If your goal is to maximize rental income, adding a bedroom or bathroom often achieves that.

It really depends on your goals and what you're looking to achieve.

From there, work backwards into your purchase price to achieve that return.  

Tschida Congrats on your considerable achievements.

Yes sure, but there are great builders and it is irresponsible to make such a statement.The modular duplexes I am going with provide higher quality insulation and finishes and structure than you find in local stick builds.There have been studies showing modulars are sturdier than stick builds, and you can certainly achieve price efficiencies for the reasons stated above.For an investor with a volume goal (such as my 100 units in 3 years goal) in an area with low or expensive inventory or high competition, or for investors in an area with a lot of ongoing construction leading to high labor costs, or somebody that wants to run a strategy that churns money fast then modulars are a great development platform.

It is a process but is achievable if the SFH is in the right area and meets the counties criteria. 

Figure out your investment style first and then you can ask more specific questions on different ways to achieve that goal.

To achieve consistency of a product and business model over and over and perform at a high level you need systems and processes in place.

Spend some time to  gain clarity about what you hope to achieve and what the path to achieve it;  that will make the myraid of decisions easier.   

Never used that rules nor any rules set by the gurus and somehow build up a portfolio that allowed my to exit the corporate world.I find those rules are an obstacles for my clients and slow them down from achieving their dreams.Its better to come up with your own rules based on your personal goals & strategy.