Costs are general estimated on multiple factors. Eg. dimensions of the wall area, access for machines & materials, differences in freight distance, pre & post excavations, tipping & how much labour is needed for the build. Every job has its own unique elements, this is why a site visit is necessary before an accurate quote can be given.

A well built sandstone boulder retaining wall with a good setback, correct amount of gravel, geo fabric & ag pipe has an enormous amount of strength, it can greatly improve the drainage on your property by directing water away from structures towards lower-lying areas. This can help deter soil erosion, flooding & damage that can come with it.