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When you think of a skylight or a roof light, you would understandably imagine them on the roof of a building, letting in natural daylight from above.

However, they are now being used in more dynamic and interesting ways internally, particularly in commercial buildings. Domestic properties are also beginning to adopt them in order to add a contemporary look to the space.

Let’s take a look at the key questions and considerations to be made in order to introduce this unique and exciting interior trend to your home.

What is an internal skylight?

An internal skylight is a Walk On unit that has been installed within a property across two storeys or as a glass floor panel. The pane allows you to see into the floor below, or above depending on your location.

Where and how are they used?

The most common use tends to be within tourist attractions to allow for exciting views from great heights or to expose an interesting perspective on architectural design.

For example, if you have ever taken a trip to Portsmouth, you may be familiar with this view of the Spinnaker Tower.

At a first glance, this might seem like an unusual feature to add to your living space, but there are actually many fantastic benefits involved.

So what are the benefits?

If you want sunlight to flow naturally through your house, Walk On roof lights are an ideal solution, as they will introduce the light from the room above, to the room below with ease. This is perfect for buildings with cellars or basements which might otherwise be quite dark and dingy.

The knock-on effect of increasing natural light flow in your home is that you will rely less on artificial lighting to keep rooms illuminated, which will help to significantly save money on electricity bills.

In addition to this, Walk On units can instantly add a more modern look to your living room, kitchen or dining space. They can also expose interesting architectural elements to your building, such as traditional style beams, and are a great talking point too!

Are they safe?

This is always a popular question for anyone investing in a skylight. However, there is no need to be concerned as our frames and panes have been specially developed and tested to the highest safety standards.

The glass used for our Walk On roof lights is incredibly strong and hardwearing, with 50mm double glazing as standard, including a 25mm toughened and heat strengthened outer pane and 8.8mm laminated inner pane. You can read more about the different glass types in this blog post.

This means that the likelihood that the panel should break is incredibly unlikely, with the product able to support loads of up to 500kg per square metre.

Tip: Glass can get slippery – unless it’s covered in a non-slip coating. Whenever you are purchasing a Walk On unit, it is recommended that you always ask for this extra to be applied.

The frames protecting the pane and securing it in place are made of tough coated aluminium, with an insulated timber upstand included.

The glass and frame finish flush with the surface, so there’s no risk of tripping hazards either.

All of our products also come with a 10 year warranty for your peace of mind. 

How do I pick the right unit?

There are a few considerations to bear in mind when choosing the right skylight. Before considering the size, shape and style, you need to know that your unit is going to be efficient, and has been tested to the highest specifications.

So what should it be tested for?

Water Tightness

Although leaking is more of a concern for external roof lights, it is still important to know that your product is able to resist leakage.

Water Tightness is tested and classed between a rating of 1 to 4 with 1 being the lowest. Our Walk On units all pass with flying colours at a class of 4.

Air Tightness

To prevent loss of heat or any draughts making their way through, each product is tested for air tightness (or permeability).

This is classed in measures of pa (Pascal) which determines the amount of air pressure that can be applied. The ratings are between 150pa and 600pa. Once again, our units are top of the class at 600pa.

Sound Insulation

Sound is measured in decibels (dB). Our units resulted in a measurement of 34dB sound reduction. This means if, for example, if the sound levels on one side of the glass are at 60db, the pane will reduce this by 34dB.

Thermal Insulation

Otherwise known as thermal transmittance, this is measured by U-Value – the lower the number the more efficient, making ours incredibly competitive and way below the building regulations standard at 1.24W/m2K (watts per square metre, per degree Kevin).

All of our products are also certified for each of these tests by CE marking, DS certification and by the DS/EN quality system.

Read about our certifications on our Glossary page.

What size and shape should I opt for?

First, you need to think about what the purpose of the unit is before deciding this. If it is primarily aesthetic, then what shape and style would you like it to be?

Whilst the units come in standard sizes for structural openings, with a little creativity you can create any shape you desire by working with a contractor in designing the structural opening frame.

On the other hand, if it will primarily serve as a source of light for the storey below, you must make sure that it is large enough to accommodate the light access, whilst ensuring you have enough space when factoring in furniture and overall area dimensions.

What sizes are available?

Our units are available in four standard sizes to suit structural openings of:

  • 1000mm x 1000mm
  • 1000mm x 1500mm
  • 1000mm x 2000mm

Alternatively you can choose a bespoke made to measure size.

Do internal skylights require cleaning?

Like any skylight, Walk On units are very low maintenance.

If there are any smudges on the glass, you can use a standard cleaner to wipe these away – just avoid any strong chemicals as these can corrode coatings. The frame can also be cleaned if required by using warm soapy water.

Tip: Always use a lint free cloth for cleaning, and avoid tough scrubs or scours.

