Hello would anyone be able to tell me if a block slopes slightly down from right to left approximately 400-600m (its also a rectangular size block) would this cost more for building ? Would really appreciate someone helping me out with this information
Hi. I don’t think you mean what you’ve written. You’re describing a cliff if a normal residential block slopes 400-600m If you mean that you have a 400-600m2 block with a slight sideways slope on it then yes it will always cost more to build on than a completely level block. You might have to cut and fill for a slab construction or use bearers & joists which is more expensive.
thank you for your reply. would you have any idea how much extra in site costs this might be ? I read somewhere that it is about 10k per metre so i am assuming it would only be approx 5k extra?
It depends on the width of the block and the house design you choose and if it's over the whole block If the block is 10m wide then that is a steep gradient, if it's 20m wide then it's not as bad and you might be able to use some sloped area rather than make the whole thing flat. Either way it will cost more. Things to consider - a downturn edged slab - this has much thicker footings on the low side so that the slab can support itself and be higher on the low side. The blocks natural layers may be able to stay as is. - cut 200mm out of the high side and retain that area so that there is only 200-400mm fall where the house is and use natural methods for the garden areas. - fill 200mm on the low side and retain so that there is only 200-400mm fall where the house is and use natural methods for the garden areas. - place the garage on the low side and have it lower than the house by 2 courses with a step up to the main level of the house - create a split level house
