I am in the process of finalising plans for our extension before submitting them.
we had planned an extension that is only about 2m deep but all along the back of the house approx 15m long. THs was going to be glazed almost the full lenght, full height with 2 sets of sliding doors.
Reading up a little more tonight i have noticed that you are not usually permitted more than 25% of the new floor area in glazing. Being only 2m deep this means that the glazing is more than 100% of the new floor area. I know i can subtract the existing windows which are to be lost/unexposed. I also understand that i can improve other thermal elements of the existing building to allow additional glass but i need a good calculator for this. Does anyone know of a good free one?
At the same time we will be modifying the roof with 2 new dormas to creat in effect a second floor. DOes this count as an extension with extra floor space as this can offset some of the glazing? If it counts as an extension can it be combined with the rear extension or is it to be treated separatley?
thanks in advance for any guidance
we had planned an extension that is only about 2m deep but all along the back of the house approx 15m long. THs was going to be glazed almost the full lenght, full height with 2 sets of sliding doors.
Reading up a little more tonight i have noticed that you are not usually permitted more than 25% of the new floor area in glazing. Being only 2m deep this means that the glazing is more than 100% of the new floor area. I know i can subtract the existing windows which are to be lost/unexposed. I also understand that i can improve other thermal elements of the existing building to allow additional glass but i need a good calculator for this. Does anyone know of a good free one?
At the same time we will be modifying the roof with 2 new dormas to creat in effect a second floor. DOes this count as an extension with extra floor space as this can offset some of the glazing? If it counts as an extension can it be combined with the rear extension or is it to be treated separatley?
thanks in advance for any guidance