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

All Dome Rooflight Manual Opening come with a 2m pole.

To satisfy any customer needs this product is available with lots of glazing options and multiple choice of finish. The Mardome Trade Dome Manual Hinged Rooflight comes in a variety of sizes and is an extremely versatile item. 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.

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.