Avant Homes, which currently employs 530 people, also say that the new developments will create new sales and construction jobs for local people.
The most recent purchase is of a 16 acre site in Newcraighall where the developer has planning permission for 176 family homes.
The other three sites are located in Haddington, Rosewell and Denny.
All four combined have a development value of £200m.
In Haddington 89 new homes will be built at Burnell Park on Aberlady Road. 290 family properties will be delivered at Hawthornden on Gorton Road in Rosewell, whilst 307 homes are being built at Chacefield View off Glasgow Road in Denny.
Managing director of Avant Homes Scotland, David Knight, said: “The purchase of these four new sites represents a significant investment for the business and is part of our ongoing strategy for a major roll out of new developments in 2016 and 2017 taking our current portfolio of developments to seven by the end of the year.
“All will create a significant number of sales and construction jobs over the next two years and form part of our strategic growth plan to increase the number of homes we build in Scotland to 400 units in 2017 and achieve a turnover of £86 million - a 100 per cent increase on 2014.”
The first homes in Chacefield View and Burnell Park are expected to be ready for occupation in the summer, with first completions due at Hawthornden and Newcraighall at the end of the year.
“We have a large strategic land bank and are also currently looking at new land in another four locations which we hope to announce in the coming months,” Mr Knight added.
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