If you're wondering what configurations for kitchens will work, or need to figure out how to lay out rooms, etc. there's a FREE software program you can download by Auto CAD.

Its part of mobile me, but is free if you're not signed up for mobile me.You do have to configure the phone into the service before you lose it.

I point out the water saving toilets, efficient radiators and row house configuration, the energy efficient windows and light bulbs.

Once it is configured, you can process repeatable processes monthly, quarterly and annually.

One may consider that code in an area may require a permit for something as simple as changing out a toilet, yet a rehabber can't possibly turn a profit if they pulled a permit for every single little item needed.With regard to adding square footage, changing configurations, etc, I would always recommend it be done with full permits, but on other items, I would not make the same recommendation even though it may be code.

A 3 unit with a home in the rear just sold @ tax lien auction for $45k. but we passed because of the high tax assessment & rehab $$$.However, we own several such configurations & one we bought (divorce) was not even listed as 2 homes & there is enough back yard & separate back-lane entrance to add yet another home.But what we are seeing is older homes having their garages blown out into in-law suites with the upper being attached to the upstairs as a master with an ensuite.

Lastly, What is the existing configuration of the house and what is the existing footprint and lot size?

I asked one of the engineers if a straigt configuration is so much more efficient than a V why do we not use them in all cars?

I was the highest bidder at $30K and I had brought the right configuration of cashier's checks to close just after the auction. 

I remember I used to see this configuration, including the shower, in old houses in Columbus, Ohio.