Then there will be the energy calcs, etc. required for adding any new windows, etc.

I am looking for a ballpark estimate on how significant new vinyl windows will affect the value of the home?  

Depending on who you find for the window replacement I would generally figure at least 2k minimum to have a window that is to code.  

We have put in high efficiency windows, replaced the A/C unit last summer, upgraded the flooring and installed an extended patio.  

so, we did the showing last night. 2 couples were early, and 3 right on starting time, with one more showing up 1/2 hour into the 1&1/2 hour window we allotted.

If the window is close, you might want to do is listed with a discount brokerage and offer it at 149K. 

This strategy works great for gentrifying areas where a slew of high-income people are suddenly finding the area "hip" and willing to pay top dollar even though the schools aren't necessarily nice and there are still bars on windows (East Hollywood, Echo Park, Highland Park for instance).

It will probably still be standing 100 years after the wood/frame/stucco Styrofoam window frames homes being built in Hesperia/ Riverside/ Victorville by Pulte Homes have all been bulldozed down. 

That tenant has been there a yr, has trashed it a bit just being sloppy, she is moving out when I take ownership.There are some windows at minimum that need replaced on both sides, small roof repair.

Look below this Window, and you will see a list of names of people that have posted in this thread.