Also figure out the price for material, delivery and hauling away the old shingles as once the owner knows that, he may realize he's not saving that much...plus he has to factor in his flight, hotel and food to get to the US and time off his current job.

That means you should not be working on the property personally or turning yourself into a delivery person making daily trips to the hardware store.But, while flipping houses can be done within the IRS rules... there is a potential catch.   

They offer delivery service as well.

Hiring a project manager even for something small like an appliance delivery.

Otherwise they have to spend thousands to get these and also pay for the delivery. 

@Eva Chen  my appliance company stored the appliances for us and I have had furniture companies wait on delivery.

If Tenant sends rent via an online, bill-pay or other type of payment service system that uses a USPS mailing permit that does not result in a USPS postmark on the mailed envelope received by Agent, then it will be Tenant sole responsibility, regarding any late rent dispute with the Agent, to provide written proof of delivery date to the USPS, acceptable to Agent, from the payment service used to send the rent in question.LATE FEE: Agent offers Tenant the privilege of a Grace Period, with their rent being due by the FIFTH of each month.

USPS tracking doesn't list the delivery address online, but says it was delivered and lists the correct town and zip code. 

The initial capitalization was funded with $30.500 million of senior financing, $4.7 million of PE equity, and $1.3 million of equity capital from BV investors.The development and delivery of all 330 units was completed on time and on budget.

I've managed rentals that require water delivery, and it's not fun or cheap.