Also the house builder has ramped up production at its timber-frame Space4 factory to meet fast rising demand and production levels are 25% ahead of last year.
Persimmon said forward sales beyond 2013 were 41% up compared to the same time last year at £650m and it had now sold 3,000 homes under the Help to Buy scheme since it was introduced last April.
In a trading update it said: “The improvement in build efficiency captured by this modern method of construction is helping us to respond to the improved sales rates we are experiencing while also providing further benefits of cost control on site.
“We have also been encouraged by the support provided by our suppliers and sub-contractors to our increased build requirements and look forward to the further development of these long term relationships as they grow in partnership with Persimmon.”
Persimmon said it had now successfully opened 65 of the 85 new sites identified for the second half of the year to refresh and maintain its national network of 385 sites.
“These new sites have delivered encouraging reservation rates and will support further margin expansion in the future.
“We anticipate the number of sites in our network will increase towards 400 outlets by the end of the year.”