The answer to this could not be more simple based upon what you told me about the property and its layout.
It is a straightforward Assured Short hold Tenancy. Now, whilst the tenancy agreement may be quite straightforward, the legalities around it are far from it. There is a whole raft of documentation that you have to give to the prospective tenant including the tenancy agreement, energy performance certificate, gas safety certificate, electrical safety certificate, a government book about renting property in England and if there is a guarantor, the same again to the guarantor. If the tenant is paying deposit, then it has to be registered with an approved Tenants Deposit Scheme. If you don’t comply with all the statutory requirements which really are a minefield and not only a minefield but a minefield which is changing all the time, the chances are that if the tenant does something wrong, or you want to get them out, you will not be able to rely on the usual section 8 or section 21 procedures.
Further, if example you don’t protect the deposit in a scheme, the tenant can sue you for three times the deposit as compensation. Yes, really! If you have a six month tenancy agreement and it has been renewed three or four times, they are entitled to 3 times the deposit for each renewal. Yes really!
For all of these reasons I would urge you to use an experienced letting agent. Note, not just an estate agent one who is an expert in letting properties. Many estate agents think they are the letting experts but their expertise is amateur at best.
Unless you have experience of it, drafting your own tenancy agreement in dealing with the paperwork yourself is a bit like taking your own appendix out: better entrusted to an expert.
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