Starting a B&B

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What do the PH massive think my chances are of starting a B&B in a rural village close to Welwyn, Herts. Not a lot of local competition it would seem, we had a local hotel The Clock, which closed a few years ago and burnt down today!

We are only a mile from J6 A1, I have lots of off road parking and the accommodation is in a self contained flat with 2 en suite double rooms, tv, wifi, new build so UFH. Lounge, big telly, and kitchen. Breakfast would be a diy affair. Our house is secluded. I could offer airport/station pick ups but I am not sure about car insurance implications.

I could let the rooms on a monthly basis but that would only bring in about £1000, b&b at 30% occupancy (given time) should give me that without having occupants all week. Is this a realistic occupancy rate in say 6 months? I am going to need a marketing strategy!

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Thanks for the comments, much appreciated. I have another benefit, my back wall is directly on the A1 where the traffic slows to a standstill in the evening, so I will stick a B&B sign up there.

I was going to check with the planning (and regarding the signage) but googling leads me to believe that you don't need change of use if the b&b rooms are < 50% of the beds in the house.