More than half of all new homes completed in East Sussex over the last two years were built in the Wealden district.
According to new Government figures 1,050 homes were built in the county in 2014/15, down slightly from 1,170 in 2013/14.
The majority of these were constructed in Wealden with 510 finished in 2014/15, down from 670 in 2014/15.
Housebuilding also fell in Eastbourne down from 200 to 70, but rose in Rother from 150 to 160.
The Department for Communities and Local Government did not have complete figures for Hastings or Lewes.
According to the National Housing Federation (NHF), which represents non-profit housing associations in the UK, the total number of homes built in East Sussex in 2014/15 represented a shortfall of 1,503.
Alistair Smyth, external affairs manager for the South East at the NHF, said: “We have a far reaching housing crisis and at its heart is the reality that not nearly enough homes have been built for a generation or more.
“We need urgent action to get more housing of all types built in the South East. Families and young people across the country are crying out for genuinely affordable homes they can rent long term and shared ownership homes to help them on the housing ladder.
“Housing associations are building, but they need a bold government to play its part too and lead the way for new homes. Our new Government has committed to end the housing crisis within a generation, now it must free up land and provide proper investment to make that happen.”
According to the NHF across England, in the four years 2011 to 2014, the total shortfall against the need for new homes totalled 515,340.
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