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Glass Roof Lantern - Brett Martin

  • Now £646.87 (ex. VAT)
Item in Stock   |   Free Next Working Day Delivery (Mon-Fri)
Want it by Tuesday 9th January? Order within 15 hours, 17 minutes and choose FREE Delivery to most of UK (Mon-Fri) at checkout.
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FREE DELIVERY to most of UK See above for delivery estimate

Glass Roof Lantern - key points

This slim and elegant glass roof lantern makes an architectural statement, and floods interior spaces with natural daylight. The gentle pitch emulates the angles and proportions popularised in Georgian hipped roofs. Designed for quick and easy installation, and with a laminated inner pane as standard for the safety of those below, it makes a stunning addition to living and working spaces.

  • Double glazed self-clean glass
  • 4 pane for a contemporary look or 6 pane versions for a more traditional aesthetic
  • 9 sizes
  • Fast delivery
  • Thermal performance exceeds Part L building regulations
  • Made in the UK by Brett Martin
  • 10 year warranty available


Product information

Whether you're and Architect or designer looking to specify for a customer, a home owner considering buying or a contractor looking to supply and fit, you should find all the information you need below - If you get to the bottom of the page and still have questions, please call us on 01937 353 325 (8am-4.30pm Mon-Fri) or email us by clicking here and we'll do our best to help.

Product appearance and construction

Double glazed glass rooflight with slender aluminium frame which is powder-coated grey (RAL9016) on the outside and white (RAL9010) on the inside. It is designed for use on flat roofs and low pitch roofs. The glazing units are made using a toughened safety glass outer pane (tested to comply with BS EN12150 and BS 1279) and a unique laminated inner glass pane. In the event of accidental breakage, the laminated pane will protect from falling glass. The glazing units are angled at 25° on all sizes.

Points to consider when fitting - even if you're not doing the fitting you should read this

Aesthetics, this roof lantern can be fitted on an upstand with a pitch of upto 5 degrees, but please consider this will result in a lopsided appearance. It's the kind of thing you cannot unsee. Homeowners, Architects and designers, please pay attention that it's best to mount this roof lantern on a level upstand, given that a flat roof isn't actually flat. It always has a gentle pitch to aid water disperal runs downhill it does mean whoever builds your roof will need to make some very accurate angled cuts to the bottom edge when creating the upstand. While this is not outside the skillset of some, this kind of attention to detail doesn't come as standard with every contractor. See below for an illustration showing a cross section of the upstand and roof.

Brett Martin Roof Lantern upstand details

The roof lanterns need to be fitted onto a weathered upstand, this is the only time silocone sealant will be needed. All glazing units have factory fitted seals, not additional work required here. Please see below for weights.

  Total unit weight (kg) Max individual pane weight (kg)
Size (mm) 4 Pane 6 Pane 4 Pane 6 Pane
1500 x 1000 70 72 16 8
2000 x 1000 89 91 23 11
2500 x 1000 108 110 31 15
3000 x 1000 127 129 38 19
2000 x 1500 123 127 28 17
2500 x 1500 150 153 40 20
3000 x 1500 176 179 51 25
2500 x 2000 192 196 45 30
3000 x 2000 226 230 61 30


More information on Installation, handling and maintenance can be found at the bottom of this page.

Size information

See below for length and width information, note min width and min. 150mm upstand height required by building regulations.

Brett Martin Roof Lantern size information

Glazing performance and light transmission

All double glazed units use self-clean glass and benefit from a soft coat Low E coating. In winter this helps reflect heat back into the room, in summer it helps keep the room cooler than it would otherwise be. Two glazing options are availaible, clear and blue solar control. Clear glass gives the best light transmission with a higher solar gain (expressed as G-Value). Blue solar control glass has a lower light transmisison but a signifcantly lower solar gain as demonstrated below.

Overall Glazing Performance
Glazing Light Solar Energy
Clear self-clean Transmission 76% G-Value 66%
  Reflectance in/out 17%/17% Shading coefficient 0.76
Blue solar-control Transmission 52% G-Value 46%
  Reflectance in/out 14%/16% Shading coefficient 0.53

Thermal Performance

Varies from 1.86- 2.01 W/m2K - This exceeds Part L Building regulations which requires no higher than 2.2 W/m2K - see page 3 of product datasheet more detail on individual sizes.

Acoustic Performance

Direct airborne sound insulation value of 35db (RW)

Wind and snow loads

Tested to resist wind loads calculated as specified by BS EN 1991-1-4: 2005 and imposed loads in accordance with BS EN 1873: 2005.

Use of blinds

In certain conditions laminated safety glass can experience thermal stress fracture if there is an uneven build up of heat below it. Installation of blinds, or any other alterations made to the lightwell below the rooflight, must be done so with consideration to the risk of thermal stress fracture. In the case of blinds, the risk of thermal stress fracture can never be fully removed, but it can be reduced by choosing light coloured blinds and positioning them as far away from the glass as possible. More detail can be obtained on request - Please contact us and ask for a technical referral.


Brett Martin roof lanterns are expected to remain fit for purpose for 20 years. A 10 year warranty is available.

Installation, handling, maintenance and storage

View / Download Roof Lantern Datasheet
View / Download Roof Lantern Installation instructions
View / Download Glass product care before and after installation
View / Download Glass Daylight for living brochure


Kerbside delivery on Brett Martin's own transport. Glass and frame delivered together on an A-Frame. Driver will assist customer with offloading where required. Sacrificial foam runners protect the glass. A-Frame is taken away by driver.

UK Delivery Zones

The lead times and delivery service are displayed against each product, just below the price.
We will continue to send items on a Next working day delivery, but please accept delivery might take longer, this is out of our control.

Please note, for certain products and delivery zones we can offer AM deliveries and Saturday Deliveries, if available, you'll be able to select and pay for these options via the checkout.

Delivery Charges will be applied for deliveries to geographical  areas represented as Zones C and D:
This includes certain parts of Scotland, Scottish Islands, Northern Ireland, Channel Islands and IOM)

We only supply to Trade Account Customers in Zone E

Cancellations:- Any stock item which is cancelled after having been dispatched, but before you have received it will be subject to a minimum fee of £25.00 + VAT for parcels and a minimum of £70 + VAT for pallets. Bespoke (made to measure) orders cannot be cancelled once ordered.

You can return a standard product (most access panels, loft hatches, accessories and Steel / Aluminium Roof Hatches) within 14 days of receipt. Roof domes, Roof Lights, Glazed Roof Hatches and AOV Smoke Vents will be subject to a collection restocking fee.
Please note Made to measure products cannot be returned.
Click here to download a return form.