Six fire engines from Surrey and Sussex are at the scene of a fire in Copthorne.
A two floor property is on fire in Herons Lane and is being dealt with by fire crews, Surrey Fire and Rescue Service confirmed.
Two engines from Crawley and one from East Grinstead are at the scene, joined by three from Surrey.
Both floors of the building are on fire in a large blaze, according to the fire service, with 75 per cent of the derelict dwelling on fire.
The fire service are currently unable to rule out the possibility that one person is still inside.
Three jets and a hose reel are still being used at the property, which is reported to be 70 metres long and 40 metres wide.
There is a possibility that one part of the building could collapse, the fire service has said.
The cause of the fire is not yet known.
Updates to follow
Don’t miss out on all the latest breaking news where you live.
Here are four ways you can be sure you’ll be amongst the first to know what’s going on.
1) Make our website your homepage at www.crawleyobserver.co.uk
2) Like our Facebook page at www.facebook.com/crawleyobserver
3) Follow us on Twitter @Crawley_Obby
4) Register with us by clicking on ‘sign in’ (top right corner). You can then receive our daily newsletter AND add your point of view to stories that you read here.
And do share with your family and friends - so they don’t miss out!
The Crawley Observer - always the first with your local news.
Be part of it.