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Electric Opening Polycarbonate Rooflight – Mardome Trade



Please Ensure Sizes Ordered Are Correct – Sizes Cannot be Changed Once The Order Is Processed.

This item is made to order
All prices are subject to 20% VAT

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UK mainland delivery
Fast delivery
Great U values
Sleek, contemporary inside and out
Available in Single Double, Triple Skins and Quad skins
Many sizes available from 600x600mm up to 1800x1800mm
Various dome finishes available
Option to purchase Multiwall PVC kerb
Electrically operated with wall switch or remote

Buy polycarbonate electric opening skylight

This versatile Mardome Trade dome electric hinged rooflight comes in various sizes, and a large range of glazing types and finishes. The low-rising polycarbonate dome is aerodynamic and provides extra ventilation via its electronic hinge on the rooflight. The rooflight caters for all consumer needs, with its customer friendly stylish variations and sought-after options.

We stock a wide range of rooflights and skylights, including opening rooflights, polycarbonate rooflights, and Mardome rooflights, so you’re sure to find something that suits your needs.

What is an electric opening skylight for flat roofs?

Electric polycarbonate opening rooflights are like traditional rooflights, but utilise electric actuators that allow them to open and close with ease. These actuators are controlled with a switch.

Electric opening rooflights are perfect for flat roofs; learn more about which rooflights are good for flat roofs.

Electric opening skylight upstand information

There are three upstand options to choose from:

  • Dome only – fitted on builders upstand (lowest price)
  • 150mm upstand
  • 300mm upstand

Mardome Trade dome electric hinged rooflight benefits

  • The opening feature will improve ventilation in your home or office
  • It’ll increase natural light, which offers a range of health benefits 
  • It’ll likely add value to your property
  • Its aesthetic beauty will make your room more pleasant and comfortable to spend time in
  • It can increase productivity – view the benefits of rooflights in the workplace
  • It’s created using thermally efficient materials, and can save you money on heating and lighting bills – our blog ‘Are Rooflights Energy Efficient?‘ covers this topic in more detail
  • It’s affordably priced

Electric opening rooflight features

  • Various glazing options, from single to quad
  • Comes in a range of sizes
  • Choose between clear, patterned, or opal finishes
  • Choose whether you’d like trickle vents or not
  • Option to purchase a Multiwall PVC kerb

What are the opening options for this rooflight?

There are three opening options to choose from:

  • Mains powered with wall switch (lowest price)
  • Mains powered with remote
  • Mains powered with remote and rain sensor

How much does the Mardome Trade dome electric hinged rooflight cost?

As of December 2022, this Mardome Trade rooflight costs between £386.25 and £2,351.80 excl. VAT. View full guide on skylight costs for more information.

More rooflights

You can also view our:

Measuring & Installation Guide

Please find installation guidelines below. A downloadable PDF link  is at the bottom of this page along with a product data sheet should you require these to assist. 

Range Of Sizes 

If your requirements fall outside of what we supply, we will happily discuss your options and further guide you should you desire. Standard sizes are available in 150mm increments starting at 600x600mm all the way up to 1800x1800mm. 

Instructions To Measure For Builders Upstand Installation

Measure external builders upstand 

Acceptable tolerance: 

• Fixed / unvented domes = dome size +20/-20mm
• Opening / vented domes = dome size +40/-20mm

For example, height of the upstand should be 150mm high and the width should be 75mm if you are fitting on a builders upstand. As demonstrated in red above, your external timber size should match that of your purchased item (drop-down menu on our website) e.g both should be 900x900mm. If you purchase a 900mm by 900mm from the drop down menu on our website your external timber size as shown in red above (Measure here) should be 900mm by 900mm. 

Instructions To Measure for Domes With PVC Kerb

Measure internal roof opening 

Acceptable tolerance = dome size +20/-30mm 

For example, the drop-down menu on our website allows you to choose the measurement you require. If you buy with a 150mm or 300mm high upstand and you buy a 900x900mm from the drop down menu then your timber size (shown above in red) which is your structural opening size should also be 900x900mm.  

TB189 Installtion Mardome Trade Powered Opening(Click here to view PDF)

Technical Information

Glazing Information:



*Centre pane U-value is a measure of the thermal efficiency of the glazing type. 

#Ud-value is a measure of the thermal efficiency of the whole rooflight (calculated in accordance with NARM Technical Document NTD2). 

