De-Converting From Duplex to SFH

[Nick Moore]

I currently invest in an area where there are a lot of SFH's and Duplex Conversions (SFH-->Duplex). Duplexes usually go for $100-$115 per sqft, while SFH can go for $140-170. Rent is good here, but surely people have thought to de-convert and flip, or at least refi and rent out as 3/2 or 4/2 SFH?

I'm not seeing this happen a lot, which makes me think the de-conversion process with HVAC and plumbing must be expensive? Anyone have experience with this?