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Storage space under the stairs

I have bought a townhouse that has a storage space under the stairs, that is currently accessed by a door that is approx 1mx1m. I'm wanting quotes to enlarge that door for easier access, and then to put some shelves up in that space so that it can be used as a linen cupboard. I know the door will end up being an odd shape due to the size of the cavity, but at the moment it's wasted space. Thanks