Following an £85,000 reinvestment, The East Street operator will close on 24 May and re-launch in its larger 90-cover site on 28 May.
The existing restaurant is so popular that it is forced to turn away 100 people every weekend in the summer months. On Valentines night this year 180 walk-ins had to be denied a table.
"While it's nice to be full, turning away so many potential customers isn't brilliant business," said restaurant co-owner Minesh Agnihotri.
“By moving next door to our existing premises it means the restaurant will be closer to the sea.”
BigHospitality’s sister title M&C Report reported in 2013 that the restaurant operator eventually hopes to expand across the UK by targeting the lunchtime market.
The new Indian Summer site will open at 70 East Street, Brighton BN1 1HQ.