The neighbour is certainly entitled to something in respect of the disruption to his property and inconvenience which he agreed was going to be 12 weeks but is now it seems running into probably 18 weeks.
On a strict interpretation, and looking at this as though it’s a contract, there was an agreement for you to have it in place for the longer period in exchange for the gates. There was an offer of the gates in exchange for the consent and he accepted it. Hence there is an agreement, there is consideration of value and therefore he is bound by what he agreed.
Of course, this was a verbal and he can deny that.
If he is minded, he can say that (lie) it was only ever for a 12 week period and that he wants it gone and if you don’t move it within the next few days, he will apply to court for an injunction and legal costs, to make you remove it. That’s the risk.
If the court believe him, he will get the injunction and he will get costs awarded against you and that’s likely to be more than £1500. If you defend the action, your solicitors costs allowed are going to be several thousand pounds. If you lose, you would have to pay your loan solicitors cost plus his solicitors cost. He may not have the money to take the matter to court or the wish but it’s a risk.
Strictly speaking, he is entitled to nothing but it’s going to be cheaper to come to a financial arrangement with him that it is to risk going to court and ultimately deal with the court proceedings. I would probably offer him half of what he is asking for and ultimately, if he is adamant that he wants £1500, it’s going to be cheaper to pay him but get it in writing and get the period extended to 24 weeks from the beginning so that he can’t come back to you in another six weeks with his hand out.
Can I clarify anything for you?
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