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Dome Rooflight Manual Opening



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

Contact Us
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
Manually Operated with a winding pole to open

Buy a manual opening dome rooflight

Our Mardome Trade manual opening dome rooflight will increase natural light and improve ventilation, making your home or office far more comfortable. Beautifully designed, long-lasting, and affordably priced – it’s no wonder the Mardome Trade is such a popular choice in personal and commercial properties.

This product is available in a range of sizes and features. We stock a range of Mardome rooflights, roof domes, and more, so you’re sure to find something that suits you. You can also view our full range of rooflights and skylights.

What is a manual opening dome rooflight?

Manual opening dome rooflghts are typical roof domes that can be opened for ventilation or access purposes. View our full range of opening rooflights.

How does this a Mardome Trade opening roof dome work?

Designed in an aerodynamic shape, the low-rise polycarbonate dome opens manually via it’s operating pole which winds the rooflight open and can be easily closed by hand. All dome manual hinged rooflights come with a 2m pole.

What material is it made out of?

This Mardome Trade roof dome is made out of polycarbonate, a material known for its strength, durability and impact resistance. Polycarbonate is almost unbreakable, and can withstand extreme weather. View our full range of polycarbonate rooflights.

Manual hinged rooflight upstand information

There are three upstand options to choose from:

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

Manual opening dome rooflight benefits

Manual opening dome rooflight features

  • Range of sizes to suit your needs
  • Choose whether you want trickle vents or not
  • Various finishes, including clear, opal, and patterned
  • Various glazing options, from single glazing to quad
  • Option to purchase multiwall PVC Kerb
  • Comes with a winding pole

How much does a manual opening dome rooflight cost?

As of December 2022, this product costs between £298.26 and £1,621.58 excl VAT. View our complete guide on the cost of skylights.

More rooflights

At Toughened Glass Systems, we also sell:

Measuring & Installation Guide

You can find installation guidelines below. A downloadable PDF link is also available at the bottom of this page along with a product data sheet to provide extra assistance.


If your product size doesn’t match our sizes displayed, we offer to assess options to progress if you deem necessary. Standard sizes are available in 150mm increments starting at 600x600mm and go up to 1800x1800mm.

Measuring Guide for fitting to builders upstand

Take external builders upstand measurement

Acceptable tolerance:

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

As an example, if fitting on a builder’s upstand, the width should be 75mm and height of the upstand should be 150mm high. 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.

Measuring Guide for domes with PVC kerb

Take the measurement of the internal roof opening

Acceptable tolerance = dome size +20/-30mm

For example, the drop-down menu on our website allows you to select the measurement you desire. If you purchase with a 150mm or 300mm high upstand and you purchase a 900x900mm from our drop down menu then your structural opening size will be 900x900mm as shown in red above. The timber size as shown in red above (Measure here) should be 900mm by 900mm.

TB188 Installation Mardome Trade Manual Opener (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.


To see the light transmission properties of the polycarbonate rooflight, look at the below table:

Clear – high visibility, Light transmission maximised, Clarity of vision of views and objects through the dome maximised.

Opal – diffused light and solar control, Privacy in tandem with elevated levels of diffused light transmission, Reduced solar heat gain and no solar glare, Restricts sight of views and materials through the dome.

Patterned – privacy, Privacy fused with elevated levels of light transmission, Reduced daylight, Impairs vision of sights and objects through the dome structure.

Builder’s Upstand:

Builders upstand (opening / vented)
Dome is supplied complete with uPVC frame that fixes to top of builders upstand and houses any opening / ventilation equipment.

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

300mm uPVC
For mounting typically below roof surface level, providing 300mm of height for insulation and waterproofing.

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.

Mardome standard fixed dome data sheet(Click here to view PDF)


10 year manufacturers warranty.

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

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.