yes, by eating it
This is way too complicated for the average homeowner to do. I srongly suggest calling a plumber.
The time it takes to assemble and install a new toilet is about one hour.
The downstairs toilet is not properly vented and the flow from the one upstairs creates a vacuum in the waste line.
Your landlord has the responsibility to provide you with habitable premises. If there is another usable sink in the house, it might not be required for the landlord to install a sink downstairs. Also, it is required if the landlord promised or implied that there would be a sink in that bathroom.
Every toilet needs to be vented.
Answer The waste line from the downstairs toilet is not vented (or not vented properly, or the vent is plugged up). Flushing the upstairs toilet creates a vacuum in the main line which sucks the water out of the one downstairs. Answer your waste lines for both toilets may be on the same branch off the sewer main. Either you have a stoppage in the branch line or you have a stoppage in the main line. (If it's the main line your downstairs toilet would have to be the lowest fixture, ie If you have a floor drain downstairs and it's a stoppage in your main line it would backup through the floor drain. If there is no floor drain the toilet downstairs is probably your lowest fixture.) Your best bet is to snake out the system through the toilet downstairs.
yes they are
You need to hire a plumber to properly install a new toilet. There are many issues that may arise if you try to install it yourself. Make sure you know the requirements such as shutting off the water before doing it.
Because they are, in effect, connected
Yes, as long as you seal the drain of the toilet you are removing.
If your plumbing system is properly installed there should not be any problem. If it isn't installed properly, you would already have water from sinks and bathtubs backing up out of the downstairs toilet.
plugged vent or stopped up system
Because your drain is blocked.
$7,460 plus filing fee's and restorations
To be frank,it's so hard for yourself to install such a big thing,why don't you enjoy the service of installing the seller provides?
You can install the vanity first. Then, install the tile up to the vanity and around the pipe for the toilet. Then, install the toilet. That way, you do not have to replace the tile should you ever have to replace the toilet.
Yes you can. I use to have this in my old house its perfectly fine. Although if someone goes to use the tap it slows the hose pressure down abit.
Yes, you would indeed need a permit to install another toilet. They are easy to get.
The plumber in your area did not install a "suds pressure zone" after a lot of usage the sudsing will go away
The main line going out is plugged or possibly collapsed. It is easier for the upstairs water to come out the downstairs than to go out the drain.
partially clogged drain or vent, improperly installed vent or drain
When you purchase a new toilet seat, it is going to come with the instruction manual as to how to install the seat, when you get it in your home for installation.
there are several flexy toilet conectors available to buy so a toilet can be fitted in any position provided there is room for it