Development Standards

Zoning calculator

Enter your parcel and project details to check lot coverage, setback envelope, height, and FAR against the Honolulu LUO (ROH Chapter 21). No AI, no API call — instant results.

Covers R-3.5 through R-20, A-1, A-2, AG-1, and B-1 districts. Verify all figures against the current adopted ROH before relying on them. Overlay districts, SMA, and flood zone rules may impose additional requirements not reflected here.

Parcel information

Zoning district *

Lot area (sq ft) *

Lot width (ft) — optional, enables envelope

Lot depth (ft) — optional

Corner lot — applies street-side setback of 10 ft to one side

Structures

Existing covered structures (sq ft) *All existing footprints including house, garage, accessory structures, covered lanais

Proposed addition footprint (sq ft) *Footprint of new covered structure. Use 0 if no new coverage is proposed.

Height and floor area

Optional — leave blank to skip those checks.

Proposed maximum height (ft)Measured from grade to highest point of roof

Total proposed floor area (sq ft)All floors combined. Required for FAR check (R-5 has no FAR cap).

R-5 quick reference

Front yard

10 ft min

Rear yard

5 ft min

Interior side

5 ft min

Street side

10 ft min

Max coverage

50%

Max height

30 ft

Min lot

5,000 sf

FAR limit

None

Lot coverage

The total footprint of all covered structures divided by lot area. Roofed areas — including attached covered lanais and overhangs beyond 18 inches — count.

Setback envelope

Enter lot dimensions to see your true buildable rectangle after front, rear, and side yard deductions. Corner lot? Check the box to apply the street-side setback.

FAR

Floor area ratio = total floor area ÷ lot area. Most Honolulu residential districts have no FAR cap, but A-1 (1.25) and A-2 (1.75) do.