As mentioned, there are 2 major approaches: contractor or DIY to resolve.Contractor: Get bids and charge the tenant what it costs you.DIY: Tally your materials and labor cost, then charge your tenant.

Thanks Jasper for the information, yes, I'm interested in meeting Canadians here, whether they're investing in the US or in Canada, a lot of common interests on many fronts, taxes, that you mentioned is a big one of course.

As others have mentioned, you can pay that line of credit down/off when needed too. 

:@Alex Capozzolo@Troy Sheets does new construction I know others but they’re not on this siteThanks for the mention Mayer! 

For the reason you mention that is why I asked. 

Boots on the ground exposure, as David Krulac mentioned. 2.

As Don mentioned you might have several REI strategies. 

The other counties mention above have there same issues too, but as whole you can find great and safe investsments anywhere if you do your own due diligence.  

Contractors often run over time, and having a contingency plan in place both financially and logistically, could help you avoid a major dip in profits.Second, screening contractors more rigorously or, as you mentioned, running as owner/builder to control subs directly can help you keep costs and timelines in check.

The previous tenants have lived there for 16 years and have never mentioned mold related issues.