Take the old and build the new!

(reference to construction for mines in Botswana)

The VDDB approach to old signed-off contracts is not one of “sign and file in the archives” but rather one of “use the actual facts to assist future contracts“.

Following the agreement and finalisation on 9 different civil contracts in Jwaneng, Botswana over a period of 2,5 years the following pointers and lessons are to be learned:

  • Preliminary and General on average, as a percentage varies between 30% and 35% of value of measured work and between 20% and 25% of the final contract value.
  • Contract Variations Requests (CVR) (some projects refer to Site Variation Requests (SVR)) on average, as a percentage, varies between 6,5% and 7,5% of value of original measured work and between 4,5% and 5,5% of the final contract value.
  • A professional approach should be maintained between all parties involved, to secure a trustworthy environment, which will facilitate the final account agreement.
  • The importance of a successful Tender Document and sufficient Bill of Quantities should never be under estimated, if a manageable contract is desired.

The 9 contracts used in this study represents a variety of sectors in the civil industry:

  • Terrace infrastructure
  • Piling
  • Miscellaneous concrete works
  • Earthworks, roads and evaporation dams
  • Linings, epoxy and acid proofing
  • Slide concrete towers of up to 90m high
  • Structural steel installations
  • Sheeting and cladding
  • Multiple concrete structures
  • Building work
  • Gabions and gunite protection
  • Pipelines
  • Fencing

Johan Marx

About Us

VDDB provides project structuring, execution and control services that makes projects predictable and controllable. Some clients prefer the full project office function, including procedures, procurement, contract administration, policies and general project execution and co-ordination, and use selected services.


The concept of analytical quantity surveying is one of numerous enhanced services where traditional skills are merged with information management tooling to provide strongly enhanced project services in a fast world which is keen for optimisation.

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