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many thanks for those info, It is roughly 20% of the roof area. electric VELUX GGL MK04 centre pivot roof window is considering now. since the patio door and kitchen window is double glazing. so we are advised to use triple glazing just for roof window wont improve the heat pretention? so can...

Please may I get some suggestion of the windows selection. our house currently have double glazing windows, we are going to build a back extension kitchen and living area, in the new pitched roof, will have four roof window 780*980, if chose triple glazing window there, whether it will make any...

Please could you advise how many walls they had to build on edge. Many thanks

sorry, it was not very clear in my question. I am trying to gain some idea of possibility whether can have two walls on eccentric foundation first, before to make decision whether go through the project further. then will approach structure engineer for detail design.

I am planning to have a single storey back extension. due to some restricted situation, and I try to achieve the maximum space as possible. so I am considering to have two walls to use eccentric foundation. one wall is 4.4 meter long, another is 7 meter. if the trench fill foundation 1.3 m deep...