Common Lot Sizes in Historic Districts

Many lot sizes in US neighborhoods built before World War 2 have common sizes. The standard lot measures 66 feet wide by 132 feet deep. This is .2 acres or 8712 square feet.

Lot sizes can often be broken down from a square mile.

1 Square Mile 640 Acres
1/4 Square Mile 160 Acres
1 acre Five 66ft x 132ft lots

While many lots have this dimension, this is not always the case. For example, my lot is 33 x 132ft, half the standard lot. This measures .1 acres or 4356 square feet. Downtown commercial lot sizes vary, but a 22 foot wide storefront is common. This creates an exciting environment when walking through a vibrant downtown.


Dimensions Table with Square Feet
33ft 66ft 132ft
33ft 1,089 ft2 (0.025 acres) 2,178 ft2 (0.05 acres) 4,356 ft2 (0.1 acres)
66ft 2,178 ft2 (0.05 acres) 4,356 ft2 (0.1 acres) 8,712 ft2 (0.2 acres)
99ft 3,267 ft2 (0.075 acres) 6,534 ft2 (0.15 acres) 13,068 ft2 (0.3 acres)
132ft 4,356 ft2 (0.1 acres) 8,712 ft2 (0.2 acres) 17,424 ft2 (0.4 acres)
165ft 5,445 ft2 (0.125 acres) 10,890 ft2 (0.25 acres) 21,780 ft2 (0.5 acres)
198ft 6,534 ft2 (0.15 acres) 13,068 ft2 (0.3 acres) 26,136 ft2 (0.6 acres)
231ft 7,623 ft2 (0.175 acres) 15,246 ft2 (0.35 acres) 30,492 ft2 (0.7 acres)
264ft 8,712 ft2 (0.2 acres) 17,424 ft2 (0.4 acres) 34,848 ft2 (0.8 acres)
297ft 9,801 ft2 (0.225 acres) 19,602 ft2 (0.45 acres) 39,204 ft2 (0.9 acres)
330ft 10,890 ft2 (0.25 acres) 21,780 ft2 (0.5 acres) 43,560 ft2 (1 acres)
363ft 11,979 ft2 (0.275 acres) 23,958 ft2 (0.55 acres) 47,916 ft2 (1.1 acres)
396ft 13,068 ft2 (0.3 acres) 26,136 ft2 (0.6 acres) 52,272 ft2 (1.2 acres)
429ft 14,157 ft2 (0.325 acres) 28,314 ft2 (0.65 acres) 56,628 ft2 (1.3 acres)
462ft 15,246 ft2 (0.35 acres) 30,492 ft2 (0.7 acres) 60,984 ft2 (1.4 acres)
495ft 16,335 ft2 (0.375 acres) 32,670 ft2 (0.75 acres) 65,340 ft2 (1.5 acres)
528ft 17,424 ft2 (0.4 acres) 34,848 ft2 (0.8 acres) 69,696 ft2 (1.6 acres)
561ft 18,513 ft2 (0.425 acres) 37,026 ft2 (0.85 acres) 74,052 ft2 (1.7 acres)
594ft 19,602 ft2 (0.45 acres) 39,204 ft2 (0.9 acres) 78,408 ft2 (1.8 acres)
627ft 20,691 ft2 (0.475 acres) 41,382 ft2 (0.95 acres) 82,764 ft2 (1.9 acres)
660ft 21,780 ft2 (0.5 acres) 43,560 ft2 (1 acres) 87,120 ft2 (2 acres)
528ft 2640ft 5280ft
528ft 6.4 acres (0.01 sq miles) 32 acres (0.05 sq miles) 64 acres (0.1 sq miles)
792ft 9.6 acres (0.015 sq miles) 48 acres (0.075 sq miles) 96 acres (0.15 sq miles)
1056ft 12.8 acres (0.02 sq miles) 64 acres (0.1 sq miles) 128 acres (0.2 sq miles)
1320ft 16 acres (0.025 sq miles) 80 acres (0.125 sq miles) 160 acres (0.25 sq miles)
1584ft 19.2 acres (0.03 sq miles) 96 acres (0.15 sq miles) 192 acres (0.3 sq miles)
1848ft 22.4 acres (0.035 sq miles) 112 acres (0.175 sq miles) 224 acres (0.35 sq miles)
