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Contract Forms & Options with a Project with significant Refurbishment of a Historical Building

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I am currently working on a project at RIBA Stage 3 which involves the significant refurbishment of a listed building as well as the construction of a new adjoining modern facility.  Due to the nature of the conservation works it will be difficult to quantify the required works and materials into a Bill of Quantities which the contractor could price.  There is the possibility that these quantities could changed so much so that the contractor could not be expected to stand over their initial rate for particular items on the Bill of Quantities.

From the above it was agreed that JCT would be the preferred form of contract to adopt however, to make life more complicated, the client wants to ensure that there is not a rush of CE's left to the end of the project and hence the inclusion of time bars are required. This would then direct we to the direct use of NEC ECC Option B or alternative amending JCT to include time bars or amending the NEC to allow for provisional sum.

I hope that others have faced a similar dilemma in the industry and seek your thoughts on this.
asked Apr 1 in General by Bdevlin15 (120 points)  

1 Answer

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I think that either amending the JCT or NEC to fit your exact requirement is ok. I am not sure why under an Option B you would in fact need to have provision sums as you describe measure changes (which obviously a re-measure contract can cope with). Where the measure increases excessively so the nature of the work changes as you have described then 60.4 provides for this already doesn't it?
answered Apr 11 by Rob Horne (17,210 points)