KILO.LAND

Oʻahu · residential ADU pilot

Before you draw the extra home.

Understand the published ADU limits and the questions your property needs answered before design.

Get a cited pre-design report covering size, base zoning setbacks, water and wastewater checks, and use and ownership restrictions.

$50 for one parcel assessment. Includes this ADU view and the full KILO parcel read. Existing assessment access applies.

Automated preliminary screening, with no individual professional review. It does not establish eligibility, available building area or permit approval.

See an illustrative report ↓

A focused first step

For an existing single-family home in Honolulu’s R-3.5, R-5, R-7.5, R-10 or R-20 districts. Hawaiian Home Lands parcels are outside this pilot. We check mapped coverage after sign-in and before an assessment can use a credit.

ʻOhana units follow a separate pathway. The state’s two-ADU requirement is not a promise that your lot can add two units.

Start with your property

Start typing and choose a matching street address, or enter a TMK directly. Check the parcel against your tax record; a CPR unit may share a larger zoning lot.

Your project

Your answers guide the report; they are not verified against permits or title records. Answers are carried in your report URL.

Sign-in comes next. Existing KILO assessment access applies; new purchases go through checkout.

What you receive · rule review 2026-10-30

KILO · Oʻahu ADU pilot

An example of your ADU report

Illustrative example only — not an assessment of a real property.

Preliminary screening from public records and your answers. No site visit or individual professional review. This report does not establish ADU eligibility or permit approval.

Data coverage · not reported

Data coverage was not reported for this read. Treat the infrastructure and site findings as unverified until a new assessment confirms coverage.

01 · Start here

Resolve these questions before design

Published zoning limits are a starting point. Existing buildings, zoning-lot boundaries, access, private restrictions and agency capacity checks remain unresolved.

  • CPR, HOA, or deed restrictions need document review. KILO has not searched the title or private covenants.

02 · Size and siting

1,000 sq ft ordinance ceiling

Mapped tax-parcel area: 6,000 sq ft. This ceiling assumes that area is the zoning lot. It is not available floor area or proof that a unit fits. A CPR unit’s address or tax parcel may not represent the whole zoning lot.

Front yard · base district
10 ft
Side yard · base district
5 ft
Rear yard · base district
5 ft
Lot coverage · base district
50 %

ROH Table 21-3.2 · verify project-specific requirements. These are base standards, not a drawn building envelope. Existing coverage, height, floor area, easements and overlays can change the applicable yards; R-3.5 side/rear yards can increase with proposed floor area.

Ask the designer to confirm ADU parking requirements and any transit exemption under ROH §21-6.30(b). This pilot does not measure parking eligibility or remaining buildable area.

ROH §21-5.50-3(a) · ADU standards ↗

03 · Infrastructure and site

The checks that still matter

Water supply · Not verified

DPP layer not available — agency pre-check needed. BWS must confirm service and capacity for the proposed additional demand. A service-area designation is not a new-meter commitment.

Wastewater · Not verified

A mapped system or nearby sewer does not establish capacity for another dwelling. Confirm with DPP Wastewater or DOH.

Flood · Not verified

Confirm flood-zone boundaries, elevation and building requirements with the designer and DPP.

SMA · Not verified

Confirm whether the proposed work needs coastal review; the mapped designation is a screening input.

Shoreline · Not verified

A certified shoreline and project-specific setbacks may be needed before siting a unit.

These findings come from the same KILO parcel assessment. “Not verified” and a silent public record are gaps, not permission. Cultural-resource and HRS §6E review remain part of the full parcel assessment and agency process; this focused ADU report does not resolve them.

04 · Use and ownership

An ADU and an ʻohana unit are different pathways

The cited Honolulu rule permits one ADU per zoning lot, with an otherwise permitted ʻohana unit treated separately. Do not assume that an ʻohana classification establishes ADU eligibility.

An ADU requires a recorded covenant for long-term residential occupancy. It cannot be used as a bed-and-breakfast or transient vacation unit, or separated from its principal dwelling’s ownership through a CPR. Existing private restrictions and title documents have not been reviewed.

ROH §21-5.50-3(a) · ADU standards ↗

HRS §46-4.8 sets a December 31, 2026 county implementation deadline for at least two ADUs or a reasonable equivalent, with alternative compliance paths and exceptions. It does not establish a two-ADU entitlement on this parcel. Confirm the rules in force when applying.

HRS §46-4.8 · State ADU requirements ↗

05 · Your project assumptions

Supplied by you · not verified against records

What is on the property?
One single-family home
Does the zoning lot already have an ADU?
No known ADU
What are you considering?
A new attached or detached ADU
How would the unit be used?
Long-term rental
Any known CPR, HOA, or deed restrictions?
I’m not sure

06 · Take this to the next conversation

Your next conversations

Ordered from your project answers. The sequence is a preparation aid; agencies and your project team must confirm the applicable pathway and requirements.

  1. DPP zoning

    Confirm the zoning lot, lawful dwelling count and the ADU pathway for this proposal. Confirm any planned-development, cluster-housing or landlocked-lot exclusion.

    Bring: TMK, a boundary survey if available, and records for every existing dwelling or extra unit.

    Why this step: Your answers are assumptions; an address and tax parcel do not establish the zoning lot or permitted dwelling count.

    ROH §21-5.50-3(a) · ADU standards ↗

  2. Owner and title professional

    Review CPR documents, HOA rules, recorded covenants and required owner consents.

    Bring: The recorded title, CPR declaration, association rules and any recorded ADU covenant.

    Why this step: You reported restrictions or uncertainty about them; resolve those documents before design commitments.

    ROH §21-5.50-3(a) · ADU standards ↗

  3. BWS and DPP Wastewater / DOH

    Request the applicable public-facilities pre-check for the additional dwelling and demand.

    Bring: TMK, existing service and wastewater records, proposed dwelling count, size and use.

    Why this step: Mapped service or system presence does not establish available capacity. Include access and first-response requirements in the agency discussion.

    Honolulu DPP · confirm parcel and project requirements ↗

  4. Your designer

    Check a proposed layout against yards, coverage, height, parking, easements and overlays.

    Bring: Boundary/topographic survey, existing plans, the proposed footprint and this report.

    Why this step: The reported size ceiling and base yards are not a measured building envelope. Confirm flood and coastal requirements for the actual work.

    ROH §21-5.50-3(a) · ADU standards ↗

ADU rule review: 2026-10-30. Public records can be incomplete or out of date. No construction estimate, rental return, survey, title clearance or permit approval is provided.