For more information about our Walk On roof lights, click here. Have any further questions about adding internal units to your home? Head on over to our Contact page to get in touch or take a look at our Fixed, Opening, Eco, or WalkOn Rooflights pages for more information and to see our stock sizes.

Spinnaker Tower glass floor image from Wikimedia via Creative Commons

Want to Know More?

If you are interested in a Walk On rooflight you can learn more by clicking below. See technical details, thermal performance and prices for our Walk On system.

Click Here

4.81 Average

129 Reviews

Rob O Carroll

Fantastic. Product really well made. And. Finished to very high standard

Posted 2 weeks ago


We were very pleased to find a stock rooflight which matched our requirements. The product has only just gone in but so far so good.

Posted 1 month ago

Nick Puxted

I found The sales person very helpful with our bespoke design. The roof light was delivered on time and we are very happy with the product.

Posted 1 month ago

Paul Anderson

from start to finish the service provided was friendly, helpful and professional. we are extremely pleased with the product, looks great and will definitely be using EOS in the future.

Posted 1 month ago


We ordered a rooflight, the staff were very helpful and giving an appropriate advice. Quick delivery and i’m very happy with the product. Defenitly Recomended

Posted 1 month ago

Sean Barrett

The people we dealt with on the phone were both polite and very helpful with our order, dealing with the whole process very efficently. The rooflights were delivered to site and our customers were very pleased with them once installed and the effect of such extra light into the extension. We would recommend EOS Rooflights as did visit other manufacturers prior to ordering them but found them to be a superior product overall.

Posted 1 month ago


The were very good at keeping you informed as to when the product was to be delivered even down to approx time of the day, very good and would use them again.

Posted 1 month ago


No complaints so far. Rooflights look great and arrived as promised.

Posted 1 month ago

Vassos Costas

I looked at quite a few of the competitors roof windows and none compared to the quality of EOS Rooflights. In situ, they look fantastic. I wanted to construct my own insulated up stands and the sales team at EOS provided plenty of quick technical info to assist. I also need to delay my order and EOS kindly agreed to store a large roof window for a couple of weeks until I had space on the job site. If you are planning to construct your own insulated up stands, beware of the amount of time it will take you or your carpenter and factor this cost against buying the up stands from EOS (you will need an onsite table saw, unless you have a workshop and adequate space for a glue up). Make sure you have a plan on how you are going to get the roof window to its final location prior to purchase-one of mine was 2.8m long and weighed circa 250kg-I had a relatively easy route to the installation point , but I doubt this will always be the case.

Posted 1 month ago


Very nice product, competitive prices and very professional communication. Having researched many similar products, I am very happy to have chosen EOS!

Posted 2 months ago

Peter Kent

From the outset I received excellent service. I enquired about fixed, opening and bespoke roof lights , both Elliot and Chris provided all the information I required. The order was placed and the deliveries were made on time. Following delivery I raised a couple of installation queries and received a speedy response. Very happy with rooflights, and Eos

Posted 2 months ago


Excellent product & service

Posted 2 months ago

Simon Grayson

Great company to use - very helpful with pre-order enquiries, and we’re very accommodating when organising delivery dates and details. I would be happy to recommend EoS.

Posted 4 months ago

Nuno Bernardes

Very easy transaction, great product and delivery service was fantastic. Only constructive feedback I can give is to better highlight the weight of the product and that can/will cause issues with delivery and installation. Luckily we had 6 builders on site who between them managed to move the £140kg roof light but what that meant is that we had to pay extra to re-enforce the roof with different beams

Posted 4 months ago


Very good product and also very good customer support I received from Elliot at EOS. I highly recommend it.

Posted 4 months ago

Pat Barry

Very easy to deal with and delivered on-time.

Posted 4 months ago


We were very happy with how efficiently the work was carried out.

Posted 5 months ago

Moni Liu

"Bought 2 flat glass skylights from you, You're all very helpful on the phone answering all my questions.\r\nThe skylights fit brilliantly and they are very sturdy!\r\nOur builders were surprised with their quality. \r\nPrices are very good too!\r\nThank you!"

Posted 5 months ago

Simon White-Miller

Service was good and delivery prompt and actually arrived the day they said it would

Posted 5 months ago

James Fraser

We have been dealing with EOS for over a year now and its always a pleasure. The team are always very quick to answer any questions and the information given is always accurate and really helpful. Quotes are always set out clearly and easy to understand which helps us greatly. The products always arrive well packaged and when there has been any issues at all they have been solved quickly and brilliantly. The products they produce are excellent with a customer service to match that! look forward to doing more business with EOS in the future! Thank you.

Posted 5 months ago

Altan Riccardo

Customer Service is great! Roof lights are great! Reasonably Priced!

Posted 5 months ago