Can I get insurance to cover me against claims from neighbours

Can I get insurance to cover me against claims from neighbours if building my extension damages their property
I am planning a large single storey L shaped extension for my house. The walls go right to the perimiter and there is only about 1 metre between my neighbours house walls and the walls of my proposed extension. I have rang my home insurer, who gave me the run around for 30 minutes before I finally conceded defeat. They said that the builders insurer would cover damage and that if they would not the neighbours insurer would, but I am aware that as the homeowner I am personally liable for any damages that occur.

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