Budgets fluctuate due to currencies and market conditions.  However, risk management and other mitigating circumstances have been forecasted and taken into account to maintain realistic and competitiveness.  In addition, budgets for project phases are isolated from house budgets which are determined by the options chosen from available models, locations etc and will be made available at the appropriate phase in advance of commitment.  The entire project including any overruns is managed by an experienced professional and qualified team.