Landlord does not report our ontime rent. Impact on our credit?

[Jane Guerreso]

We are renting a house from a private party. Landlord does not report our on time payments to build our credit. In couple years we are looking to purchase a house, would it be sufficient for our landlord to provide a letter to our future lender that we paid on time? We have really good credit right now and want to keep it that way. How and where does the landlord report our payments ?

Thank you