How big can a Broomfield ADU be?
✓ Verified against code · August 20, 2026
Up to 500 sq ft as of right, whatever the size of your house. Above 500 sq ft the cap becomes the lesser of half your home's first-floor footprint or 800 sq ft. Garage and porch area is excluded from both calculations, so the usable living space is often larger than the raw figure suggests.
Citation: BMC §17-32-160(D)
How current is this?
Broomfield’s ADU rules run under BMC §17-32-160 (Accessory Dwelling Units) (Ordinance 2265). Broomfield is a consolidated city and county. Ordinance 2265, adopted September 9, 2025 and effective a week later, aligned its code with HB24-1152 and went further than the statute requires on owner-occupancy: the repeal of any residency requirement was in the ordinance from first reading and survived to adoption. Its parking test, though, is built differently from the statute's. We verified this answer against primary sources on August 20, 2026, and every change we catch is logged in the changelog.
More Broomfield ADU questions
- Do I have to live on the property in Broomfield?
- Do I need parking for a Broomfield ADU?
- Does a Broomfield ADU need its own water tap?
- Can I Airbnb my Broomfield ADU?
All Broomfield ADU rules → · Compare Colorado cities →
Not legal advice — lot-specific overlays can change the answer for your parcel. The citation above points at the governing code section; check it, or ask the city to confirm.