Lowering ground level

I am in the process of buying a house (built around 1990). I had a level 2 survey and surveyor has said that he "cannot confirm whether a damp-proof course is present because of the mortar pointing obscuring the construction. The ground levels to the rear of the property are high and risk bridging any damp proof course that exists. There were no signs of damp within the property suggesting any issues. However, it may be prudent to reduce the external ground levels to the rear or insert a gully where the external wall meets the ground. The recommended height for the external ground level beneath the damp proof course is 150 mm".
I have noticed myself that the bottom of back door is actually level with the patio and so there is no threshold as such.
I have no idea if this is a big and/or expensive job. I wondered whether anyone had any advice roughly how much this would cost (e.g., would it be in the 100's or 1000's)?

Asked by Jody on 7th Apr 2023
Expert Trade Answers
"No enough info but on average it should be about £70 a metre for a medium wall. To put damp course in . So if putting a gutter in you would be over £100 metre . Not sure if than answers your question !"
Answered on 7th Apr 2023 - Member since Feb 2023 - report
"There seems to be alot going on there best have a survey done easy way to check from floor level want to be 150mm down. If above should have a membrane ie, black jack or similar .Or french drain. But my advice get a expert like myself. Sean."
Answered on 7th Apr 2023 - Member since Jul 2020 - report
"I could come and have a look for you and go from there sounds like your ground is just bit to high you could to with dropping the ground level and to install an acco drain which should prevent any damp issues"
Answered on 12th Apr 2023 - Member since Apr 2023 - report
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