I need to resurrect this thread... I just did the calculations on my reclaimed and recycled coop. It is anything but cheap. In fact my recycled coop is proving to be rather expensive:
bookcase 1 free $0.00 coop
coop framing (treated wood) 1 free $0.00 coop
garage doors 4 free $0.00 coop
legs (maple) 8 free $0.00 coop
plywood 1 free $0.00 coop
3" paintbrush 1 1.14 $1.14 coop
3/4" staples 1 2.98 $2.98 coop
3" paintbrush 1 3.97 $3.97 coop
2 deckmate screw 1 6.93 $6.93 coop
cedar fence boards 3 2.35 $7.05 coop
construction adhesive 2 4.57 $9.14 coop
1 5/8 deckmate screw 2 6.93 $13.86 coop
2" corner brace (four pack) 5 2.87 $14.35 coop framing in el and sunroom
1 qt exterior paint 1 17.98 $17.98 coop
5/16 x 3 lag screws 1 19.2 $19.20 coop
caulk (DAP 3.0) 3 7.48 $22.44 coop
2x4x10 treated wood, cedar-look 4 5.67 $22.68 coop framing in el
3 deckmate screw 4 6.93 $27.72 coop
1 1/8 x 1 1/8 pine edging 24.58 1.53 $37.61 coop
1 gal exterior paint 1 39.98 $39.98 coop
2x2x8 treated wood, cedar-look 12 3.77 $45.24 coop
15/32 x 4 x 8 treated plywood 2 27.97 $55.94 coop floor, roof, etc
2x2x8 treated wood 24 3.57 $85.68 coop framing
underground electrical wire 0.5 coop
box to house GFCI 1 coop
GFCI 1 coop
cover for box to house GFCI 1 coop
red lamp 1 coop
red lamp receptacle 1 coop
timer for red lamp 1 coop
bails of hay 4 free $0.00 enclosure
bi-fold doors (white, metal) 2 free $0.00 enclosure
posts (maple) 4 free $0.00 enclosure
rigid tie connector 4 0.88 $3.52 enclosure door framing
2x4x8 treated wood, cedar-look 2 3.87 $7.74 enclosure door frame
chicken wire 1 22.69 $22.69 enclosure
cedar fence boards 20 1.2 $24.00 enclosure
cedar fence boards 20 1.2 $24.00 enclosure
concrete deck blocks 4 6.4 $25.60 enclosure
shutters, burgandy 6 5 $30.00 enclosure
2x4x10 treated wood, cedar-look 7 4.57 $31.99 enclosure door framing
As you noted, the most expensive items are shingles and hardware cloth. I put them on the "returns" list (not listed here). I should be able to find the 25' length of hardware cloth (instead of the 50' length I bought... I still have some on hand from building the rabbit cages). Also, I hope to find shingles that someone bought too many of (at a reduced cost to me).
I agree with the comment "we plan on having chickens forever", and I know that I enjoy keeping rabbits, so why not the chickens as well! I go through a minimum of eight store-bought eggs per week so I know that the four or five hens that we're hoping to get in August will produce that amount soon. I am a crafter as well, and yes, we tend to spend way too much on yarn and fiber for spinning. I've sold items at a few craft shows, and few people really appreciates the amount of time and investment spent on what I'm selling. Nonetheless, I get the sense of satisfaction knowing that I've done it myself.
Those were the costs, now here are the benefits (the "justification" of the OP's thread title):
I tend to invest heavily in my hobbies and projects, especially during the winter as it offsets the cost of anti-depression medications! And although my early-forty-something body is frequently feeling achy, the exercise of building the coop, hauling feed year round, hauling water in the winter are the most important benefits of all. Farm work keeps my joints moving and my muscles strong. In fact, a friend about my age came over the other day to buy rabbit manure, and she could barely lift the 35# bag. Despite my aches and pains, I felt quite proud of my abilities to lift the bags without much huffing and puffing and hope that continues for many years to come! : )