Cat run parts list

Version v1. 8 ft long x 4 ft deep, litter level at 24 in, lounge level at 54 in, roof 8.7 ft at the front and 9.7 ft at the house. Every quantity below comes from the 3D model.

Total $1,770.72

before sales tax (9.25% in Hamilton County: 7% state + 2.25% local). Prices read from the Home Depot North Chattanooga store page, Amazon and Tractor Supply on Nov 1, 2026.

Lumber $422.42

Qty	Item	Each	Total	What it is for
4	4x4 x 10 ft PT post, ground contact HD	$17.48	$69.92	4 corner posts
12	2x6 x 8 ft PT HD	$10.38	$124.56	floor rims + joists (both levels), roof beams, house-tie blocks
4	2x4 x 10 ft PT HD	$9.18	$36.72	roof purlins (98 in long) + knee braces
14	2x4 x 8 ft PT HD	$4.48	$62.72	rafters, studs, drawer dividers + jambs, slot header, shelf cleats, window collar
4	2x2 x 8 ft PT HD	$5.58	$22.32	2 access-door frames + window collar fillers
1	2x10 x 8 ft PT HD	$18.88	$18.88	3 cat shelves (2 stair shelves + lookout)
2	1x4 x 8 ft PT HD	$4.68	$9.36	drawer tray sides
1	1x8 x 8 ft PT HD	$8.28	$8.28	drawer back gates
27	1x2 x 8 ft PT (battens) HD	$2.58	$69.66	cover every mesh edge + stud line (190.4 ft + 10%)

Sheet goods $166.94

Qty	Item	Each	Total	What it is for
2	23/32 in 4x8 PT plywood HD	$59.08	$118.16	floor of each level (one full sheet each, notched at the posts)
1	15/32 in 4x8 PT plywood HD	$48.78	$48.78	3 drawer tray bottoms + 3 drawer fronts (one sheet)

Enclosure + roof $423.27

Qty	Item	Each	Total	What it is for
3	1/2 in 19-ga hardware cloth, 4 ft x 25 ft HD	$99.97	$299.91	195.5 sq ft of walls, ceiling and doors + 25% layout waste
2	Suntuf 26 in x 12 ft clear polycarbonate panel HD	$39.98	$79.96	cut each into 2 pieces of 53.7 in; 4 pieces cover the roof. Store shows limited stock, call first; fallback is 4 of the 8 ft panels at $28.98 (35 in stock)
2	Suntuf horizontal closure strips (6-pack) HD	$7.48	$14.96	seal the corrugations at the front and back purlins
2	Woodtite 2 in roofing screws w/ washer (50) HD	$6.98	$13.96	4 purlins x 4 pieces x 4 screws
1	Aluminum roll flashing HD	$14.48	$14.48	bent over the back purlin and tucked up under a siding course so wall water can't run behind the roof

Foundation + framing hardware $357.85

Qty	Item	Each	Total	What it is for
8	Quikrete 80 lb concrete HD	$6.47	$51.76	4 piers, 12 in round x 18 in deep, 2 bags each
4	5/8 x 10 in galvanized anchor bolt Lowe's	$3.98	$15.92	set wet in each pier for the post base
4	Simpson ABA44Z post base HD	$14.98	$59.92	holds each post 1 in off the concrete; ABU44Z ($33.54) if you want the heavier uplift-rated one
14	Simpson LUS26Z joist hanger (2x6) HD	$1.98	$27.72	both ends of every floor joist + the stair-hole header
40	Simpson A35Z framing angle HD	$1.64	$65.60	2 per end of every rim and roof beam where it meets a post
10	Simpson H2.5AZ hurricane tie HD	$0.98	$9.80	every rafter to both roof beams
5	1/2 x 8 in galvanized lag screw HD	$4.56	$22.80	ties the run to house wall studs (level 2 rim + roof beam). Online it's only sold as a 25-pack ($114, $4.56 each); look for singles in the fastener aisle
1	1/2 in galvanized washers (50) HD	$22.45	$22.45	for the lags (only ~5 needed; single washers are $0.49)
2	#9 x 3 in exterior deck screws, 5 lb HD	$29.97	$59.94	all framing
2	#8 x 1-5/8 in exterior screws, 1 lb HD	$10.97	$21.94	battens, plywood, drawer trays, slides

