Barratt Homes is launching new housing developments in Rushden and Brixworth this month.
Work started in Goulsbra Road, Rushden, on Monday and construction will start in Northampton Road, Brixworth, within the next two weeks.
About 400 jobs are expected to be created during the construction and selling phases.
In Rushden the developer is to build 73 two, three and four-bedroom properties.
The new developments are two of 10 new Barratt Homes projects in the county due to begin within the next 12 months.