Later still, deep foundations, wider than the walls that they supported, were laid. Some walls were built of stone to a considerable height, probably to the roof, others were only one stone course above the level of the highest floor or surface, above which they carried timber framed mud-brick construction. This latter kind of footing often survives to its original height, indicated by a topmost levelling layer of small, flat, stones on which timber beams rested. All walls were built, in so far as the uncut granitic stone allowed, in level courses and chinked. Generally external surfaces within the urban blocks had well laid stone pavements and drains, both a necessity on a mountain-top subject to violent rain, hail storms and heavy snow fall.
Most buildings appear to have been single storey, reflecting the abundance of space.