You may want to:
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build your own house;
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build your own commercial building, shop, or office;
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carry out internal and external alterations, extend your building, or replace or add new window frames;
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convert (or change the use of) a building or part of a building;
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alter, replace or install a controlled service or fitting;
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create (or alter) a dwelling or flat in an existing building.
But, in order to do any of the above you may need approval under the building regulations.