Litter drawers $139.65

Qty	Item	Each	Total	What it is for
3	28 in full-extension slides, 100 lb (pair) Amazon	$23.95	$71.85	one pair per drawer, side-mounted to the 2x4 dividers
4	Small Mixing Tub A-41, 28 x 20 x 6 in HD	$7.97	$31.88	3 in the drawers + 1 spare to swap in on wash day
3	Exterior drawer pull HD	$6.98	$20.94	one per drawer front
2	Pine pellet bedding, 40 lb Tractor Supply	$7.49	$14.98	first fill of all 3 pans + a refill

Doors, shelves, cat door $260.59

Qty	Item	Each	Total	What it is for
2	6 in galvanized T-hinge (2-pack) HD	$22.53	$45.06	2 hinges per access door
2	4-1/2 in galvanized safety hasp HD	$9.47	$18.94	one per door; clip a carabiner through it (raccoons open plain latches)
6	Simpson SBV galvanized shelf bracket, 9 x 11 in HD	$10.48	$62.88	2 per cat shelf (closest galvanized bracket in stock)
1	Ideal Pet aluminum sash window cat door (27-32 in window), Chubby Kat 7.5 x 10.5 flap Amazon	$114.99	$114.99	drops into the raised window like an AC unit, no cutting. 33-38 in windows: $107.02 (amazon.com/dp/B000TVSXI6)
2	Arrow T50 1/2 in galvanized staples (1,250) HD	$4.97	$9.94	mesh to framing before the battens go on
1	3/4 in hot-dip galvanized fence staples, 1 lb HD	$8.78	$8.78	extra hold on mesh at the corners and doors

Tools you may not have $0.00

Qty	Item	Each	Total	What it is for
1	Arrow T50 staple gun HD optional, not in total	$22.97	$22.97	skip if you own one

Cut list

Lengths in inches, packed onto the board sizes above with a 1/8 in saw kerf. Rafters and knee braces get angled ends; lengths shown are long point to long point.

4x4: 4 boards

Board	Cuts (longest first)	Left over
1. 10 ft	113.00 in Post, back-left	6.9 in
2. 10 ft	113.00 in Post, back-right	6.9 in
3. 10 ft	101.00 in Post, front-left	18.9 in
4. 10 ft	101.00 in Post, front-right	18.9 in

2x6: 12 boards

Board	Cuts (longest first)	Left over
1. 8 ft	89.00 in L1 front rim; 5.50 in House tie spacer 1, roof beam	1.2 in
2. 8 ft	89.00 in L1 back rim; 5.50 in House tie spacer 2, roof beam	1.2 in
3. 8 ft	89.00 in L2 front rim	6.9 in
4. 8 ft	89.00 in L2 back rim	6.9 in
5. 8 ft	89.00 in Front roof beam	6.9 in
6. 8 ft	89.00 in Back roof beam	6.9 in
7. 8 ft	45.00 in L1 joist 1; 45.00 in L1 joist 2; 5.50 in House tie spacer 1, level 2 rim	0.1 in
8. 8 ft	45.00 in L1 joist 3; 45.00 in L2 joist 1; 5.50 in House tie spacer 2, level 2 rim	0.1 in
9. 8 ft	45.00 in L2 joist 2; 45.00 in L2 joist 3; 5.50 in House tie spacer 3, level 2 rim	0.1 in
10. 8 ft	41.00 in L1 left rim; 41.00 in L1 right rim	13.8 in
11. 8 ft	41.00 in L2 left rim; 41.00 in L2 right rim	13.8 in
12. 8 ft	19.75 in L2 stair-hole header	76.1 in

