23 or 30 square metres. Or something else entirely maybe...

Yesterday MOH measured the patio and the space it will extend to. Twenty three square metres was the verdict. Today MOH re-measured and re-calculated the same space. Today the verdict is thirty square metres!

He's trying again - and it's still light enough to today - hooray! Apparently different methods were used, that's why there were different answers... My pointing out the space remained the same size was not apparently useful!