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It’s a small wall, probably 1m high by maybe 2.5m - 3m wide, think it’s single brick. Not of the same brick as the house.
Ideally I’d get ride of the small patch of gravel between that and the house and tile that too, the gravel area is about the width of two wheelie bins.
GoatandTricycle-
It’ll need to be double wythe with some ties between the two faces to give it any sort of strength, even then, your brickie might want to put a pier at each end. That shouldn’t be more than two/three days labour unless he/she has to dig out proper footings.
I’d go for reclaimed brick personally because new brick looks too new for pretty much everything. You’ll need ~120 bricks per sq m of wall so 360 for a 3m x 1m wall (double wythe). Plus a header course across the top, plus at least two courses under the finished ground level.
You should get it done for under £1,500.
The hard standing is the easy bit. You need a solid base of MOT tamped down to 100mm thick and then lay whatever you want on the top onto 4:1 sand cement. Indian stone flags are nice and not expensive.
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Without stating the obvious, it depends on size. What’s there now?
Might you get away with repointing it or rendering it?