Sound Structure – Stewart Brand's stated 'basic requirement' is for the core structure, here solid brick and breeze-block throughout, including all the internal walls as well as the external ones, to be strong enough to last and to support any additions.
In practice, these bungalows have even supported an additional floor of accommodation without the need for any special underpinning, and look set to last for centuries; Chris Alexander’s 300 year lifetime test quoted by Brand.
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ment' is for the core structure, here solid brick and breeze-block throughout, including all the internal walls as well as the external ones, to be strong enough to last and to support any additions. 
even supported an additional floor of accommodation without the need for any special underpinning, and look set to last for centuries; Chris Alexander’s 300 year lifetime test quoted by Brand.