Controlling Your Home Construction Budget – Homeowners in Essex Get the Lowdown Construction budgets when clients choose to build their own homes, extend them or add loft conversions don’t always add up. Perhaps we have a budget in mind but the high end finishes or large spaces required to meet our dreams just don’t fit in with our price estimations. It can also be due to the fact we aren’t always aware of the costs associated with design, planning and construction of brand new home builds or adding space to our existing home or property with an extension or loft.