West Sussex Fire and Rescue told V2 Radio: "We received a call to a thatched roof fire in Sea Lane, Middleton-on-sea at 14.28pm.
"The property is currently well alight and crews from Littlehampton, Bognor, Chichester, Worthing, Shoreham and Burgess Hill are tackling the blaze, with assistance from the service’s incident command unit.
"Crews are using a compressed air foam system, jets and hose reels to extinguish the fire.
"Sussex Police and SECAmb are also in attendance."
Local businesses have had to close their doors following the news due to the smoke and disruption.
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— West Sussex Fire & Rescue Service (@WestSussexFire) August 10, 2021