~Glass glazing option is not available with the access hatch option and limits other opening options depending on size 

Part L Building Regulations require a U-value of at least 2.2W/m2K: Brett Martin Daylight Systems recommend the use of at least triple skin rooflights in all applications 

 Tint Guidelines:

 The light transmission properties of the polycarbonate rooflight are displayed in the table below: 

 Clear – high visibility 

Maximum transmission of light 

Pristine vision of sights and all objects through the dome via maximum clarity 

Opal – diffused light and solar control 

A unique combination of high levels of diffused light transmission  and privacy.  

Ultimate prevention of solar glare and mass reduction of solar heat gain 

Reduced visual capacity by impairing vision through the dome of sights and objects  

Patterned – privacy 

High levels of light transmission combined with personal privacy 

The diffusion of natural daylight 

The heightened impairment of vision through the dome 


Builders upstand (opening / vented) 

The dome comes with a uPVC frame. This attaches to the top of the builders upstand and all housing ventilation/opening equipment. 


 150mm uPVC 

For mounting at roof surface level, providing 150mm of waterproofing height (exact kerb profile varies with specification) 


300mm uPVC 

Typically mounted below roof surface level, to provide 300mm of height for waterproofing and insulation 

 Trickle Vents 

2 manually operated hit and miss trickle vents providing combined 8400mm² equivalent area ventilation. Please note trickle vents cannot be supplied with 450mm by 450mm size. 

TB189 Installation Mardome Trade Powered Opening(Click here to view PDF)


The design life of actuators is at least 10,000 cycles and where present, electrical actuators are guaranteed for 1 year. Our units are guaranteed for a period of 10 years but are anticipated to continue to be fit for purpose beyond this. We expect them not to distort and lose weather-tightness, not to become perforated or lose any major structural efficiency for around 20 years.

Delivery & Lead Time

All sizes below are on a 2-3 working day lead time. For all other sizes, lead time on application. Usually, other sizes will be 3-7 working days but this depends workload.

450×450, 600x600m, 750×750, 900×600, 900×750, 900×900, 1050×600, 1050×750, 1050×1050, 1200×600, 1200×900, 1200×1200, 1350×1050, 1350×1350, 1500×1050, 1500×1500, 1800×900, 1800×1200, 1800×1800

If remote and rain sensor options are selected lead time would be around 5 working days.

Please note that the transport company is not responsible for delivering inside the property. They are not insured to do this so you will need to ensure an appropriate person is designated and on site to offload the product out of the vehicle once the driver arrives. We do not recommenced arranging equipment and installation until the item has been delivered.

Based on 210 reviews
Bob toploft
Bob toploft
I am the owner of Top loft company ltd, after reviewing reviews from various companies I ordered 2 juliet balconies from tgs arrived within 3 weeks, comunications and help was brilliant. Thanks for all your help.
Jim H
Jim H
Great service from the team. Easy to order, good buying guidance and clear install instructions for my builder. Rooflights look absolutely great! The team at TGS couldn't have been more helpful in organising a smaller delivery vehicle to help with restricted access. Highly recommend TGS.
Jack Smith
Jack Smith
Great service from a very knowledgeable company. Thanks team Toughened Glass Systems.
Paul Smith
Paul Smith
I was spending a lot of money on several rooflights so I wanted to make sure I got it right and I did. The professionalism, expertise and the quality of the roof lanterns really set Toughened Glass Systems apart.
Tyrone Eldridge
Tyrone Eldridge
There are no complaints about the experience with TGS. The entire process of ordering, supplying and delivering was flawless. I would really recommend you order your flat roof sky lanterns from these guys.
Robert Childers
Robert Childers
Best place for rooflights, they supply many different types and options. Thanks for all your support Toughened Glass Systems!
John Smith
John Smith
The glass balustrade gives us an amazing view onto the lake outside. So happy we ended up going for the frameless glass balcony from Toughened Glass Systems instead of one with posts
Louise Newsome
Louise Newsome
My job is to design the interiors for a lot of houses and a lot of times the hardest part was when the client wanted some really inexpensive rooflights that should look like some contemporary ones as well. That until I found Toughened Glass Systems and started working with them more and more. They have a lot of this kind of stuff at a very decent price, a price for anyone I can say. If you’re looking for cheap skylights for flat roofs or any types of roof lights, they probably have something for you.
Krystina Taylor
Krystina Taylor
Always kept us up to date with our order even when delayed by a few days. Great service from the start and good quality glass balcony delivered.