This City required individual lot grading plans, signed & sealed by an engineer, for each building permit.

If you want to make it easier, look for one where it's all direct replacement meaning the water and gas and appliances are staying in the same place - less permits and less cost.

My concern is whether the city could deny permits for these modifications, such as removing walls or converting a garage, or if they are mainly just concerned with safety and habitability.

I invest in Philadelphia and nine years ago I was able to complete a two story 1200 SF rowhomes rehab for $50,000 with no shortcuts, fully permitted etc.

This would be a flat fee payment for the use of their license for permitting SFH.

It won't impact the rental side but will cause issues on the rehab progress and permit nonsense instructed by the city. 

Regulations include NIMBYism, slow permitting, over permitting, zoning that has not been brought to current demands, etc.

@Fahima Hilal an architect usually only outlines mechanicals, plumbing & electrical on their blueprints.Your contracts should be creating appropriate drawings showing where their stuff would go and submit to city with their permit application.

The Help Desk responds quickly when you message them.PS is for a particular type of investing, which are probably the PM, and I wonder if you are permitted to live there.

Hello @Roger Brittingham,Moving singlewides could be a great low-cost investment, but be mindful of these considerations:Moving & Setup Costs: Relocating singlewides can be expensive (transport, permits, setup, utilities).