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Additional work arises in two ways: from surprises in the existing building and from changes during construction. You can limit the first and largely prevent the second.
Investigate in advance
Before the final budget, have the foundations, structure, pipes and any asbestos investigated. Every survey costs money, but is cheaper than a construction site at a standstill.
Make choices early
Kitchen, sanitary ware, floors and lighting: the sooner these choices are made, the fewer provisional sums and the more accurate the price.
A clear additional work procedure
Agree that additional work is only carried out after a written, priced order. Keep an overview of all additional and reduced work.
One responsible party
When design and construction are in one hand, there is less discussion about who is responsible for missing details.