Channel 7's House Rules lags behind The Block Sky High and The Voice in ratings Nick and Chris from Channel 7's "House Rules." HOUSE Rules looks like it is in need of renovation after being hammered by The Block Sky High last night. The launch episode of Channel 7's new home reno reality series could only nail 803,000 viewers nationally. The Block Sky High demolished its rival with 1.308 million viewers nationally. House Rules was also crushed by The Voice which averaged 1.597 million viewers. The House Rules launch result is a blow for Seven. The network had hoped the show, hosted by Johanna Griggs, would strip hundreds of thousands of viewers from its Nine rival. House Rules rated especially poorly in Sydney with only 171,000 viewers - just over half of the 331,000 that watched The Block Sky High. Seven executives will be hoping House Rules figures improve tonight and tomorrow night. Griggs had been upbeat about House Rules chance of success in recent days. "We could not be investing as much time, energy and money into a program if we didn't think it was going to be a success," Griggs said. Nine would be worried that The Voice, despite being last night's number one show, has dropped under 1.6 million viewers for the second night in a row. That figure is way off the more than two and a half million viewers the talent show was averaging last year. The Block contestants Johnno and Trixie Johnson from Queensland have selected the penthouse on level five to renovate. Courtesy The Block, Nine Network.