The property is fenced only on the sides where the neighbors have erected them.  

Their homes are built inside and are modular (which means they are built in pods offsite and then shipped to the site and erected onsite.) 

In essence, is their any possibility the fence could be erected by the neighbour (or a previous owner)?

There are numerous federal, state, and local laws the govern where billboards can be placed as well as the types of structures that can be erected.

If you plan to extend the existing roofline, you will need to erect {probably only one} additional rafter and strip back some of the shingles and sheathing to properly tie your extension into the existing roof.This could be quite a pricey bathroom.

 $5 per square foot is a pretty good number if you are just talking about the labor for erecting a kit building like those you get from Trachte.  

If you have a good base (thick gravel lot) to build on, the slab and building can be bought and erected for $18-20 per square foot.  

To collect 2m php from investors to purchase the 128sqm lot and erect 10 door studio type rooms.3.

Borrower acknowledges having received a copy of the Fictitious Deed of Trust and agrees to be bound by the Sections and paragraphs of the Fictitious Deed of Trust incorporated into this Security Instrument.INCORPORATION OF FICTITIOUS DEED OF TRUST PROVISIONSTHIS SECURITY INSTRUMENT combines uniform covenants for national use and non-uniform covenants with limited variations by jurisdiction to constitute a uniform security instrument covering real property.BORROWER COVENANTS that Borrower is lawfully seised of the estate hereby conveyed and has the right to grant and convey the Property and that the Property is unencumbered, except for encumbrances of record.Borrower warrants and will defend generally the title to the Property against all claims and demands, subject to any encumbrances of record.TOGETHER WITH all the improvements now or hereafter erected on the property, and all easements, appurtenances, and fixtures now or hereafter a part of the property.All replacements and additions shall also be covered by this Security Instrument.All of the foregoing is referred to in this Security Instrument as the “Property.”

They’ve repainted all the blonde wood kitchen cabinets with Cherry wood stain (not well done), they’ve opened a bathroom wall party and inset shelving 3ft by 8 ft, they erected a large canopy in the back yard and built an attached tool shed (both not permitted) and so many other similar things.They had never asked permission of me to perform any of these changes and I am wondering how I go about collecting on repairs that will far exceed their original security deposit.