You can buy bespoke size rooflights in the UK directly from specialist suppliers like Skylights Roof Lanterns. Simply provide your exact measurements, choose your glazing specification, and the rooflight is made to order and delivered to your door. No standard sizes. No awkward fitting. Just a perfect fit.
Not every roof follows a standard plan. Extensions get built at unusual angles. Older properties have openings that do not match any catalogue size. Loft conversions often leave gaps that off-the-shelf products simply cannot fill. That is exactly where bespoke size rooflights come in and in 2026, ordering one is far simpler than most people expect.
Why Standard Sizes Do Not Always Work?
Off-the-shelf rooflights come in fixed dimensions. Common sizes range from 600 x 600mm up to around 2000 x 1200mm. For many projects, those sizes work perfectly well.
But what if your opening is 780 x 1050mm? Or 1350 x 950mm? You have two choices. You either modify the roof structure to fit the product - which adds cost and labour. Or you order a rooflight made to your exact size.
Bespoke size rooflights is almost always better. It keeps the build clean. It avoids unnecessary structural changes. And it means the rooflight fits flush and performs as it should from day one.
What Are Bespoke Size Rooflights?
Bespoke size rooflights are flat glass rooflights manufactured to your specified dimensions. They are not a niche product. They are a practical solution for any project where standard sizes fall short.
At Skylights Roof Lanterns, our Glass Rooflight Fixed and Custom Sizes range is designed specifically for this purpose. You give us the width and length. We make the rooflight to match. It is that straightforward.
Every bespoke rooflight we make is:
- Manufactured in the UK
- Built to your exact measurements
- Compliant with UK Building Regulations
- Available in double or triple glazing
- Covered by up to a 20-year warranty
Bespoke size rooflights are not more complicated to install than standard ones. They arrive ready to fit. The only difference is that they are made for your opening, not someone else's.
Bespoke Size Rooflights vs Standard Rooflights: Key Differences
|
Feature |
Standard Rooflight |
Bespoke Size Rooflight |
|
Size options |
Fixed catalogue sizes |
Any dimension you need |
|
Lead time |
1–3 working days |
Typically 5–10 working days |
|
Structural changes needed |
Often, if size doesn't match |
Rarely — it fits the existing opening |
|
Price |
Lower starting price |
Slightly higher — varies by size |
|
Returns |
Usually accepted |
Not returnable (made to order) |
|
Best for |
New builds with planned openings |
Renovations, older properties, extensions |
For many renovation projects, the slightly longer lead time on a bespoke rooflight is well worth it. It saves money on structural alterations and gives a cleaner, more professional finish.
What Glazing Options Are Available for Custom Rooflights?
You do not have to compromise on performance just because you need a non-standard size. Bespoke rooflights are available with the same glazing specifications as standard products.
The main options are:
Double Glazing Good thermal performance. Meets current UK Building Regulations. A sensible choice for most projects. Starting from £188 for our custom flat glass range.
Triple Glazing The best thermal performance available. Achieves U-values as low as 0.7 W/m²K. Ideal for high-performance builds or projects prioritising energy efficiency. Our Rooflight Triple Glazed Self Clean range is a popular starting point and for triple-glazed custom sizes, we can accommodate your exact dimensions.
Self-Cleaning Glass A photocatalytic coating breaks down dirt in UV light. Rain then rinses the surface clean. This is a great option for rooflights in hard-to-reach positions - which bespoke installs often are.
Not sure which glazing is right for your project? Our 2026 Rooflight U-Value Guide explains the key differences in plain language.
Common Projects That Need Bespoke Size Rooflights
Most standard rooflight orders come from new builds. But bespoke orders come from a much wider range of projects. Here are the most common ones.
Victorian and Edwardian Extensions Older properties rarely conform to modern standard dimensions. Bespoke rooflights are almost always needed here.
Flat Roof Renovations Replacing an old dome or polycarbonate panel? The existing opening is unlikely to match any current catalogue size. A bespoke flat glass rooflight is the cleanest solution.
Loft Conversions Roof windows in loft conversions are usually pitched. But flat sections on mansard roofs or rear dormers often need a custom flat rooflight. Our Roof Windows collection covers both standard and non-standard options.
Kitchen and Dining Extensions These often feature long, narrow openings designed to run the full width of the room. A single bespoke rooflight across the full span creates a dramatic effect and maximises light.
Commercial and Retail Spaces Offices, studios, and retail fit-outs frequently have non-standard roof structures. Bespoke rooflights allow architects and contractors to specify exactly what they need.
How to Order a Bespoke Rooflight from Skylights Roof Lanterns
The process is simple. Here is what to expect.
Step 1 — Measure your opening Use the guide above. If in doubt, measure twice.
Step 2 — Choose your product and glazing Browse our Rooflights Collection to find the right product type. Select double or triple glazing.
Step 3 — Place your order or contact us For our Glass Rooflight in Fixed and Custom Sizes, you can enter your dimensions directly at checkout. For more complex requirements, contact our team first.
Step 4 — Manufacturing and delivery Your rooflight is made to order in the UK. Most bespoke orders are delivered within 5–10 working days. We will confirm your lead time at point of order.
Step 5 — Install Bespoke rooflights install in the same way as standard ones. Your builder or roofer will not need any special tools or techniques.
Conclusion:
If your roof does not fit a standard size, that is not a problem. It is just a specification. Bespoke size rooflights are available now, manufactured in the UK, and delivered to your site.
Browse our Glass Rooflight Fixed and Custom Sizes product page to get started. Or call 0204 538 3079 and speak to our team directly.