2112ft 25.6 acres (0.04 sq miles) 128 acres (0.2 sq miles) 256 acres (0.4 sq miles)
2376ft 28.8 acres (0.045 sq miles) 144 acres (0.225 sq miles) 288 acres (0.45 sq miles)
2640ft 32 acres (0.05 sq miles) 160 acres (0.25 sq miles) 320 acres (0.5 sq miles)
2904ft 35.2 acres (0.055 sq miles) 176 acres (0.275 sq miles) 352 acres (0.55 sq miles)
3168ft 38.4 acres (0.06 sq miles) 192 acres (0.3 sq miles) 384 acres (0.6 sq miles)
3432ft 41.6 acres (0.065 sq miles) 208 acres (0.325 sq miles) 416 acres (0.65 sq miles)
3696ft 44.8 acres (0.07 sq miles) 224 acres (0.35 sq miles) 448 acres (0.7 sq miles)
3960ft 48 acres (0.075 sq miles) 240 acres (0.375 sq miles) 480 acres (0.75 sq miles)
4224ft 51.2 acres (0.08 sq miles) 256 acres (0.4 sq miles) 512 acres (0.8 sq miles)
4488ft 54.4 acres (0.085 sq miles) 272 acres (0.425 sq miles) 544 acres (0.85 sq miles)
4752ft 57.6 acres (0.09 sq miles) 288 acres (0.45 sq miles) 576 acres (0.9 sq miles)
5016ft 60.8 acres (0.095 sq miles) 304 acres (0.475 sq miles) 608 acres (0.95 sq miles)
5280ft 64 acres (0.1 sq miles) 320 acres (0.5 sq miles) 640 acres (1 sq miles)
Square feet Dimensions
50 7.1 ft x 7.1 ft
100 10.0 ft x 10.0 ft
150 12.2 ft x 12.2 ft
200 14.1 ft x 14.1 ft
250 15.8 ft x 15.8 ft
300 17.3 ft x 17.3 ft
350 18.7 ft x 18.7 ft
400 20.0 ft x 20.0 ft
450 21.2 ft x 21.2 ft
500 22.4 ft x 22.4 ft
550 23.5 ft x 23.5 ft
600 24.5 ft x 24.5 ft
650 25.5 ft x 25.5 ft
700 26.5 ft x 26.5 ft
750 27.4 ft x 27.4 ft
800 28.3 ft x 28.3 ft
850 29.2 ft x 29.2 ft
900 30.0 ft x 30.0 ft
950 30.8 ft x 30.8 ft
1,000 31.6 ft x 31.6 ft
Square feet Dimensions
1,050 32.4 ft x 32.4 ft
1,100 33.2 ft x 33.2 ft
1,150 33.9 ft x 33.9 ft
1,200 34.6 ft x 34.6 ft
1,250 35.4 ft x 35.4 ft
1,300 36.1 ft x 36.1 ft
1,350 36.7 ft x 36.7 ft
1,400 37.4 ft x 37.4 ft
1,450 38.1 ft x 38.1 ft
1,500 38.7 ft x 38.7 ft
1,550 39.4 ft x 39.4 ft
1,600 40.0 ft x 40.0 ft
1,650 40.6 ft x 40.6 ft
1,700 41.2 ft x 41.2 ft
1,750 41.8 ft x 41.8 ft
1,800 42.4 ft x 42.4 ft
1,850 43.0 ft x 43.0 ft
1,900 43.6 ft x 43.6 ft
1,950 44.2 ft x 44.2 ft
2,000 44.7 ft x 44.7 ft
Are you in the historic district?
Detailed property records can be found here
Use Map Washtenaw for maps of historical aerial photos, flood zones, and more.
Browse the map below (click for full size):
For a detailed description of all regulations, go here and click on the "Historic District Design Guidelines" pdf.

If you're doing a larger renovation, I recommend working with an architect with Ann Arbor historic experience. Jill Thatcher is the point person in the Ann Arbor government for historic district questions. Contact her before buying your home or starting a renovation project.
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