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Retaining wall at the front and rear of our house.

we need pricing for two retaining walls at our property. 1 - front of the house, use to be a car space but the old retaining wall is falling apart so thinking of doing a new wall around the original one and filling it in? would love advice for this as i havent had much to do with them previously. 2 - bottom of our garden is fairly sloped and we are wanting to level it out so would like to see ideas for that too.