ᐅ Change in the size of roof windows after building permit approval
Created on: 27 Mar 2019 10:20
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chrisw81
Dear forum members,
We have planned to install four roof windows from Roto in our house (two on each eave side), all sized 65x118 cm (26x46 inches).
I recently visited friends who have similarly sized double casement windows, and the width seemed rather narrow to me.
So my question is... is it even possible to change the size after the building permit / planning permission has been granted? I assume the structural calculations won’t be a big issue, since we have a purlin roof, which should allow a width greater than the rafter spacing without much difficulty.
Now regarding the optimal size... Roto also offers widths of 74 cm (29 inches) and 94 cm (37 inches), and the height can go up to 140 cm (55 inches). I think the height of 118 cm (46 inches) is fine, but would 74 cm (29 inches) width look good, or is 94 cm (37 inches) better? Three of the double casement windows to change are in the rooms Kid1, Kid2, and the bathroom. It would certainly look better to have a more generous amount of natural light rather than a small opening, right? The rooms measure about 360 cm (12 feet) in length along the eave side.
In the hallway, where our fourth double casement window is, we want to install an additional double casement window next to the existing one to make the hallway brighter (this would be a kind of “twin installation,” called “Velux Duo” by the manufacturer).
What do you think about this?
Thanks so much in advance!
We have planned to install four roof windows from Roto in our house (two on each eave side), all sized 65x118 cm (26x46 inches).
I recently visited friends who have similarly sized double casement windows, and the width seemed rather narrow to me.
So my question is... is it even possible to change the size after the building permit / planning permission has been granted? I assume the structural calculations won’t be a big issue, since we have a purlin roof, which should allow a width greater than the rafter spacing without much difficulty.
Now regarding the optimal size... Roto also offers widths of 74 cm (29 inches) and 94 cm (37 inches), and the height can go up to 140 cm (55 inches). I think the height of 118 cm (46 inches) is fine, but would 74 cm (29 inches) width look good, or is 94 cm (37 inches) better? Three of the double casement windows to change are in the rooms Kid1, Kid2, and the bathroom. It would certainly look better to have a more generous amount of natural light rather than a small opening, right? The rooms measure about 360 cm (12 feet) in length along the eave side.
In the hallway, where our fourth double casement window is, we want to install an additional double casement window next to the existing one to make the hallway brighter (this would be a kind of “twin installation,” called “Velux Duo” by the manufacturer).
What do you think about this?
Thanks so much in advance!
chrisw81 schrieb:
Of course, they are only supplementary. No, that's definitely not the case. Your "concerns" would have been valid if these windows were the main source of daylight in their respective rooms, or if they served as emergency exits or chimney sweep access points. But since they only act as a small boost to the light already adequately entering from the gable side, any roof structure tinkering is disproportionate compared to the additional square centimeters of glass area.
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Mottenhausen9 Apr 2019 10:41A matter of personal preference, right? For you, it might not be worth it, but for others, it could be. We don’t know how much a beam replacement costs. After all, you can always replace a long rafter with a shorter one (the longer it is, the significantly more expensive it gets). This requires more structural timber for the beam replacement, but mostly shorter pieces, various brackets and fittings, and labor time, although the hourly wage in this area shouldn’t run into the thousands. We had planned a beam replacement to move the pull-down staircase, but then dropped the idea again. Cost-wise, it was a joke—no kidding!
Mottenhausen schrieb:
A matter of taste, right? For you, it doesn’t seem worth it; for others, maybe it is. We don’t know how much replacing a joist costs. After all, a long rafter can always be replaced by a shorter one (the longer it is, the more expensive it gets). This requires more structural timber for the replacement, but mostly shorter pieces, various brackets and fittings, and labor time, though the hourly wage in this trade shouldn’t run into the thousands. We had planned a replacement to move the folding attic ladder but then dropped the idea. Cost-wise, it was a joke—no kidding! We don’t know the price yet either. It probably depends on how willing the carpenter is and if they have time. They have to get their regular work done, after all.
I also think it won’t be extremely expensive. Our only issue is that the roofer installing the double casement windows needs the measurements before the roof frame is built. If the carpenter resists, the roofer could end up ordering the wrong windows.
I’m currently trying to get a rafter plan and maybe I can contact the carpenter beforehand.
Here, I think it’s less about the cost and more about the effort and coordination.
I spoke with the carpenters, and 74cm (29 inches) wide double casement windows are possible without a lintel. For 94cm (37 inches), a lintel would be necessary. I could easily imagine this in the bathroom; on the south side, we are still undecided—won’t it get too hot in the summer, and wouldn’t the external roller shutter often be closed anyway? The height is 118cm (46 inches) for all of them.
chrisw81 schrieb:
Won't it get too hot in the summer, and won’t the external roller shutter often be closed anyway? I believe we have hardly ever sold double casement windows without any shading.
chrisw81 schrieb:
The height is 118 cm. Actually, it’s 68 cm (27 inches) at 35° pitch.
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