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Window extensions

Shop by Roof Window Size

Browse VELUX, ECO+, FAKRO, RoofLITE & Heritage roof windows by size

Use our handy chart to shop for roof windows by size. Buy VELUX or FAKRO windows, or discover the massive savings you'll make with VELUX alternatives, such as ECO+ and RoofLITE windows at low prices. Many products are in stock for next day delivery or choose our free delivery service. Don't forget, we price match to ensure you get the best price as well as the perfect fit.

For uninhabited attics, sheds, garages and other outbuildings, use our skylights chart below. To shop flat roof windows by size, check out our rooflights guide.

For help in finding the right size blinds for your roof window, see our Blinds Buying Guide for guidance and inspiration.

Shop for Roof Windows By Size

Standard sizes

HeightWidth
 55cm66cm78cm94cm114cm134cm
55cm   VELUX   
62cm  VELUX    
70cmVELUX     VELUX
78cmVELUX, ECO+, FAKRO, RoofLITE FAKRO   ECO+  
98cmVELUX, ECO+, FAKRO, RoofLITE VELUX, ECO+, FAKRO, RoofLITE VELUX, ECO+, FAKRO, RoofLITE VELUX, FAKRO  VELUX, FAKRO, RoofLITE
118cmVELUX, FAKRO VELUX, FAKRO, RoofLITE VELUX, ECO+, FAKRO, RoofLITE, SterlingbuildVELUX, FAKRO VELUX, ECO+, FAKRO, RoofLITE, 
140cm VELUX VELUX, FAKRO, RoofLITE VELUX, FAKRO, VELUX, FAKRO, RoofLITE, VELUX, RoofLITE,
160cm  VELUX, FAKRO, RoofLITE VELUX, FAKRO VELUX VELUX
180cm  VELUX, FAKRO FAKRO   

Non-standard roof window sizes

HeightWidth
 47cm54cm65cm74cm  
78cmECO+      
98cmVELUX, ECO+      
118cm      
140cm      
160cm      

*Various sizes of conservation windows are available from Heritage, a specialist manufacturer of pitched roof windows for conservation areas.

Shop for Skylights By Size

Skylights are designed for uninhabited spaces, such as your attic, shed, stable or outbuilding. They will add daylight and fresh air into an otherwise stale environment, and, as they come with fitted flashing, they are a cheaper way to get the most out of a space.

Skylights differ from roof windows in not meeting Building Regulations, hence why they are limited in their use. Learn more on this by visiting the Planning Portal.

Don't forget! Not only do we guarantee the lowest prices on all of our sizes, we offer a FREE delivery service too.

HeightWidth
 45cm46cm48cm54cm80cm 90cm
48cm     FENSTRO
55cmFENSTRO FAKRO     
61cm FAKRO     
75cmFENSTRO FAKRO     
80cm    Sterlingbuild  
83cm      
90cm  FENSTRO    
98cm      

What's the difference between roof windows and skylights?

Here is what you need to know regarding your roof window and skylight options with Sterlingbuild.

VELUX sizes

Roof windows

Roof windows flood your loft conversion or extension with lots of daylight, fresh air and a clear view, adding a real impact to your home.

Range of choice

The leading brands offer a range of innovative roof window designs with a solution for every need. Whether your installation is low in the roof and you need head space (opt for a top hung frame) or is high up (opt for a remote controlled model), there is a budget friendly answer for your home improvement project.

Bargain hunters, gadget lovers, design

Are you a bargain hunter, a technophile or looking for the wow factor for your home? Our selection has a roof window for you. We can offer you a window with high quality components at a budget friendly price, the ability to control your windows and blinds from the comfort of your sofa or a stunning feature.

Shop for Roof Windows

Skylights

Skylights are a low-cost way of adding daylight and ventilation to a loft space, garage or shed. They are strictly for uninhabited spaces.

Value for money

Whilst being the UK's cheapest skylight, the models we sell are definitely the best value for money. Their simple, effective and durable design ensure you receive all the benefits of natural light whilst protecting your space from the weather for years to come.

Roof access

If you need roof access, as well as light in your uninhabited space, choose a model that allows easy access onto the roof to perform maintenance work or as an emergency escape.

Shop for Skylights

VELUX skylight sizes