Professional fees - retrospective planning approval

Hi, We recently sold a flat. In order to sell it we had normalize planning consents (we applied for permission to retain works in a grade 2 listed building, and our application was successful). In formulating our application we incurred architects fees, legal fees, and planning fees. Are these professional fees claimable against capital gains tax? I'm unsure whether normalizing planning consents counts as an improvement to the property. One could argue that it improves the property by making it saleable, and placing it on a firm legal footing. Kind regards

Hi,
Please have a look at the guidance at Capital Gains Manual CG15250 - Expenditure: incidental costs of acquisition and disposal, which provides the limited list of incidental costs of acquisition and disposal.
Thank you.