Again, you will have to pay your solicitor and valuer for their time throughout the case. You will also have to pay the landlord’s solicitor’s costs and initial valuation fee (though not valuer’s negotiation costs) from the date you give notice claiming a new lease.  Generally, you will not have to pay your landlord’s costs incurred after you have applied to the tribunal (unless the tribunal thinks there is some pressing reason why you should). Claims are very often settled before a hearing.