Is there a minimum house size in Royal Oak?

Yes, and it is parcel-specific. In One-Family Residential, the minimum floor area of a house is set by the smallest adjacent single-family dwelling, counting side and front neighbors and excluding the rear, and it never falls below 1,000 square feet (§ 770-23A).

So the minimum depends on what is built around you. The same house plan can be too small on one lot and acceptable on the next street.

The floors differ by district:

• One-Family Residential: never below 1,000 square feet (§ 770-23A).
• One-Family Large Lot: same adjacent-dwelling rule, never below 1,300 square feet (§ 770-35D).
• Two-Family Residential: each unit needs 80% of the one-family figure derived from adjacent homes, never below 800 square feet per unit (§ 770-23B).

Because the calculation turns on your specific neighbors, confirm the number with the planning division at 248-246-3280 before drawing plans.