Retaining mature trees can add a lot to the ‘amenity value’ of a property, while helping to mollify planners and disgruntled neighbours. However, sloping sites can provide an opportunity for adding extra space by incorporating a basement as a cost-effective way to fill the void when building out above ground level. This will reduce the amount of excavation, although it can still add as much as 10 per cent to your overall build cost. The compromise method is to fit the house to the slope with a series of steps creating a split-level layout. Both options are likely to add upwards of £5,000 to your groundwork costs. Alternatively you might decide to extend the building outwards with supporting walls constructed under the raised area.
One option is to build into the hill, excavating to create a level base. In high-rise buildings, these kinds of foundations can be several metres thick with extensive reinforcing that must be specially designed and installed to ensure loads are evenly transferred to the ground.The biggest decision, however, is where to position the building. In commercial buildings, mat foundations often involve deep excavations and large amounts of concrete and steel reinforcing. In either case, the mat foundation spreads the load Mat foundations can be constructed near the surface or well below ground, depending on the size of the building. Mat foundationsĪ mat foundation, often referred to as a raft foundation, is a variety of heavily reinforced slab-on-ground foundation that is used to distribute large structural and seismic loads across a wide area. In commercial buildings, shallow foundations are commonly combined with ground-improvement techniques to increase the bearing strength of the soil below the foundation. A shallow foundation transfers loads from a building into the upper layers of the ground rather than to a deeper soil or stratum like a deep foundation.
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