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Hm, are there limits?
No because our was for a glass box that must have been about one metre square!
Should we have done it for the tiny porch we added?
I don't know mainly because IANAL. When we sold we needed a deed of variation of a lease plan, so that wouldn't be needed for a freehold house. This Land Registry response suggests you don't need to do it at all for a freehold house, but again IANAL...
https://customerhelp.landregistry.gov.uk/forums/general-info-and-guidance/3a4aedf7-906a-ed11-a81b-6045bdcf8811?page=1Yet another reason I would never own anything but a simple freehold place ever again!
Hm, are there limits? Should we have done it for the tiny porch we added?