quote for Oversized Roof Lights
Need pricing for an extra-large skylight or roof window? Our Custom Size Oversized Skylight Calculator gives you an instant quote based on your unique dimensions—perfect for bigger designs that standard options can’t match.
Whether you're working on a spacious extension, commercial project, or want to bring more daylight into open-plan living areas, this tool makes it easy to price frameless roof lights and oversized roof windows. Just enter the width and length you need, and get a tailored cost in seconds.
Designed for architects, contractors, and homeowners who need flexibility without compromising on aesthetics, the calculator offers clear, up-to-date pricing for high-spec, large-format fixed skylights—ideal for flat or low-pitched roofs.
Frameless Skylights Glass Performance
Experience the perfect blend of natural light, energy efficiency, noise reduction, and UV protection with our precision-engineered glass.
Easy to replicate
Installation Guide
Dive into our user-friendly Installation Guide for a smooth skylight setup. Get the clarity you need, step-by-step.
Click below to explore the full guide.
Quick Shipping
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Secure Payment
Shop safely with our secure online checkout.
Easy Returns
Hassle-free returns within 30 days.
10 Year Warranty
Enjoy peace of mind with our extensive warranty.
William Jenkins –
Our vintage home in Stoke-on-Trent has been beautifully modernized with a custom-sized skylight from Regal Glass. Their bespoke service was exactly what we needed for the perfect fit. – William Jenkins
Ava Martin –
Regal Glass transformed our Bradford home with their made-to-measure skylight. The bespoke design fits our unique roofline perfectly and floods our space with light.
Sophia Wilson –
In our Norwich home, we needed a skylight that wasn’t off-the-shelf. Regal Glass’ custom service provided us with a bespoke skylight that fits like a glove and looks stunning.
Connor Prince –
The custom rooflight we had made for our home’s extension is perfect. The team at Regal Glass Group was so helpful in creating a bespoke solution that fits our unique space. Highly recommend their expertise!
Jessica Robson –
I needed a bespoke skylight for my studio’s awkwardly shaped roof, and Regal Glass Group delivered beyond expectations. The natural light has completely transformed my workspace.
Florence Freeman –
The bespoke skylights were the perfect solution for our Edinburgh home’s unique roofline. The quality is top-notch, and the added natural light has brightened up our home beautifully.
Kian Edwards –
Our made-to-measure roof window has been a standout feature in our property’s recent refurbishment.
Henry Keane –
We bought an oversized roof window for our kitchen renovation. It has transformed the space with so much natural light. The window fits perfectly on our flat roof. Delivery was free and on time. Great service!
Jessica Hawthorne –
Purchased an oversized roof window for our dining area. The amount of light it brings in is fantastic. Fits perfectly on our flat roof. Highly recommended!
Michael Collins –
As a builder, I’ve ordered multiple skylights from Regal Glass Group. The latest was an oversized unit with Argon gas-filled spacers, which greatly improves thermal efficiency. Free delivery to London was a bonus. Excellent quality and service!
Emma Preston –
Bought an oversized roof window for our new extension. It has made a huge difference in the amount of light we get. Fits great on our flat roof. The delivery was free and on time. Very pleased with the purchase.
Emma Preston
Benjamin Foster –
We recently bought an oversized roof window for our attic. It’s made a huge difference, letting in loads of natural light. The window was easy to install on our pitched roof. Delivery was free and quick. Very happy!
Adam Rogers –
Purchased an oversized roof window for our dining area. The Argon gas-filled spacers and triple glazing provide excellent insulation. The self-cleaning feature is fantastic. Free delivery to Glasgow was on time. Highly recommended!
James Parker –
Bought an oversized roof window for our attic. The thermal efficiency and sound reduction are fantastic. The self-cleaning feature keeps it looking great. Delivery was free to Oxford and quick. Very happy with the product and service.
Thomas Watson –
We purchased a triple-glazed custom roof window for our loft. The thermal efficiency is incredible – the 0.9 W/m²K U-value makes a noticeable difference. The installation was straightforward, and the frameless design looks sleek. Delivery was free to Liverpool and on time. Highly recommend Regal Glass Group for their high-quality products and excellent service.
Oliver Turner –
As a builder, I’ve ordered multiple roof windows from Regal Glass Group. The latest one was a walk-on window for a client’s project. It arrived quickly and the quality is outstanding.
Harry Mitchell –
Installed an oversized roof window in our new extension. The 15mm warm Edge spacer filled with Argon gas is great for reducing heat transfer. The product is also CE marked, ensuring top quality. Free delivery to Glasgow was on time. Very pleased with the purchase.
Jessica Williams –
I am very happy with the flat roof windows. The quality is premium and the delivery was very fast. Thank you!
Sophie Taylor –
The flat roof windows arrived in perfect condition and the quality is exceptional. Very good purchase.
Thomas Jones –
The flat roof windows have changed the light in our house. The customer service is very efficient.
Matthew Wilson –
The quality of the flat roof windows is incredible. The customer service is very friendly and professional.
Holly Morgan –
The made to measure roof light has brightened up our entire loft. It fits perfectly, and the room feels much more spacious now.
Ryan Parker –
Couldn’t be happier with the bespoke roof windows we ordered. They bring in loads of natural light and have transformed the look of our home.
James Carrimor –
The frameless bespoke skylight we installed in our kitchen is stunning. It adds so much light and gives the space a modern feel.