Doors can be sealed using ordinary household weatherstipping.  The
greatest challenge will be along the bottom.  Look for a rubber or felt
strip that that be applied along the bottom and that drags on the floor
to provide a light seal.  If the opening at the bottom of the closed door
is too large, you can purchase (or fabricate) a thin wood threshold to
fit under the door.

Windows are a bit more complicated.  If you are looking for a permanent
or semi-permanent solution, a sheet of plywood attached to the molding
using screws is pretty effective.  For a temporary solution, look for
blackout drapes.  These are made of heavy, lined black fabric.  You will
need to find some means to seal around the edges, and this may take some
creativity.

heavy, and you want to avoid shipping if possible.  Check with any photo
clubs in the area, and also with professional labs.  Many people are
giving up conventional darkroom work in favor of digital, and there are
lots of enlargers coming on the market.  

A relatively good 4x5 enlarger (Omega, Beselar, etc) will run US$200-500.  
Smaller enlargers (35mm and roll film) will be less.  

Lots of ways,.....weather stripping for the door and or a hanging black
curtain in front on the door.

Velcro lined black fabric or tape on blackout materials for the windows.

Ebay. The price depends on the need you have. If just for 35mm maybe a
few hundred probably no more than three "used" for a clean perfect
working order enlarger with a lens and negative carrier.

Lots of ways to darken rooms, and one of the Westons (Brett?) lived in
Hawaii and printed only at night so he could leave his darkroom open to the
ocean breezes (must be rough!).

Enlargers? I've had people GIVE me enlargers (2-Elwoods) when I expressed an
interest, bought one locally at a flea market for $20 last year (a nice
clean B-600 Omega, kept the borderless easel and gave the enlarger to a
friend) bought a D-3 Omega with lenses (rough) for $100 and see them go for
less than that all the time at Camera shows and swap meets.  Don't know
where you are but check the back of Shutterbug and find a show near you (one
coming up in March in Omaha, NE--near me).

Dealers at shows are dumping enlargers in favor of smaller items that are
easier to transport from show to show so hang in there.  I've found
enlargers in the trash at newspapers and schools, too, since they have gone
100% digital (I love digital, it's really driven down the price of my
favorite toys!).

Last year I was also given a Polaroid MP-3, MP-4, Besseler 16 roller
transport, Kodak Royal print processor, Imagemaker film processor and a big
Ilford RC dryer plus a ton of miscellaneous stuff.  Oh and a Minolta Dimage
35mm film scanner, the guy scanned all his negs and now shoots only digital
and used digital is too cheap to bother with so he gave me his scanner, too.

I think you'd be better off, all around, by using a
kitchen or bathroom space.

I took one sink of a two sink counter out and
use the space for an enlarger. The washer and
dryer came out and now I've a five foot width for
processing, compounding, etc.

Process single tray, one-shot or reuse, and you'll
have plenty of room in a small space.           Dan

    Tape aluminum foil over the windows.

    $50 ~ $150 on Ebay for a basic enlarger and lens.

Regards,

  John S. Douglas, Photographer -  http://www.puresilver.org
             Please remove the "_" when replying via email

Rather than turn your bedroom upside down, you may want to consider
turning a closet into a permanent home for your enlarger. This (so
called)closet can even be a corner of your bedroom draped with foam
backed drapes.  Then get yourself a Jobo and developpe everything with
the lights on in your kitchen. After your session is over, drain and
store your Jobo on the floor of the closet.

I did this for years when I lived in an apartment.

Regards.

Bob McCarthy
theyankeesnapper@aol.com

A couple of thoughts about other posts to this thread.

(1) don't bother with dark paint.  I would keep the area immediately around
the enlarger dark colored and non-reflective.  This could be as temporary as
some sheets of cardboard with black felt glued on.  I would avoid highly
reflective (foil based) wallpapers, but color isn't important to darkness.
My darkroom is painted a pleasing medium gray (18%?).  I used to print in an
interior bathroom which was white.  No problems.

(2) I second the post to consider an enlarger that can handle medium format.
I updated my very old Omega B-22 with a cold light head.  It can handle 2
1/4 x 2 1/4 as well as 35mm.  I also modified a 35mm negative carrier to
Horizon 202 panoramic proportions (24 x 54mm).  However, you might want to
consider a color head - even if you are doing only B&W, a color head may be
used to dial in the correct color filtration for variable contrast B&W
papers instead of using variable contrast filters under the lens like I do
with my Omega B-22.  More convenient and (I'm sure) better optically.  You
can find lots of used enlargers on e-bay, but study the literature
(websites) and pick a make and model that will do the job for you before
shopping.

(3) check with the paper manufacturer (try their website) for the proper
designation of safelight to use with their material.  I use 3 lights along
my workbench mounted at ceiling height (about 4 ft from the work
surface/trays).  They give me plenty of light and no fogging.

(4)  There are good books on darkroom design, even temprary darkroom
solutions.  Try the local library for answers.