New Zealand Structures & Investments Ltd v McKenzie - [1983] NZLR 298

Building contracts, engineers and architects — Authority of Engineer — Variations — Extension of time — Fixed price agreement signed on NZSS form 623 — Owner's engineer and engineer's representative authorised extras increasing costs — Whether delegation to representative valid — Whether extras validly authorised — Whether engineer can grant extension of time after completion date — Appeal from [1979] 1 NZLR 515.