Foundations are normally required for any new house extensions and make up a substantial part of the overall bill. Any advice about work that needs to be carried out for a new house extension, such as digging foundations can be sought from your architects for home at Ivor St, London NW1 9PL.
The difficulties experienced in foundation creation depend a lot on individual circumstances. Such factors as the degree of sloping around the part of the ground that is going to be used for the extension and the type of material under the top layer of soil are major determinants of how long the foundations will take to be dug out and the materials used and the overall eventual cost involved.
There is a well established sequence of operations that will take place when digging foundations. The first step is to remove any vegetation if it exists. If you have any plants growing in this area that you would like to replant it is worth doing the removal yourself and finding somewhere secure to put them for later. Then the whole extension area plus an added margin of say a metre extra is dug down to a depth which allows the new floor to be laid in line with the floor in the original building. The foundations for the new building’s walls will then be dug out to a sufficient depth to take the weight of the building. Most foundations are simple trenches that are dug in the existing substrate but occasionally extra supports such as piles or anchoring might have to be used if the substrate is particularly soft.
Foundation materials largely depend on the weight and size of the house extension being built. Large extensions normally involve pouring in concrete up to the ground level. When the concrete reaches this level the wall materials such as brick and blocks are built directly onto the concrete.
Smaller extensions do not normally warrant all that concrete and are much more likely to be filled with a bottom layer of cement then with blocks until the ground level s almost reached. The style to be used for the walls with the insulation cavity in between is then used up and beyond the ground level. This type of foundation filling is generally a lot cheaper than filling with all concrete but can take longer for the blocks to be laid whereas it is a lot faster just to pour concrete into the foundation pits.
However the foundation pits are filled in the final extension wall construction will start from the ground level and will normally be built in two parallel vertical sections. The two walls are separated by a cavity which helps to insulate the extension. The outer wall is often built in more attractive or decorative materials while the inner wall will not be visible as it will be covered by plastering and painted or wallpapered so is usually built up by less attractive but more functional materials.
The outer decorative layer is normally brickwork or stone while the inner layer is usually made of breeze blocks or similar which are cheaper and faster to build up.

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