Shed foundations by size

A shed pad is the footprint plus 1 ft on every side, 4 in of compacted crushed stone. An 8x10 needs 2.3 tons, a 10x12 needs 3.2 tons, and a 12x16 needs about 4.8 tons.

By the ShedSizer editors · Updated 2026-09-24 · Researched from manufacturer specifications, published code summaries and verified owner reviews

Shed	Pad	Gravel 4 in	4 in slab bags (80 lb)	16 in pavers	Anchors
3x6 shed	5 x 8	0.8 t	12	11	4
4x4 shed	6 x 6	0.7 t	10	10	4
4x6 shed	6 x 8	0.9 t	15	15	4
4x8 shed	6 x 10	1.1 t	20	19	4
4x10 shed	6 x 12	1.4 t	25	24	6
5x5 shed	7 x 7	0.9 t	16	15	4
5x6 shed	7 x 8	1.1 t	19	18	4
5x8 shed	7 x 10	1.3 t	25	24	4
6x6 shed	8 x 8	1.2 t	23	22	4
6x8 shed	8 x 10	1.5 t	30	29	4
6x10 shed	8 x 12	1.8 t	37	36	6
6x12 shed	8 x 14	2.1 t	45	43	6
7x7 shed	9 x 9	1.5 t	30	29	4
7x9 shed	9 x 11	1.9 t	39	38	6
7x10 shed	9 x 12	2.1 t	43	42	6
7x12 shed	9 x 14	2.4 t	52	50	6
7x14 shed	9 x 16	2.7 t	60	58	6
8x8 shed	10 x 10	1.9 t	40	38	4
8x10 shed	10 x 12	2.3 t	49	48	6
8x12 shed	10 x 14	2.7 t	59	57	6
8x14 shed	10 x 16	3.0 t	69	67	6
8x15 shed	10 x 17	3.2 t	74	71	6
8x16 shed	10 x 18	3.4 t	79	76	6
8x20 shed	10 x 22	4.2 t	98	95	8
10x10 shed	12 x 12	2.7 t	62	60	6
10x12 shed	12 x 14	3.2 t	74	71	6
10x14 shed	12 x 16	3.7 t	86	83	6
10x16 shed	12 x 18	4.1 t	98	95	6
10x18 shed	12 x 20	4.6 t	110	107	8
10x20 shed	12 x 22	5.0 t	123	119	8
12x12 shed	14 x 14	3.7 t	89	86	6
12x14 shed	14 x 16	4.3 t	103	100	6
12x16 shed	14 x 18	4.8 t	118	114	6
12x18 shed	14 x 20	5.3 t	132	128	8
12x20 shed	14 x 22	5.9 t	147	142	8
12x24 shed	14 x 26	6.9 t	177	171	8
14x14 shed	16 x 16	4.9 t	120	116	6
14x16 shed	16 x 18	5.5 t	137	133	6
14x20 shed	16 x 22	6.7 t	172	166	8
16x20 shed	18 x 22	7.5 t	196	189	8
5x10 shed	7 x 12	1.6 t	31	30	6
6x14 shed	8 x 16	2.4 t	52	50	6
7x11 shed	9 x 13	2.2 t	48	46	6
8x13 shed	10 x 15	2.9 t	64	62	6
8x18 shed	10 x 20	3.8 t	89	86	8
10x24 shed	12 x 26	5.9 t	147	142	8
12x17 shed	14 x 19	5.1 t	125	121	8
12x30 shed	14 x 32	8.5 t	220	213	10

Foundation kits and pad tools

LGJIAOJIAO 3ftx50ft Weed Barrier Landscape Fabric Heavy Duty LGJIAOJIAO $13.66 Check price on Amazon

BlumeTrec 10"x10" Steel Tamper with 48" Handle BlumeTrec $42.99 Check price on Amazon

Arrow FDN109 Storage Shed with Floor Base Kit for 8'x8' Arrow $119.55 Check price on Amazon

Generic Heavy Duty Shed Base Foundation Kit Generic $905.52 Check price on Amazon

Prices change often; the button shows today's price on Amazon.

This page is researched guidance, not professional engineering, legal or building-code advice. Sizes, loads and permit rules vary by product and by town: check your local code and the kit manufacturer's instructions before you build.