To save yourself some stress, it may be easier to get the agent arrange for the vendor to get the plans, and you reimburse costs.
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I find it stupid that part of selling a house, all manuals, plans, permits etc are not handed over. Bloody silly really.
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If I were selling my house (as did happen when I did sell my house), the purchaser got all plans, manuals etc. No use to me anymore...
CHeerio
Simon.