"There is generally a tone in that sort of aspect of the budget that government wants to try and get the cost of building down," said Mark Lister, head of private wealth research at Craigs Investment Partners. "On the face of it, this is just a very small, sort of fringe issue for Fletcher Building but if it points to a desire to take further steps then it might be something that is spooking a few people.
Steel & Tube Holdings, which also produces construction supplies, slid 2.3 percent to $3.01.
Transport company Mainfreight fell 5.4 percent to $13.05, after it was dropped from the MSCI Small Cap Index after the global benchmark was reweighted for the quarter.
"What you're seeing is people selling because they have to follow a benchmark, so they have to sell by a certain date, regardless of what the company's outlook is, so it is one of those technical anomalies," Lister said.
Conversely, Xero, the cloud-based accounting software firm rose 2.9 percent to $32.78, after it was added to the MSCI Global Standards Index. A2 Milk led the day's gainers, advancing 3.9 percent to 81 cents and Meridian Energy rose 1.7 percent to $1.21 on their inclusion in the small cap index.
Trade Me Group, the online auction site, dropped 5.4 percent to $13.05.
Telecom rose 0.7 percent to $2.71. Air New Zealand slid 2.3 percent to $2.15. Auckland International Airport declined 2.9 percent to $4.015.
Goodman Property Trust advanced 0.5 percent to $1.04, after reporting a 72 percent gain in annual net profit and a move to restructure its governance yesterday.
DNZ Property Fund climbed 0.3 percent to $1.60. Kiwi Income Property Trust gained 0.4 percent to $1.16. Precinct Properties New Zealand rose 0.9 percent to $1.07.
Dual-listed Goodman Fielder, the Australian food company, was unchanged at 73 cents before being halted for a takeover proposal. The maker of Vogels bread rejected a A$1.27 billion takeover offer from the Wilmar International, the world's biggest palm oil processor, and First Pacific Co last month.