139 ADU builders filed 297 ADU permits on homes in the City & County of Honolulu (Oʻahu) from July 2022 to June 2025; 87 filed one in the last 12 months on file. The middle filed job value was $150,000. The most active in the last 12 months on file were FU Long Construction Inc (12 permits), Pro Build Hawaii Construction (11) and Atlas Construction Inc (6); busy is not the same as careful. Side by side: permits filed, share finished and permits in the last 12 months on file for each firm. Pick what you value and the list re-orders.
Get references and proof of insurance before you sign.
Top 5 by ADU permits filed in the last 12 months on file, Jul 2024–Jun 2025. This is volume, not quality: a busy firm is not necessarily a careful one.
The 8 ZIP codes with the most ADU permits on homes from July 2022 to June 2025. Each opens permits by trade and the most active firms there.
96734 (41) 96816 (30) 96822 (25) 96701 (21) 96744 (21) 96706 (18) 96817 (17) 96782 (16)
Before you move a slider, the list is in a default order built only from the permit record: how much of each firm’s record is this kind of job (weight 30), how often its permits reached completion (25), how many permits it filed in the last 12 months on file (15) and how quickly its permits closed (10). Each measure is ranked against the other 139 firms and pulled toward the middle when a record is short.
The order comes from the Honolulu permit file, not from reviews: 87 of 139 ADU builders filed a permit in the last 12 months on file and 91% of their permits a year or more old were finished. Nobody pays to be listed or to move up, and there are no star ratings or reviews. The sliders and presets change the weights, and the order changes with them. How the records work in Honolulu.
We do not rate contractors. In this page’s default order, which uses only the permit record through Jun 2025, the top 3 are FU Long Construction Inc (15 permits), Pro Build Hawaii Construction (13 permits) and Atlas Construction Inc (7 permits). By permits filed alone, the most active is Vertical Construction with 21.
139 firms are on the list; the busiest filed 12 ADU permits in the last 12 months on file and the middle firm filed 1 in the whole file. Line them up on the same public measures: permits filed, share of permits finished and usual filed job value. Pick what matters to you and the list re-orders, for example recent activity if you need someone soon. The order comes from the permit record only, and nobody pays to be listed or to move up.
139 firms filed at least one ADU permit on homes in the City & County of Honolulu (Oʻahu) from July 2022 to June 2025; 87 of them filed one in the last 12 months on file.
We have not matched license records to Honolulu firms, so ask for the license number and check it yourself with Hawaii DCCA license search. How to check a contractor's license in Hawaii →
Three you can check against this page: “How many ADU permits have you filed in Honolulu?” (the middle firm here filed 1; 87 of 139 filed one in the last 12 months on file); “What value will you put on the permit?” (the usual filed value here is $150,000); “Will you pull the permit in your company’s name, and when is the final inspection?” (91% of older ADU permits here were finished). All 10 questions and how to check each →
On this page: 139 firms filed 297 ADU permits from July 2022 to June 2025, and each firm’s name opens its own permit record. Every number comes from City & County of Honolulu building permits (DPP). To see one permit itself, search the address or permit number with the Honolulu permit office. How the records work in Honolulu →
We do not rate or collect reviews. Instead each of the 139 ADU builders here is shown with its permit record: 297 permits, the share finished and usual filed value. Read reviews on other sites and use this page to check them against the record. Reviews vs permit records →
Every number on this page comes from City & County of Honolulu building permits (DPP) (the City's public permit file ends June 30, 2025): 139 firms filed 297 ADU permits on homes in the City & County of Honolulu (Oʻahu) from July 2022 to June 2025, and 87 of them filed one in the last 12 months on file. The middle firm has 1 permit in the whole file. A short record leaves more uncertainty, and some jobs never require a permit.
The middle recorded permit value is $150,000. That is a filed estimate, not a quote or final bill. See how we compare records.
Most Honolulu ADU permits are filed in April (184 against an average month of 100); July is the quietest (58). When each trade is busiest in Honolulu →