Size of roof lanterns

5 years ago

Hi,

I am planning on a 10m x 4m two storey rear extension and a further 10m x 4m ground floor extension. The extra ground floor extension is to be an orangery with roof lanterns. I am planning to have two sets of bi-fold doors along the 10m length (minus 1.5m wall for concrete) opening onto the patio overlooking the garden. There will also be some windows along the 4m wall. Haven't decided the dimensions. Given that the 'orangery' space is 40 sq m, what is the area of roof lanterns that I would be allowed? Thanks.

Featured Answer

minnie101

5 years ago

Hopefully you will get a response from someone with the necessary expertise but it doesn't make sense to me tbh.

I would get to a point with the architect where you're happy with the actual design. Get the company to do the calcs on heat loss, gain etc and then look at all the ways of controlling this with the architect and then submit the plans.

it could be once the calcs are done and you look at the pros and cons in detail (and likely added expense) that you decide large roof lanterns aren't for you?

The architect hopefully should also have a good idea as to what will get through planning in your area.

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Comments (10)

PRO
OnePlan
5 years ago
A quick chat with your architect should give you the answer.
smita_pullela
Original Author
5 years ago
On 40 sq m, he's given us only 7sq m. I think it is too less. From the pictures I see on this site and more, it seems to be possible to have a big roof lantern. I do not know the technical side of this to understand the calculations involved.
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I think you'll come down to two choices. Do you want the roof lantern more than the suspended lighting, or the other way around. As you say, you can't have the suspended lighting with a roof lantern. You may just get one over the kitchen island, but you would have to have the type that's a central pole with three, four or five pendants hung from a horizontal bar, like this Also bear in mind ceiling height. Many people struggle with the hung pendants due to standard height ceilings ( 7'6" ), they're too low for a lot of lights. The beauty for me is in the lantern and that's what you'll love looking at. I think i'd go for the lantern, the pendant bar over the island and then intimate lighting by way of lamps on the Chest in the dining area.
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Good afternoon Andy, We do a frameless and traditional roof lantern We can make one lantern to give the wow factor at 1.5m - 3m, structurally bonded with no metal frame or a more conventional large lantern. These will come with noise reduction glass, solar reflective glass and a self-cleaning coating. If you want to look at more photos or a quote, please contact us, thank you. 1st Folding Sliding Doors
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I see what you mean. I disagree that it will look wrong, I think it's difficult to make it look right. It has to sit well with the rest of the house and that's the hard part. Your current window colour makes things the hardest. To put brown windows in the orangery just won't look nice. Any grey tone would look nice, but then the windows need to match everywhere really. A lovely tasteful shaped orangery in white always looks great, but again, all your windows and doors need to match. I'd extend the patio to, wrapping it around the Orangery and making that the feature point of the rear of the house. I know this is 'grand plans', but hopefully you'll see what i mean.
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PRO
Glazing Vision
5 years ago
Are you set on having a roof lantern? There are so many other options available dependant on what you are trying to achieve? OnePlan is correct, an architect should give you the answer, but potentially you could consider an alternative to a roof lantern?
smita_pullela
Original Author
5 years ago
Thanks for both your replies.

Glazing Vision - what are the other options you are referring to?
PRO
Glazing Vision
5 years ago
You could look into a sliding rooflight which would allow air into the extension, or a fixed frameless flat rooflight for maximum daylight? All of which can be found on our profile and website. If you need more help, please do check out our profile and/or contact us.
minnie101
5 years ago
I agree, you need to speak to your architect. 7m does not sound a lot at all if you want a traditional looking orangery however given the depth of the room, the doors and windows, in theory I doubt you need any type of roof light. My brother built a 8 x 6.5m extension for his kitchen. On the 8m wall he has 5m bifolds and a window either side. He put in 2 lanterns of 3m x 1.8-2m. He designed the extension himself and his one regret of not using an architect isn't he hadn't considered the amount of heat and light that would come through the lanterns. His floor and furniture also started to fade pretty quickly so he recently had UV window film professionally fitted which has helped a lot. His lanterns are motorised. He also has pendant lights fitted in them. He's surrounded by woodland but he has a real issue with flies etc coming through the lanterns. It may also be worth speaking to the architect about lighting if you want a large lantern/s and the fly issue if you want to open the lanterns. There are also different types of glass available with thermal qualities, built in blinds etc which your architect should know all about. Orientation of the room is also key ( his faces south btw) and whether you have large trees/buildings etc blocking light.
smita_pullela
Original Author
5 years ago
Thank you Glazing Vision and minnie for your input. I have spoken to the architect and he said he would make some changes and get back to me. He seems to suggest however that the heat-loss calculation will be done after submission to the planning department. If they or building control question the presence of the amount of glass, then he would approach an independent company to do the math and submit the report and any changes to the plan if required. Is this the best approach - to wait until planning guys raise objections/queries?
PRO
OnePlan
5 years ago
I wonder if that’s unusual that the architect doesn’t do the calcs themselves ?
Orangeries don’t come under the 25% guidelines I think ?!
PRO
Glazing Vision
5 years ago
If you know the type of rooflight you want, including the sizes, we can help with the U Values and the heat loss calculations for that chosen rooflight. We have also written a free guide (i've included a link below) which helps you to understand glass rooflights thermal performance and their contribution to energy efficiency.

Thermal Performance of Glass Rooflights - Free Download

I hope this helps you to get a clearer picture of what is best for your project.

Size of roof lanterns

minnie101

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