Depending on installation costs in your area a low end carpet will cost between $1.90 - $2.50 per s/f.

Your guess of 300 s/f.....is the carpet going in just one room or maybe 2 bedrooms?

300 s/f is approximately 33 s/y. One s/y = nine s/f.

I believe it was 1999 when the federal government decided that carpet should be sould by s/f. The idea was that it would be easier for the consumer to compare different product types if they were all priced the same way. I'm really not sure why the government cares about how flooring is priced, but it does.

These days, carpet prices per foot range from about $2-$6 installed w/pad.

Has it been that long ago? Wow.

Yeah, I got my math backwards.

The front door is a project that I have been putting off for a while now. I know that once I get into it I will have an 'Oh crap' project too.

The scariest part of the front door project for me was.....Once you've torn it out, removed the frame....there is no turning back. There is no walking away from it for a day or two.
You get it fixed or your home is exposed to the elements and sticky fingers of thieves....not to mention the critters of the night.

Living room and a hallway.

1. Make sure what you are securing your frame to is secure to the structure. Since you're losing 4" in height, I'd suggest lagging a 4x4 [actually about 3 3/4 x 3 3/4, giving you room for shims] into the full width of the transom. Make sure that, if there are dimensional differences in the width as well, that the difference is filled with solid stock. Within a 1/4" of dimensionality.
2. True in all planes, horizontally, vertically, and front to back. Secure your shims tentatively [ie, 1/2 driven nails] to secure true, then check the door for free motion.
3. Don't lock everything down until you have true in all planes and free motion, then secure to the structure with 3 nails across the top, and 5 down each side, all appropriately shimmed of course.

Wood is not a good insulator. Your door header is already providing sufficient support for the 80" door. I would scab ONE 2X4 in at 81" and fill the space with insulation. That will give you a more energy efficient installation.

Exactly! I think that aspect makes me the most nervous. I am really bad about making my other projects last longer than they should. :)

Potayto, potahto. I prefer the brick shithouse approach to the energy efficient approach.

Ok, then your estimate is probably about right. I only asked because most folks are way bad about guesstimating square footage.

If you're just looking for cheap "realtor beige" carpet you can probably get the job done for about $700 +/-.

Not too bad, I suppose.

We just tore out the old kitchen floor.

THREE layers of vinyl flooring. One for each decade the house has been around.

If you were putting down a laminate, why didn't you just drop it on top of the vinyl.

LMAO I suppose one of us should've mentioned that.

It was damaged, and alot of the corners and sides were peeling up. I thought about trimming it out but then I think they would be uneven.

Anyways, it wasn't a big deal to tear it all out, about 30 min of work.