2x4: 18 boards

Board	Cuts (longest first)	Left over
1. 10 ft	98.00 in Purlin 1; 17.64 in Knee brace, right end	4.1 in
2. 10 ft	98.00 in Purlin 2; 15.78 in Drawer slot header end block	6.0 in
3. 10 ft	98.00 in Purlin 3; 12.28 in Front stud L1-2; 8.00 in Drawer jamb 2	1.3 in
4. 10 ft	98.00 in Purlin 4	21.9 in
5. 8 ft	73.50 in Drawer slot header	22.4 in
6. 8 ft	61.19 in Window collar stud, left; 27.50 in Drawer divider 1	7.1 in
7. 8 ft	61.19 in Window collar stud, right; 27.50 in Drawer divider 2	7.1 in
8. 8 ft	61.19 in Back stud L2, right; 27.50 in Drawer divider 3	7.1 in
9. 8 ft	56.09 in Left end stud L2; 27.50 in Drawer divider 0 (left); 8.00 in Drawer jamb 3	4.0 in
10. 8 ft	56.09 in Right end stud L2; 23.78 in Back stud L1-1; 12.28 in Front stud L1-1	3.5 in
11. 8 ft	53.70 in Rafter 1; 41.00 in Shelf A cleat (right end)	1.0 in
12. 8 ft	53.70 in Rafter 2; 41.00 in Shelf B cleat (right end)	1.0 in
13. 8 ft	53.70 in Rafter 3; 23.78 in Back stud L1-2; 17.64 in Knee brace, front-left	0.5 in
14. 8 ft	53.70 in Rafter 4; 23.78 in Back stud L1-3; 17.64 in Knee brace, front-right	0.5 in
15. 8 ft	53.70 in Rafter 5; 23.78 in Left end stud L1; 17.64 in Knee brace, left end	0.5 in
16. 8 ft	44.50 in Front stud L2-1; 44.50 in Front stud L2-2	6.8 in
17. 8 ft	44.50 in Front stud L2-3; 43.00 in Window collar header; 8.00 in Drawer jamb 1	0.1 in
18. 8 ft	23.78 in Right end stud L1	72.1 in

1x4: 2 boards

Board	Cuts (longest first)	Left over
1. 8 ft	30.00 in Drawer 1 tray side, left; 30.00 in Drawer 1 tray side, right; 30.00 in Drawer 2 tray side, left	5.6 in
2. 8 ft	30.00 in Drawer 2 tray side, right; 30.00 in Drawer 3 tray side, left; 30.00 in Drawer 3 tray side, right	5.6 in

1x8: 1 boards

Board	Cuts (longest first)	Left over
1. 8 ft	21.00 in Drawer 1 back gate; 21.00 in Drawer 2 back gate; 21.00 in Drawer 3 back gate	32.6 in

2x2: 4 boards

Board	Cuts (longest first)	Left over
1. 8 ft	56.00 in Window collar filler, left; 23.58 in Level 1 front door stile, left; 12.30 in Level 1 front door rail, bottom	3.7 in
2. 8 ft	56.00 in Window collar filler, right; 23.58 in Level 1 front door stile, right; 12.30 in Level 1 front door rail, top	3.7 in
3. 8 ft	44.30 in Level 2 front door stile, left; 44.30 in Level 2 front door stile, right	7.2 in
4. 8 ft	43.00 in Window collar filler, top; 22.30 in Level 2 front door rail, bottom; 22.30 in Level 2 front door rail, top	8.0 in

2x10: 1 boards

Board	Cuts (longest first)	Left over
1. 8 ft	28.00 in Lookout shelf, level 2 front; 18.00 in Cat shelf A, low (right end); 15.50 in Cat shelf B, high, under the stair hole	34.1 in

Measure before buying

Window width, jamb to jamb (picks the cat door: 27-32 in or 33-38 in).
Outside sill height above the ground. The model assumes 56 in. The level-2 floor sits 2 in below the sill.
Window height, sill to head. The model assumes 48 in. The roof meets the wall above it.
Wall stud locations (find with a stud finder) where the 5 house ties land.
Siding type: vinyl, wood lap, brick or fiber cement. Brick means sleeve anchors instead of lags.